035-20401-001 Rev. A (0904)
Unitary Products Group
19
Low Discharge Line Temperature
The control will begin a sixty-minute timer when either of the following
conditions are met.
•
The discharge line temperature has not reached 90F after eight
minutes of accumulated compressor run time.
•
The discharge temperature has not reached 90F after fifteen min-
utes of accumulated compressor run time following the exit of a
defrost cycle.
If the discharge line temperature has not reached 90F after the sixty-
minute timer has expired, the control will cause a soft lockout condition.
The control will reset the sixty-minute timer upon expiration and when
the compressor starts. The timer is reset when the compressor starts
and is only restarted if one of the two conditions shown above are met.
The low discharge temperature fault indicates that the outdoor coil is
too cold during heating operation. The lockout is intended to prevent
refrigerant flooding back to the compressor.
IMPORTANT: The discharge sensor must be well insulated and
installed properly to prevent nuisance lockouts from occurring.
INDICATIONS OF PROPER OPERATION
Cooling
Cooling operation is the same as any conventional air conditioning unit.
1.
The outdoor fan should be running, with warm air being dis-
charged from the top of the unit.
2.
The indoor blower (furnace or air handler) will be operating, dis-
charging cool air from the ducts. Coils or other parts in the air cir-
cuit should be cleaned as often as necessary to keep the unit
clean. Use a brush, vacuum cleaner attachment, or other suitable
means.
3.
The vapor line at the outdoor unit will feel cool to the touch.
4.
The liquid line at the outdoor unit will feel warm to the touch.
Heating
Indications of proper Heating operation is as follows:
1.
The outdoor fan should be running, with cool air being discharged
from the top of the unit.
2.
The indoor blower (furnace or air handler) will be operating, dis-
charging warm air from the ducts.
3.
The vapor line at the outdoor unit will feel warm to the touch.
4.
The liquid line at the outdoor unit will feel cool to the touch.
SECTION IX: INSTRUCTING THE OWNER
Assist owner with processing warranty cards and/or online registration.
Review Owners Guide and provide a copy to the owner and guidance
on proper operation and maintenance. Instruct the owner or the opera-
tor how to start, stop and adjust temperature setting.
When applicable, instruct the owner that the compressor is equipped
with a crankcase heater to prevent the migration of refrigerant to the
compressor during the “OFF” cycle. The heater is energized only when
the unit is not running. If the main switch is disconnected for long peri-
ods of shut down, do not attempt to start the unit until 8 hours after the
switch has been connected. This will allow sufficient time for all liquid
refrigerant to be driven out of the compressor.
The installer should also instruct the owner on proper operation and
maintenance of all other system components.
MAINTENANCE
1.
Dirt should not be allowed to accumulate on the outdoor coils or
other parts in the air circuit. Clean as often as necessary to keep
the unit clean. Use a brush, vacuum cleaner attachment, or other
suitable means.
2.
The outdoor fan motor is permanently lubricated and does not
require periodic oiling.
3.
If the coil needs to be cleaned, it should be washed with Calgon
Coilclean (mix one part Coilclean to seven parts water). Allow
solution to remain on coil for 30 minutes before rinsing with clean
water. Solution should not be permitted to come in contact with
painted surfaces.
4.
Refer to the furnace or air handler instructions for filter and blower
motor maintenance.
5.
The indoor coil and drain pan should be inspected and cleaned
regularly to prevent odors and assure proper drainage.
IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-
CHARGE REFRIGERANT INTO THE OPEN AIR DURING
REPAIR, SERVICE, MAINTENANCE OR THE FINAL DIS-
POSAL OF THIS UNIT.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND
THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE
THE OWNER’S APPROVAL.
TABLE 12:
R-410A Saturation Properties
TEMP.
°
F
PRESSURE
PSIG
TEMP.
°
F
PRESSURE
PSIG
TEMP.
°
F
PRESSURE
PSIG
TEMP.
°
F
PRESSURE
PSIG
TEMP.
°
F
PRESSURE
PSIG
45
129.70
60
169.60
75
217.40
90
274.10
105
340.50
46
132.20
61
172.60
76
220.90
91
278.20
106
345.30
47
134.60
62
175.50
77
224.40
92
282.30
107
350.10
48
137.10
63
178.50
78
228.00
93
286.50
108
355.00
49
139.60
64
181.60
79
231.60
94
290.80
109
360.00
50
142.20
65
184.60
80
235.30
95
295.10
110
365.00
51
144.80
66
187.70
81
239.00
96
299.40
111
370.00
52
147.40
67
190.90
82
242.70
97
303.80
112
375.10
53
150.10
68
194.10
83
246.50
98
308.20
113
380.20
54
152.80
69
197.30
84
250.30
99
312.70
114
385.40
55
155.50
70
200.60
85
254.10
100
317.20
115
390.70
56
158.20
71
203.90
86
258.00
101
321.80
116
396.00
57
161.00
72
207.20
87
262.00
102
326.40
117
401.30
58
163.90
73
210.60
88
266.00
103
331.00
118
406.70
59
166.70
74
214.00
89
270.00
104
335.70
119
412.20
