Wiring Diagram - Mr. Heater MHU 80 Operating Instructions And Owner's Manual

MAXIMUM LOAD NOT TO EXCEED
1
20VA AT 24V,CLASS 2
(2) S47 USED IN
2
,
75 80 AND 125 ONLY
NOTE-
IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IF ANY WIRE IN THIS APPLIANCE IS REPLACED,
IT MUST BE REPLACED WITH WIRE OF LIKE IT MUST BE REPLACED WITH WIRE OF LIKE
SIZE, RATING AND INSULATION THICKNESS. SIZE, RATING AND INSULATION THICKNESS.
WARNING-
ELECTRIC SHOCK HAZARD CAN CAUSE INJURY ELECTRIC SHOCK HAZARD CAN CAUSE INJURY
OR DEATH. UNIT MUST BE GROUNDED IN OR DEATH. UNIT MUST BE GROUNDED IN
ACCORDANCE WITH NATIONAL AND LOCAL ACCORDANCE WITH NATIONAL AND LOCAL
CODES. CODES.
DISCONNECT ALL POWER DISCONNECT ALL POWER
BEFORE SERVICING! BEFORE SERVICING!
DESCRIPTION
KEY COMPONENT
A3
CONTROL BOARD (PCB)
B3 MOTOR- CIRCULATION
B6
MOTOR-COMBUSTION AIR INDUCER
C4
CAPACITOR-BLOWER MOTOR 1
C5 CAPACITOR-IN DUCED DRAFT MOTOR
DL36 RELAY-DELAY(N/A TO THESE MODELS)
GV1 VALVE- GAS
S10 SWITCH - PRIMARY GAS
S18 SWITCH-COMB AIR BLWR
S47 SWITCH-FLAME ROLLOUT
T1 TRANSFORMER- CONTROL
BLACK
L
WHITE
N
G
CHASSIS
GROUND
L1
CONNECT CHASSIS CONNECT CHASSIS
GROUND TO GROUND TO
EARTH GROUND EARTH GROUND
CAPACITOR USED IN 125 ONLY

WIRING DIAGRAM

FLAME FLAME
SENSOR SENSOR
S18
COM
(1)S47
(2)S47
2
T1
BROWN
SPARK SPARK
ELECTRODE ELECTRODE
CMB A3
BLWR ACC ACC
C5
B6
C4
CAPACITOR USED IN 75, 80 AND 125 ONLY
B3
L1
(HOT)
N
(NEUTRAL)
EQUIPMENT EQUIPMENT
GROUND GROUND
Compact Unit / Utility Heater
1
24VAC 24VAC
HOT HOT
FLAME
1 TO 6
P1 ON BOARD
BROWN
PRES. SW. PRES. SW.
5
RETURN RETURN
RED
PRES. SW. PRES. SW.
2
OUT OUT
R
ORANGE HIGH LIMIT HIGH LIMIT
1
SW. RETURN SW. RETURN
G
S10
BLUE
HIGH LIMIT HIGH LIMIT
6
SWITCH OUT SWITCH OUT
W
C
BLUE GAS VLV GAS VLV
3
RETURN RETURN
GV1
YELLOW
GAS VLV GAS VLV
4
OUT OUT
GND
A3
LINE VOLTAGE FIELD INSTALLED
THERMOSTAT WIRING
LADDER DIAGRAM
Fan
Ventilateur
Combustion Blower Combustion Blower
White
Soufflerie De Ventilateur Soufflerie De Ventilateur
Blanc
White
Blanc
Black
Noir
Transformer/ Transformer/
Transformateur Transformateur
White
Blanc
Orange
Flame Rollout Switch Flame Rollout Switch
Flamber le commutateur Flamber le commutateur
de deploiement de deploiement
Blue
Bleu
Flame Sensor/ Flame Sensor/
Detecteur de Detecteur de
Flame Rollout Switch Flame Rollout Switch
renommee renommee
Flamber le commutateur Flamber le commutateur
de deploiement de deploiement
Red/ Red/
Rouge Rouge
Air Switch/ Air Switch/
lnterrupteur a air lnterrupteur a air
lgniter / Contact
13
Operating Instructions and Owner's Manual
R
24 Vac POWER
G
OPTIONAL FAN CONTROL
W
HEAT 1
C
COMMON
Red
White
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.
NOTE: THERMOSTAT TERMINAL
CONNECTIONS ARE MOUNTED
ON THE BACK PANEL OF THE
HEATER.
EXTERNAL THERMOSTAT
TERMINAL STRIP WARNING: DO
NOT CONNECT LINE POWER TO
THE THERMOSTAT TERMINAL
STRIP.
Black
Noir
ACB COOL ACB COOL
ACB HEAT ACB HEAT
ACB LOW ACB LOW
ACC ACC
ACC ACC
Black
HTG ACC HTG ACC
Noir
CWB BLWR CWB BLWR
Black
L1
Noir
120V
Blue
24 VAC (HOT) 24 VAC (HOT) 24 V POWER (R)
24V Bleu
FLAME SENSOR FLAME SENSOR
PSW RTN PSW RTN MAN BLOWER (G) MAN BLOWER (G)
HEAT 1 (W1) HEAT 1 (W1)
PSW OUT PSW OUT
HIL RTN HIL RTN
HIL OUT HIL OUT
SPK ELE SPK ELE
White White
VLV RTN VLV RTN
Blanc Blanc
VLV OUT VLV OUT GND PRO THER GND PRO THER
Blue
GND GND 24 V (COMM) (C) 24 V (COMM) (C)
Yellow Yellow
Bleu
Jaune Jaune
EQUIPMENT EQUIPMENT
Gas Valve / Gas Valve /
GROUND GROUND
Valve a gaz Valve a gaz
THERMOSTAT