Power Supply; Air Baffles; Accessory Installation - Carrier 50PG20-28 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Orifice Change (48PG Only) -- This unit is
factory
assembled for heating operation using natural gas at aal eleva-
tion lfom sea level to 2000 ft.
Use accessory high altitude kit when installing this unit at
an elevation of 2000 to 7000 ft. For elevations above 7000 ft,
refer to High Altitude section on page 90 to identit) the correct
orifice size for the elevation. Purchase these orifices from your
local Carrier dealei_ Follow instructions in accessory Installa-
tion
Instructions to install the correct orifices.
Use accessory LP (liquid propane) gas conversion kit when
converting this unit for use with LP fuel usage for elevations
up to 7000 ft. For elevations above 7000 ft, ret_r to High
Altitude section on page 90 to identit) the correct orifice size
for the elevation. Purchase these orifices fiom your local
Carrier dealer. Follow instructions in accessory Installation
Instructions to install the correct orifices.
Power Supply -- All 208/230-v units are factory
wired for 230-v power supply. If the 208/230-v unit is to be
connected to a 208-v power supply, the transformers (TRAN 1,
TRAN2 and TRAN3) must be rewired by moving the wire
fiom the 230-volt connection and moving to the 200-volt
terminal on the primary side of the transibnner. Rei}r to unit
label dia_am for additional inforlnation.
Air Baffles -- The 48/50PG units with Humid-MiZer
TM
option are equipped with Motonnastera) control to maintain
adequate discha_e pressure for proper unit operation during
low mnbient operation. Field-fabricated and installed wind bat'-
ties may be required. See Optional Humidi-MiZer Dehmnidifi-
cation System section on page 45.
Accessory Installation -- Check to make sure that all
accessories including space thermostats and sensors have
been installed and wired as required by the instructions and
unit wiring diagrams.
AIRFLOW
(Cfm)
5000
5500
6000
6500
7000
7500
8000
8500
9000
Table 3 -- Fan Performance -- 48PGD020 -- Vertical Supply/Return Units
Rpm
590
633
677
722
767
813
859
906
952
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.8
Bhp
1.47
1.82
2.21
2.67 A
3.17
3.74
4.36
5.05 B
5.81 C
Rpm
663
703
744
786
828
871
915
959
1004
0.4
Bhp
1.74
211
253 A
301
353
412
4.77 B
547
C
625
Rpm
727
764
803
842
883
924
966
1008
1051
0.6
Bhp
201
240
284
333
388
4.48
515
587
667
Rpm
786
820
A 857
894
933
972
B
1012
1053
C
1095
Bhp
2.26
2.67
3.13
3.64
4.21
4.83
5.52
6.26
7.07
1.0
Rpm
840
A 872
907
942
B 979
1017
1056
C 1096
1136
Bhp
252
294
342
3.95
453
518
588
664
747
AIRFLOW
(Cfm)
5000
5500
6000
6500
7000
7500
8000
8500
9000
A
954
988
B
1024
1060
1098
C 1137
1176
1.2
Rpm
891
921
Bhp Rpm
277 940
321 968
370 999
B
425 1032
485 1066
551 1101
623 C 1138
701 1175
786 D 1214
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.8 1.4
Bhp
3.02
3.48
3.99
B
4.55
5.17
5.84
C
6.58
7.38
D
8.24
Rpm
987
1014
1042
1073
1106
1140
1176
1212
1250
1.6
Bhp
3.27
3.74
4.27
4.85
5.48
6.17
6.92
7.74
8.61
Rpm
1032
1057
B
1084
1114
C 1145
1178
1213
D
1248
1285
Bhp
3.52
401
B
455
514
579
650
D
726
809
899
2.0
Rpm Bhp
1076 377
1099 427
1125 483
1153 544
1183 610
1215 682
1249 760
1283 845
1319 9.36
LEGEND
Bhp -- Brake Horsepower Input to Fan
Boldface indicates field-supplied motor/drive required
NOTES:
1 Motor drive ranges:
(A) Low Range: 685-939,426 Bhp (208/230 and 460-v), 751-954,575 Bhp (575-v)
(B) Mid-Low Range: 949-1206, 5.75 Bhp
(C) Mid High Range: 941-1176, 863 Bhp
(D) High Range: 1014-1297, 1150 Bhp
Att other rpms require field-supplied motor or drive
2 See page 30 for general fan performance notes.