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
CCRW
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
1POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
CCRW
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
CCRW
HEAT
RELAY
TIMER
THERMOSTAT
SUBBASE
1POWER 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
32
THERMOSTAT
BATTERY
SUBBASE
C C RH RC WY
M825A