Installation, Operation and Maintenance Manual
VertiCool Classic
25
Subject to change without notice.
20.10-IM (0617)
PROBLEM
POSSIBLE CAUSE
POSSIBLE SOLUTION
Evaporator
coil ices
1.
Lack of air flow
2.
Low return air temperature
3.
Loss of refrigerant charge
4.
VFD not functioning properly
1.
Check filters and coil for any blockages
2.
Replace filters if dirty
3.
Verify that blower is rotating in the proper direction
4.
Make sure that supply air is not short cycling back into return
air stream
5.
Repair leak, evacuate and recharge refrigerant system
6.
Confirm VFD programming and operation
Noisy
compressor
1.
Expansion valve stuck open
2.
Worn or scarred compressor
bearings
3.
Excessive head pressure
4.
Broken compressor valve
(compressor knocking)
5.
Liquid slugging
1.
Ensure thermal expansion valve bulb is tight on suction line
2.
Confirm thermal expansion valve bulb is located properly on
suction line
3.
Check superheat
4.
Replace compressor
5.
Reduce head pressure
6.
System overcharged� Reclaim excess refrigerant from the
high side of the system�
System short
of capacity
1.
Flash gas in liquid line
2.
Expansion valve stuck open or
possibly obstructed
3.
Clogged filter drier
4.
Iced or clogged evaporator coil
5.
Head pressure control valve not
operating properly
6.
Condenser needs cleaned
1.
Check for refrigerant leaks
2.
Repair leak, evacuate and recharge refrigerant system
3.
Check sub-cooling
4.
Ensure thermal expansion valve bulb is tight on suction line
5.
Confirm thermal expansion valve bulb is located properly on
suction line
6.
Replace thermal expansion valve
7.
Replace filter drier
8.
Check filters and coil for any blockages
9.
Replace filters if dirty
10.
Verify that blower is rotating in the proper direction
11.
Confirm proper fluid flow quantity through condenser
12.
Confirm acceptable fluid temperatures entering the condenser
13.
Clean condenser
Head
pressure
too high
1.
Possible non-condensable in
system
2.
Overcharge of refrigerant
3.
Condenser water flow not
adequate
4.
Condenser entering fluid
temperature too hot
5.
Condenser air intake, duct or
coil blocked�
6.
Condenser blower not operating
or running backwards�
1.
Repair leak, evacuate and recharge refrigerant system�
Install new filter drier.
2.
Reclaim excess refrigerant from high side of system
3.
Confirm proper fluid flow quantity through condenser
4.
Confirm acceptable fluid temperatures entering the condenser
5.
Verify that head pressure control valve is operational
6.
Reset high pressure safety switch if tripped
7.
Clean away debris from condenser air circuit�
8.
Check phase of incoming power to unit (3 ph units only)�
Reverse any two incoming power supply wires (except
ground)�
Head
pressure
too low
1.
Condenser water flow too high
2.
Entering fluid temperature too
low
3.
Excessive air flow across
condenser�
1.
Confirm proper fluid flow quantity through condenser
2.
Confirm acceptable fluid temperatures entering the condenser
3.
Confirm proper air flow amount. Adjust blower drive package
as necessary�
Содержание VertiCool CLASSIC
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