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LOW VOLTAGE FIELD WIRING FOR 12HPB SERIES UNITS WITH CB19/CBH19/ECB19,
CB29M/ CB30M/ ECB29 COIL & TYPICAL ROOM THERMOSTAT
"T" & "L" connections used only if
field provided & installed ambient
compensating thermistor & service
light thermostat are installed in the
12HPB unit & proper t’stat is used.
Earlier 12HPB units only will have
the"T" & "L" connections.
"T" & "L" connections used only if
field provided & installed ambient
compensating thermistor & service
light thermostat are installed in the
12HPB unit & proper t’stat is used.
Earlier 12HPB units only will have
the"T" & "L" connections.
TermInals "Y2" & "W2" require no
connection. they are junction ter-
minals only & have no internal
connection to the B24.
Common terminal "C" or
"X" used only on some
thermostats.
LOW VOLTAGE FIELD WIRING FOR 12HPB SERIES UNITS
WITH B24/ECB24 BLOWER COIL & TYPICAL ROOM THERMOSTAT
Thermostat heat anticipation
setting 0.4 amp electric heat
for thermostats with adjust-
able anticipators.
When thermostat with 2 stages
of auxilary heat is used,
connect second stage aux. heat
to terminal "W2" & remove
jumper between terminals "R"
& " W".
If outdoor thermostat is used,
remove jumper between terminals
"R" & "W2".
Emergency heat relay (used only if
outdoor t’ stat is used) field provided
& installed near indoor unit, 24VAC,
5VA max, NEC Class 2
Common terminal "C"
or "X" used only on
some thermostats.
2
1
3
4
2
3
1
4
BLOWER COIL
WITH ELECTRIC HEAT
LOW VOLTAGE TERMINAL
STRIP
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