35
NOTE:
Always replace oil with new fresh oil taken
from a sealed container only.
NOTE:
Always replace the system filter drier anytime
the system has been opened for service.
A severely contaminated system may be indicated by
black oil in the compressor. If severe contamination
occurs, it will be necessary to flush the complete
system. If flushing is required, use industry approved
materials.
In all cases when this occurs you must determine the
extent of contamination. Do this by removing the
filter-drier and determine if the darker colored oil is
present at that point of the system too. If it is, flushing
the system is recommended.
If the oil appears clean at the filter drier, install a new
filter drier and replace the compressor with new oil.
4.12 HOT GAS & CONDENSER SOLENOID
VALVE & COILS
4.12.1 Diagnosis of solenoid coils
Symptoms for z120:
Unit is not heating or defrosting correctly in mode
correct refrigerant charge good compressor capacity
QUICK CHECK:
Using a small metal screw driver and
coil removed. See if it magnetizes with power.
NOTE:
Although the coil is creating a magnetic field. It
is still possible that the coil is not strong enough to
control the internal valve and will need to be check
for correct ohms. (Step 6.)
1.
Make sure hot gas solenoid and condenser
solenoid are getting 12vdc power and
ground while in heat/ defrost mode (If
receiving power skip to step 6 )
2.
No power and/or ground at solenoid,
proceed with following steps
3.
Follow schematic to relay board at pins
26+ and NE- beside it. If you are
receiving power and ground. You have a
break in the harness.
4.
No ground from board pin NE-
a.
Check connection and ohms from
frame ground to NE-
b.
If Pin NE- is not receiving a ground
from the board, replace board
5.
No power from board pin 26+
a.
Check FSS fuse condition.
b.
If it is not blown and receiving 12vdc
(skip to step 7)
6.
If fuse is blown (FSS)
a.
Check Power wire for ground
continuity, short, or corrosion.
b.
Repair as needed
c.
Replace fuse. If it blows again,
Replace board
7.
Check K11 relay Replace if bad.
a.
If relay socket is not receiving
correct voltages and grounds,
replace board
8.
Ohm check of solenoid coils
a.
Condenser solenoid ohms should be
07.20 Ω ± 5%
- if not within range replace coil
b.
Defrost solenoid ohms should be
10.00Ω ± 5%
- if not within range
replace coil
4.12.3 Diagnosis of solenoid valves
Symptoms: Not heating efficiently (while
cooling correctly)
Cause
: Stuck open Condenser Inlet Valve
What it does: The Condenser Inlet Valve is a normally open
valve. During heat of defrost it closes to block the
refrigerant from entering the condenser and piping it
directly into the evaporator.
If the valve is stuck open. the whole refrigeration circuit is
now circulating.
Diagnosis:
Install gauge hose to High side and low side port, and
added compressor head port.
Run unit in heat. Allow discharge pressure to drop.
Verify that the pressure between the Head port and High
Содержание Zer0 120
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Страница 15: ...8 Figure 1 Z120 Condensing Section Components ...
