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9 69-0642—1
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.
L1
(HOT)
L2
1
1
L1
(HOT)
L2
1
HEAT
RELAY
COMPRESSOR
CONTACTOR
TIMER
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON COOLING, JUMPER C-RC
AND C-Y TERMINALS.
2
3
3
2
THERMOSTAT
BATTERY
SUBBASE
C C RH RC
WY
M826A
Fig. 20—Internal schematic and typical hookup for T8190A Thermostat/191108AJ Wallplate in heating-
only system.
H
FALL
C
L1
(HOT)
L2
1
1
H
FALL
C
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
HEAT
ANTICIPATOR
HEAT
ANTICIPATOR
C
C
R
WY
HEAT
RELAY
TIMER
THERMOSTAT
WALLPLATE
M827A