Lennox Diplomat 10HP12 Information page 7

5 – Compressor Cover (Figure 11)
A compressor cover
constructed of vinyl-faced
fiberglass is used on all
10HP18 through 10HP60
units. The cover provides an
acoustic barrier. The cover
slides over the compressor
and is held secure with
velcrot straps. Slits are
provided for installation
around the discharge and suction lines.
C – Outdoor Fan Motor
All units use single–phase PSC fan motors which
require a run capacitor. Refer to tables on pages 1 and 2
for specifications of outdoor fans used in the 10HP
series. In all units, the outdoor fan is controlled by the
compressor contactor and defrost relay.
Two different mounting arrangements are used (fan
motor up and fan up) see figures 12 and 13.
OUTDOOR FAN MOTOR AND COMPRESSOR
ACCESS "FAN UP" UNITS (3.5 TONS AND LARGER)
LIFT FAN GUARD OFF AFTER REMOVING SIX SCREWS
Remove (6) screws
Screws
REMOVE SIX SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD
TO ACCESS FAN.
FIGURE 12
OUTDOOR FAN MOTOR AND COMPRESSOR
ACCESS "MOTOR UP" UNITS (3 TONS AND UNDER)
Remove six
FAN GUARD
screws
WIRING
Screws
REMOVE SIX SCREWS SECURING FAN GUARD.
REMOVE FAN GUARD/FAN ASSEMBLY.
FIGURE 13
COMPRESSOR COVER
COVER
SLIT FOR
SUCTION
LINE
VELCROt
STRAPS
COMPRESSOR
SLIT FOR DISCHARGE LINE
FIGURE 11
FAN
SPIDER
MOTOR
MOTOR
FAN
RACEWAY
Access to the outdoor fan motor on all units is gained
by removing the six screws securing the fan guard.
See figures 12 and 13. The outdoor fan motor is
attached to the fan guard on "motor up" units and is
removed with the fan guard. See figure 13.
D - Reversing Valve L1 and Solenoid
A refrigerant reversing valve with electromechanical
solenoid is used to reverse refrigerant flow during unit
operation.
The
maintenance. It is not rebuildable. If the reversing
valve has failed, it must be replaced.
If replacement is necessary, access the reversing valve
by removing the control box. 10HP42 through 10HP60
series units have a filler panel that can also be removed
for reversing valve access. Refer to figure 14 .
10HP 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 10HP42 thru 60 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.
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.
III – REFRIGERANT SYSTEM
Refer to figures 15, 16 and 17 for refrigerant flow in the
heating and cooling modes. The reversing valve is
energized during cooling demand and during defrost.
10HP LIQUID LINE COMPONENTS
DISTRIBUTOR
(TO OUTDOOR COIL)
EXPANSION
VALVE
EQUALIZER
LINE
TO SENSING
BULB
REFRIGERANT
FLOW IN
HEATING
MODE
Page 7
reversing valve requires
FIGURE 14
PRESSURE TAP FITTING
WITH VALVE CORE
DEFROST
THERMOSTAT
(S6)
DRIER WITH
CHECK VALVE
REFRIGERANT
FLOW IN
COOLING
MODE
(TO INDOOR COIL)
FIGURE 15
no