Installation, Operation and Maintenance Manual
C13-Series
29
Subject to change without notice.
10.20-IM (0818)
ITEM CODE
PROBLEM
PROBABLE CAUSE
SOLUTION
5
Evaporator coil ices.
Lack of proper air quantity
Low return air temperature
Low refrigerant charge
Check filters: Clean or replace if necessary. Check
for obstruction across coil. Check rotation of evapo-
rator blower to ensure correct rotation of evaporator
blowers.
Raise return air set point or check for short cycling
of supply air.
Check for leaks and repair and recharge the
system.
6
Noisy compressor
Expansion valve stuck in open position
(cold suction line)
Broken compressor valve (compressor
knocking)
Worn or scarred compressor bearings
Liquid slugging
Excessive head pressure
Ensure thermal expansion valve bulb is tight on
suction line. Con- firm that bulb is located properly
on suction line. Check operation and superheat.
Replace compressor.
Replace compressor.
System overcharged. Reclaim excess refrigerant
from the high side of the system
Reduce head pressure (see item 8 below).
7
System short of capacity
Flash gas in liquid line
(bubbles in sight glass)
Expansion valve stuck open or possibly
obstructed
Clogged filter drier
Ice or dirt on evaporator coil
Head pressure control valve not fully open
Condenser coil dirty
Check for leaks. Repair and re- charge the system.
Check sub- cooling.
Replace Valve.
Replace with new filter-drier.
Defrost or clean evaporator coil or replace dirty
filter.
Make sure that the required GPM of water flows
through the condensing section
Clean condenser coil
Содержание C13-Series
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