Page 3
9.
Install power wiring and connect to power block or circuit
breakers. In 12, 15 or 20kW models two power circuits
may be used to reduce wiring and breaker costs as in
Figure 7a. If a single circuit supply is desired, install the
optional single circuit accessory kit, as shown in Figure 7b,
that can be obtained from your Carrier distributor.
10. Check unit CFM of Table 1 and ensure airflow setting is
above minimum airflow rating for the electric heat model
from Table 2. Low speed blower not allowed with
electric heat.
11. Check staging jumpers for the application. Typically only
5 kW (factory setting on all models except 10kW on 20kW
models) is needed for first stage electric (W1) to minimize
electric demand. This staging can be adjusted by moving
the staging jumpers as shown in Figure 8.
12. Mark the appropriate box of the electric heat model
installed on the additional serial plate on the exterior of the
unit.
13. Turn on the power to the unit and the auxiliary electric
heat.
Auxiliary Electric Heat Start-up
14. Run thermostat to emergency heat mode (or jumper t-stat
input R to W) and setpoint to high setting. ‘Touch-jumper'
the test pins of the CXM or DXM into test mode to reduce
time delays. Unit will require 15-20 seconds before
engaging emergency heat mode stage 1 (W1) and then
another 15-20 seconds to engage stage 2 (W2) when in
‘Test mode’. Verify proper electric heat operation.
NO
Com
ER1
NO
Com
ER2
NO
Com
ER3
NO
Com
ER4
1
2
3
Tan
Ora
Factory Staging
(see Table 2)
Low Voltage Connector
(from Unit Control Board)
Genesis Electric
Heat Relay Board
P1
P2
24V
W1
W2
4
Staging Example on a 15kW unit W1 (first stage) has
5kW (‘ER1’ 5kW & ‘ER4’ 0kW) and W2 (second stage)
will have 10kW (‘ER2 & 3’ 5kW each)
1
2
3
4
Tan
Ora
P2
Side View as seen in Control Box
P1
Figure 8. Staging Jumpers
Table 1. GT-G PSC Blower Performance Table
GT-G Electric
Heat Relay Board
GT-G
Series
Fan
Airflow (cfm) at External Static Pressure (in. wg)
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.60
0.70
0.80
0.90
1.00
5 0 Y C G
Future Product - Data Not Available
5 0 Y C G
Future Product - Data Not Available
H
781
771
764
757
748
740
718
697
665
638
610
-
-
-
-
5 0 Y C G
M
739
719
710
702
688
675
658
641
619
598
-
-
-
-
-
L*
626
613
605
597
589
581
566
551
531
512
-
-
-
-
-
H
781
771
764
757
748
740
718
697
665
638
610
-
-
-
-
5 0 Y C G
M
739
719
710
702
688
675
658
641
619
598
-
-
-
-
-
L*
626
613
605
597
589
581
566
551
531
512
-
-
-
-
-
H
1066
1038
1010
983
954
926
900
874
838
803
707
-
-
-
-
5 0 Y C G
M
902
886
870
854
831
809
782
756
726
702
-
-
-
-
-
L*
797
779
761
738
726
709
683
657
634
606
-
-
-
-
-
H
1173
1152
1125
1104
1081
1058
1033
1007
984
955
841
-
-
-
-
5 0 Y C G
M
1085
1061
1037
1013
975
938
916
894
864
830
-
-
-
-
-
L*
939
924
909
894
871
853
827
802
779
752
-
-
-
-
H
1358
1330
1291
1258
1225
1198
1162
1132
1094
1057
965
858
-
-
-
5 0 Y C G
M
1216
1193
1166
1143
1112
1082
1050
1023
982
941
-
-
-
-
-
L*
1069
1059
1049
1039
1021
999
975
952
925
899
-
-
-
-
-
H
-
-
1780
1700
1622
1612
1580
1544
1491
1434
1343
1211
-
-
-
5 0 Y C G
M
1546
1524
1502
1480
1450
1426
1396
1371
1333
1294
-
-
-
-
-
L*
1217
1205
1193
1181
1168
1156
1128
1100
1063
1031
-
-
-
-
-
H
-
-
1893
1851
1807
1768
1718
1664
1630
1596
1454
1322
1195
-
-
5 0 Y C G
M
1744
1699
1664
1624
1578
1532
1498
1468
1419
1376
-
-
-
-
-
L*
1362
1336
1314
1298
1275
1252
1219
1187
1152
1112
-
-
-
-
-
H
-
-
-
-
2222
2197
2167
2137
2106
2076
2019
1941
1839
1705
1641
5 0 Y C G
M
2135
2113
2090
2068
2045
2022
2004
1981
1950
1924
1871
1869
-
-
-
L*
1909
1890
1876
1862
1841
1825
1803
1787
1762
1733
-
-
-
-
-
H
-
-
-
-
2501
2477
2439
2400
2370
2345
2275
2205
2061
1921
1779
5 0 Y C G
M
2465
2432
2403
2380
2353
2331
2304
2278
2250
2223
2158
2076
-
-
-
L*
2132
2117
2107
2092
2069
2052
2031
2001
1976
1940
-
-
-
-
-
Includes allowance for wet coil and clean factory-installed filter
Factory settings are indicated in bold print
(-) operation not recommended
* Electric Heat operation not allowed with blower motor set at low speed
Model
Snd
