Manual 2100-483E
Page
40 of 59
START UP
These units require R-410A refrigerant & Polyol Ester oil.
APPLICATION:
1. Use separate service and manufacturing equipment
to avoid cross contamination of oil and refrigerants.
2. Use recovery equipment rated for R-410A
refrigerant.
3. Use manifold gauges rated for R-410A (800 psi/
250 psi low).
4. R-410A is a binary blend of HFC-32 and HFC-125.
5. R-410A is nearly azeotropic - similar to R-22 and
R-12. Although nearly azeotropic, charge with
liquid refrigerant.
6. R-410A operates at 40-70% higher pressure than
R-22, and systems designed for R-22 cannot
withstand this higher pressure.
7. R-410A has an ozone depletion potential of zero,
but must be reclaimed due to its global warming
potential.
8. R-410A compressors use Polyol Ester oil.
9. Polyol Ester oil is hygroscopic; it will rapidly
absorb moisture and strongly hold this moisture in
the oil.
10. A liquid line dryer must be used - even a deep
vacuum will not separate moisture from the oil.
11. Limit atmospheric exposure to 15 minutes -
MAXIMUM
.
12. If compressor removal is necessary, always plug
compressor immediately after removal. Purge with
small amount of nitrogen when inserting plugs.
IMPORTANT INSTALLER NOTE
For improved start-up performance, wash the indoor
coil with a dishwasher detergent.
CRANKCASE HEATERS
All units covered in this manual are provided with
compressor crankcase heat.
This crankcase heater is a band type heater located
around the bottom of the compressor. This heater is
controlled by the auxiliary contacts on the side of the
compressor contactor. The heater is only energized
when the compressor is not running.
Crankcase heat is essential to prevent liquid refrigerant
from migrating to the compressor, preventing oil pump
out on compressor start-up and possible bearing or
scroll vane failure due to compressing a liquid.
The decal in Figure 18 is affixed to all model units
detailing start-up procedure. This is very important.
Please read carefully
.
IMPORTANT
These procedures must be followed at
initial start-up and at any time power
has been removed for 12 hours or
longer.
To prevent compressor damage which may
result from the presence of liquid refrigerant
in the compressor crankcase.
1. Make certain the room thermostat is in
the "off" position (the compressor is
not to operate).
2. Apply power by closing the system
disconnect switch. This energizes the
compressor heater which evaporates
the liquid refrigerant in the crankcase.
3. Allow 4 hours or 60 minutes per pound
of refrigerant in the system as noted
on the unit rating plate, whichever is
greater.
4. After properly elapsed time, the
thermostat may be set to operate the
compressor.
5. Except as required for safety while
servicing –
Do not open system
disconnect switch.
7961-061
FIGURE 18
START-UP LABEL
HIGH & LOW PRESSURE SWITCH
All models covered by this Manual are supplied with a
remote reset high pressure switch and low pressure
switch. If tripped, this pressure switch may be reset by
turning the thermostat off then back on again.
Summary of Contents for WG3S1-A
Page 11: ...Manual 2100 483E Page 11 of 59 FIGURE 2A MOUNTING INSTRUCTIONS FOR WG3S1 ...
Page 12: ...Manual 2100 483E Page 12 of 59 FIGURE 2B MOUNTING INSTRUCTIONS FOR WG4S1 AND WG5S1 ...
Page 15: ...Manual 2100 483E Page 15 of 59 FIGURE 6 COMMON WALL MOUNTING INSTALLATIONS ...
Page 25: ...Manual 2100 483E Page 25 of 59 FIGURE 11 GAS PIPE CONNECTION ...
