Honeywell 191108AJ Installation Instructions Manual page 9

Fig. 19—Typical hookup for timer powered through control system. Timer powered by battery when
heating or cooling equipment is on; timer takes power from system when cooling equipment is off.
Fig. 20—Internal schematic and typical hookup for T8190A Thermostat/191108AJ Wallplate in heating-
only system.
THERMOSTAT
WALLPLATE
C
L1
(HOT)
1
L2
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
THERMOSTAT
TIMER
BATTERY
3
C C RH
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 COOLING, JUMPER C-RC
AND C-Y TERMINALS.
TIMER
HEAT
ANTICIPATOR
R
C
9
RC W Y
2
HEAT
RELAY
COMPRESSOR
CONTACTOR
M826A
H
H
C
HEAT
ANTICIPATOR
FALL
W
HEAT
RELAY
C
FALL
Y
M827A
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