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ENTERING LOAD/
EVAP TEMP (°F)
65
55
45
ENTERING LOAD TEMP (°F)
70
90
110
Minimum ambient air temperature °F
Maximum ambient air temperature °F
Minimum entering load fluid temperature °F
Typical entering load fluid temperature °F
Maximum entering load fluid temperature °F
Minimum entering source fluid temperature °F
Water loop typical entering source fluid range temperature °F
Maximum entering source fluid temperature °F
Minimum ambient air temperature °F
Maximum ambient air temperature °F
Minimum entering load fluid temperature °F
Typical entering load fluid temperature °F
Maximum entering load fluid temperature °F
Minimum entering source fluid temperature °F
Water loop typical entering source fluid range temperature °F
Maximum entering source fluid temperature °F
NOTE(S):
a. Antifreeze solution is required at these fluid temperatures.
b. Maximum and minimum fluid conditions are at unit rated air flow.
c. Maximum and minimum operating limits may not be combined. If one value is at either maximum or minimum, the other value(s) must be within normal operating range.
Scroll Compressor Rotation
It is important to be certain the compressor is rotating in the proper
direction. To determine whether or not compressor is rotating in
the proper direction:
1.
Connect service gauges to suction and discharge pressure
fittings.
2.
Energize the compressor.
3.
The suction pressure should drop and the discharge pressure
should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:
1.
Turn off power to the unit. Install disconnect tag.
2.
Reverse any two of the unit power leads.
3.
Reapply power to the unit and verify pressures are correct.
The suction and discharge pressure levels should now move
to their normal start-up levels.
Table 6 — Cooling Mode Operating Pressure (psig)
ENTERING SOURCE CONDENSER TEMPERATURE (°F)
75°F
SUCTION
DISCHARGE
PRESSURE
PRESSURE
99-116
290-320
91-107
265-311
76- 91
265-311
Table 7 — Heating Mode Operating Pressure (psig)
ENTERING SOURCE CONDENSER TEMPERATURE (°F)
40°F
SUCTION
DISCHARGE
PRESSURE
PRESSURE
68-83
255-290
76-91
350-380
76-91
455-480
Table 8 — 50PSW Unit Operating Limits
COOLING
HEATING
85°F
SUCTION
DISCHARGE
PRESSURE
PRESSURE
107-123
325-358
91-107
303-350
76- 91
295-345
60°F
SUCTION
DISCHARGE
PRESSURE
PRESSURE
99-116
270-305
99-116
358-390
99-116
470-500
When the compressor is rotating in the wrong direction, the
unit makes an elevated level of noise and does not provide
cooling. Damage to compressor will occur if allowed to
operate in this manner.
After a few minutes of reverse operation, the scroll compressor
internal overload protection will open, thus activating the unit
lockout. This requires a manual reset. To reset, turn the thermostat
on and then off.
NOTE: There is a 5-minute time delay before the compressor will
start.
24
95°F
SUCTION
DISCHARGE
PRESSURE
PRESSURE
107-123
370-400
99-116
370-400
83-99
358-390
80°F
SUCTION
DISCHARGE
PRESSURE
PRESSURE
130-145
290-325
130-165
370-400
139-165
480-575
°F
50
100
50
55
90
50
70-90
110
°F
50
100
60
100-110
120
30
abc
50-70
90
CAUTION
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