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5−
180S & H, 210S, 240S,−
First−stage thermostat demand will energize condens-
er fans 1 and 2. Second−stage thermostat demand will
energize condenser fans 3 and 4. Fans will continue to
operate with additional thermostat demands.
210H, 240H, 300S −
First−stage thermostat demand will energize condens-
er fans 1 and 2. See figure 18. Third−stage thermostat
demand will energize condenser fans 3 and 4.
CONDENSER FANS
FIGURE 18
COND.
FAN 2
COND.
FAN 1
COND.
FAN 4
COND.
FAN 3
1
2
3
4
evaporator coil
compressors
6− Each refrigerant circuit is separately charged with
HCFC22 refrigerant. See unit rating plate for correct
amount of charge.
7− Refer to Cooling Operation and Adjustment section for
proper method to check refrigerant charge.
IV−CHARGING
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in person-
al injury or death.
WARNING−Do not exceed nameplate charge under any
condition.
This unit is factory charged and should require no further
adjustment. If the system requires charge,
reclaim the
charge,
evacuate the system,
and
add required nameplate
charge.
NOTE − System charging is not recommended below 60°F
(15°C). In temperatures below 60°F (15°C) ,
the charge
must
be weighed into the system.
If weighing facilities are not available, or to check the
charge, use the following procedure:
1− Attach gauge manifolds and operate unit in cooling
mode until system stabilizes (approximately five min-
utes). Make sure outdoor air dampers are closed.
2− Check each system separately with all stages operat-
ing.
3− Use a thermometer to accurately measure the outdoor
ambient temperature.
4− Apply the outdoor temperature to tables 9 through 15
to determine normal operating pressures.
5− Compare the normal operating pressures to the pres-
sures obtained from the gauges. Minor variations in
these pressures may be expected due to differences
in installations. Significant differences could mean that
the system is not properly charged or that a problem
exists with some component in the system.
Correct
any system problems before proceeding.
6− If discharge pressure is high, remove refrigerant from
the system. If discharge pressure is low, add refriger-
ant to the system.
S
Add or remove charge in increments.
S
Allow the system to stabilize each time refrigerant
is added or removed.
7− Use the following approach method along with the nor-
mal operating pressures to confirm readings.
TABLE 9
TCA180S NORMAL OPERATING PRESSURES
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
Dis.
+10
psig
Suc.
+5
psig
Dis.
+10
psig
Suc.
+5
psig
Dis.
+10
psig
Suc.
+5
psig
65°F
172
75
178
78
181
78
75°F
199
77
205
80
210
80
85°F
228
79
237
82
242
81
95°F
258
80
271
83
274
82
105°F
293
82
309
84
312
84
115°F
331
83
348
85
350
85
TABLE 10
TCA180H NORMAL OPERATING PRESSURES
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
Dis.
+10
psig
Suc.
+5
psig
Dis.
+10
psig
Suc.
+5
psig
Dis.
+10
psig
Suc.
+5
psig
65°F
158
72
159
74
158
74
75°F
183
76
186
79
184
78
85°F
210
78
214
81
211
79
95°F
239
79
245
83
241
81
105°F
270
81
278
84
273
82
115°F
304
82
313
86
306
84
TABLE 11
TCA210S NORMAL OPERATING PRESSURES
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
Dis.
+10
psig
Suc.
+5
psig
Dis.
+10
psig
Suc.
+5
psig
Dis.
+10
psig
Suc.
+5
psig
65°F
188
66
191
67
194
71
75°F
213
69
217
70
220
73
85°F
242
71
247
74
252
74
95°F
275
73
281
76
286
76
105°F
308
75
315
77
321
77
115°F
347
77
355
79
361
79
