Table Of Contents; Specifications; Precautions - Mr. Heater MHVFRD20NGT Operating Instructions And Owner's Manual

MODEL
BTU (Available)
Type of Gas
Ignition
Manifold Pressure
Inlet Gas Pressure (Maximum)
Inlet Gas Pressure (Minimum)
Electrical Rating /Blower*
Thermostatic Control
Top
Sides
Floor (min to top of carpet) 3" (76.2cm)
Fabric / flammable objects
*Blower not included on the following units: MHVFRD20NGT, MHVFRD30NGT, MHVFBF20NGT, MHVFBF30NGT
**Operating heater above elevations of 4,500 feet could cause pilot/ODS to shutdown heater.**
CONTENTS
WARNINGS ........................................................................2
SPECIFICATIONS .................................................................3
PRECAUTIONS ....................................................................3
IGNITION SYSTEM BATTERY INSTALLATION .......................4
DETERMINING THE TYPE
OF HEATER LOCATION SPACE .........................................5
INSTALLATION ...................................................................6
FASTENING HEATER TO WALL ............................................7
FLOOR MOUNTING AWAY FROM WALL .............................8
CONNECTING TO GAS SUPPLY ...........................................8
OPERATING YOUR HEATER ............................................... 10
CLEANING AND MAINTENANCE .......................................11
TROUBLESHOOTING ........................................................ 14
PARTS LIST AND DIAGRAM .............................................. 17
WARRANTY .................................................................... 20

PRECAUTIONS:

1. An unvented room heater having an input rating
of more than 10,000 BTU (2931 W) (i.e. the
MHVFRD20NGBT, MHVFRD20NGT, MHVFRD30NGBT,
MHVFRD30NGT, MHVFBF20NGBT, MHVFBF20NGBT, and
MHVFBF30NGBT, MHVFBF30NGBT) shall not be installed
in a bedroom or bathroom, or any place where a strong
wind would shut down the appliance.
2. This heater needs outside ventilation air to run properly.
The Oxygen Depletion Sensor (ODS) safety shutoff
system shuts down the heater if not enough fresh air is
available. See Fresh Air for Combustion and Ventilation,
page 5.
3. Keep all air openings in heater clear, free of debris or
any blockage. This will ensure that enough air for proper
combustion enters the heater.
4. If heater shuts off, do not relight until you provide fresh,
outside air. If heater keeps shutting off, it requires
servicing.
5. Turn off and let cool before servicing. Only a qualified
service person should service and repair heater.
Unvented Natural Gas Vent Free Room Heaters
MHVFRD20NGBT,
MHVFRD30NGBT,
MHVFRD20NGT
MHVFRD30NGT
18,000 30,000
Natural Gas Only Natural Gas Only
Battery ignitor (1-AA) Battery ignitor (1-AA)
4.5 Inches of Water 4.5 Inches of Water
14 Inches of Water 14 Inches of Water
7 Inches of Water 7 Inches of Water
120V, 60Hz , 1 120V, 60Hz , 1
Yes Yes
Clearances: inches (mm)
36" (91.4cm) 36" (91.4cm)
10" (25.4cm) 10" (25.4cm)
3" (76.2cm)
36" (91.4cm) 36" (91.4cm)
MHVFBF20NGBT,
MHVFBF20NGT
20,000
Natural Gas Only
Battery ignitor (1-AA)
4.5 Inches of Water
14 Inches of Water
7 Inches of Water
120V, 60Hz , 1
Yes
36" (91.4cm)
10" (25.4cm)
3" (76.2cm)
36" (91.4cm)
6. Do not run heater:
• Where flammable liquids or vapors are used or stored
• During dusty conditions.
7. Before using furniture polish, wax, carpet cleaner or similar
products, turn heater off. If heated the vapors from these
products may create a white powder residue within burner
box or on adjacent walls or furniture.
8. Do not use heater if any part has been underwater.
Immediately call a qualified service technician to inspect
the room heater and to replace any part of the control
system and any gas control which has been underwater.
9. Operating heater above elevations of 4,500 feet could
cause pilot/ODS to shutdown heater.
DANGER: Carbon monoxide poisoning may lead to death.
Carbon Monoxide Poisoning:
Early signs of carbon monoxide poisoning resemble the flu,
with headaches, dizziness, or nausea. If you have these signs,
the heater may not be working properly. Get fresh air at
once! Have heater serviced. Some people are more affected
by carbon monoxide than others. These include pregnant
women, persons with heart or lung disease or anemia, those
under the influence of alcohol, and those at high altitudes.
Natural Gas:
Natural gas is odorless. An odor making agent is added to
natural gas. The odor helps you detect a natural gas leak.
However, the odor added to the gas can fade. Gas may be
present even though no odor exists. Make certain you read
and understand all warnings. Keep this manual for reference.
It is your guide to safe and proper operation of this heater.
3
Installation Instructions and Owner's Manual
MHVFBF30NGBT,
MHVFBF30NGT
30,000
Natural Gas Only
Battery ignitor (1-AA)
4.5 Inches of Water
14 Inches of Water
7 Inches of Water
120V, 60Hz , 1
Yes
36" (91.4cm)
10" (25.4cm)
3" (76.2cm)
36" (91.4cm)