Vi-Maintenance - Lennox LGH Series Unit Information

Circuit 1 Oil Equalization Port
Circuit 1 Oil Discharge Port
14 - Allow the unit to continue to run in full load for a
minimum of 5 minutes to allow the new oil level
to stabilize. Re-check the oil level of the tandem
compressor assembly.
15 - If oil level is still not visible, close the shut-off valve
on the hose attached to the oil equalization port and
repeat steps 4 - 14 until oil level is in the middle of
the sight glass.
16 - Close the shut-off valve and disconnect hose from
the oil equalization line..
17 - Turn unit off and allow high side and low side
pressures to equalize. Disconnect high side
manifold gauge hose from the common discharge
line.

VI-MAINTENANCE

WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
A-Filters
LGH units use six 24 X 24 X 2" fiberglass throw-away type
filters. Filters may be accessed through the economizer /
filter access door. Filters should be checked monthly (or
more frequently in severe use) and cleaned or replaced
regularly. Take note of the "AIR FLOW DIRECTION" mark-
ing on the filter frame when re-installing.
Circuit 2 Oil Discharge Port
FIGURE 31
B-Lubrication
All motors and blower wheels used in LGH units are lubri-
cated; no further lubrication is required.
C-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove
access panel or to clean blower wheel.
D-Evaporator Coil
Inspect and clean coil at beginning of each season. Clean
using mild detergent or commercial coil cleanser. Check
condensate drain pan and line, if necessary. Flush coil
and condensate drain with water taking care not to get in-
sulation, filters and return air ducts wet. Check connecting
lines and coil for evidence of oil and refrigerant leaks.
E-Condenser Coil
Clean condenser coil annually with detergent or commer-
cial coil cleaner and inspect monthly during the cooling
season. Check connecting lines and coil for evidence of
oil and refrigerant leaks.
F-Electrical
1 - Check all wiring for loose connections.
2 - Check for correct voltage at unit (unit operating).
3 - Check amp-draw on both condenser fan motor and
blower motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
Page 86
Circuit 2 Oil Equalization Port
(not shown, behind compressor 4)