Heatmaster HMDGJ, HMDGII User Manual
UNVENTED ROOM HEATER
INSTALLATION AND OPERATING INSTRUCTIONS
This heater is equipped with a PILOT LIGHT SAFETY SYSTEM designed to turn off the heater if not
enough fresh air is available.
DiamondGlo Heater
Models HMDGII and HMDGJ
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS
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Do not try to light any appliance.
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Do not touch any electrical switch; do not use any phone in your building.
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Immediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
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If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
WARNING: Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury or loss of life. Refer to
this manual for information. Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
16-1000 8/26/99 11:30 am
This is an unvented gas-fired heater. It uses air (oxygen) from the
room in which it is installed. Provisions for adequate combustion
and ventilation air must be provided. Refer to page 4 of these
instructions.
DO NOT TAMPER WITH PILOT LIGHT SAFETY SYSTEM
WARNING: If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or loss of life.
WARNING!
When used without fresh air, heater may give off CARBON MONOXIDE, an
odorless poisonous gas.
This heater is equipped with a PILOT LIGHT SAFETY SYSTEM designed to turn off the heater if not
enough fresh air is available.
If heater shuts off, do not relight until you provide fresh air.
If heater keeps shutting off, have it serviced by a qualified installer, service agency or the gas supplier.
Keep burner and control compartment clean.
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IMPORTANT: BEFORE BEGINNING INSTALLATION READ
COMPLETE INSTRUCTIONS CAREFULLY.
DO NOT TAMPER WITH PILOT LIGHT SAFETY SYSTEM
WARNING
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Due to high surface temperatures, the appliance should be located out of traffic and away
from furniture and draperies.
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Children and adults should be alerted to the hazard of high surface temperature and should
stay away to avoid burns or clothing ignition.
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Young children should be carefully supervised when they are in the same room as the
appliance.
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Do not place clothing or other flammable material near the appliance.
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Any safety screen or guard removed for servicing the appliance must be replaced prior to
operating the appliance.
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Installation and repair should be done by a qualified service person. The appliance should be
inspected and cleaned before use and at least annually by a professional service person.
More frequent cleaning may be required due to excessive lint from carpeting, bedding
material, etc. It is imperative that control compartments, burners and circulating air
passageways of the appliance be kept clean.
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Any change to this heater or its controls can be dangerous.
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Do not allow fans to blow directly into the heater. Avoid any drafts that alter burner flame
patterns.
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Do not use a blower insert, heat exchanger insert or other accessory not approved for use
with this heater.
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IMPORTANT INFORMATION
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This appliance must not be installed in a bedroom or bathroom.
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Do not use this room heater if any part has been under water. Immediately call a qualified
service technician to inspect the room heater and to replace any part of the control system
and any gas control system and any gas control which has been under water.
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WARNING: When used without fresh air, heater may give off CARBON MONOXIDE, an
odorless poisonous gas.
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Early signs of carbon monoxide poisoning resemble the flu. with headache, dizziness and/or
nausea. If you have these signs, heater may not be working properly. Get fresh air at
once! Have heater serviced.
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Some people - pregnant women, persons with heart or lung disease, anemia, those under
the influence of alcohol and those at high altitudes are more affected by carbon monoxide
than others.
ATTENTION INSTALLER:
REVIEW AND LEAVE THESE INSTRUCTIONS WITH CUSTOMER
FOR FUTURE REFERENCE.
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COMBUSTION AND VENTILATION PROVISIONS
WARNING: This heater shall not be installed in a confined space or unusually tight construction unless
provisions are provided for adequate combustion and ventilation air.
Confined Space and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1 defines a confined space as a space whose volume is less than
50 cubic feet per 1,000 Btu per hour (4.8m³ per kw) of the aggregate input rating of all appliances
installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet
per Btu per hour (4.8m³ per kw) of the aggregate input rating of all appliances in that space. Rooms
communicating directly with the space in which the appliances are installed, through openings not
furnished with doors, are considered a part of the unconfined space.
Unusually tight construction is defined as construction where
:
a. Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder
with a rating of 1 perm (6 x10-¹¹ kg per pa-sec-m²) or less with openings gasketed or sealed, and
b. Weather stripping has been added to openable windows and doors, and
c. Caulking or sealants are applied to areas such as joints around windows and door frames,
between sole plates and floors, between wall-ceiling joists, between wall panels, at penetrations
for plumbing, electrical and gas lines and at other openings.
Instructions for determining maximum Btu’s for a room
Step 1
This calculation is for combustion and ventilation air provisions only and is not intended to be used for
sizing for heating comfort. To determine the maximum Btu’s allowed for a given room size you will need
to calculate the volume of the room in cubic feet. To perform this calculation, fill in the table below and
multiply the room’s width, length and height to obtain the room volume in cubic feet.
Example:If your room is 20 feet in length, 16 feet wide and has an 8 foot ceiling height, the
calculation would be as follows: 20 x 16 x 8 = 2,560 cubic feet.
Step 2
Divide the room volume by 50 cubic feet to determine the maximum Btu’s per hour the room can
utilize.
Example:Using the above example: 2,560 cubic feet divided by 50 = 51.2 x 1,000 = 51,200 Btu’s.
If the rate of your appliance plus any other gas appliances installed in the space is rated at more Btu’s
than the example calculated above, you must follow instructions for confined space. See shaded
WARNING above. If your appliance is rated at less Btu’s than the example calculated above, then your
area is considered unconfined space.
WARNING: If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if the building is of unusually tight construction, provide adequate
combustion and ventilation air by one of the methods described in the National Fuel Gas Code,
ANSI Z223.1, Section 5.3 or applicable local codes.
ROOM
LENGTH
ROOM
WIDTH
ROOM
HEIGHT
ROOM VOLUME
IN CUBIC FEET
X X =
INSTALLATION INSTRUCTIONS
The installation of this appliance must conform with local codes or, in the absence of local codes with
the National Fuel Gas Code, ANSI Z223.1.
NOTE: Before the unit is connected to any gas line, check the name plate on the unit for the proper
gas type you will be using.
Do not install this appliance in a bedroom or bathroom.
This appliance is equipped with a control valve that has an internal regulator, and is not intended to regulate
any gas pressure above ½psig. If using LP gas, a low pressure regulator (not furnished) must be installed in
the gas line between the tank and appliance. Do not connect the appliance to the gas line if this regulator is
not in place. If using natural gas, check with the gas company to insure that proper gas pressure is available.
GAS PRESSURE: Minimum inlet gas supply pressure must be 5.0” WC for natural gas or 11” WC for
LP gas for the purpose of input adjustment. Maximum inlet gas supply pressure must not exceed 10.5”
WC for natural gas, or 13” WC for LP gas. The gas line supplying the appliance must be sufficient size
to furnish the appropriate supply pressure to the appliance when being operated on the high setting.
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The appliance and its appliance main gas valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of ½
psig (3.5kPa).
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The appliance must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than ½psig (3.5kPa).
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Always keep appliance area clear and free from combustible materials, gasoline and other
flammable vapors and liquids.
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Pressure tap screws must be closed before turning on gas to appliance.
HEATER CLEARANCES FROM COMBUSTIBLES:
The minimum clearances to any combustible surface are: 1 inch from the left and right sides, 4 inches
from the rear, 24 inches from the front and 24 inches from the top of the heater. The left and right side
clearances are measured from the outside edge of the top of the heater. The front clearance is measured
from the front of the cabinet and the top measurement is measured from the top of the heater. The rear
clearance is measured from the back panel of the heater.
CLEARANCES AROUND AIR OPENINGS:
Do not place any material or store any objects behind the heater. After installation of the heater, do not
block the open area behind the heater in any way.
HEATER CLEARANCES FOR SERVICING:
The minimum clearances for servicing the heater are: 18 inches from the right side and 18 inches from
the rear of the heater.
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This appliance may be installed in an aftermarket permanently located manufactured (mobile)
home, where not prohibited by state or local codes.
Aftermarket: Completion of sale, not for the purpose of resale, from the manufacturer.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance is
not convertible for use with other gases.
ASSEMBLY INSTRUCTIONS
NOTE: It is recommended by the manufacturer that a qualified individual install this appliance.
Your new DiamondGlo heater is shipped in one box and the logs are shipped in a separate box. Packed
with the DiamondGlo heater is a thermostat that must be hooked to the appliance before it is operated.
Please follow the instructions on page 7 for the installation of this thermostat.
1. Remove DiamondGlo heater from the box by cutting bands around the box and lifting the box off
the heater.
2. Lift heater from the bottom of the box and place near the final location of the heater. CAUTION:
Lift heater when moving. Do not slide heater on the floor.
3. Locate thermostat that was packaged with the heater and see instructions on page 7 of these
instructions for installation of the thermostat.
4. The manufacturer has furnished a 3/8” flare brass fitting for connection to the gas line. If the gas
line is anything but a 3/8” flare connection, this fitting must be changed to the appropriate fitting by
the installer.
5. Connect the gas line to the fitting located at the back of the heater.
6. Remove the screen from the front of the heater by removing the screw from the middle top of the
screen, and pulling the screen off by pulling on the two brass knobs located on the bottom of the
screen.
7. Place the heater in its final location.
8. Make sure all gas connections are tight. Turn on gas and coat each joint with a soap and water
solution and watch for air bubbles which will indicate leaks. Any leaks must be corrected before
proceeding with installation. DO NOT USE A FLAME OR ANY IGNITION SOUR
CE TO
CHECK FOR LEAKS.
9. Your DiamondGlo heater was leak tested before it left the factory, but it is recommended to check
all connections for leaks.
10. Remove logs from box. Notice the notches in the larger logs and the numbers on the bottom of the
same logs. The log placement is very important to the safe operation of the appliance.
11. NOTE: For correct log placement, match the log placement photo in this manual with the model number
of your heater. The logs MUST be placed exactly as shown. If there is any evidence of carbon or blackening
on the logs, they may be incorrectly placed. There should not be any carbon or blackening on the logs at
any time.
12. Place the back log in the grooves on the elevated cradle toward the back of the grate making sure
the grooves in the bottom of the log fit on the cradle.
13. Place the middle log in the grooves on the center elevated section of the cradle making sure the
grooves in the bottom of the log fit on the cradle. This will position the middle log between the
burner.
14. Place the front log on the front of the grate in front of the cradle making sure the grooves on the
bottom and front of the log fit the bars on the grate.
15. Place the small top logs in the grooves on top of the front and back log, making sure these logs lay
across the middle log in the appropriate groove.
16. Match the model number of your heater with the heater model number on page 12 of this
instruction manual. The log placement should look like this. If it doesn’t, follow steps 10 through 16
above.
17. Replace the front screen on the heater by sliding the two sides into the notches and replacing the
screw in the top middle of the screen.
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