Mr. Heater MHI170QFAVT Operating Instructions And Owner's Manual page 6

SIZE AND CAPACITY OF PROPANE
CYLINDERS
The­charts­below­show­the­approximate­size­of­the­cylinder­
required­for­these­heaters.­­To­use­the­chart:
1.­­ Select­the­lowest­air­temperature­expected­(at­the­bottom­of­
the­chart).
2.­ Move­straight­up­to­time­of­operation­desired­
(left­side­of­the­chart).
3.­ Read­the­cylinder­size­required.
All­heaters­should­have:­
­
­
2 cylinders
1 cylinder
HOW MUCH HEAT DO I REQUIRE?
For­economy,­it­is­important­to­match­input­to­that­required.­But­
heat­requirements­often­vary.­For­example,­it­usually­takes­a­lot­
more­heat­to­get­things­warm­than­it­does­to­keep­them­that­way.­
Likewise,­outside­air­temperature­usually­changes­during­the­day­
so­you­may­need­more­heat­at­night­than­you­do­in­the­daytime.­
An­approximation­of­the­heat­required­can­be­found­by­using­the­
chart­below.
BTU'S PER HOUR REQUIRED
Cubic feet Temperature Rise Required (
of space to
be heated 20 o
­ ­­5,000­ 14,000­
­ ­­7,000­ 19,000­
­ ­10,000­ 27,000­
­ ­15,000­ 40,000­
­ ­20,000­ 54,000­
­ ­30.000­ 80,000­­­­­­­120,000­­­­­­­­160,000­­­­­­­­­200,000
­ ­50,000­­­­­­­­­­­­­­­­133,000­­­­­­­200,000­­­­­­­­266,000­­­­­­­­­­333,000
Operating Instructions and Owner's Manual
full­cylinders
good­air­circulation
no­frost­on­cylinders
Fuel­Cyclinder­Capacity:­100#
3 cylinders
F)*
o
30 o 40 o 50 o
20,000­ 27,999­ 34,000
28,000­ 38,000­ 47,000
40,000­ 54,000­ 67,000
60,000­ 80,000­­­­­­­100,000
80,000­­­­­­­107,000­­­­­­­­­133,000
WARNING: When­using­a­thermostat­controlled­heater,­
its­ exit­ area­ should­ be­ protected­ from­ personnel­ and­
warnings­posted­of­sudden­startup.
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
WIRING DIAGRAM
B
GAS
VALVE
W
CHASSIS
GROUND
B
MOTOR
B
CHASSIS
GROUND
R
THERMOSTAT
B
LINE­CORD
CHASSIS
GROUND
COLOR­CODE
B-BLACK
L-BLUE
G-GREEN
If­any­original­wiring­as­supplied­by­the­heater­must­be­replaced,­
it­must­be­replaced­with­type­AWG­105°­C­wire­or­its­equivalent­
except­as­indicated­(*type­SF2-200,­**SGI­250°­C).
170QFAVT ‑ WIRING CHART
COLOR LENGTH
White­ ­ 7"­
Black­ ­ 6"­
Red-(Hi-Temp)­ 16­1/2"­
Red-(Hi-Temp)­ 16­1/2"­
Orange­ ­ 1 1"­
­ ­ ­
Green­ ­ 7"­
­ ­ ­
Red­ ­ 7"­
­ ­ ­
White­ ­ 6"­
­ ­ ­
Black­ ­ 6"­
­ ­ ­
6
Force-Air Propane Construction Heater
Cord Length in Feet
25 50 100
18­ 16­ 14­
18­ 16­ 12­
18­ 14­ 12­
16­ 14­ 10­
16­ 12­ 10­
SPARK­PLUG
B
LINE
HIGH-LIMIT
Y
VALVE
Y
NEUT
R
W
GRD
FLAME­CONTROL
W
G
CHASSIS
GROUND
O-ORANGE
R-RED
W-WHITE
Y-YELLOW
FROM TO
Valve­­ Terminal­Block
On/Off­Switch­ Terminal­Block
High­Limit­Switch­ Valve­
High­Limit­Switch­ Terminal­Block
Flame­Control­­ Spark­Plug
(Ignition)­ ­
Flame­Control­ Ground
(Harness)­
Flame­Control­­ Terminal­Block
(Harness)
Flame­Control­ Terminal­Block
(Harness)
Flame­Control­ Terminal­Block
(Harness)­
150
­12
­10
­10
­­­8­
­­­8
G
CHASSIS
GROUND