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1 – Turn off all power to unit and
remove control box cover. If rigid
conduit is used to route wiring
to outdoor unit, disconnect
power leads at contactor,
remove hardware attaching
conduit to control box and
move conduit out of the way.
DISCHARGE CAPACITORS.
Thermostat wiring can be left intact.
2 – Label and disconnect the three fan
motor leads from control box. Remove
unit top. Note-fan guard/fan/fan motor
is left intact.
3 – On HP23-460 thru -650 models remove panel. Do not disconnect plumbing.
4 – Remove four screws securing plate to control box.
5 – Disconnect and label compressor and crankcase leads. Pull leads into com-
pressor compartment. Disconnect reversing valve wiring harness from re-
versing valve coil. Disconnect High-pressure limit switch/rexet button.
6 – Remove four screws securing control box to outdoor coil. Remove control
box by lifting straight up and out of unit.
7 – Reverse procedures for reassembly.
HP23 SERIES REVERSING VALVE ACCESS
(CONTROL BOX REMOVAL)
FIGURE 16
NOTE-UNIT ELECTRICAL COMPONENTS
AND PLUMBING HAVE BEEN DELETED
FOR CLARITY
III – REFRIGERANT SYSTEM
Refer to figures 17, 18 and 19 for refrigerant
FIGURE 17
EXPANSION
VALVE
EQUALIZER
LINE
DRIER WITH
CHECK VALVE
PRESSURE TAP FITTING
WITH VALVE CORE
DISTRIBUTOR
(TO OUTDOOR COIL)
STRAINER
HP23 LIQUID LINE COMPONENTS
REFRIGERANT
FLOW IN
COOLING
MODE
REFRIGERANT
FLOW IN
HEATING
MODE
TO SENSING
BULB
(TO INDOOR COIL)
DEFROST
THERMOSTAT
(S6)
OUTDOOR
COIL
HP23 COOLING CYCLE (SHOWING GAUGE MANIFOLD CONNECTIONS)
DEFROST THERMOSTAT
EXPANSION VALVE
FILTER / DRIER
WITH INTERNAL CHECK VALVE
STRAINER
TO
R–22
DRUM
SUCTION
HIGH
PRESSURE
COMPRESSOR
REVERSING
VALVE
VAPOR
LINE
VALVE
MUFFLER
CHECK
VALVE
NOTE – ARROWS INDICATE DIRECTION OF
REFRIGERANT FLOW
SERVICE
PORT
SUCTION
FIGURE 18
INDOOR UNIT
OUTDOOR UNIT
LIQUID
LINE
SERVICE
PORT
INDOOR
COIL
THERMOMETER WELL
INTERNAL
COMPRESSOR
LIMIT
EXPANSION
VALVE OR RFCIII
SUCTION
MUFFLER
-141 ONLY
ACCUMULATOR
-141,-460,-510 AND -650 ONLY
HIGH PRESSURE
LIMIT S4
OUTDOOR
COIL
HP23 HEATING CYCLE (SHOWING GAUGE MANIFOLD CONNECTIONS)
DEFROST THERMOSTAT
EXPANSION
VALVE
FILTER / DRIER
WITH INTERNAL
CHECK VALVE
STRAINER
TO
R–22
DRUM
HIGH
PRESSURE
COMPRESSOR
REVERSING
VALVE
VAPOR
LINE
VALVE
MUFFLER
CHECK
VALVE
NOTE – ARROWS INDICATE DIRECTION OF
REFRIGERANT FLOW
SERVICE
PORT
SUCTION
FIGURE 19
INDOOR UNIT
OUTDOOR UNIT
LIQUID
LINE
SERVICE
PORT
INDOOR
COIL
THERMOMETER WELL
INTERNAL
COMPRESSOR
LIMIT
EXPANSION
VALVE OR RFCIII
SUCTION
SUCTION
MUFFLER
-141 ONLY
ACCUMULATOR
-141,-460,-510 AND -650 ONLY
HIGH PRESSURE
LIMIT S4
