Controls Quick Start; Thermostat Control; Space Temperature Sensor Control - Direct Wired (T-55 Or T-56); Space Temperature Sensor Control - Ccn (T-58) - Carrier 48PG20 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

50PG DRIVE
Low Range Vertical
Mid-Low Range Vertical
Mid-High Range Vertical
20 and 24
High Range Vertical
(230 and
Low Range Horizontal
460 volt)
Mid-Low Range Horizontal
Mid-High Range Horizontal
High Range Horizontal
Low Range Vertical
Mid-Low Range Vertical
Mid-High Range Vertical
High Range Vertical
20 and 24
(575 Volt)
Low Range Horizontal
Mid-Low Range Horizontal
Mid-High Range Horizontal
High Range Horizontal
Low Range Vertical
Mid-Low Range Vertical
Mid-High Range Vertical
High Range Vertical
28
(all voltages)
Low Range Horizontal
Mid-Low Range Horizontal
Mid-High Range Horizontal
High Range Horizontal
*Approximate fan rpm shown.
NOTE: Factory pulley speed setting is at 3 turns open.

CONTROLS QUICK START

The following information will provide a quick guide to
setting up and configuring the 48/50PG series units with
ComfortLink™ controls. Unit controls are pre-configured at
the factory for factory-installed options. Field-installed acces-
sories will require configuration at start-up. Additionally,
specific job requirements may require changes to default
configuration values. See the CCN and Display parameter
tables and other sections of these instructions for more details.
Thermostat Control —
the corresponding R, Y1, Y2, W1, W2, and G terminals on the
field connection terminal board located at the unit control box.
The Unit Control Type configuration, Configuration
→ →
UNIT U.CTL, default value is for Thermostat (2) so there
is no need to configure this item.
Space Temperature Sensor Control — Direct
Wired (T-55 or T-56) —
ture sensor(s) to the T-55 terminals on the field connection
terminal board located at the unit control box. Refer to Field-
Installed Accessories section.
The Unit Control Type configuration, Configuration
→ →
UNIT U.CTL, must be set to Space Sensor (3). The jumper
wire in the installer's packet must be connected between R and
W1 for heating mode to operate.
Space Temperature Sensor Control — CCN
Install the T-58 communicating thermostat. Con-
(T-58) —
nect the CCN communication bus from the T-58 to the CCN
terminals on the field connection terminal board located at the
unit control box. Configure the 48/50PG unit CCN communi-
cation element number, bus number, and baud rate. Configure
the T-58 thermostat CCN communication element number and
also configure the T-58 with the 48/50PG unit element number.
The Unit Control Type configuration, Configuration
→ →
UNIT U.CTL, must be set to Space Sensor (3). The jumper
wire in the installer's packet must be connected between R and
W1 for heating mode to operate.
Space Temperature Control — CCN Link-
The CCN communication must be properly configured
age —
for the 48/50PG unit and all devices. Linkage configuration is
automatically done by the supervisory CCN Linkage device.
The Unit Control Type configuration, Configuration
→ →
UNIT U.CTL must be set to Space Sensor (3). The jumper
Table 34 — Fan Rpm At Motor Pulley Settings* — 50PG20-28
0 1 /
2
685 706
949 970
941 961
1014 1038
685 706
949 970
941 961
1014 1038
751 768
949 970
941 961
1014 1038
751 768
949 970
941 961
1014 1038
687 703
805 822
941 961
1014 1038
687 703
805 822
941 961
1014 1038
Wire accessory thermostat to
Wire accessory space tempera-
MOTOR PULLEY TURNS OPEN
1 1 1 / 2 2 1 /
2 2
727 749 770 791
992 1013 1035 1056 1078
980 1000 1019 1039 1059
1061 1085 1108 1132 1156
727 749 770 791
992 1013 1035 1056 1078
980 1000 1019 1039 1059
1061 1085 1108 1132 1156
785 802 819 836
992 1013 1035 1056 1078
980 1000 1019 1039 1059
1061 1085 1108 1132 1156
785 802 819 836
992 1013 1035 1056 1078
980 1000 1019 1039 1059
1061 1085 1108 1132 1156
718 734 749 765
839 856 872 889
980 1000 1019 1039 1059
1061 1085 1108 1132 1156
718 734 749 765
839 856 872 889
980 1000 1019 1039 1059
1061 1085 1108 1132 1156
wire in the installer's packet must be connected between R and
W1 for heating mode to operate.
Installation of an accessory supply air temperature (SAT)
sensor in the supply duct is recommended for Linkage applica-
tions. A supply duct SAT measurement is valid for heating
mode display, while the factory-standard internal SAT is not
valid for heating due to its location upstream of the heating sec-
tion. When installing the supply duct SAT, the heating mode
display is enabled by setting Configuration
to ENBL.
Space Humidity Control — Humidistat —
the Humidistat accessory to terminals Humidistat 1 and 2 locat-
ed on the field connection terminal strip in the bottom of the
control box. The Space Humidity Switch setting is located at
→
Configuration
with Humidi-MiZer™ system is 1 (normally open).
Space Humidity Control — Thermidistat™ —
Wire the Thermidistat accessory Dehum output to terminal
Humidistat1 located on the field connection terminal strip in
the bottom of the control box. The Space Humidity Switch set-
ting is located at Configuration
default for units with Humidi-MiZer system is 1 (normally
open).
Space Humidity Control — Relative Humidity
Wire the humidity sensor to terminals 3 (–) and
Sensor —
4 (+) located on the field connection terminal strip in the
bottom of the control box. The RH Sensor on OAQ Input set-
ting is located at Configuration
must be configured to YES to use the relative humidity sensor.
CCN Communication —
→
CCN CCN.A to desired element number. (Default is 1.) Con-
figure Configuration
(Default is 0.) Configure Configuration
desired code number for baud rate. (Default is 3 = 9600 baud.)
Accessories —
tion, control connection tables, and CCN or Display parameter
tables for required connections and configurations.
Service Test —
verify proper operation of compressors, heating stages,
indoor fan, outdoor fans, power exhaust fans, economizer,
Humidi-MiZer system, and alarm relay. Use of Service Test is
recommended at initial system start-up and during trouble-
shooting.
35
3 3 1 / 4 4 1 / 5
2 2
812 833 854 876 897
1099 1120 1142 1163
1078 1098 1117 1137
1179 1203 1226 1250
812 833 854 876 897
1099 1120 1142 1163
1078 1098 1117 1137
1179 1203 1226 1250
853 869 886 903 920
1099 1120 1142 1163
1078 1098 1117 1137
1179 1203 1226 1250
853 869 886 903 920
1099 1120 1142 1163
1078 1098 1117 1137
1179 1203 1226 1250
780 796 811 827 842
906 923 940 957 973
1078 1098 1117 1137
1179 1203 1226 1250
780 796 811 827 842
906 923 940 957 973
1078 1098 1117 1137
1179 1203 1226 1250
→
→
Unit RH.SW. The factory default for units
→ →
Unit RH.SW. The factory
→ →
Unit RH.S. The setting
Configure Configuration
→ →
CCN CCN.B to desired bus number.
→
CCN
See the Field-Installed Accessories sec-
The Service Test function can be used to
5 1 / 6
2
918 939
1185 1206
1156 1176
1273 1297
918 939
1185 1206
1156 1176
1273 1297
937 954
1185 1206
1156 1176
1273 1297
937 954
1185 1206
1156 1176
1273 1297
858 873
990 1007
1156 1176
1273 1297
858 873
990 1007
1156 1176
1273 1297
→
HEAT SAT.H
Wire
→
→
BAUD to