Carrier 38HQ - Manual (Page 9)

THERMOSTAT 40AQ OR 40QB FAN COIL 38HQ
SUBBASE COOLING CONTROL COMPRESSOR
HH93AZ073 OR KIT SECTION
HH93AZ075 TERMINAL BOARD TERMINAL BOARD
COOLING AND ONE-STAGE HEATING
(38HQ/40AQ OR 40QB WITHOUT ELECTRIC HEATER)
A
THERMOSTAT 40AQ, 40QB OR 40FQ 38HQ
SUBBASE ELECTRIC HEATER COMPRESSOR
HH93AZ073 0R TERMINAL SECTION
HH93AZ075 BOARD TERMINAL BOARD
COOLING AND TWO-STAGE HEATING
(38HQ WITH 40AQ,40QB OR 40FS/28HQ/VQ
EQUIPPED WITH ELECTRIC HEATER-,
SUPPLEMENTAL HEAT, NO OUTDOOR THERMOSTATS)
B
THERMOSTAT 40AQ.40QB 0R40FQ 38HQ
SUBBASE ELECTRIC HEATER COMPRESSOR
HH93AZ073 0R TERMINAL SECTION
HH93AZ075 BOARD TERMINAL BOARD
COOLING AND TWO-STAGE HEATING
(38HQ WITH 40AQ, 40QB OR 40FS/28HQ/VQ
EQUIPPED WITH ELECTRIC HEATER;
SUPPLEMENTAL HEAT, ONE OUTDOOR THERMOSTAT
TH ERMOSTAT 40AQ OR 40 FQ
SUBBASE ELECTRIC HEATER
HH93AZ0730R TERMINAL
HH93AZ075 BOARD
38HQ
COMPRESSOR
SECTION
TERMINAL BOARD
38HQ
OUTDOOR COIL
JUNCTION BOX
COOLING AND TWO-STAGE HEATING
(38HQWITH 40FS/28HQ/VQ
EQUIPPED WITH ELECTRIC HEATER;
SUPPLEMENTAL HEAT, TWO OUTDOOR THERMOSTATS)
THERMOSTAT 40DQ
SUBBASE
ELECTRIC HEATER
HH93AZ073 TERMINAL SPLICE
OR HH93AZ075 CONNECTIONS
ORN
38 HQ
COMPRESSOR
SECTION
TERMINAL BOARD
&
&
&
&-
0-
&
[IF
BRN
_ v i o _ _ ^
COOLING AND TWO-STAGE-STAGE HEATING
(38HQ WITH 40DQ EQUIPPED WITH ELECTRIC HEATER
WITH TRANSFORMER, SUPPLEMENTAL HEAT,
NO OUTDOOR THERMOSTAT
DFT — Defrost Thermostat
EHR — Supplemental Heat Relay
ODT — Outdoor Thermostat
------------ Factory Wiring
----------- Field Wiring
*Transformer (60 va) located in cooling control kit or electric heater
fTerminal L is identified as terminal X on some former thermostats
(Required for system malfunction warning indicator on com­
pressor section )
{Remove 1 or both factory-installed jumpers (connection B) when
installing outdoor thermostats (ODT) shown in connections C
and D
Fig. 9 — Control Circuit Connections
matically energized by the manually operated sup­
plemental heat switch in the indoor thermostat
subbase. The thermostat locks out compressor and
the
relay bypasses the outdoor thermostats for
electric heater operation during heat pump shut­
down. When one outdoor thermostat is used, a
supplemental heat relay is not required. The supple­
mental heat switch in the indoor thermostat subbase
bypasses outdoor thermostat, locks out compressor
and activates electric heater.
MOUNT OUTDOOR THERMOSTAT(S) —
Locate maximum of 2 outdoor thermostats in
control voltage section of outdoor coil junction box.
Fasten in place with sheet metal screws.
MOUNT SUPPLEMENTAL HEAT RELAY in
convenient location on indoor unit. Attach with
sheet metal screw.
To Start System — (Be sure crankcase heater has
been energized for 24 hours.) Adjust the thermo­
stat as follows:
1. Set selector switch at OFF.
2. Turn on main disconnect switch(es) to indoor
and outdoor units.
3. Set fan switch as desired (ON or AUTO.).
4. Set thermostat dial at desired temperature.
5. Set selector switch at HEAT or COOL.
Check system refrigerant charge. See Refrigerant
Charging.