Mr. Heater MHI170QFAVT, Operating Instructions And Owner'S Manual

Page: 6 / 24

Force-Air Propane Construction Heater Operating Instructions and Owner’s Manual
6
If­any­original­wiring­as­supplied­by­the­heater­must­be­replaced,­
it­must­be­replaced­with­type­AWG­105°­C­wire­or­its­equivalent­
except­as­indicated­(*type­SF2-200,­**SGI­250°­C).
170QFAVT ‑ WIRING CHART
COLOR LENGTH FROM TO
White­ ­ 7”­ Valve­­ Terminal­Block
Black­ ­ 6”­ On/Off­Switch­ Terminal­Block
Red-(Hi-Temp)­ 16­1/2”­ High­Limit­Switch­ Valve­
Red-(Hi-Temp)­ 16­1/2”­ High­Limit­Switch­ Terminal­Block
Orange­ ­ 11”­ Flame­Control­­ Spark­Plug
­ ­ ­ (Ignition)­ ­
Green­ ­ 7”­ Flame­Control­ Ground
­ ­ ­ (Harness)­
Red­ ­ 7”­ Flame­Control­­ Terminal­Block
­ ­ ­ (Harness)
White­ ­ 6”­ Flame­Control­ Terminal­Block
­ ­ ­ (Harness)
Black­ ­ 6”­ Flame­Control­ Terminal­Block
­ ­ ­ (Harness)­
HOW MUCH HEAT DO I REQUIRE?
For­economy,­it­is­important­to­match­input­to­that­required.­But­
heat­requirements­often­vary.­For­example,­it­usually­takes­a­lot­
more­heat­to­get­things­warm­than­it­does­to­keep­them­that­way.­
Likewise,­outside­air­temperature­usually­changes­during­the­day­
so­you­may­need­more­heat­at­night­than­you­do­in­the­daytime.­
An­approximation­of­the­heat­required­can­be­found­by­using­the­
chart­below.
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 16­ 14­ 10­ ­­­8­
­ 12-14­ 16­ 12­ 10­ ­­­8
WARNING:
When­using­a­thermostat­controlled­heater,­
its­ exit­ area­ should­ be­ protected­ from­ personnel­ and­
warnings­posted­of­sudden­startup.
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 80,000­­­­­­­100,000
­ ­20,000­ 54,000­ 80,000­­­­­­­107,000­­­­­­­­­133,000
­ ­30.000­ 80,000­­­­­­­120,000­­­­­­­­160,000­­­­­­­­­200,000
­ ­50,000­­­­­­­­­­­­­­­­133,000­­­­­­­200,000­­­­­­­­266,000­­­­­­­­­­333,000
BTU’S PER HOUR REQUIRED
HIGH-LIMIT SWITCH X2
LINE
VALVE
NEUT
GRD
CHASSIS
GROUND
CHASSIS
GROUND CHASSIS
GROUND
CHASSIS
GROUND
CHASSIS
GROUND
LINE­CORD
THERMOSTAT
MOTO R
GAS
VALVE
FLAME­CONTROL
SPARK­PLUG
G
W
G
G
B
B
B
B
R
W
W
R
Y
B
Y
G
G
WIRING DIAGRAM
SIZE AND CAPACITY OF PROPANE
CYLINDERS
The­charts­below­show­the­approximate­size­of­the­cylinder­
required­for­these­heaters.­­To­use­the­chart:
1.­­ Select­the­lowest­air­temperature­expected­(at­the­bottom­of­
the­chart).
2.­ Move­straight­up­to­time­of­operation­desired­
(left­side­of­the­chart).
3.­ Read­the­cylinder­size­required.
All­heaters­should­have:­ full­cylinders
­ good­air­circulation
­ no­frost­on­cylinders
Fuel­Cyclinder­Capacity:­100#
COLOR­CODE
B-BLACK
L-BLUE
G-GREEN O-ORANGE
R-RED
W-WHITE
1 cylinder
2 cylinders
3 cylinders
Y - YELLOW