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)
7
6
9
5
5
THERMOSTAT
VARIABLE SPEED
2-STAGE FURNACE
W
G
B
Y
Y
Y/Y2
R
W2
BK
B/C
W1
G
O
B/C
R
W14
JUMPER
M19853
YI/YLo
BK/2
BK/3
WH/1
BK
LH
BK
BK
FURNACE
JUNCTION
BOX
GROUND
SCREW
LN
WH
WH
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
