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Force-Air Propane Construction Heater

Operating Instructions and Owner’s Manual

5

OPERATING INSTRUCTIONS

PREPARING FOR OPERATION

1.  Check the heater for possible shipping damage. If any is 

found, 

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 notify the factory.

2.  Follow all of the “Precautions”. 
3.  Connect the POL fitting of hose and regulator assembly 

to the propane cylinder by rotating the POL nut 
counterclockwise into the propane cylinder’s valve outlet and 
securely tighten with a wrench.

4.  Connect the hose to the heater by rotating the hose fitting 

clockwise.

5.  Securely tighten all gas connections.
6.  Open the cylinder’s gas valve and check all gas connections 

with a soap and water solution. DO NOT USE A FLAME.

7.  Connect power cord to well-grounded 115V, 60 Hz, 1Ø 

source of power.

8.  When using an extension cord, make certain that it is a 

3-wire (grounded) cord of proper wire size.

170QFAVT 

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START 

1.  Slowly open the main valve at propane cylinder to 

prevent excess flow check valve from closing.

2.  Set thermostat to full on.  Heater will ignite 

automatically.

3.  Adjust ball valve on control panel to desired burn rate.
4.  Set thermostat to desired temperature. Heater will turn 

off and  on automatically as the temperature varies in 
the heater area.

STOP

1.  Securely close valve on the propane cylinder.
2.  Continue to operate heater until all fuel in the hose has 

burned.

3.  Unplug the heater from electrical supply.

CAUTION: 

Failure to unplug the unit may result in 

unexpected operation.

RESTART AFTER SAFETY SHUTDOWN

1.  Securely close valve at propane cylinder. Unplug heater.
2.  Wait 5 minutes.
3.  Restart following “Start” procedure.

MAINTENANCE AND STORAGE

1.  The heater should be inspected before each use, and at least 

annually by a qualified person.

2.  Before each use, check the soft “O” ring seat at the bullnose 

of the POL fitting. If the “O” ring is cut, scuffed, or otherwise 
damaged, replace it with part number F273786.

3.  Turn off the gas at the LP-gas supply cylinder(s) when the 

heater is not in use.

4.  When the heater is to be stored indoors, the connection 

between the LP-gas supply cylinder(s) and the heater must 
be disconnected and the cylinder(s) removed from the heater 
and stored out of doors and in accordance with Chapter 
5 of the standard for Storage and Handling of Liquefied 
Petroleum Gases ANSI/NFPA 58 and CSA B149.1, Natural 
Gas and Propane Installation Code.

SERVICING

A hazardous condition may result if a heater is used that has 
been modified or is not functioning properly.  
When the heater is working properly:

 

• 

The flame is contained within the heater.

 

• 

The flame is essentially blue with perhaps some  

 yellow 

tipping.

 

• 

There is no strong disagreeable odor, eye burning or  

 

other physical discomfort.

 

• 

There is no smoke or soot internal or external to the  

 heater.

 

• 

There are no unplanned or unexplained shut downs  

 

of the heater.

The parts lists and wiring diagram show the heater as it was 
constructed. Do not use a heater which is different from 
that shown. In this regard, use only the hose, regulator and 
cylinder connection fitting (called a POL fitting) supplied 
with the heater. 

IMPORTANT

 Match the color stripe on the 

hangtag attached to the hose assembly with the color on the 
label located near the propane inlet fitting on the heater. Do 
not use alternates. For this heater, the regulator must be set 
as shown in “specifications”. If there is any uncertainty about 
the regulator setting, have it checked.

A heater which is 

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working right must be repaired, but 

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 by a trained, experienced service person.

In-warranty products will be repaired with no charge for 
either parts or labor. Please include a brief statement 
indicating date, place of purchase, the nature of the problem 
and proof of purchase.

Out-of-warrranty products will be repaired with a charge for 
parts and labor.

Summary of Contents for MHQ170FAVT

Page 1: ...this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life MH170QFAVT OPERATING INSTRUCTIONS AND OWNER S MANUAL READ INSTRUCTIONS CAREFU...

Page 2: ...Y CARBON MONOXIDE WARNING YOUR SAFETY IS IMPORTANT TO YOU AND TO OTH ERS SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU OPERATE THIS HEATER GENERAL HAZARD WARNING FAILURE TO COMPLY WITH THE PRECAUTIONS...

Page 3: ...dified from its original condition 3 Use only propane gas 4 Use only VAPOR WITHDRAWAL propane supply If there is any question about vapor withdrawal ask your propane dealer 5 Mount the propane cylinde...

Page 4: ...rters Do not use in unventilated areas The flow of combustion and ventilation air must not be obstructed Proper ventilation air must be provided to support the combustion air requirements of the heate...

Page 5: ...e of the POL fitting If the O ring is cut scuffed or otherwise damaged replace it with part number F273786 3 Turn off the gas at the LP gas supply cylinder s when the heater is not in use 4 When the h...

Page 6: ...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 a...

Page 7: ...hield 1 11 27475 Barrel assembly 1 12 27476 Burner gas tubing 1 13 27808 Potted flame control 1 14 28771 Terminal block 1 15 26070 Loop clamp 5 16 1 16 22254 Thermostat assembly 17 25026 Elevation kno...

Page 8: ...communication LIMITED WARRANTY Mr Heater Inc warrants its heaters and accessories to be free from defects in material and workmanship for a period of 1 year from date of purchase Mr Heater Inc will re...

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