Modine Manufacturing HD, HDS, HDB, HDC Owner's Manual
6-577.5
5H75225A
July, 2010
RESIDENTIAL OWNER’S MANUAL
gas-fired unit heaters
models HD, HDB, HDS, and HDC
All models approved for use in California by the CEC,
in New York by the MEA division, and in Massachusetts.
Unit heater is certified for residential and commercial
applications.
WARNING
Improper installation, adjustment,
alteration, service or maintenance can
cause property damage, injury or death,
and could cause exposure to substances
which have been determined by various
state agencies to cause cancer, birth
defects or other reproductive harm.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion
may result, causing property damage,
personal injury or death.
CAUTION
To prevent premature heat exchanger
failure do not locate ANY gas-fired units
in areas where chlorinated, halogenated
or acid vapors are present in the
atmosphere.
IMPORTANT
All installation and service of these
units MUST be performed by a qualified
installation and service agency.
FOR YOUR SAFETY
The use and storage of gasoline or other
flammable vapors and liquids in open
containers in the vicinity of this appliance
is hazardous.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
• Open windows.
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier,
call your fire department.
THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.
IMPORTANT
All installation and service of these
units MUST be performed by a qualified
installation and service agency.
INTRODUCTION AND GENERAL COMMENTS GENERAL OPERATIONAL INFORMATION
Congratulations on Your New Purchase
Thank you for choosing Modine’s low profile, Hot DawgTM unit
heater. We are convinced that you will be pleased with the
design and quality of this heater. You should receive years of
trouble-free heat and comfort from the Hot Dawg with proper
maintenance and care.
Keep the Heater Area Clear:
1. Do not use the area around the heater for storage.
2. Never obstruct the air openings into the heater.
3. Never place any items (paper, tools, etc.) on top of the
heater. There are air openings on the top of the heater.
4. Do not place any combustible materials (paper, wood,
cloth, etc.) next to the heater or vent.
Supply Air:
1. Make certain that the fan guard in the rear of the heater is
unobstructed.
2. For optimum performance, do not completely close the
deflector blades. If needed, adjust the deflector blades
slightly to direct the air towards the ground.
3. When initially started in a cold environment, the air coming
out of the heater may not feel warm. As the temperature
in the environment increases, and as the heat exchanger
tubes become hot, the air temperature coming out of the
heater will increase.
Combustion Air: (Power Vented Unit Only)
This gas-fired unit heater must be supplied with adequate
combustion air. Today’s current construction techniques, which
result in tighter homes and buildings (or significantly less air
infiltration from the outside), makes it more important than
ever that heating equipment have adequate combustion air.
The installer of this unit heater has determined what it takes
to be assured that your unit heater has adequate combustion
air. If this heater has been installed in a confined space, two
permanent openings (one near the top of the enclosure and
one near the bottom) have been provided. These two openings
must freely communicate with areas having adequate
combustion infiltration from the outside. Do not block or alter
in any way the combustion air openings.
It is very important to abide by the following:
1. Do not block or alter in any way the combustion air
openings.
2. Refrain from creating excessive amounts of dust near the
heater (i.e. saw dust from sanding, cutting, etc.)
3. Do not use or store corrosive chemicals in the area near the
heater (these include pool chlorine, fertilizers, etc.)
4. Refrain from prolonged use of ventilation fans or hoods as
this may deplete the amount of combustion air.
Start Up - General
Before start up, it is important to read the “For Your
Safety Read Before Operating” message below. This
message also appears on the access cover of your
Hot Dawg gas-fired unit heater. The message follows:
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly,
a fire or explosion may result causing property damage,
personal injury or death.
A. This appliance does not have a pilot flame. It is equipped
with an ignition device which automatically lights the burner.
B. BEFORE OPERATING smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
• Donottrytolightanyappliance.
• Donottouchanyelectricswitch;donotuseanyphonein
your building
• Immediatelycallyourgassupplierfromaneighbor'sphone.
Follow the gas supplier’s instructions.
• Ifyoucannotreachyourgassupplier,callthefire
department.
C. Use your hand to move the gas control switch. Never use
tools.Iftheswitchwillnotmove,don’ttrytorepairit;call
a qualified technician. Force or attempted repair may
result in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect
the appliance and replace any part of the control system
and any gas control which has been under water.
The control operating sequence of your gas-fired unit
heater is as follows:
• Uponacallforheatfromthethermostat,powerissupplied
to the power exhaust motor.
• Theunitwillgothroughapre-purgeperiod.
• Theigniterprovidesfortheestablishmentoftheflamewhile
the main valve in the control opens to allow gas flow to the
burners.
• Ifthefanmotorhasnotalreadystarted,itwillstartshortly.
• Ifaburnerflameisnotsensedforanyreason,themain
valve will close and there will be a short purge period before
ignition is tried again.
• Iftheflameisnotsensedafterfourtriestherewillbeatleast
a one hour wait before ignition is tried again.
Shut Down - General:
TO TURN OFF GAS TO APPLIANCE
1. Set thermostat to lowest setting.
2. Turn manual shut-off valve located outside of the unit to
the closed position (see Figure 1).
3. Turn off all electric power to the appliance if service is to
be performed.
4. Remove access panel.
5. Turn the gas valve switch to the “OFF” position.
6. Replace the access panel.
2
IMPORTANT
GAS
SUPPLY LINE
GAS
SUPPLY LINE
GROUND
JOINT
UNION
W/ BRASS
SEAT
MANUAL GAS
SHUT-OFF VALVE
3"
MIN.
SEDIMENT
TRAP
PLUGGED
1/8" NPT TEST
GAGE CONNECTION
TO
CONTROLS
All installation and service of these
units MUST be performed by a qualified
installation and service agency.
TROUBLESHOOTING INFORMATION MAINTENANCE
General
There are a few troubleshooting items that you may perform.
They are listed below. All other troubleshooting MUST BE
PERFORMED BY A QUALIFIED INSTALLATION AND
SERVICE AGENCY.
If the heater does not light .....
1. Make sure the thermostat is set above room temperature.
2. Make sure there is power to the heater (check the circuit
breaker).
3. Make sure the main gas supply is on (check the manual
shut-off valve outside the unit and make sure it is in the
open position - see Figure 1).
4. If none of the above solve the problem, contact a qualified
installation and service agency.
Air feels cold coming out of the heater .....
1. Make sure the burner lit. If it didn’t, refer to "If heater does
not light" above.
2. If the room WAS cold, it will take a while for the air coming
out of the heater to feel warm.
3. If the air coming out of the heater continues to feel cold
after 5 minutes and the room is not warming up, contact a
qualified installation and service agency.
Figure 1
Recommended Piping to Controls
It is recommended that a qualified installation and
service agency inspect the heater and vent system
prior to each heating season.
There are no components behind the service access door that
are serviceable by the homeowner, however, there are a few
checks that you can do:
(REMEMBER TO ALWAYS TURN OFF THE POWER AND
SET THERMOSTAT TO THE LOWEST SETTING BEFORE
PERFORMING ANY MAINTENANCE TO THE HEATER)
1. Periodically dust and clean the heater.
2. Periodically remove the dust from the fan blades.
3. Remove the deflector blades and vacuum inside the heat
exchanger area.
4. The motors on the heater (power exhaust and fan) do
NOT require oiling. They are permanently lubricated at the
factory. DO NOT attempt to oil the motors.
• Manualshut-offvalveisin“off”positionwhenperpendiculartopipe.
3
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