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69-0452—8
5
T841A HEATING-COOLING HEAT PUMP THERMOSTAT
Fig. 5. Internal schematic and typical wiring diagram for TRADELINE® T841A1423 and T841A1464 (sold only in
Australia) with AUX. HEAT, EM. HEAT and CHECK LEDs. Provides heat or cool changeover relay control and
automatic fan in EM. HEAT mode.
H2
FALL
H1
FALL
C1
L1
(HOT)
L2
1
W3
G
R
W2
E
L
B
X
O
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
H1/C1
ANTICIPATOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
AUTO FAN IN EM. HEAT.
2
1
2
FAN
SWITCH
AUTO
ON
AUX. HT.
LED (GREEN)
EM. HT.
LED (RED)
CHECK
LED (RED)
COOL CHANGE-
OVER VALVE
M6059C
COMPRESSOR
CONTACTOR
HEAT CHANGE-
OVER VALVE
SYSTEM MONITOR
EM. HT. RELAY
RTD 1
FAN REALY
RTD 3EHR 2
ODT 2
RD
RTD 1
ODT 1
EHR 1
RDT 2
8
5
9
3
4
12
11
10
6
Y
LACO
CHP
Fig. 6. Second stage adjustable heat anticipator indicator.
1.2
.8
.6
.4
.3
.2
.15
.12
.10
EM.HEAT HEAT OFF COOL
MOVE INDICATOR
TO MATCH CURRENT
RATING OF PRIMARY CONTROL
M2962B
LONGER