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7
Orifice Change (48PG Only) —
This unit is factory
assembled for heating operation using natural gas at an eleva-
tion from 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 identify the correct
orifice size for the elevation. Purchase these orifices from your
local Carrier dealer. 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, refer to High
Altitude section on page 90 to identify the correct orifice size
for the elevation. Purchase these orifices from 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 (TRAN1,
TRAN2 and TRAN3) must be rewired by moving the wire
from the 230-volt connection and moving to the 200-volt
terminal on the primary side of the transformer. Refer to unit
label diagram for additional information.
Air Baffles —
The 48/50PG units with Humid-MiZer™
option are equipped with Motormaster® control to maintain
adequate discharge pressure for proper unit operation during
low ambient operation. Field-fabricated and installed wind baf-
fles may be required. See Optional Humidi-MiZer Dehumidifi-
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.
Table 3 — Fan Performance — 48PGD020 — Vertical Supply/Return Units
LEGEND
Boldface indicates field-supplied motor/drive required.
NOTES:
1. Motor drive ranges:
(A) Low Range: 685-939, 4.26 Bhp (208/230 and 460-v), 751-954, 5.75 Bhp (575-v)
(B) Mid-Low Range: 949-1206, 5.75 Bhp
(C) Mid High Range: 941-1176, 8.63 Bhp
(D) High Range: 1014-1297, 11.50 Bhp
All other rpms require field-supplied motor or drive.
2. See page 30 for general fan performance notes.
AIRFLOW
(Cfm)
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.2
0.4
0.6
0.8
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
5000
590
1.47
663
1.74
727
2.01
786
2.26
840
2.52
5500
633
1.82
703
2.11
764
2.40
820
2.67
872
2.94
6000
677
2.21
744
2.53
803
2.84
857
3.13
907
3.42
6500
722
2.67
786
3.01
842
3.33
894
3.64
942
3.95
7000
767
3.17
828
3.53
883
3.88
933
4.21
979
4.53
7500
813
3.74
871
4.12
924
4.48
972
4.83
1017
5.18
8000
859
4.36
915
4.77
966
5.15
1012
5.52
1056
5.88
8500
906
5.05
959
5.47
1008
5.87
1053
6.26
1096
6.64
9000
952
5.81
1004
6.25
1051
6.67
1095
7.07
1136
7.47
AIRFLOW
(Cfm)
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.2
1.4
1.6
1.8
2.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
5000
891
2.77
940
3.02
987
3.27
1032
3.52
1076
3.77
5500
921
3.21
968
3.48
1014
3.74
1057
4.01
1099
4.27
6000
954
3.70
999
3.99
1042
4.27
1084
4.55
1125
4.83
6500
988
4.25
1032
4.55
1073
4.85
1114
5.14
1153
5.44
7000
1024
4.85
1066
5.17
1106
5.48
1145
5.79
1183
6.10
7500
1060
5.51
1101
5.84
1140
6.17
1178
6.50
1215
6.82
8000
1098
6.23
1138
6.58
1176
6.92
1213
7.26
1249
7.60
8500
1137
7.01
1175
7.38
1212
7.74
1248
8.09
1283
8.45
9000
1176
7.86
1214
8.24
1250
8.61
1285
8.99
1319
9.36
Bhp —
Brake Horsepower Input to Fan
A
A
A
A
A
B
B
B
C
C
C
C
C
B
A
B
C
D
B
B
B
B
C
C
C
D
D
D
Summary of Contents for 48PG24
Page 68: ...68 Fig 14 Low Voltage Control Schematic 48PG20 28 Units without Humidi MiZer System a48 7627...
Page 69: ...69 Fig 15 Low Voltage Control Schematic 48PG20 28 Units with Humidi MiZer System a48 8227...
Page 70: ...70 Fig 16 Low Voltage Control Schematic 50PG20 28 Units without Humidi MiZer System a48 7778...
Page 71: ...71 Fig 17 Low Voltage Control Schematic 50PG20 28 Units with Humidi MiZer System a50 8101...
Page 72: ...72 Fig 18 Power Schematic Units without Humidi MiZer System a48 7628...
Page 73: ...73 Fig 19 Power Schematic Units with Humidi MiZer System a48 8228...
Page 74: ...74 Fig 20 Component Arrangement Units without Humidi MiZer System a48 8229...
Page 75: ...75 Fig 21 Component Arrangement Units with Humidi MiZer System a48 8230...
Page 105: ......