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Fig. 5—Schematic and hookup for Y594G.
THERMOSTAT
FALL
H1
H1 ANTICIPATOR
H2 ANTICIPATOR
FALL
H2
RISE
CO
C1 ANTICIPATOR
RISE
C1
Fig. 6—Schematic and hookup for Y594R.
THERMOSTAT
FALL
H1
C1
FALL
H2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
HEATING
Move the heating setpoint lever on the T874 about
10°F (6°C) above room temperature. Heating equipment
should start and the fan should run. Move the heat lever
about 10°F (6°C) below room temperature. The heating
equipment and fan should shut off.
2
3
4
5
6
8
9
10
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FAN SWITCH
H1 & C1
ANTICIPATOR
3
4
5
6
H2
ANTICIPATOR
11
RESET HEATER
12
Checkout
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
EM. HT.
AUTO
OFF
SUBBASE
AUTO
ON
EM. HT.
LED (RED)
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
NOTE: In heat pump applications, a minimum off-timer
provides a five-minute time delay before starting com-
pressor when the thermostat last turned the compressor
off, or when the system first received power. This delay
prevents compressor short cycling.
3
SYSTEM COMPONENTS
O
COOL CHANGEOVER VALVE
G
FAN RELAY
R
W
AUX. HEAT RELAY
X
EM. HEAT RELAY
EM. HEAT
LED (RED)
B
COMPRESSOR
CONTACTOR
Y
SYSTEM COMPONENTS
L1
(HOT)
1
FAN RELAY
G
R
AUX. HT. RELAY
W
H
"H" RELAY
B
X
EM. HT. RELAY
T
C815A1039
THERMISTOR
O
CHANGEOVER VALVE (COOL)
Y
COMPRESSOR
CONTACTOR
L1
(HOT)
L2
1
M5723
L2
M3173A
69-0882B
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