Trane BAYSTAT253A Montageanleitung

® U.S. Registered Trademark

INSTALLER’S GUIDE

69-1698

BAYSTAT253A

Humidity Control

APPLICATION

The humidity control provides automatic low voltage

control of humidifiers in central heating and cooling

equipment for both humidification and dehumidification

applications. See Fig. 1. It has an spst, snap-acting,

dust-proof switch that opens when humidity rises above

the control setting. It is designed for wall or surface duct

mounting.

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow

them could damage the product or cause a haz-

ardous condition.

2. Check the ratings given in the instructions and on

the product to make sure the product is suitable

for your application.

3. Installer must be a trained, experienced service

technician.

4. After installation is complete, check out product

operation as provided in these instructions.

CAUTION

Personal Injury Hazard.

Power supply can cause electrical shock.

Disconnect power supply before beginning

installation.

Location and Mounting

A mounting template is included for mounting the

humidity control next to your thermostat. See Fig. 2.

However, the humidity control can be mounted in any

other convenient location in the living area or equipment

room.

NOTE: The humidity control electrical connections are

not shared with the thermostat.

Fig. 1. Humidity control.

Wall Mounting

IMPORTANT

Mount the control in an area with average

room temperature and average relative

humidity.

Select a location for mounting the humidity control:

1. Hold the mounting template (included) next to

your thermostat. Select the mounting side for the

humidity control. The template is reversible for

mounting on either the left or right side of the

humidity control. See Fig. 2.

2. Mark the holes for the two mounting screws

(included). Then mark the hole for the low voltage

wiring on the template that corresponds with the

side selected in step 1.

3. Remove the template and drill the holes.

4. Run low voltage wiring to the location and pull

about 6 in. (152 mm) of wire through the hole.

5. Plug hole with nonflammable insulation to prevent

drafts from affecting the control operation.

6. Remove the humidity control case from the base.

See Fig. 1.

7. Position the base on the wall with the arrow up.

8. Use the two in. (25 mm) mounting screws to

secure the base to the wall.

M19845

CASE REMOVAL

SLOT

HOLE FOR WIRING

THE DUCT MOUNTING

INSTALLATIONS

Humidity Control

Pub. No.: 22-5203-01

BAYSTAT253A HUMIDITY CONTROL

69-1698 2

Pub.No.: 22-5203-01

Fig. 2. Positioning mounting template.

IMPORTANT

Use 18- to 22-gauge wire for proper wiring.

9. Connect the low voltage wires to the leads on the

humidity control.

10. Replace the humidity control case.

Duct Mounting

IMPORTANT

When mounting near an elbow area, locate the

control 6 in. (152 mm) upstream from the

elbow so the element is exposed to the normal

airflow (Fig. 3).

Fig. 3. Selecting duct location for control.

1. Locate the control at least 8 in. (203 mm)

upstream from the humidifier in the return air duct.

See Fig. 3.

2. Apply the duct template to the duct location.

3. Use the duct template, Fig. 4, to make the

opening and mounting holes for the humidity

control.

4. Remove the humidity control case from the base.

See Fig. 1.

5. Position the foam gasket on the humidity control

base.

6. Position the base on the duct with the arrow up.

7. Use the four 1 in. (25 mm) mounting screws to

secure the base to the duct.

8. Connect the low voltage wires to the leads on the

humidity control.

9. Replace the humidity control case.

IMPORTANT

Use 18- to 22-gauge wire for correct wiring.

Fig. 4. Positioning return air duct template.

M19830

THERMOSTAT

WALLPLATE

MOUNTING

TEMPLATE

MOUNTING

HOLES (2)

WIRING HOLES FOR MOUNTING ON RIGHT.

USE LEFT HOLES FOR MOUNTING ON LEFT.

ALTERNATE LOCATION

RETURN

AIR RETURN

AIR

6 in. (152 mm)

MINIMUM 15 in. (381 mm)

MINIMUM

BEST

LOCATION

RETURN AIR DUCT M13369

CAUTION

Equipment Damage Hazard.

Be careful when selecting control

location and cutting hole in ductwork.

Do not cut or drill into air conditioning

or electrical accessories.

Do not install control on supply (hot air) ductwork.

To use template:

1. Remove backing and apply template to duct.

2. Cut along template dotted line and drill the

mounting holes.

4X DRILL 7/64 IN. DIAMETER

PERCER 4 X 7/64 PO.

MISE EN GARDE

Risque d'endommager le matériel.

Faire attention au moment de choisir

l'emplacement du régulateur et de percer les

trous dans la gaine.

Ne pas couper ou percer les accessoires

électriques ou de climatisation.

Ne pas installer le régulateur sur la gaine

d'alimentation (air chaud).

Utilisation du gabarit:

1. Retirer l'endos du gabarit et placer le gabarit

sur la gaine.

2. Couper le long de la ligne pointillée du gabarit

et percer les trous de fixation.

DUCTTEMPLATE

GABARIT DE GAINE

M13373

BAYSTAT253A HUMIDITY CONTROL

3 69-1698

Pub.No.: 22-5203-01

HEATING CYCLE HUMIDITY

CONTROL WIRING

CAUTION

Personal Injury Hazard.

Power supply can cause electrical shock and

injury.

Disconnect power supply before installation or

servicing.

All wiring must comply with applicable local codes, ordi-

nances and regulations. Make wiring connections

according to humidifier instructions, if available; other-

wise, see typical wiring diagrams in Fig. 5 through 9.

IMPORTANT

Select models of fan centers include humidifier

taps so the current sensing relay or sail switch

is not needed.

If not using a current sensing relay or sail

switch, the humidifier must be energized

during blower motor cycles for correct

operation.

On multispeed blower applications, do not wire

the high voltage side of the transformer to the

same power source that services the furnace

blower. Premature transformer burnout can

occur.

Fig. 5. Typical wiring diagram for

system with fan interlock.

Fig. 6. Typical wiring diagram for system

with 2-speed fan motor.

Fig. 7. Typical wiring diagram of current

sensing relay with humidifier.

Fig. 8. Typical wiring diagram

of sail switch with humidifier.

Fig. 9. Typical wiring diagram for steam humidifiers.

PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION

AS REQUIRED.

24 VAC WIRING.

HUMIDIFIER

TRANSFORMER

FURNACE

FAN

MOTOR

HUMIDISTAT

FAN CONTROL

(HOT)

M19831

POWER

SUPPLY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

24 VAC WIRING.

HUMIDIFIER

TRANSFORMER

2-SPEED

FAN

MOTOR

DPST

SWITCHING

RELAY

HUMIDISTATFAN CONTROL

(HOT)

M19832

POWER

SUPPLY

M19833

(HOT)

L2 1

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

24V WIRING.

HUMIDIFIER

TRANSFORMER

WATER

SOLENOID

LEAD WIRE

CURRENT

SENSING

RELAY CLO HI

HUMIDISTAT

M19834

(HOT)

L2 1

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

24V WIRING.

HUMIDIFIER

TRANSFORMER

HUMIDISTAT

SAIL

SWITCH

M19835

FOLLOW THE INSTALLATION INSTRUCTIONS

INCLUDED WITH THE STEAM HUMIDIFIER

TO WIRE THE SYSTEM FAN.

NOTE:

HUMIDIFIER

HUMIDISTAT

SYSTEM

FAN

HUMIDISTAT

TERMINALS

FAN WIRING

TERMINALS

24V WIRING.

BAYSTAT253A HUMIDITY CONTROL

69-1698 4

Pub.No.: 22-5203-01

HEATING CYCLE HUMIDITY

CONTROL ADJUSTMENTS

Humidity Control Adjustment

To maintain optimum humidity control without causing

condensation on cold surfaces such as windows, the

homeowner must adjust the setpoint as the outdoor

temperature changes.

To reduce relative humidity, reduce the setpoint

approximately 3% RH humidity every 24 hours. To

increase relative humidity, increase the setpoint

approximately 3% RH every 24 hours.

Setpoint Adjustment

Set the humidity setpoint according to the prevailing

outdoor temperature. See Table 1 for recommended

settings.

Table 1. Recommended Humidity Control Setting.

Outdoor Temperature Recommended

Humidity Control

Setting°F °C

-20 -29 15

-10 -23 20

0 -18 25

+10 -12 30

+20 -7 35

>+20 >-7 40

BAYSTAT253A HUMIDITY CONTROL

5 69-1698

Pub.No.: 22-5203-01

COOLING CYCLE HUMIDITY

CONTROL WIRING

CAUTION

Personal Injury Hazard.

Power supply can cause electrical shock and

injury.

Disconnect power supply before installation or

servicing.

All wiring must comply with applicable local codes, ordi-

nances and regulations. Make wiring connections

according to humidifier instructions, if available; other-

wise, see typical wiring diagrams in Fig. 10 and 11.

COOLING CYCLE HUMIDITY

CONTROL ADJUSTMENTS

It is desirable to maintain the humidity in the living

space at the humidification comfort range of 25 to 50

percent relative humidity.

To reduce the relative humidity, position the arrow on

the humidity control to the humidity control setting:

40 setting controls to 40+/-10% RH.

50 setting controls to 50+/-10% RH.

When activated, the humidity control lowers the

furnace/air handler blower speed, reducing air velocity

over the furnace/air handler coil and removing a geater

amount of moisture from the air.

Fig. 10. Wiring for variable-speed air handler.

SUPPL. HTR.

CONTROL BOX

1 LOW VOLTAGE WIRING TO BE NO. 18 A.W.G. MINIMUM CONDUCTOR.

2 WHEN HEATERS ARE USED, DISCARD POWER LEADS WITH

POLARIZED PLUG PM-A AND CONNECT 1-PF TO MATING PLUG IN

THE HEATER CONTROL BOX AS SHOWN.

3 TERMINALS W2 WILL HAVE INTERNAL CONNECTIONS ONLY IF 2ND

CONTACTOR IS USED BY THE HEATER FOR CONTROLLING POWER

TO ELECTRIC HEATING ELEMENTS. IF 2ND (BH) CONTACTOR IS NOT

USED, THEN FIELD CONNECTIONS TO W2 CAN BE OMITTED AS

APPROPRIATE.

4 IF ODT IS NOT USED, THEN CONNECT APPROPRIATE JUMPER

FROM W1 TO W2 TO W3 ON LVTB.

5 IF HUMIDISTAT IS NOT USED, CONNECT JUMPER FROM "R" TO "BK"

FOR FULL TONNAGE AIRFLOW IN COOLING.

6 CONNECT IN THIS MANNER IF O.D. UNIT HAS "F" CONNECTION.

7 CONNECT W3 TO W2 ONLY IF USING HEATER WITH 3 HEATER STAGES.

8 SEE HEATER WIRING DIAGRAM FOR HEATING ANTICIPATOR SETTING.

24 V FACTORY WIRING

INTER-COMPONENT WIRING

LINE V

TO POWER SUPPLY PER

LOCAL CODES AND AS

DEFINED IN FIELD WIRING TABLE

THERMOSTAT VARIABLE SPEED

AIR HANDLER

HEAT PUMP

O.D. SECTION

(SINGLE SPEED)

HUMIDISTAT

Y/Y2

YI/YLo

ODT

BR/X2

OR BK

24 V

LINE V FIELD WIRING

M19852

BAYSTAT253A HUMIDITY CONTROL

69-1698 6

Pub.No.: 22-5203-01

Fig. 11. Wiring for variable-speed, 2-stage furnace (2H/1C) using 1H/1C thermostat.

OPERATION AND CHECKOUT

Place the system in operation and observe through at

least one complete cycle to make certain that all

components are functioning correctly.

FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE

2 STAGE HEATING, 1 STAGE COOLING

USING A 1 STAGE HEATING, 1 STAGE COOLING THERMOSTAT

(OUTDOOR SECTION WITHOUT TRANSFORMER)

THERMOSTAT VARIABLE SPEED

2-STAGE FURNACE

YYY/Y2

B/C

RW14

JUMPER

M19853

YI/YLo BK/2

BK/3

WH/1

FURNACE

JUNCTION

BOX

GROUND

SCREW

HUM

TO 115 V 1 PH.,

60 HZ., POWER

SUPPLY PER

LOCAL CODES

FIELD ADDED JUMPER

W1 TO W2

2ND STAGE WILL FIRE

10 MINUTES AFTER 1ST.

EAC

1 BE SURE POWER AGREES WITH EQUIPMENT NAMEPLATE(S).

6 THIS WIRE IS ONLY FOR THERMOSTATS REQUIRING CONNECTION TO TRANSFORMER COMMON TERMINAL.

7 THE "Y" TERMINAL FROM THE THERMOSTAT MST BE WIRED TO THE "Y" TERMINAL OF THE FURNACE

CONTROL FOR PROPER BLOWER OPERATION DURING COOLING.

2 LOW VOLTAGE (24 V WIRING) TO BE NO. 18 A.W.G. MINIMUM.

3 GROUNDING OF EQUIPMENT MUST COMPLY WITH LOCAL CODES.

4 SET THERMOSTAT HEAT ANTICIPATOR PER UNIT WIRING DIAGRAM.

5 THESE LEADS PROVIDE 115 V POWER FOR CONNECTION OF ELECTRONIC AIR CLEANER AND HUMIDIFIER

MAXIMUM LOAD 1.0 AMPS EACH.

8 SET DIP SWITCHES WITH POWER OFF PER INSTALLATION INSTRUCTIONS TO SET AIRFLOW AND

INDOOR FAN OFF DELAYS.

9 OPTIONAL HUMIDITY CONTROL IS TO BE CONNECTED BETWEEN R AND BK. FACTORY INSTALLED JUMPER R TO BK

ON THE CIRCUIT BOARD MUST BE CUT IF OPTIONAL HUMIDISTAT IS USED. THE JUMPER MUST ALSO BE

CUT WHEN APPLYING AN AIRFLOW COMMAND SIGNAL TO THE BK INPUT SUCH AS WITH THE VARIABLE

SPEED, SINGLE-ZONE COMMAND SIGNAL TO THE BK INPUT SUCH AS WITH VARIABLE SPEED, SINGLE-ZONE

AND MULTI-ZONE SYSTEM CONTROLLERS. ON SINGLE SPEED COOLING, ONLY/NON-HEAT PUMP

HUMIDISTAT. FOR TWO COMPRESSOR OR TWO SPEED SYSTEMS, JUMPER YLo TO O

24 V

FACTORY WIRING

INTER-COMPONENT WIRING

LINE V

24 V

LINE V

FIELD WIRING

BAYSTAT253A HUMIDITY CONTROL

7 69-1698

Pub.No.: 22-5203-01

69-1698 G.H. 11-03 For more information, contact your local Dealer (Distributor).

BAYSTAT253A HUMIDITY CONTROL

Pub.No.: 22-5203-01

American Standard Inc.

6200 Troup Highway

Tyler, TX 75711-9010

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