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Table 69B — Staged Gas Heat — 48A2,A3,A4,A5 Units
Table 70 — Staged Gas Heat Control Steps (Configuration
HEAT
SG.CF
HT.ST = 1)
Table 71 — Staged Gas Heat Control Steps (Configuration
HEAT
SG.CT
HT.ST = 2)
Table 72 — Staged Gas Heat Control Steps (Configuration
HEAT
SG.CT
HT.ST = 3)
UNIT SIZE HEAT CAPACITY
UNIT MODEL NO.
POSITION NO. 5
Configuration
HEAT
SG.CF
HT.ST
ENTRY VALUE
020-030
Low S 1 = 5 STAGE
High T 2 = 7 STAGE
035-050
Low S 1 = 5 STAGE
High T 1 = 5 STAGE
060
Low S 4 = 11 STAGE
High T 3 = 9 STAGE
STAGE
RELAY OUTPUT
CAPACITY
%
Heat 1 Heat 2 Heat 3 Heat 4 Heat 5 Heat 6
MBB-RLY8 MBB-RLY7 SCB-RLY1 SCB-RLY2 SCB-RLY3 SCB-RLY4
IGC1 MGV1 IGC2 MGV2 IGC3 MGV3
0 OFF OFF OFF OFF OFF OFF 0
1 ON OFF OFF OFF OFF OFF 37
2 ON ON OFF OFF OFF OFF 50
3 ON OFF ON OFF OFF OFF 75
4 ON ON ON OFF OFF OFF 87
5 ON ON ON ON OFF OFF 100
STAGE
RELAY OUTPUT
CAPACITY
%
Heat 1 Heat 2 Heat 3 Heat 4 Heat 5 Heat 6
MBB-RLY8 MBB-RLY7 SCB-RLY1 SCB-RLY2 SCB-RLY3 SCB-RLY4
IGC1 MGV1 IGC2 MGV2 IGC3 MGV3
0 OFF OFF OFF OFF OFF OFF 0
1 ON OFF OFF OFF OFF OFF 25
2 ON ON OFF OFF OFF OFF 33
3 OFF OFF ON OFF OFF OFF 50
4 OFF OFF ON ON OFF OFF 67
5 ON OFF ON OFF OFF OFF 75
6 ON ON ON OFF OFF OFF 83
7 ON ON ON ON OFF OFF 100
STAGE
RELAY OUTPUT
CAPACITY
%
Heat 1 Heat 2 Heat 3 Heat 4 Heat 5 Heat 6
MBB-RLY8 MBB-RLY7 SCB-RLY1 SCB-RLY2 SCB-RLY3 SCB-RLY4
IGC1 MGV1 IGC2 MGV2 IGC3 MGV3
0 OFF OFF OFF OFF OFF OFF 0
1 ON OFF OFF OFF OFF OFF 25
2 ON ON OFF OFF OFF OFF 33
3 ON OFF ON OFF OFF OFF 50
4 ON ON ON OFF OFF OFF 58
5 ON ON ON ON OFF OFF 67
6 ON OFF ON OFF ON OFF 75
7 ON OFF ON ON ON OFF 83
8 ON ON ON ON ON OFF 92
9 ON ON ON ON ON ON 100