Honeywell TRADELINE T8090A User Manual page 9

Fig. 19—Typical hookup for clock powered through control system. Clock powered by battery when
heating or cooling equipment is on; clock takes power from system when cooling equipment is off.
Fig. 20—Internal schematic and typical hookup for T8090A Thermostat/191108AJ Wallplate in heating-
only system.
THERMOSTAT
WALLPLATE
L1
(HOT)
1
L2
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FOR STEAM SYSTEM, KEEP JUMPER IN PLACE. FOR NON STEAM SYSTEM, CUT AND
TAPE-OFF THE JUMPER AND ADJUST HEAT ANTICIPATOR FOR PROPER EQUIPMENT CYCLING.
THERMOSTAT
CLOCK
BATTERY
3
C C
SUBBASE
L1
(HOT)
1
L2
L1
(HOT)
1
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2 JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER
POWERS BOTH HEATING AND COOLING.
3 FOR POWER STEALING ON HEATING, JUMPER
C-RC AND C-Y TERMINALS.
CLOCK
2
C R
C
RH RC
W
2
HEAT
RELAY
COMPRESSOR
CONTACTOR
H
C
HEAT
ANTICIPATOR
FALL
9
Y
M720A
H
C
FALL
HEAT
ANTICIPATOR
2
W
HEAT
RELAY
M5349A
69-0750—1