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Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual
Part # Color Length From To
1040 Black 6" (152mm) I1 (Ignitor) T.B. Line
1070 Orange 11" (279mm) 1 (Ignitor Spark Plug
1041 White 4 1/2" (114mm) I2(Ignitor) T.B. Return
1044 Yellow 16" (406mm) High Limit T.B. Middle
1044 Yellow 16" (406mm) High Limit T.B. Line
1441 Black 5" ((127mm) Relay T.B. Middle
1442 White 5" (127mm) Relay T.B. Return
1806 Orange 6" (152mm) Relay Thermocouple Junction Block
1806 Orange 6" (152mm) Relay Thermocouple Junction Block
MH55FAV, MH85FAV, MH125FAV
WIRING CHART
WIRING DIAGRAMS
CONNECTION DIAGRAM
MOTOR
IGNITOR
B
SCHEMATIC DIAGRAM
HIGH-LIMIT SWITCH
THERMOCOUPLE
SPARK PLUG
MOTOR
IGNITOR
RELAY
GAS
HIGH-LIMIT SWITCH
SPARK PLUG
THERMOCOUPLE
R* or Y*
R* or Y*
I1
I2
B** or O**
B
B
W
B
RELAY
B
W
B
W
G
LINE CORD
115V
60HZ
VALVE
I1
I2
COLOR CODE
LEGEND
BLACK
BLUE
WHITE
GREEN
L
R
Y
O
RED
YEL
ORG
FEMALE CONN.
RING CONN.
TERMINAL BOARD
IF ANY ORIGINAL WIRING AS SUPPLIED WITH THE HEATER MUST BE REPLACED, IT MUS BE REPLACED WITH
TYPE AWG 105° C WIRE OR ITS EQUIVALENTEXCEPT AS INDICATED (*TYPE SF 2-200, **SGI-250°C)
NOTE: