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Mr. Heater | Forced-Air Propane Construction Heater Operating Instructions and Owner’s Manual
Model-MH170FAVT
WIRING DIAGRAM
TERMINAL BOARD
Y TERMINAL
MALE CONN
FEMALE CONN
YY
Y
B BLACK
L BLUE
G GREEN
O ORANGE
R RED
W WHITE
COLOR CODE
LEGEND
If any original wiring as supplied by the heater must be
replaced, it must be replaced with type AWG 105° C
wire or its equivalent except as indicated
(*type SF2-200, **SGI 250° C).
MH170FAVT - WIRING CHART
PART
NO. COLOR LENGTH FROM TO
1100 White 7" Valve Terminal Block
1040 Black 6" On/Off Switch Terminal Block
1226 Red-(Hi-Temp) 16 1/2" High Limit Switch Valve
1226 Red-(Hi-Temp) 16 1/2" High Limit Switch Terminal Block
1070 Orange 11" Flame Control Spark Plug
(Ignition)
1959 Green 7" Flame Control Ground
(Harness)
1959 Red 7" Flame Control Terminal Block
(Harness)
1959 White 6" Flame Control Terminal Block
(Harness)
1959 Black 6" Flame Control Terminal Block
(Harness)
HOW MUCH HEAT DO I REQUIRE?
For economy, it is important to match input to that
required. But heat requirements often vary. For
example, it usually takes a lot more heat to get things
warm than it does to keep them that way. Likewise,
outside air temperature ususally changes during the day
so you may need more heat at night than you do in the
daytime. An approximation of the heat required can be
found by using the chart below.
Recommended Minimum Gauge
for Cord Extensions
Wire Gauge Chart A.W.G.
Name
Plate 120V Cord Length in Feet
Amps. 25 50 100 150
5-6 18 16 14 12
6-8 18 16 12 10
8-12 18 14 12 10
10-12 161410 8
12-14 161210 8
WARNING: When using a thermostat controled heater, its
exit area should be protected from personnel and warnings
posted of sudden startup.
Cubic feet Temperature Rise Required (
o
F)*
of space to
be heated 20
o
30
o
40
o
50
o
5,000 14,000 20,000 27,999 34,000
7,000 19,000 28,000 38,000 47,000
10,000 27,000 40,000 54,000 67,000
15,000 40,000 60,000 80,000 100,000
20,000 54,000 80,000 107,000 133,000
30.000 80,000 120,000 160,000 200,000
50,000 133,000 200,000 266,000 333,000
BTU'S PER HOUR REQUIRED
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