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BAYSTAT253A HUMIDITY CONTROL
Y
B
1 BE SURE POWER AGREES WITH EQUIPMENT NAMEPLATE(S).
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.
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.
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
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.
Pub.No.: 22-5203-01
69-1698
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)
VARIABLE SPEED
THERMOSTAT
2-STAGE FURNACE
R
YI/YLo
7
Y
G
W
6
B/C
R
W14
TO 115 V 1 PH.,
JUMPER
60 HZ., POWER
SUPPLY PER
BK
9
LOCAL CODES
O
5
5
Y/Y2
G
FIELD ADDED JUMPER
W1 TO W2
2ND STAGE WILL FIRE
10 MINUTES AFTER 1ST.
W1
W2
INTER-COMPONENT WIRING
B/C
6
GROUND
SCREW
LH
LN
WH
HUM
BK
WH
EAC
BK
24 V
FIELD WIRING
LINE V
24 V
FACTORY WIRING
LINE V
M19853
FURNACE
JUNCTION
BOX
BK
WH/1
BK/3
BK/2
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