Enerco HSU 75 User Manual

enerco | Compact Unit Heater

operating Instructions and owner’s Manual

BLUE

BLA
CK

BLACK

EQUIPMENT

GROUND

WHITE

OM)

WHITE

YELLOW

VLV

RTN
VLV

OUT

YELLOW

GREEN/YELL

1(S47)

T1 24V

120V

LINE VOLTAGE 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, FAN

MOTOR, COMBUSTION AIR BLOWER

VALVE, GAS

LIMIT, PRIMARY, GAS

SWITCH, COMB, AIR BLWR PRONE

SWITCH-FLAME ROLLOUT 1

SWITCH-FLAME ROLLOUT 2

TRANSFORMER CONTROL

KEY

6VI

510

518

(1) S47

(2) S47

SET THERMOSTAT HEAT ANTICIPATION

ROBERTSHAW VALVE............ .4

WARNING-

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

CWB

BLWR

HTG

ACC

ACB

LOW

ACB

COOL

ACB

HEAT

2(S47)

BROWN

RED

ORANGE

COM

S18

S10

GV1

GND

P20

6 HIL

OUT

HEAT 1 (W1)

24V POWER (R)

ONLY WITH

MANUAL FAN

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

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.