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69-0642—1 8
Typical Wiring Diagrams
Fig. 15—Typical hookup for timer powered by
separate 24-Vac transformer.
L1
(HOT)
L2
1
L1
(HOT)
L2
1
C
C
R
W
HEAT
RELAY
TIMER
THERMOSTAT
SUBBASE
1
2
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
BATTERY BACKUP MAY BE USED IF POWER TO
TIMER IS INTERRUPTED.
M822A
BATTERY
Fig. 16—Typical hookup for timer powered by
two AAA alkaline batteries only.
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
C
C
R
W
HEAT
RELAY
TIMER
THERMOSTAT
SUBBASE
M823A
BATTERY
Fig. 17—Typical hookup for timer powered by
system transformer. Timer powered by battery
when system is not powered (e.g., power to
system is off or interrupted).
L1
(HOT)
L2
1
C
C
R
W
HEAT
RELAY
TIMER
THERMOSTAT
SUBBASE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M824A
BATTERY
Fig. 18—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
heating 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 HEATING, JUMPER
C-RH AND C-W TERMINALS.
2
3
3
2
THERMOSTAT
BATTERY
SUBBASE
C C RH RC
WY
M825A