TABLE 21
Manufacturer
Nominal Signal
Microamps
Drop Out
UTEC 0.5 - 1.0
NOTE-If the meter scale reads 0, the leads are reversed.
Disconnect power and reconnect leads for proper polarity.
10-Combustion Air Inducer
adjustable. However, operation should be monitored to
ensure proper operation. The combustion air inducer is
used to draw fresh air into the combustion chamber while
simultaneously expelling exhaust gases. The inducer op-
erates throughout the heating cycle.
On a heating demand, the ignition control is energized by
the A55 Unit Controller. The ignition control then allows
30 to 40 seconds for the combustion air inducer to vent
exhaust gases from the burners. When the combustion
air inducer is purging the exhaust gases, the combustion
air prove switch is closing proving that the combustion air
inducer is operating before allowing the ignition control to
energize.
When the combustion air prove switch is closed and the
B-Cooling System Service Checks
LGM units are factory charged and require no further ad-
using the approach method. The approach method com-
pares actual liquid temperature with the outdoor ambient
temperature. See section III- CHARGING.
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
more frequently in severe use) and cleaned or replaced
regularly. Take note of the “AIR FLOW DIRECTION” mark-
B-Lubrication
All motors and blower wheels used in LGM units are lubri-
C-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
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-
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____
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