Lennox CHA16 - PARTS ARRANGEMENT ELECTRIC HEAT SECTION CHA16 SERIES UNITS 7.5 THRU 12.5 TONS 10, 15, 20, 30, 40 AND 50 KW

Page 37
Contactor K15
K16
K17
K18
DL2
DL4
DL5
K9
K19
T2
F3 F3
L1L2L3
GND
1st Stage (all units)
Contactor K16
2nd Stage
(208/230v 30kW and
Contactor K17
3rd Stage
(40kW and 50 kW
208/230V units only)
Contactor K18
4th Stage
(50 kW 208/230v units)
K15
1st Stage Fuse F3
(208/230V units if
equipped with
multiple stages)
(460 & 575V units
if equipped with
multiple stages)
3rd Stage Fuse F3
(208/230V units
if equipped with
multiple stages)
4th Stage Fuse F3
Electric Heat
Electric Heat
Transformer T2
2nd Stage Heat Demand
1st Stage Heat Demand
Pilot Relay K9
Pilot Relay K19
2nd Stage
Time Delay DL2
(all units equipped
with multiple stage
heaters)
3rd Stage
Time Delay DL4
4th Stage
Time Delay DL5
(50 kW 208/230v
Secondary Limit S20
(2 each element)
208/230V,15kW-2
208/230V,30kW-4
208/230V,40kW-6
460V & 575V,15kW-2
460V & 575V,30kW-4
460 & 575V,40kW-6
460V & 575V,50kW-8
Primary Limit S15
(208/230V only)
Redundant Limit S63
(460 & 575V only)
Primary Limit S15
(460 & 575V only)
PatchPlate
(in lieu of limit
208/230V only)
F3 F3
FIGURE 31
PARTS ARRANGEMENT
ELECTRIC HEAT SECTION
CHA16 SERIES UNITS 7.5 THRU 12.5 TONS
10, 15, 20, 30, 40 AND 50 KW
208/230V,50kW-8
208/230V,10 kW-2
460V & 575V,10kW-2
all 40 kW & 50 kW units)
2nd Stage Fuse F3
2nd Stage Fuse F3
(208/230V, 50kW only)
(all units)
Terminal Strip TB3
(40kW and 50 kW
208/230V units only)
units only)