Zonex DIGI3U Bedienungsanleitung

DIGI3U

Three-Zone, Universal Controller for

Gas/Electric or Heat Pump Applications

Installation Guide

Part #D3MAN

Zoning Systems

That’s all we do.

3-Zone

Controller

for the “RNC”

Market

October 2011

Fused 24V 40VA Transformer

DIGI3U

System Controller

ZONE 3

ZONE 2

ZONE 1

LAT

DIGI3U is an economical auto-changeover 2 or 3 zone controller, perfect for residential RNC construction or smaller zoning systems. The DIGI3U

is a universal board that is field configurable for Gas/Electric or Heat Pump applications. The DIGI3U provides Emergency Heat control and an optional

LAT providing capacity control while protecting the coil from freezing or the heat exchanger from premature failure.

INTRODUCTION

SYSTEM DESCRIPTION

The DIGI3U is a 3-zone, auto-changeover zone controller, which can be

field configured for single stage Gas Electric or Heat Pump with auxiliary

heat applications. The DIGI3U is designed to be economically priced,

easy to install and yet full featured for the residential new construction

market. The controller offers integrated capacity control when the

optional LAT is connected, and any zone thermostat can make a

heat or cool call.

Gas Electric configuration – use standard single stage Gas Electric

thermostats. The LAT leaving air sensor can be wired into the system to

provide high and low temperature limits for compressor and heat

exchanger protection. The controller is shipped configured for Gas

Electric operation and has a 1K ohm resistor installed in the S S (sensor)

terminals of the controller. The resistor is used in place of the LAT for

2-zone Gas Electric installations that do not have a bypass. When bypass

is used, the optional LAT leaving air sensor must be connected in place

of the resistor to enable the capacity control to function in the controller.

NOTE: 3-zone installations must have bypass.

Heat Pump configuration – use a standard Heat Pump thermostat

(1 stage cool, 2 stage heat) for the STAT 1 position. Standard single stage

Gas Electric thermostats are used for STAT 2 and STAT 3 positions on the

controller. Emergency Heat operation is initiated from the Heat Pump

thermostat on STAT 1.

The LAT supply air sensor must be used when the DIGI3U controller is

configured for Heat Pump operation. The controller will then provide

high and low limit control to protect the compressor and also control

the auxiliary heat operation, based on the supply air temperature.

DIGI3U – universal GE/HP controller

LAT – capacity control

Zone Dampers

Thermostats – compatible with most

thermostats

Barometric Bypass

Fused 24V 40VA transformer – to power dampers

NOTE: Prior to June 1, 2005 the DIGI3U controllers with software versions V1.4 through V1.7 were designed to use only Gas Electric thermostats

when configured for Heat Pump operation. If you are replacing an older controller, utilized on a heat pump with this new version, simply

replace the existing Gas Electric thermostat on the STAT 1 position with a standard Heat Pump thermostat, and follow the wiring diagram on

page 4 in this Installation Guide.

DIGI3U DESIGN INFORMATION

2-3 Zone Application with Bypass Damper and LAT Sensor – Use

this method if your application is for 2 or 3 zones using a bypass damper

and LAT sensor. Zonex Systems recommends that all systems use a

bypass damper and LAT to maximize system efficiency and comfort.

Ductwork design should follow typical duct design procedures: use

ductulator to verify airflow requirements, and follow bypass-sizing

calculations found in bypass guidelines of this manual.

2-Zone Gas/Electric Applications without a Bypass Damper or

LAT Sensor – When designing a system without a bypass damper or

LAT, it is necessary to oversize the ductwork and supply registers in

order to reduce noise caused by excessive static in HVAC system. Duct

runs and dampers must be oversized by 70%, and supply grills must

be increased in size to move twice the volume of air at 700 FPM; e.g.,

if zone calls for 250 CFM and a 12x8 register were sized for non-zoned

application, double the volume of air to 500 CFM, and size register for

700 FPM, or a 14x8-supply register. If the Zonex Systems LAT capacity

control is not applied, a field supplied freeze protection and high limit

device must be installed to protect equipment. This should only be

applied to designs in which both zones are approximately the same size.

NOTE: All Heat Pump installations require the LAT sensor.

1. Remove factory installed 1K ohm resistor on S S.

2. Gas/Electric applications – install sensor as far as possible from

the FAU heat exchanger but still before the bypass tap.

3. Heat Pump application – install the sensor after the indoor coil

but before the electric strip heat assembly.

4. Secure the sensor-mounting base to the duct or AHU cabinet (HP)

with the self-tapping screws provided.

5. Run wire from the LAT sensor to S S terminals on DIGI3U controller.

Insert one wire under each S terminal, and tighten terminal screw.

6. LAT does not require calibration.

DESIGN INSTRUCTIONS

THERMOSTAT INFORMATION

LAT CAPACITY CONTROL INSTALLATION INSTRUCTIONS

For Gas Electric applications use standard single stage Gas Electric, auto changeover thermostats.

For Heat Pump applications use a standard Heat Pump thermostat (1 stage cool / 2 stage heat) for STAT 1 position only. Use standard single stage Gas

Electric, auto changeover thermostats on STAT 2 and STAT 3 positions.

S S

DIGI3U System Controller

24V 40VA Transformer

to Power Dampers

W-O/B

O/B

AIRFLOW

BYPASS

DAMPER

ZONE 3

THERMOSTAT

R Y W G C

ZONE 2

THERMOSTAT

R Y W G C

ZONE 1

THERMOSTAT

R Y W G C

TR1

TR2

R Y O/B W2 G C R Y W G C R Y W G C

W-O/B

O O O

LED

O/B W

W2 G

DPR1

DPR2

DPR3

HPB

POWER

SWITCH

DIGI3U

A/C UNIT TERMINALS

DAMPER OUTPUTS

STAT 2 STAT 3

STAT 1

PWR

CONTROL CHIP

LED

S S

JP1 JP2

WIRING – GAS/ELECTRIC DIGI3U

S S – terminals for LAT capacity control. If not applied, leave 1k ohm resistor in place; and field supplied high

and low limits should be added.

Transformer – damper transformer 24vac 40va 2 amp fuse

Damper Terminals

JP1 – not used in Gas/Electric applications

JP2 – configuration jumper for Gas/Electric or Heat Pump operation

Unit Terminals – outputs to furnace and condenser

Thermostats – standard single stage heat/cool thermostats

LAT Sensor location – mount sensor in supply before bypass takeoff

Follow this diagram for Gas/Electric applications.

S S – terminals for LAT capacity control. Heat Pump application requires the LAT

Connect W2 from controller to electric heat terminal of air handler for units with electric heat. The LAT sensor must be

installed in the supply air stream, between the indoor coil and electric strip heat elements.

Thermostats – Standard Heat Pump thermostat is required for STAT 1.

Gas/Electric thermostats are required for STAT 2 and STAT 3.

Zone Damper Terminals – refer to “Wiring – Zone Dampers” on page 5.

Transformer – Damper Transformer 24vac 40va 2 amp fuse.

JP1 – Place in “O” position for unit energizing reversing valve for cool; place in “B” position for unit energizing reversing valve

in heat.

JP2 – Heat Pump or Gas/Electric jumper is used to configure controller. Factory set for Gas/Electric operation.

24V 40VA Transformer

to Power Dampers

W-O/B

O/B

AIRFLOW

BYPASS

DAMPER

TR1

TR2

R Y O/B W2 G C R Y W G C R Y W G C

W-O/B

O O O

LED

O/B W

W2 G

DPR1

DPR2

DPR3

POWER

SWITCH

DIGI3U

A/C UNIT TERMINAL

DAMPER OUTPUTS

STAT 2 STAT 3

STAT 1

PWR

CONTROL CHIP

LED

S S

JP1 JP2

HEAT PUMP STAT

ZONE #1

GAS/ELECTRIC STAT

ZONE #3

R Y W G C

R Y O/B W2 G C

GAS/ELECTRIC STAT

ZONE #2

WIRING – HEAT PUMP DIGI3U

Follow this diagram for Heat Pump applications.

WIRING – ZONE DAMPERS

Fused 24V 40VA Transformer.

Transformer and fuse must be sized for total number of

zone dampers (12va per damper).

SERIES

DAMPER

M M

TR1

TR2

DIGI3U

SYSTEM

CONTROLLER ONE TO THREE TR SERIES

DAMPERS

Fused 24V 40VA Transformer.

Transformer and 2 amp fuse.

SERIES

DAMPER

M M

TR1

TR2

DIGI3U

SYSTEM

CONTROLLER

Wiring Up to Three TR Series Dampers to a Zone

Wiring One TR Series Damper to a Zone

SYSTEM CONTROLLER OPERATIONS – DIGI3U

GAS/ELECTRIC OPERATION

Gas Electric Operation Cool with LAT: Remove the factory installed

1K ohm resistor and install LAT sensor wired to SS terminals of DIGI3U

controller.

When any thermostat calls for cool, Y and G LEDs will illuminate, indi-

cating outputs to unit are energized and unit is running. Damper LEDs

for non-calling zones are illuminated, indicating that dampers are

closed. When all calls are satisfied, Y, G and damper LEDs will go off, de-

energizing unit and opening all dampers.

When the leaving air temperature drops below 45°, Y will de-energize

and G will remain on for 3 minutes. After 3 minutes, if the leaving air

temperature has risen above 45° cutout limit, Y will energize and

cooling will restart.

After all calls are satisfied, a 3-minute purge will be initiated by controller.

During this time the controller will not allow any calls for heat or cool.

Heat Operation with LAT: When any thermostat places a call for

heat, the W LED will illuminate and output to furnace will be energized.

Damper LEDs for non-calling zones will illuminate, indicating that

dampers are powered closed.

If leaving air rises above 145°, W will de-energize and gas valve/electric

heat will shut off. After 3 minutes, if leaving air temperature is less than

145°, then W LED will illuminate and heat will restart. When all calls

for heat are satisfied, W and damper LEDs will go off, de-energizing out-

puts to furnace and dampers.

After all calls are satisfied, controller will initiate a 3-minute purge.

During this time controller will not allow any calls for heat or cool.

Cool Operation without LAT: If not using the LAT capacity control, a

field supplied high and low limit device will need to be applied to sys-

tem to protect equipment.

When any thermostat places a call for cooling, the power LED will flash

and all dampers will remain open. After 3 minutes, Y and G LEDs will

illuminate and energize condensing unit and fan. Damper LEDs for non-

calling zones will illuminate, indicating that dampers are closed.

After initial call for cooling or low limit cutout, all cooling calls will

initiate a 3-minute fan purge cycle. When all calls are satisfied, Y, G

and damper LEDs will go off and controller will initiate a 3-minute

time delay. During this time delay, controller will not allow a call for heat

or cool.

Heat Operation without LAT: When a call for Heat is sent to the

controller, a 3-minute time delay is initiated. This time delay is indicated

by a flashing power LED.

When the 3-minute time delay is complete, the power LED is illuminated

constant and the controller will then energize the Heat output including

the corresponding damper signals.

A field supplied high and low limit device is required to provide HVAC

system protection.

Configure the DIGI3U for GE operation. Jumper JP2 must be placed in GE position on controller. This will allow controller to control gas fur-

naces and electric heat air handlers and cooling condensers.

FOR APPLICATIONS WITHOUT LAT CAPACITY CONTROLLER

FOR APPLICATIONS USING THE LAT SENSOR

SYSTEM CONTROLLER OPERATIONS – DIGI3U

Y W-O/B W2 G PWR DPR MODE FUNCTION

OFF OFF OFF OFF OFF OFF OFF Power off

OFF OFF OFF OFF ON OFF ON Power on, blower off, all zones satisfied

OFF OFF OFF ON ON 0 Vent Blower on, compressor off, all zones satisfied

OFF OFF OFF ON ON 1 Purge Blower on, compressor off. DPR w/LED on are closed

ON OFF OFF ON ON 1 Cooling Cooling stage, compressor on. DPR w/LED on are closed

OFF ON OFF ON ON 1 Heating Heating stage, compressor off. DPR w/LED on are closed

OFF OFF OFF ON FL 1 LAT* System in Low Temp cutout condition (Cooling)

OFF OFF OFF ON FL 1 LAT* System in High Temp cutout condition (Heating)

STATUS LEDS/ GAS ELECTRIC MODE

NOTE: The “O” and “B” jumpers have no effect on operation when the controller is set in GE mode.

1 = One or more damper LEDs on 0 = All damper LEDs off

* LAT Capacity Control. The factory optional thermistor is in place to function in this mode.

Changeover Gas/Electric: While controller is operating in heat or cool,

if another thermostat places a call for the opposite mode, a changeover

sequence will begin. The controller will continue running in its current

mode for 15 minutes or until current call is satisfied, whichever occurs first.

After 15 minutes, or call satisfaction, a 3-minute purge will start. At the

end of the 3-minute time delay, the opposite call will begin. If there is

still an opposing call, changeover sequence will initiate and repeat

changeover cycle until opposing calls are satisfied.

When all calls are satisfied, LEDs will go off and a 3-minute time delay

will be initiated. During this time, controller will not allow any calls for

heat or cool.

Purge Mode: When all calls are satisfied or a changeover occurs, a

3-minute recycle delay will be initiated. During this time, the controller

will not process any calls for heat or cool; and the compressor or gas

valve will shut down and blower will continue to run. All dampers go

open during this time

SYSTEM CONTROLLER OPERATIONS – DIGI3U

HEAT PUMP OPERATION

The DIGI3U controller, when configured for Heat Pump operation,

allows the use of a standard Heat Pump thermostat (1 stage cool / 2

stage heat) to be connected to the STAT 1 position on the controller.

Emergency Heat control is selected from the Heat Pump thermostat

wired to the STAT 1 position. Standard Gas/Electric thermostats are

used for STAT 2 and STAT 3 positions.

Cool Mode with LAT: When a thermostat makes a call for cool, Y, G, and

W-O/B LEDs and outputs to unit are energized. Any non-calling zone

dampers are energized to close. The cool call continues to operate unless

the supply air temperature drops below 45°, at which time the controller

will de-energize “Y” for approximately 3 minutes.

After 3 minutes, if the leaving air has risen above 45°, Y will energize,

restarting cool operations. When the cool mode is satisfied from the last

calling thermostat, W/OB remains energized until an opposite call for

heat is made.

If this controller is configured for “B” reversing valve operation, W-O/B LED

will not energize for cool mode; “B” energizes reversing valve in heating.

After all calls for cooling are satisfied Y, G and all damper LEDs will go

off and controller will initiate a 3-minute purge. During this time

controller will not allow a call for heat or cool.

Heat Mode with LAT: When a thermostat makes a call for heat, Y & G

LEDs and unit outputs are energized. Any non-calling zone damper

LEDs and outputs are energized to close. The heat call will continue to

operate unless the supply air temperature rises above 120°, at which

time the controller will de-energize “Y” for approximately 3 minutes.

After 3 minutes, if leaving air is less than 120°, Y will reenergize and

heat will restart.

Auxiliary heat is energized after 3 minutes of run time and if the leaving

air temperature is 88° or less. The auxiliary heat will cycle off when the

leaving air temperature reaches 100°. When the controller energizes W2

to the heat pump strip heater, the W2 LED is illuminated. When all calls

for heat are satisfied, W, W2 ,G and damper LEDs will go off and

controller will initiate a 3-minute purge. During this time, controller will

not allow a call for heat or cool.

Configure DIGI3U for heat pump operations. Place jumpers JP1 and JP2 in desired position: JP1 “O,” reversing valve for cooling (“B” position

will energize reversing valve in heating), JP2 set in HP position.

HEAT PUMP CONFIGURATION REQUIRES USING THE LAT SENSOR

SYSTEM CONTROLLER OPERATIONS – DIGI3U

Jumper Y W-O/B W2 G PWR DPR MODE FUNCTION

OFF OFF OFF OFF OFF OFF OFF Power off

OFF OFF OFF OFF ON OFF ON Power on, blower off, all zones satisfied

OFF OFF OFF ON ON 0 Vent Blower on, compressor off, all zones satisfied

OFF OFF OFF ON ON 1 Purge Blower on, compressor off. DPR w/LED on are closed

O ON ON OFF ON ON 1 Cooling Cool stage, compressor on. DPR w/LED on are closed

B ON OFF OFF ON ON 1 Cooling Cool stage, compressor on. DPR w/LED on are closed

O ON OFF OFF ON ON 1 Heating Heat, 1st stage, compressor on. DPR w/LED on are closed

B ON ON OFF ON ON 1 Heating Heat, 1st stage, compressor on. DPR w/LED on are closed

O ON OFF ON ON ON 1 Heating Heat, 2nd stage, compressor on. DPR w/LED on are closed

B ON ON ON ON ON 1 Heating Heat, 2nd stage, compressor on. DPR w/LED on are closed

O OFF ON ON ON ON 1 Heating* Em Heat, compressor off. DPR w/LED on are closed

B OFF OFF ON ON ON 1 Heating* Em Heat, compressor off. DPR w/LED on are closed

O OFF ON OFF ON FL 1 LAT** System in Low Temp cutout condition (Cooling)

B OFF OFF OFF ON FL 1 LAT** System in Low Temp cutout condition (Cooling)

O OFF OFF OFF ON FL 1 LAT** System in High Temp cutout condition (Heating)

B OFF ON OFF ON FL 1 LAT** System in High Temp cutout condition (Heating)

A = On when reversing valve jumper is in O position. B = ON when reversing valve jumper is in B position

C = On when emergency heat is on. 1 = One or more damper LEDs on 0 = All damper LEDs off

*2 – Stage Gas/Electric Thermostat is required.

**LAT Capacity Control. The factory optional thermistor is in place to function in this mode.

STATUS LED LEGEND

W-O/B Reversing valve LED, yellow. On when the reversing valve is energized.

Y1 Compressor LED, yellow. On when the first compressor stage is energized.

G Indoor blower LED, green. On when the indoor blower is energized by the DTHP4A Controller.

W2 Auxiliary heat LED, red. On when the auxiliary heat is energized.

PWR Power LED, orange. On when DTHP4A is powered. Flashing during capacity control cutout.

DPR Damper status LED, red. One per damper. On when damper is closed.

Emergency Heat Operation: To put the Heat Pump system into

Emergency Heat, the mode selector switch on the Heat Pump thermostat

(STAT 1), must be placed in the Emergency Heat position and must then

make a call for heat in that mode. This “latches” the controller in the

Emergency Heat mode. After STAT 1 makes a call and then satisfies, any

consecutive heat calls from STAT 2 and STAT 3 will bring on Emergency

Heat independently. The supply dampers will actuate independently

according to the individual zone demand.

To “unlatch” the controller from Emergency Heat, the Heat Pump thermostat

(STAT 1) mode switch must be placed in the normal Heat mode, and

make a heat call on Y (“O” mode) or Y and O (“B” mode). After the

Heat Pump thermostat makes a standard heat call, the Emergency Heat

will be “unlatched” and all consecutive heat calls from any thermostat

will bring on the compressor.

Purge Mode: When all calls are satisfied or a changeover occurs, a

3-minute recycle delay will be initiated. During this time, the controller

will not process any calls for heat or cool; and the compressor or gas

valve will shut down and blower will continue to run. All dampers go

open during this time

Changeover Heat Pump: While controller is operating in heat or cool,

if another thermostat places a call for the opposite mode, a changeover

sequence will begin. The controller will continue running in its current

mode for 15 minutes or until current call is satisfied, whichever occurs first.

After 15 minutes, or the call is satisfied, a 3-minute purge will start. At

the end of the 3-minute time delay, the opposite call will begin. If there

is still an opposing call, changeover sequence will initiate and repeat

changeover cycle until opposing calls are satisfied.

When all calls are satisfied, LEDs will go off and a 3-minute time delay

will be initiated. During this time, controller will not allow any calls for

heat or cool.

STATUS LEDS/ HEAT PUMP MODE

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