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Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual
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BLUE
BLACK
BLACK
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BLACK
EQUIPMENT
GROUND
WHITE WHITE
WHITE (COM)
WHITE
YELLOW
VLV
RTN
VLV
OUT
YELLOW
GREEN/YELLOW
1(S47)
T1 24V
120V
L1
A3
LINE VOLTA GE FIELD INSTALLED
MAXIMUM LOAD NOT TO EXCEED
20VA AT 24V, CLASS 2.
DISCONNECT ALL POWER
BEFORE SERVICING.
FOR PROPER GROUNDING,
REFER TO LOCAL CODES.
DESCRIPTION
COMPONENT
CONTROL, BURNER, IGNITION
MOTOR, FA N
MOTOR, COMBUSTION AIR BLOWER
VA LV E, GAS
LIMIT, PRIMARY, GAS
SWITCH, COMB, AIR BLWR PRONE
SWITCH-FLAME ROLLOUT 1
SWITCH-FLAME ROLLOUT 2
TRANSFORMER CONTROL
KEY
A3
B3
B6
6VI
510
518
(1) S47
(2) S47
T1
SET THERMOSTA T HEAT ANTICIPA T ION
ROBERTSHAW VA LVE............ .4
WA RNING-
ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY
OR DEATH, UNIT MUST BE GROUNDED IN ACCORDANCE
WITH NATIONAL AND LOCAL CODES.
CLASS II 24 VAC FIELD INSTALLED
DENOTES OPTIONAL COMPONENTS
B6
B3
L1
CWB
BLWR
HTG
ACC
ACC
ACC
ACB
LOW
ACB
COOL
ACB
HEAT
N
2(S47)
BROWN
RED
ORANGE
COM
S18
S10
GV1
GND
3
4
1
5
F5
A3
R
G
W
C
P20
2
6
HIL
OUT
HEAT 1 (W1)
24V POWER (R)
ONLY WITH
MANUAL FA N
BLOWER (G)
HIL
RTN
PSW
RTN
24VAC
HOT
PSW
OUT
FLAME
SENSOR
SPARK
ELECTRODE
GND PROGRAMMABLE
THERMO.
24V COMMON (C)
WIRING SCHEMATIC FOR UNITS WITH
6-PIN CONNECTOR GCI-3A (23L53) CONTROL BOARD
NOTE: IF ANY OF THE ORIGINAL WIRE AS
SUPPLIED WITH THE APPLIANCE MUST BE
REPLACED, IT MUST BE REPLACED WITH
WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105
°
C.
OPTIONAL THERMOSTAT INSTALLATION
IT IS RECOMMENDED TO USE 18AWG WIRE
WHEN INSTALLING THE THERMOSTAT.
CONNECT THERMOSTAT WIRING TO
TERMINALS ‘R’ AND ‘W’ AS ILLUSTRATED ON
THE SCHEMATIC DIAGRAM.
LADDER DIAGRAM
WIRE DIAGRAM
GAS FIRED UNIT HEATER DSI-IGNITION
MHU45LP MHU45NG
HSU45LP HSU45NG
MHU75LP MHU75NG
HSU75LP HSU75NG
60006 REV.