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Printed in Canada

Printed on 100% recycled paper

2021-11-02

X40239 Rev. D

Models:

OFEAxx000-VV

OFEAxx000-1HVV

ADVANTAGE

(ECM MOTOR)

Caution: Donot tamper with

the unit or its controls. Call a

qualified service technician.

INSTALLER / SERVICE TECHNICIAN:

USE THE INFORMATION IN THIS MANUAL FOR THE INSTALLATION AND

SERVICING OF THE FURNACE AND KEEPTHE DOCUMENTNEAR THE UNIT

FOR FUTURE REFERENCE.

HOMEOWNER:

PLEASE KEEP THIS MANUAL NEAR THE FURNACE FOR FUTURE

REFERENCE.

Manufactured by :

Industries Dettson inc.

Sherbrooke, Québec - Canada

www.dettson.ca

www.ouellet.com 1 800 463-7043

2 
 
TABLEOFCONTENT 
1- SAFETY..................................................................3 
1.1- DANGER, WARNING AND CAUTION............... 3 
1.2- IMPORTANT INFORMATION............................ 3 
1.3- DANGER OF FREEZING .................................. 3 
2- INSTALLATION.....................................................3 
2.1- POSITIONING THE FURNACE ......................... 4 
2.2- CLEARANCES TO COMBUSTIBLE MATERIAL 4 
2.2.1- Heating unit..........................................................................4
2.2.2- Supply air ducts..................................................................4
2.3- CONFIGURATIONS ......................................... 4 
2.3.1- Upflow installation .............................................................4
2.3.2- Downflow installation........................................................4
2.3.3- Horizontal installation .......................................................4
2.4- ELECTRICAL SYSTEM .................................... 4 
2.4.1- Conversion from two to one supply wires for model 
over 27kW..............................................................................................5
2.5- INSTALLATION OF THE THERMOSTAT .......... 5 
2.5.1- Anticipator adjustment(if required) on thermostat 
equipped with heat anticipator adjustment .................................6 
2.5.2- Air ducts................................................................................6
2.6- SUPPLY AIR ADJUSTMENTS .......................... 6 
2.6.1- HEAT KW/CFM adjustment..............................................6
2.6.2- AC/HP size............................................................................7
2.6.3- System type .........................................................................7
2.6.4- AC/HP CFM adjust..............................................................7
2.6.5- ON/OFF delay.......................................................................7
2.6.6- Continuous fan....................................................................7
2.6.7- Low-voltage circuit.............................................................7
2.6.8- Basic furnace configuration............................................7
2.7- INSTALLATION OF ACCESSORIES................. 8 
2.7.1- Humidifier and humidistat connection .........................8
2.7.2- Electronic Air Cleaner (EAC) connections ..................8
2.7.3- Dehumidify capability with standard humidistat 
connection ............................................................................................8
2.7.4- Use of a heat pump............................................................8
3- OPERATION..........................................................8 
3.1- START-UP ....................................................... 8 
3.2- USE OF MANUAL FURNACE CONTROLS ON 
ADVANTAGE FURNACE ....................................... 8 
3.3- OPERATING SEQUENCE ................................ 9 
3.3.1- Continuous fan....................................................................9
3.3.2- Cooling mode –single stage...........................................9
3.3.3- Cooling mode –two stage ...............................................9
3.3.4- Cooling mode –dehumidification..................................9
3.3.5- Electric heating mode –1 stage .....................................9
3.3.6- Electric heating mode –2 stage.....................................9 
3.3.7- Heat pump heating mode –single stage.....................9 
3.3.8- Heat pump heating mode –two stage..........................9 
3.4- AIRFLOW VERIFICATION...............................10 
3.4.1- Supply Air Temperature Rise Test..............................10 
3.4.2- High limit verification......................................................10 
4- MAINTENANCE..................................................10 
4.1- AIR FILTER ....................................................10 
4.2- MOTOR LUBRICATION ..................................10 
5- FURNACE INFORMATION...............................11 
 
TABLES 
Table 1: Sequence of operation.....................................12 
Table 2: Technical specifications...................................13 
Table 3: Airflowtables UNIQUE Advantage ECM ½ HP 
motor ............................................................................14 
Table 4: Airflowtables UNIQUE Advantage ECM 1 HP 
motor ............................................................................15 
Table 5: Parts list, UNIQUE Advantage ECM ..................19 
 
FIGURES 
Figure 1: Upflow installation ............................................4 
Figure 2: Downflow installation........................................4 
Figure 3: Horizontal installation .......................................4 
Figure 4 : Conversion from two to one supply wires.........5 
Figure 5: 1-stage thermostat, electric heating only ..........5 
Figure 6: 2-stage thermostat, electric heating only ..........5 
Figure 7: 1-stage thermostat, electricheat and cooling 
application.......................................................................5 
Figure 8: 2-stage heating & 1-stage air conditioning & 
heat pump thermostat .....................................................6 
Figure 9: 2-stage heating & 2-stage air conditioning & 
heat pump thermostat + dehumidification mode ..............6 
Figure 10 : Fan Control Board.........................................6 
Figure 11 : Standard humidistat connections...................8 
Figure 12 : Thermostat connections................................8 
Figure 13 : Electronic air cleaner connections.................8 
Figure 14 : Advantage furnace controls...........................9 
Figure 15 : Furnace dimensions....................................16 
Figure 16 : Electrical diagram UNIQUE Advantage ECM.17 
Figure 17: Parts list, UNIQUE Advantage ECM ...............18 
 

1-SAFETY

1.1- DANGER, WARNING AND CAUTION

The wordsDANGER, WARNING andCAUTION are used to

identifythe levelsof seriousnessof certainhazards.It is

importantthat you understandtheir meaning.You willnotice

these wordsin the manual asfollows:

DANGER

Immediate hazards which WILL result in death or serious

bodily and/or materialdamage.

WARNING

Hazardsor unsafe practices which CAN result in death or

serious bodily and /or materialdamage.

CAUTION

Hazardsor unsafe practices which CAN result in minor

bodily and /or materialdamage.

1.2- IMPORTANT INFORMATION

WARNING

Non-observance of the safety regulations outlined in this

manual will potentially lead to consequences resulting in

death, serious bodily injury and/or property damage.

WARNING

Installation and repairs performed by unqualified persons

can result in hazards to them and to others. Installations

must conform to local codes or, in the absence of such

codes, to codes of the country having jurisdiction.

The information contained in this manual is intended for

use by a qualified technician, familiar with safety

procedures and who is equipped with the proper tools and

test instruments.

Failure to carefully read and follow all instructions in this

manual can result in death, bodily injury and/or property

damage.

a. It is the homeowner’s responsibility to engage a

qualified technician for the installation and subsequent

servicing of this furnace;

b. Do not use this furnace if anypartof it wasunder water.

Call a qualified service technician immediately to

assessthe damage and to replace all critical parts that

were in contact with water;

c. Do not store gasoline or any other flammable

substances, such as paper or carton near the furnace;

d. Never block or otherwise obstruct the filter and/or

return air openings;

e. Ask the technician installing your furnace to show and

explain to you the following items:

i. The main disconnect switchor circuit breaker;

ii. The air filter and how to change it (check monthly

and clean or replace if necessary);

f. Before calling for service, be sure to have the

information of section 5 of your manual close by in

order to be able to provide the contractor with the

required information, such as the model and serial

numbers of the furnace.

IMPORTANT: All local and national code requirements

governing the installation of central electric heatingequipment,

wiring andthe flue connectionMUSTbe followed. Some of the

codesthat mayapplyare:

ANSI/NFPA 70: NationalElectricalCode

CSA C22.1 or CSA C22.10: CanadianElectricalCode

Only the latest issuesof thesecodes maybe used,and are

availablefrom either:

The NationalFire Protection Agency

1 BatterymarchPark

Quincy, MA 02269

The Canadian StandardsAssociation

178Rexdale Blvd.

Rexdale, Ontario M9W 1R3

1.3- DANGER OF FREEZING

CAUTION

If your furnace is shut down during the cold weather

season, water pipes may freeze, burst and cause serious

water damage. Turn off the water supply and bleed the

pipes.

If the heater is left unattended duringthe cold weather season,

take the followingprecautions:

a. Close the main water valve in the house and purge the

pipesif possible. Open allthe faucetsinthe house;

b. Ask someone tofrequentlycheckthehouseduringthecold

weatherseason to makesure that there issufficientheatto

prevent the pipes from freezing. Tell this person to call an

emergencynumberif required.

2-INSTALLATION

This furnaceis a true multi-positionunit,inthat it willfunctionin

an upflow,downflow orhorizontal configuration to theleft or the

right. Only a few modifications are required during installation

to change from one position to another. The unit is shipped in

the upflowconfiguration andinstructionsastohowto changeto

the other positionsareincludedinthis manual.

The unit requires a 240 - 208 VAC power supply to the control

panel,thermostathook-upas shown on the wiringdiagram.

2.1- POSITIONING THE FURNACE

WARNING

Fire and explosion hazard.

The furnace must be installed in a level position, never

where it will slope toward the front.

Do not store or use gasoline or any other flammable

substancesnear the furnace.

Non-observance of theseinstructions will potentially result

in death, bodily injury and/or property damage.

CAUTION

This furnace is not watertight and is not designed for

outdoor installation. It must be installed in such a manner

as to protect its electricalcomponents fromwater. Outdoor

installation will lead to a hazardous electricalcondition and

to premature failure of the equipment.

If the furnace is installed in a basement or on a dirt floor, in a

crawl spaceforexample,itisrecommendedtoinstalltheuniton

a cement base 2.5 cm to 5.0 cm (1’’ to 2’’) thick.

In addition,theheatershouldalsobelocatedcloseto thecenter

of the air distribution system.

2.2- CLEARANCES TO COMBUSTIBLE MATERIAL

2.2.1- Heating unit

The furnace is approved for zero clearance to combustible

material regardlessof the heating capacity.

2.2.2- Supply air ducts

Ducts can be installed with a zero clearance to combustible

material.

2.3- CONFIGURATIONS

This furnacerequiressuitable ductwork.

2.3.1- Upflow installation

The return duct may be installed to the back, to the bottom, on

the leftside,oronthe rightsideof the unit.The supplyductshall

be installed on the top of the unit. Care should be taken not to

damage the wires inside while cutting the opening. It is also

recommended to install the blower door before handling or

moving theunit. Refer to

Figure 1: Upflow installation

2.3.2- Downflow installation

The returnduct maybe installedtothe back, on the left side,on

the right side orunderthe unit.The supplyductshall beinstalled

on the top of the unit.

The downflow base OFE-SO2 can be used. Refer to Figure 2

andthe installationinstructionsprovidedwiththe base.

Figure 2: Downflow installation

2.3.3- Horizontal installation

The return duct maybe installed tothe back, on the left side,on

the right side orunderthe unit.The supplyductshall beinstalled

on the top of the unit.

The furnace can be installed in the horizontal position, either

suspended orona combustible floorwithachoiceof rightor left

discharge. Refer to Figure 3 for additionaldetails.

Figure 3: Horizontal installation

2.4- ELECTRICAL SYSTEM

The UNIQUE furnace is completely pre-wired and all fieldwiring

mustbe connected to theterminal blocks on the unit. It requires

240- 208 voltage.

OFE-SO2

WARNING

Risk of fire.

The conductor sizing must conform to the lastedition of the

local or national codes.

Failure to follow this rule can result in death, bodily injury

and/or property damage.

Powersupplyto the unitcan be doneusingcopperor aluminum

wires. The wire size must be decided in accordance to the unit

power consumption, the over current protection type and

capacity, the wire type and length, and the environment where

the unit is installed. If an aluminum wire is used, other

precautions must be taken to insure the conformity of the

installation.In allcases, all the factors affectingthe wire gauge

mustbe consideredandthe installationcodesfollowed.

The exterior of the unit must have an uninterrupted ground to

minimizetherisk of bodilyharm. A groundterminalis supplied

with the control boxforthat purpose.A connectorissuppliedon

the groundterminaltoground an addedaccessory.

In the event that wiresinsidethe unitrequire replacement,these

must be copper wires only with same temperature rating and

sizes as originals.

The models of 27 kWand more are pre-wired in factory with two

terminal blocksallowing the usage of two smallergauge wires.

2.4.1- Conversion from two to one supply wires for

model over 27 kW

WARNING

Risk of fire.

When using one terminal block on models over 27 kW, the

installation must be performed with copper wire ONLY in

order to comply with the Canadian electrical code. The

usage of an aluminum or copper wire is acceptable on

models 25 kW and lower.

Move all wires from the two pole terminal to the three pole

terminal followingthe corresponding colors as shown in Figure

The breakerand the supplyconductorsmustbe sizedbyadding

the ampacitiesof the two terminalsindicatedonthenameplate.

Refer to the electricaldiagram (Figure16).

. Figure 4 : Conversion from two to one supply wires

Before After

2.5- INSTALLATION OF THE THERMOSTAT

A thermostat mustbe installedto controlthe temperatureof the

area to be heated. Follow the instructions supplied with the

thermostat. Some thermostats need to connect the C terminal

on the furnace and thermostat. Install the thermostat on an

interior wall in a location where it will not be subject to direct

sunlight, lamps, air diffusers, fireplaces, etc. Seal openings in

wallstoavoid aircurrentsthat mayinfluence the operationof the

thermostat.Also refer to the wiring diagrams providedwith the

heating/airconditioning unit.The connectionsmustbemadeas

indicatedon Figure 5to Figure 9. Referto the electricaldiagram

(Figure 16).

Figure 5: 1-stage thermostat, electric heating only

Figure 6: 2-stage thermostat, electric heating only

Figure 7: 1-stagethermostat, electric heat and cooling

application

Figure 8: 2-stageheating & 1-stage air conditioning & heat

pump thermostat

Figure 9: 2-stageheating & 2-stage air conditioning & heat

pump thermostat+ dehumidification mode

2.5.1- Anticipator adjustment(if required) on thermostat

equipped with heat anticipator adjustment

Somethermostatsareequippedwithaheatanticipatorthatmust

be adjusted according to the instructions supplied. This is to

ensure that the heating mode is comfortable andeconomical.

Generally speaking, on a single stage thermostat,a reading of

the current mustbe takenwith an ammeterasfollows:

1. Move the anticipator to its highest setting, rendering it

ineffective.

2. Remove the wire from the W1 terminal and connect an

ammeterbetween theterminalandthewire.

3. Call for heat by raising the set point on the thermostat and

allowthe furnaceto run for 3 to 4 minutesto reachits peak

output.

4. Once the currenthas stabilized,a readingshouldbetaken

andthe anticipatoradjustedto that value. If longerheating

cycles are desired, the anticipator can be set to a higher

value

2.5.2- Air ducts

The ducts must be sized such a way as to accommodate the

specifiedairflowandtheavailablestatic pressure. Refer to the

applicablelocaland/ornationalinstallationcodes.

Insulate the ducts that lead through non-heated areas. Use

flexible supply and return air connectors to avoid the

transmissionof vibration. Tomakethe unitrun even quieter,the

installershould:

a. Use two elbows between each outlet and the supply and

return airplenum;

b. Coverthe vertical sectionsof the supplyand returnair duct

with soundproofingmaterial;

c. Use bafflesinshortradiuselbows;

d. Use flexiblehangerstosuspendtheducts.

A heat pumpor anair conditionercanbe added to this furnace,

in either the supply or return air duct. Carefully follow the

instructions provided with these appliances to ensure proper

installationandhook-uptothe electricfurnace. Refrigerantand

drainage pipes must in no way hinder access to the furnace

panels.

2.6- SUPPLY AIR ADJUSTMENTS

Fan Control Board taps are used by the installer to configure a

system. The ECM motor uses the selected taps to modify its

operationto a pre-programmedtableof airflows(Referto Table

3 and Table 4). Airflows are based on system size or mode of

operation and those airflows are modified in response to

thermostatinputssuch as dehumidificationrequest.

The UNIQUE furnace mustbeconfiguredtooperateproperlywith

system components with which it is installed. To successfully

configure a system (see information printed on circuit board

label located next to select pins), move the 6 select wires to the

pins which match the components used. (Refer to Figure 10

below)

Figure 10 : Fan Control Board

2.6.1- HEAT KW/CFM adjustment

Installer must verify (factory set) the electric heat airflow

adjustmentrequiredforkWsize heater installed.

The selectpinsare marked25,23/20,18/15, 10 (for½ HP ECM

motorunit) and 30/27, 25, 23, 20, (for 1.0 HP ECM motorunit).

Refer to the unit wiring diagram and select the pin for the kW

size heaterbeing used(Refer to Figure 10and Figure 16).

The airflow must be large enough for safe and continuous

operation.(Referto Table3 and 4 for airflowdeliveryCFM).

2.6.2- AC/HP size

Select System Size Installed

The factory setting for air conditioner or heat pump size is the

largest outdoorunit that can be used with the furnace. Installer

needsto select airconditioneror heat pump size to ensure that

airflow delivered falls within proper range for the size unit

installed.

The select pinsare marked 3, 2 ½, 2, 1 ½ for furnaceequipped

with½ HP ECMmotorand 5,4, 3 ½, 3 forfurnace equippedwith

1.0 HP ECM motor. Refer to the unit wiring diagram andselect

the pin for the outdoorunit size being used(Refer to Figure 10

andFigure 16).

2.6.3- System type

Select System Type Installed AC or HP

The type of system mustbe selected:

1. AC –Air Conditionerprovidesapproximately400 CFM per

ton for greater efficiency and humidity control with the

AC/HP CFM ADJUST set to the nominal (NOM) tap. To

achieve more or less than 400 CFM per ton, move tap to

(HI) or (LO) position respectively. Refer to appropriate

airflow tablesforexact CFM setting.

2. HP-COMFORT –Heat Pump Comfort provides

approximately 350 CFM per ton for higher than normal

heatingairdeliverytemperature.

3. HP-EFF –Heat Pump Efficiency provides same airflow for

heating and cooling modes to increase overall HP

efficiency;approximately400CFM per ton with the AC/HP

CFM ADJUST set to the nominal (NOM)tap.

The factorysetting is AC (Refer to Figure 10and Figure 16).

2.6.4- AC/HP CFM adjust

Select Medium, Low, or High Airflow

To provideairflowatratesdescribedabove,theAC/HPADJUST

select is factory set to the nominal (NOM) tap. The adjust

selectionsHI/LO will regulateairflow supplied forall operational

modes.

HI provides10% airflow overnominal unitsize selected and LO

provides10%airflowbelownominal unitsizeselected.

Setting options are provided to adjust airflow supplied to meet

individual installation needs for such things as noise, comfort,

andhumidityremoval. (Referto Figure 10and Figure 16)

2.6.5- ON/OFF delay

Select desired time delay profile

NOTE: Delay selections are active in cooling and heat pump

heating modes only. Electric heating modes have a one (1)

minute OFF delay at 50% airflow and zero (0) ON delay

programmed intotheECM motorthat cannotbe overridden.

Four (4) motor operation delay profiles are provided to

customize and enhance system operation. (Refer to Figure 10

andFigure 16).

Selectionoptionsare:

1. 0/90: No ON delay and 90 second OFF delay at 100%

airflow (factorysetting).

2. 30/90: 30 second ON delay with no airflowand 90 second

OFF delayat100%airflowprofile. Usedwhenitisdesirable

to allow system coils time to heat-up/cool-down in

conjunctionwiththe airflow.

3. 0/0: No delay option. Used for servicing unit or when a

thermostatis utilized to perform delayfunctions.

4. ENH: enhanced selection provides a 30 second ON delay

withno airflowfollowedby150secondsat70%airflow,and

no OFF delayfor addedcomfort. This profilewillminimize

cold blow in heat pump operation and could enhance

system efficiency.

2.6.6- Continuous fan

NOTE: If installed with atwo-stage outdoorunit,do notselect HI

speedcontinuousfan. If HI is selected,low stage compression

will also run HI fan speed possibly resulting in insufficient

dehumidification.

Select desired fan speed when thermostat is set on

continuous fan. (Refer to Figure 10 and Figure 16)

1. LO speed –factorysetting, 50% cooling mode airflow.

2. MED speed –moveconnectorto MED, 80% coolingmode

airflow.

3. HI speed –move connector to HI, 100% cooling mode

airflow.

2.6.7- Low-voltage circuit

Fusing and Reference

The low-voltage circuit is fused by a board-mounted 5-amp

automotive fuseplaced inserieswiththetransformerSEC2and

the R circuit. The C circuit of the transformer is referenced to

chassisgroundthrougha printedcircuit run at SEC1connected

to metal standoff markedwithground symbol.

2.6.8- Basicfurnace configuration

The following basic configuration of the furnace will provide ARI

rated performance of an airconditioner:

1. HEAT KW/CFM –Select the heater range for the size

electricheater installed.

2. AC/HP SIZE –Selectsystem sizeinstalled.

3. SYSTEM TYPE –Select system type AC

4. AC/HP CFM ADJUST –Select NOM.

5. ON/OFF DELAY –Select0/90 profile.

6. CONTINUOUS FAN –Select desired fan speed when

thermostatis set to continuousfan.

The following basicconfiguration of the furnace willprovide ARI

rated performance of a heatpump:

1. HEAT KW/CFM –Select the heater range for the size

electricheater installed.

2. AC/HP SIZE –Selectsystem sizeinstalled.

3. SYSTEM TYPE –Select system type HP-EFF

4. AC/HP CFM ADJUST –Select NOM.

5. ON/OFF DELAY –Select0/90 profile.

6. CONTINUOUS FAN –Select desired fan speed when

thermostatis set to continuousfan.

2.7- INSTALLATION OF ACCESSORIES

WARNING

Electrical shock hazard.

Turn OFF electrical power at the fuse box or service panel

before making any electrical connection and ensure that a

proper ground connection is made before connecting line

voltage.

Failure to do so can result in death or bodily injury.

2.7.1- Humidifier and humidistat connection

Fan Control Board terminals HUM1 (directly connected

internallyto C on terminal block)andHUM2(directlyconnected

internally to G on terminal block) are provided for direct

connectionsto the low-voltagecontrolof a humidifierthrougha

standardhumidistat(refertoFigure 11).

Figure 11 : Standard humidistat connections

These terminalsare energizedwith24VAC whenG thermostat

signalispresent. Alternately,the24 VAC signal maybesourced

from the W1 and C terminal block connections when electric

heaters are used as a primary heating source (refer to Figure

12).

Figure 12 : Thermostat connections

2.7.2- Electronic Air Cleaner (EAC) connections

FanControlBoard terminalsAUX1(directlyconnectedinternally

to C on terminalblock)and AUX2 (directlyconnected internally

to G onterminal block)are providedfordirectconnectionsto the

low-voltagecontrol of an electronicaircleaner.These terminals

are energizedwith24VAC whenG thermostatsignalis present

(referto Figure 13)

Figure 13 : Electronic air cleaner connections

2.7.3- Dehumidify capability with standard humidistat

connection

Latent capacities for systems using this unit are better than

average systems. If increased latent capacity is an application

requirement, the field wiring terminal block provides a

connection terminal (DH) foruse of a standard humidistat. The

furnace control will detect the humidistat contact opening on

increasing humidityandreduceitsairflowtoapproximately80%

of nominal cooling modeairflow. Thisreduction will increase the

system latent capacity until the humidity falls to a level which

causesthe humidistatcontactto close its contacts.

When the contact closes again, the airflows comes back to

100% of the coolingairflow selected.

2.7.4- Useof a heat pump

When using a heat pump, a thermostat with dual fuel option or

a fossil fuel kit is required that prevents the operation of the

electricelementsand the heat pumpatthe sametime. Refer to

the instructions provided with the thermostat or the “Fossil Fuel”

kit for the properwiringof the furnaceand the heatpump.

The simultaneous operation of the electric elements and the

heat pump will cause overheating of either unit. The safety

controls of the appliances will shut down the elements or heat

pump,sincethey are not designedtofunctioninthis fashion.

3-OPERATION

3.1- START-UP

Before starting up the unit, be sure to check that the following

itemsare in compliance:

1. The electricalinstallationandventilation are conform;

2. The blower access door is in place and the blower rail

lockingscrewsare well tightened;

3. The blower speed adjustments for heating and air

conditioning are appropriate and according to the

specificationsin thismanual;

4. The thermostat of the room is in heating mode and is set

higherthan the ambienttemperature.

5. The breakerson frontpanelare set on the “ON” position

To start the unit,turn the main electricalswitchon.

3.2- USE OF MANUAL FURNACE CONTROLS ON

ADVANTAGE FURNACE

When thereis a demand forheat,the pilotlight(L-1) comeson.

Refer to the wiringdiagram (Figure16).

When the “HI/LO” switch is put into the “LO” position, it will shut

down approximatelyhalf the elements.

However, it is important to put the switch back to the “HI”

position during the winter months to ensure adequate

heating.

Also, this switch must remain in the “HI” position when a 2-stage

or outdoorthermostatis used to control the electricelementsof

the secondstage. Refer to the diagram inSection 2.5-.

The “ON/OFF VENT/FAN” switch engages the blower in the

continuous low speed mode. This will filter the air and provide

forbetter air distributioninthe building.

The 15 A circuit breaker is there to protect the motor and the

controlcircuitconductors. If theunitdoesnot function,pressthe

DNS-1154 Rev. A

circuit breakerbutton to see if it may have disengaged due to a

power surge. If the breaker has to be pressed again, the unit

mustbe checked by a qualified servicetechnician.

Figure 14 : Advantage furnace controls

3.3- OPERATING SEQUENCE

This unit is designed to provide the required airflow in order to

match with any of four (4) different electronic heat capacity, air

conditionerorheatpump outdoorunitsizes(see Tables3 and 4

forCFM values).

Also, the blowermotoris a true variablespeedmotor designed

to deliverconstantCFM. ConstantCFMisvalidforsystemswith

total external static pressurebetween 0.1 and0.8 incheswater

column.

Refer also to Table 1 for sequence of operation summary,

dependingonthermostatinputsandtypes.

3.3.1- Continuous fan

•Thermostatclosescircuit R to G.

Blowerruns at continuousfan airflow.

3.3.2- Cooling mode –single stage

NOTE: For single stage systems, do not use the Y1 terminal.

•If indoor temperature is above temperature set point and

humidity is below humidity set point, thermostat closes

circuits R to G, R to Y/Y2 andR to O.

Furnace deliverssinglestagecoolingairflow.

3.3.3- Cooling mode –two stage

•First stage(low)cooling:Thermostatcloses circuits Rto G,

R to O, and R to Y1.

Furnace deliverslowstage coolingairflow.

•Second stage (high) cooling: Thermostat closes circuits R

to G, R to O, R to Y1 andR to Y/Y2.

Furnace delivershighstage coolingairflow.

3.3.4- Cooling mode –dehumidification

NOTE: Removejumper« J1» on board toactivate thisfunction.

(Refer to Figure 10 andFigure 16)

•If indoor temperature is above temperature set point and

humidity is above humidity set point, thermostat closes

circuits R to G, R to Y/Y2 and R to O and humidistatopens

circuit R to DH.

The furnacedeliversairflow whichisapproximately80%of

the nominal coolingairflowtoincrease the latentcapacityof

the system.

3.3.5- Electric heating mode –1 stage

•Thermostatclosescircuit R to W1 or W2.

Furnace delivers the selected electric heat airflow and

maximum heatingcapacity is powered starting the heating

elements in sequence with a delay of 3 seconds between

each.

3.3.6- Electric heating mode –2 stage

NOTE: Removejumper« J2» on board toactivate thisfunction.

(Refer to Figures10 and16)

•First stageheating:thermostatcloses circuit R to W1.

Furnace deliverslow stage heating airflow (50% of nominal

electric heating airflow) and approximately half of the

heating capacity is powered starting the heating elements

in sequence witha delayof 3 secondsbetween each.

•Secondstage heating:thermostatclosescircuit R to W2.

Furnace delivers high stage heating airflow (100% of

nominal electric heating airflow) and maximum heating

capacity is powered starting the heating elements in

sequencewitha delayof 3 secondsbetweeneach.

3.3.7- Heatpump heating mode –single stage

NOTE: For single stagesystems, do not use the Y1 terminal.

•Thermostatclosescircuits R to G and R to Y/Y2.

Furnace deliversselected heat pump heatingairflow.

3.3.8- Heatpump heating mode –two stage

•First stage (low)heating:Thermostat closes circuits Rto G

andR to Y1.

Furnace deliverslowstage heatingairflow.

•Second stage (high)heating: Thermostatcloses R to G, R

to Y1 and R to Y/Y2.

Furnace delivershighstage heatingairflow.

WARNING

Electrical shock or unit damage hazard

Failure to carefully read and follow this WARNING could

result in equipment malfunction, property damage,

personal injury and/or death.

Disconnect power to unit before removing or replacing

connectorsor servicingmotor. Wait atleastfive (5)minutes

after disconnecting power before handling.

3.4- AIRFLOW VERIFICATION

Verifytheairflow bytaking readingsofthefollowingpoints,while

the elementsare in heating mode:

a. Total amperage of allthe heating elements;

b. Voltage at the furnace;

c. Supply air temperature. The point of the readingmust not

be affected byradiantheat from the elements;

d. Return air temperature.

From these readings, one can arrive at an approximate

calculation of the average airflow. To do that, the following

formulashouldbeused:

0.82 x amps.x volts

Liter/s= -------------------------

Diff. temperature ˚C

3.1 x amps.x volts

CFM = ------------------------

Diff. temperature ˚F

3.4.1- Supply Air TemperatureRise Test

1. Operatethe unit at maximumpowerforatleast10 minutes;

2. Measurethe air temperatureinthe returnair plenum;

3. Measurethe air temperatureinthe largesttrunk coming off

the supplyairplenum,justoutsidethe range of radiantheat

from the heat exchanger. 0.3 m (12”) from the plenum of

the main take-off isusuallysufficient;

4. Calculatethe temperaturerise by subtractingthe return air

temperaturefrom thesupplyairtemperature.

If the temperature rise exceeds the temperature specified in

Table 2 by 5˚F/2.8°C, move the “AC/HP CFM ADJUST” black

wire to high (HI) position. If the excessive temperature rise

cannot be reduced by increasing fan speed, investigate for

ductworkobstructionsor dirty and improperairfilter.

CAUTION

It is important to check the airflow and to ascertainthat the

unit does not operate above the temperatures specified in

the Technical Specifications (Table 2). This is particularly

important if a cooling coil ora heatpump hasbeen installed

in the ducts.

Hi-Limit thermal protectors should never need to engage

during the normal functioning of the appliance. They are

strictlydesigned to engage during the improper functioning

of the blower or when the filter was improperly maintained.

3.4.2- High limit verification

After operating the furnace for at least 15 minutes, restrict the

return air supply by blocking the filters or the return air register

and allow the furnace to shut off on High Limit. The electric

heaters must deactivate themselves before the warm air

temperature exceeds 200˚F (93°C).

Removethe obstructionand the elementsshouldrestartafter a

fewminutes.

4-MAINTENANCE

WARNING

Electrical shock hazard.

Turn OFF power to the furnace before any disassembly or

servicing.

Failure to do so can result in death, bodily injury and/or

property damage.

Preventive maintenance is the best way to avoid unnecessary

expense and inconvenience. Have your heating system

inspected by a qualified service technician at regular intervals.

Do not attempt to repair the furnace or its controls. Call a

qualifiedservicetechnician.

Beforecallingforrepairservice,check the followingpoints:

1. Checkfusesor the circuit breakers;

2. Check if the 15 A circuit breaker on the furnace is

disengaged;

3. Checkif the 5 A fuseof the control boardis blown;

4. Set thethermostathigherthanroom temperature. If the unit

doesnot start up, cut the powerandcalla qualifiedservice

technician.

When callingforserviceor ordering a replacementpart,specify

the model and serial numberof yourappliance.

4.1- AIR FILTER

The disposable filter should be replaced twice a year. The

presence of animal hair, dust, etc. may necessitate more

frequent changes. Dirty filters have an adverse effect on the

performanceof the central heating system.

4.2- MOTOR LUBRICATION

Do not lubricate the blower motor, since it is permanently

lubricated.