Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions page 34

To Humidifier Leads
To Humidifier Leads
Fig. 32 - - Field- -supplied Isolation Relay for Humidifiers with Internal Power Supply
FIVE
WIRE
BLOWER
THREE-WIRE
DOOR
HEATING-
SWITCH
ONLY
BLK BLK
WHT WHT
GND
115-VOLT FIELD- JUNCTION
SUPPLIED BOX
FUSED
DISCONNECT
FURNACE
NOTE 2
W C Y R
W2
C
O
COM
N
W/W1
T
NOTE 1
R
Y/Y2
O
R
L
G
24-VOLT
TERMINAL NOTES: 1. Connect Y/Y2-terminal as shown for proper operation.
BLOCK 2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
Fig. 33 - - Typical Two- -Stage Field Wiring Diagram
34
To HUM Terminal On
Furnace Control Board
24 V
Coil
To Com/24V Screw Terminal
on Thermostat Strip
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
1-STAGE
THERMOSTAT
G
FIELD-SUPPLIED
TERMINALS
FUSED DISCONNECT
CONDENSING
UNIT
A11157
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
SINGLE
PHASE
GND
A11401