Refrigerant System - Lennox HP23 Series Manual

HP23 SERIES REVERSING VALVE ACCESS
(CONTROL BOX REMOVAL)
NOTE-UNIT ELECTRICAL COMPONENTS
AND PLUMBING HAVE BEEN DELETED
FOR CLARITY
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.
FIGURE 16
HP23 COOLING CYCLE (SHOWING GAUGE MANIFOLD CONNECTIONS)
DEFROST THERMOSTAT
EXPANSION VALVE
FILTER / DRIER
WITH INTERNAL CHECK VALVE
HIGH
SUCTION PRESSURE
TO
R–22
DRUM
HP23 HEATING CYCLE (SHOWING GAUGE MANIFOLD CONNECTIONS)
DEFROST THERMOSTAT
EXPANSION
VALVE
FILTER / DRIER
WITH INTERNAL
CHECK VALVE
STRAINER
HIGH
SUCTION PRESSURE
TO
R–22
DRUM
OUTDOOR
INTERNAL
STRAINER
COMPRESSOR
HIGH PRESSURE
LIMIT S4
MUFFLER
LIQUID
LINE
SERVICE
COMPRESSOR
PORT
THERMOMETER WELL
FIGURE 18
OUTDOOR
INTERNAL
COMPRESSOR
HIGH PRESSURE
LIMIT S4
MUFFLER
LIQUID
LINE
SERVICE
COMPRESSOR
PORT
THERMOMETER WELL
FIGURE 19
III – REFRIGERANT SYSTEM
Refer to figures 17, 18 and 19 for refrigerant flow in the
heating and cooling modes. The reversing valve is
energized during cooling demand and during defrost.
HP23 LIQUID LINE COMPONENTS
DISTRIBUTOR
(TO OUTDOOR COIL)
EXPANSION
VALVE
EQUALIZER
LINE
TO SENSING
BULB
REFRIGERANT
FLOW IN
HEATING
MODE
REVERSING
COIL
VALVE
SUCTION
LIMIT SERVICE
PORT
VAPOR
SUCTION
LINE
MUFFLER
VALVE
-141 ONLY
ACCUMULATOR
-141,-460,-510 AND -650 ONLY
REVERSING
VALVE
COIL
LIMIT
SUCTION
SERVICE
PORT
VAPOR
SUCTION
LINE
MUFFLER
VALVE
-141 ONLY
ACCUMULATOR
-141,-460,-510 AND -650 ONLY
Page 9
PRESSURE TAP FITTING
WITH VALVE CORE
DEFROST
THERMOSTAT
(S6)
DRIER WITH
CHECK VALVE
REFRIGERANT
FLOW IN
COOLING
MODE
(TO INDOOR COIL)
FIGURE 17
OUTDOOR UNIT
NOTE – ARROWS INDICATE DIRECTION OF
REFRIGERANT FLOW
INDOOR UNIT
CHECK
VALVE
INDOOR
COIL
EXPANSION
VALVE OR RFCIII
OUTDOOR UNIT
NOTE – ARROWS INDICATE DIRECTION OF
REFRIGERANT FLOW
INDOOR UNIT
CHECK
VALVE
INDOOR
COIL
EXPANSION
VALVE OR RFCIII