Wiring Diagram - Mr. Heater MH400FAVT Operating Instructions And Owner's Manual

HOW MUCH HEAT DO I REQUIRE?
For economy, it is important to match input heat 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 usually 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.
BTU'S PER HOUR REQUIRED
Cubic feet Temperature Rise Required (
of space to
o
be heated 20
5,000 14,000
7,000 19,000
10,000 27,000
15,000 40,000
20,000 54,000
30.000 80,000
50,000 133,000
WARNING: When using a thermostat controled heater, its
exit area should be protected from personnel and warnings
posted of sudden startup.
Model #170FAVT

WIRING DIAGRAM

COLOR CODE / LEGEND
B BLACK
L BLUE
G GREEN
O ORANGE
R R E D
W WHITE
T_ TERMINAL CONNECTION
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).
Enerco Group, Inc. | Force-Air Propane Construction Heater
o
F)*
o o o
30 40 50
20,000 27,999 34,000
28,000 38,000 47,000
40,000 54,000 67,000
60,000 80,000 100,000
80,000 107,000 133,000
120,000 160,000 200,000
200,000 266,000 333,000
CHASSIS GROUND
MOTOR
T
THERMOSTAT
LINE CORD
Recommended Minimum Gauge
for Cord Extensions
Wire Gauge Chart A.W.G.
Name
Plate 120V
Amps.
5-6
6-8
8-12
10-12
12-14
400FAVT - WIRING CHART
PART
NO. COLOR
1100 White
1040 Black
1226 Red-(Hi-Temp)
1226 Red-(Hi-Temp)
1070 Orange
1959 Green
1959 Red
1959 White
1959 Black
CONNECTION DIAGRAM
VALVE
HI-LIMIT
SWITCH
W
T2
W
T3
T4
W
CHASSIS
GROUND
6
Operating Instructions and Owner's Manual
Cord Length in Feet
25 50 100
18 16 14
18 16 12
18 14 12
16 14 10
16 12 10
LENGTH FROM
7" Valve Terminal
connection
6" On/Off Switch Terminal
connection
16 1/2" High Limit Switch Valve
16 1/2" High Limit Switch Terminal
connection
11" Flame Control Spark Plug
(Ignition)
7" Flame Control Ground
(Harness)
7" Flame Control Terminal
(Harness) connection
6" Flame Control Terminal
(Harness) connection
6" Flame Control Terminal
(Harness) connection
ELECTRODE
O**
IGNTION
VALVE
LINE
W NEUTRAL
GROUND
04/05 Rev. A 72426
150
12
10
10
8
8
TO