Справочник Пользователя для Carrier 50ZHA024-060
SIZE
RATED AIRFLOW
HIGH AIRFLOW
Low
Stage
High
Stage
Low
Stage
High
Stage
048
Tap 1
Tap 3
Tap 2
Tap 4
060
Tap 1
Tap 3
Tap 2
Tap 4
Step 5—Unit Controls
All compressors have the following internal-protection controls.
HIGH-PRESSURE RELIEF VALVE
This valve opens when the pressure differential between the low
and high side becomes excessive.
and high side becomes excessive.
LOSS OF CHARGE SWITCH
Located on the outdoor liquid line is a low-pressure switch which
functions as a loss-of-charge switch. This switch contains a
Schrader core depressor. This switch opens at 7 psig and closes at
22 psig. No adjustment is necessary.
functions as a loss-of-charge switch. This switch contains a
Schrader core depressor. This switch opens at 7 psig and closes at
22 psig. No adjustment is necessary.
COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when either the
current or internal temperature become excessive, and automati-
cally resets when the internal temperature drops to a safe level.
current or internal temperature become excessive, and automati-
cally resets when the internal temperature drops to a safe level.
This overload may require up to 60 minutes (or longer) to reset;
therefore, if the internal overload is suspected of being open,
disconnect the electrical power to the unit and check the circuit
through the overload with an ohmmeter or continuity tester.
therefore, if the internal overload is suspected of being open,
disconnect the electrical power to the unit and check the circuit
through the overload with an ohmmeter or continuity tester.
Step 6—Sequence of Operation
FAN OPERATION
The FAN switch on the thermostat controls indoor fan operation.
When the FAN switch is placed in the ON position, the IFR
(indoor-fan relay) is energized through the G terminal on the
thermostat. The normally-open contacts close, which then provide
power to the indoor (evaporator) fan motor (IFM). The IFM will
run continuously when the FAN switch is set to ON.
When the FAN switch is placed in the ON position, the IFR
(indoor-fan relay) is energized through the G terminal on the
thermostat. The normally-open contacts close, which then provide
power to the indoor (evaporator) fan motor (IFM). The IFM will
run continuously when the FAN switch is set to ON.
When the FAN switch is set to AUTO, the thermostat deenergizes
the IFR (provided there is not a call for cooling). The contacts open
and the IFM is deenergized. The IFM will be energized only when
there is a call for cooling, in heat pump heating mode or if the unit
is equipped with accessory electric heat, the indoor-fan motor will
also run while the accessory electric heat is energized.
the IFR (provided there is not a call for cooling). The contacts open
and the IFM is deenergized. The IFM will be energized only when
there is a call for cooling, in heat pump heating mode or if the unit
is equipped with accessory electric heat, the indoor-fan motor will
also run while the accessory electric heat is energized.
NOTE: Some units are equipped with a time-delay relay. On
these units, the indoor fan remains on for 30 seconds after G or Y
is deenergized.
these units, the indoor fan remains on for 30 seconds after G or Y
is deenergized.
Table 7—Dry Coil Air Delivery* Horizontal Discharge
(Deduct 10 percent for 208 Volt Operation)
50ZHA
SPEED TAP
WATTS/C.F.M
EXTERNAL STATIC PRESSURE
0.1
0.2
.03
0.4
0.5
0.6
0.7
0.8
0.9
1.0
024
1
Watts
-
99
100
118
130
142
-
-
-
-
C.F.M.
-
848
793
757
698
632
-
-
-
-
2
Watts
-
-
-
-
-
222
233
244
257
260
C.F.M
-
-
-
-
-
970
918
861
795
729
030
2
Watts
-
155
146
157
170
-
-
-
-
-
C.F.M
-
1108
995
951
884
-
-
-
-
-
3
Watts
-
-
-
-
-
261
275
286
291
315
C.F.M.
-
-
-
-
-
1117
1053
1014
980
877
036
1
Watts
180
166
179
191
204
216
-
-
-
-
C.F.M.
1344
1215
1172
1136
1095
1051
-
-
-
-
2
Watts
-
-
-
261
276
290
301
316
329
342
C.F.M.
-
-
-
1343
1304
1272
1234
1190
1148
1100
042
3
Watts
269
283
305
321
336
349
360
-
-
-
C.F.M.
1440
1404
1369
1333
1301
1273
1239
-
-
-
4
Watts
-
-
418
432
450
465
480
490
503
518
C.F.M.
-
-
1572
1543
1504
1475
1441
1418
1380
1332
048
1
Watts
—
204
209
216
229
236
249
—
—
—
C.F.M.
—
1129
1087
1027
994
932
881
—
—
—
2
Watts
—
—
233
245
254
266
276
289
—
—
C.F.M.
—
—
1164
1122
1066
1025
954
906
—
—
3
Watts
386
398
409
418
425
435
438
441
451
—
C.F.M.
1680
1652
1625
1583
1555
1515
1477
1444
1403
—
4
Watts
—
440
448
457
462
469
477
480
485
486
C.F.M.
—
1745
1717
1684
1651
1612
1573
1537
1508
1470
060
1
Watts
224
235
251
266
277
291
298
-
-
-
C.F.M.
1334
1288
1259
1224
1181
1157
1117
-
-
-
2
Watts
-
-
286
301
311
325
333
344
370
-
C.F.M.
-
-
1333
1296
1261
1232
1199
1170
1062
-
3
Watts
608
626
643
660
668
685
697
-
-
-
C.F.M.
1931
1900
1878
1844
1817
1789
1755
-
-
-
4
Watts
737
755
770
787
799
817
826
812
782
-
C.F.M.
2093
2061
2028
2001
1971
1934
1899
1850
1757
-
Air delivery values are based on operating voltage of 230-v., dry coil, without filter or electric heater. Deduct wet coil, filter, and electric heater pressure drops to obtain
external static pressure availabe for ducting.
Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below
this point.
Dashes indicate portions of the table that are beyond the blower motor capacity or are not recommended.
external static pressure availabe for ducting.
Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below
this point.
Dashes indicate portions of the table that are beyond the blower motor capacity or are not recommended.
13