Mr. Heater MH25LP, MH25NG User Manual
Installer: Leave this manual with the appliance. Consumer: Retain this manual for future reference.
OPERATING INSTRUCTIONS AND OWNER’S MANUAL
MR. HEATER
MODEL
MH25NG
MH25LP
GAS FIRED INFRA-RED WORKSHOP HEATER
READ INSTRUCTIONS CAREFULLY: Read and
follow all instructions. Place instructions in a
safe place for future reference. Do not allow
anyone who has not read these instructions to
assemble, light, adjust or operate the heater.
HEATSTAR
MODEL
HS25NG
HS25LP
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.
- 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
• Shut off gas supply
• Do not try to light any appliance
• Do not touch an 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 the fire department.
- Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
WARNING: 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 Fresh Air for Combustion and
Ventilation section on page 3 of this manual.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage,
injury or death. Read the installation, operation, and maintenance instructions thoroughly before installing or
servicing this equipment. For assistance or additional information consult a qualified installer, service agency, or
gas supplier.
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 · 216-916-3000
18673 Rev. D 06/06
WARNINGS
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause
property damage, injury or death. Read the
installation, operation, and maintenance instructions thoroughly before installing or servicing this
equipment. For assistance or additional information consult a qualified installer, service agency, or
gas supplier.
WARNING: When used without fresh air, heater
may give off CARBON MONOXIDE, an odorless
poisonous gas. OPEN WINDOW AN INCH OR
TWO FOR FRESH AIR WHEN USING HEATER.
WARNING: This heater is equipped with a PILOT
LIGHT SAFETY SYSTEM. DO NOT TAMPER
WITH PILOT LIGHT SAFETY SYSTEM.
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.
CAUTION
• Never connect gas valve or thermostat to line voltage
or a transformer.
• If the infra-red color of the grid becomes dull when the
building furnace is operating, consult gas supplier on
correct gas supply piping sizes.
• This heater is for indoor installation only!
WARNING: If heater shuts off, do not relight until
you provide fresh air. If heater keeps shutting off,
have it serviced. Keep burner and control clean.
Open door for 5 minutes.
Maintain clearances as shown in Figure 2 or on
heater nameplate.
• DO NOT USE MATCH OR OTHER FLAME
FOR LEAK TESTING.
• DO NOT EXCEED 1/2 PSI INLET PRESSURE
TO HEATER.
NOTE
Gasket binder material used in this heater assembly will
temporarily emit an odor and/or vapor. This condition will
clear up in approximately 20 minutes and thereafter will
not reoccur. Refer to Chapter 2 for ventilation.
TABLE OF CONTENTS
Chapter Title Page
I Introduction ............................................ 3
II Heater Installation .................................. 5
III Heater Operating Instructions ................. 10
IV Operator Maintenance Instructions ......... 12
V Replacement Parts List.......................... 15
Model # MH25NG/LP HS25NG/LP
Installation instructions and Owner’s Manual
2
CHAPTER I
INTRODUCTION
1. EQUIPMENT
This heater is the consumer version of a highly successful, thoroughly tested, gas fired, infrared, industrial utility
heater.
This heater does not require an external electrical source
for operation.
The major components of the heater and a typical
installation are identified in Figure 1. The basic heater
GAS CONTROL
VALVE
POWERPILE
GENERATOR
consists of the complete burner assembly, flue deflector,
grid, reflector assembly and face guard.
2. PURPOSE OF EQUIPMENT
WARNINGS
This heater is for indoor installation only.
This heater is designed to heat indoor areas. Do not
use for inhabited or small, enclosed areas.
This heater is an ideal selection when a simple and
easily installed method of heating a utility building is
required.
EXHAUST
VENT
THERMOSTAT
CABLE
THERMOSTAT
Figure 1. Heater Major Components
3. MODELS COVERED IN THIS MANUAL
Model MH25NG/HS25NG is for use where natural gas is
intended fuel source. Model MH25LP/HS25LP is for use
where propane gas is the intended fuel source.
4. MANUAL USE
• The procedures and information contained within
this manual will allow purchaser of this heater to
install and maintain the heater safely and
efficiently.
BASIC HEATER
WALL MOUNTING
BRACKET
• The cover and the following page provide a safety
summary that attempts to gather all the warnings used within the manual in one location.
• A table of contents is provided for easy reference
to any portion of the manual.
• Chapter 1 provides general information on the
use of this manual and on the heater.
Model # MH25NG/LP HS25NG/LP
Installation instructions and Owner’s Manual
3
• Chapter 2 provides heater installation requirements
and information, such as: a) minimum distances
from heater components to combustible materials,
b) heater mounting requirements, c) venting
requirements, d) fuel supply requirements, e)
thermostat mounting.
• Chapter 3 covers startup, operation, and shutdown
of the heater.
• Chapter 4 provides operator maintenance instruc-
tions such as: troubleshooting, adjustments,
powerpile replacement and operator checks.
• Chapter 5 provides warranty and replacement
parts information.
5. GENERAL INFORMATION
• Your heater comes fully assembled and is tested
at the factory with the appropriate type of gas and
at the input pressures stated on the nameplate.
• Upon receipt and prior to attempting installation,
be sure to inspect the heater and its packaging for
damage and/or missing components. If damage is
found or missing components are suspected,
contact your dealer. See Chapter 5 for a complete
listing of items required for the safe and efficient
installation and use of this heater.
• Never attempt to operate the heater using a fuel
other than that specifically identified on the
nameplate.
• The installation of the heater must conform with all
local building codes or, in absence of governing
local codes, with the National Fuel Gas Code,
ANSI Z223.1 (NFPA 54). This code can be obtained from either the: Canadian Standards
Association, 8501 East Pleasant Valley Road,
Cleveland, OH 44131; or, NFPA, Battery March
Park, Quincy, MA 02269.
• Canadian installations must comply with CAN/
CGA-B149.1.2 gas code which can be purchased
from Canadian Gas Association, 55 Scarsdale
Road, Don Mills, Ontario M3B 2R3.
• Contact factory when appliance is to be installed at
high altitudes. Factory supply high altitude conversion kit with instructions and data plate.
• A plugged 1/8" N.P.T. Test Gage Connection is
provided on the heater gas control.
• See Tables 1 and 2 for heater specifications:
WARNING: Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
injury or death. Read the installation, operation, and
maintenance instructions thoroughly before installing or
servicing this equipment. For assistance or additional
information consult a qualified installer, service agency,
or gas supplier.
• For additional information contact:
The factory.
• The following extra NFPA Manuals are helpful when
installing this heater in a location not anticipated in
this manual:
Number Related Subject
NFPA 88 Clearances to Combustible Surfaces
NFPA 409 Clearances to Combustible Surfaces
DO NOT EXCEED 1/2 PSI INLET PRESSURE TO HEATER
Table 1. BTU Ratings and Supply Pressures
MODEL BTU/HR. RATING GAS SUPPLY PRESSURE (W.C.) ORIFICE
NO. GAS MIN. MAX. MANIFOLD SIZE
NATURAL PROPANE NAT. L.P. NAT. L.P. NAT. L.P. NAT. L.P.
MH/HS25NG 25,000 — 7.0" — 14" — 6" — 45 —
MH/HS25LP — 22,000 — 11" — 14" — 10" — 55
Table 2. Heater Dimensions and Orifice Sizes
MODEL OPERATING ORIFICE SIZE INPUT SIZE
NO. PRESSURE BURNER PILOT BTU/H WIDTH LENGTH HEIGHT WEIGHT
MH/HS25NG 6.0"w.c. 45 .018 25.000 12-1/4" 29-3/4" 7" 20 lb.
MH/HS25LP 10"w.c. 55 .011 22,000 12-1/4" 29-3/4" 7" 20 lb.
Model # MH25NG/LP HS25NG/LP
Installation instructions and Owner’s Manual
4
Provide adequate clearance to combustibles per Table 3 at
control end of heater for servicing and minimum on top and
sides for ventilation and combustion air supply.
A minimum clearance of 8’ above floor for public garages in
accordance with NFPA No. 88 most recent edition, or
Figure 1; whichever is larger.
Canadian installations in public garages must comply with
CGA 149B.1.9 most recent edition.
WARNING: Maintain clearances as shown in Figure 2
or on heater nameplate.
CHAPTER II
HEATER INSTALLATION
1. GENERAL INSTALLATION INFORMATION
AND REQUIREMENTS
• The required minimum clearances to combustible
surfaces are illustrated in Figure 2 and Table 3.
As shown on Figure 2, the front of the heater is
installed at the minimum required clearance to
combustible surfaces and toward open space,
and then the other sides must have a minimum
clearance of 16 inches to combustible surfaces.
16”
MINIMUM
14-1/2”
EXHAUST
VENT
30
CEILING
14”
MINIMUM
48”
MINIMUM
OPEN
WORKSHOP DOOR
16”
MINIMUM
HEATER
WALL
BRACKET
NOTE:
1. ONLY FLUE SIDE OF HEATER CAN
BE ELEVATED (30o).
2. HEATER SIDE REFLECTOR MUST
BE HORIZONTAL.
FLOOR LINE
Figure 2. Installation Clearances to Combustible Surfaces
Table 3. Installation, Ventilation and Mounting Information
BTU/HR. RATING NORMAL
MODEL GAS MOUNTING CLEARANCES TO COMBUSTIBLE SURFACES
NO. NAT. L.P. POSITION TOP SIDES BACK BELOW
MH/HS25NG 25,000 — 30
MH/HS25LP — 22,000 30
Model # MH25NG/LP HS25NG/LP
o
o
14" 16" 16" 48"
14" 16" 16" 48"
Installation instructions and Owner’s Manual
5
• This heater may be mounted on any wall;
however, it is recommended that the heater be
mounted in the middle of the wall opposite any
overhead doors.
• When selecting installation locations for this
heater ensure that the opening of any exterior or
interior doors or windows will not violate minimum clearances or contact any heater components.
• If an overhead door is installed in the building,
verify that the heater is not installed in such a
way as to interfere with door operation and verify
that the door in its open position will not reduce
clearances below the minimum requirements.
Never mount the heater in such a way that
would position the heater above an opened
overhead door.
• In most cases the infiltration around your
uninsulated entry doors and windows will provide
enough air flow for efficient heater operation.
department at 1-800-251-0001.
The selection of the thermostat mounting location is
critical to efficient and effective heater operation.
• The thermostat should be mounted about 5 feet
above the floor where air can circulate freely
around it.
• The thermostat should not be mounted directly
to a cold exterior wall without an insulated
mounting block.
• The thermostat should not be mounted in direct
drafts.
• The thermostat should not be mounted directly
below the installed the heater.
• The thermostat should not be installed at a
distance that is farther from the heater than the
length of the thermostat cable.
Unrestricted air flow during heater operation is essential
to prevent the area above the installed heater from
overheating. If your workshop/utility building is tightly
insulated (including windows, doors, openings, etc.) the
following ventilating methods
must be followed:
• A single exhaust vent is supplied with your
heater for your convenience. This vent must be
located above the heater (preferably at the
highest point in the building interior) and it must
vent to the exterior of the building. An additional
vent is available from the factory for those having
a finished workshop or utility building.
• An intake vent, or equivalent, from the exterior of
the building and having an effective area of 75
square inches must be located below the heater
(preferably within 2 feet of the building’s floor).
• Openings equivalent to intake vent would be:
partially open doors and partially open windows.
• Openings of this size (5 inch by 13 inch, or 3
inch by 25 inch) will prevent dangerous heat
buildup above the heater.
Ensure that no gas lines or electrical wiring or conduits
will interfere with mounting of the heater to the wall.
Depending on local codes and requirements and the
installer’s skill level, the sizing and installation of gas
lines required to supply the heater may require the
assistance of a professional. If in doubt as to these
requirements, discuss the requirements of this manual
with the dealer from whom the heater was purchased
and your gas supplier, or call our customer service
2. HEATER MOUNTING INSTRUCTIONS
After selecting the heater installation location and the
thermostat location and after verifying and ensuring that
all of the above placement requirements are fulfilled,
mount the heater as follows:
A. Determine how you wish to install the vent based on
the construction of the building and your personal
preference. (i.e., do you wish the flanged (finished)
side on the interior or the exterior of the building or
do you want two vents so that both exterior and
interior will be finished?) If needed, order an
additional vent from the factory. Our address and toll
free phone number are on the rear cover of this
manual. Install the vent as follows:
1. See Figure 3 for dimensions and information on
the vent.
2. Select a place as high above the heater as
possible in accordance with the above requirements and ensure that the vent or vents will not
contact or interfere with existing building systems (i.e., ducts, wiring, plumbing, etc.)
3. Place the unfinished side of the vent against the
wall in its elected location and trace its dimensions on the wall with a pencil or other suitable
marker.
4. Cut or otherwise open a hole in the wall, or walls
for finished buildings, having the dimensions of
the unfinished side of the vent.
5. Install the vent or vents as desired and retain
with 4 suitable fasteners through the predrilled
holes in vent flange.
Model # MH25NG/LP HS25NG/LP
Installation instructions and Owner’s Manual
6
B. Prepare to install the heater wall mounting bracket
as follows:
1. If the wall mounting bracket is to be attached to
a stud and wallboard wall, refer to Figure 3 for
dimensions, locate a stud, and drill two 1/8" pilot
holes into the stud centerline. Use template for
simplified installation.
2. If the wall mounting bracket is to be attached to
a brick or masonry wall, refer to Figure 3 for
dimensions. Obtain two 1/4 inch (inside
diameter)expansion anchors and determine the
correct drill size to be used with them. Drill
the appropriate size holes in the brick or masonry to accept the anchors.
C. Place the wall mounting bracket on the wall and
align the two through holes on the bracket with the
pilot holes or anchors. Install 1/4 inch by 2-1/2 inch
lag screws through the bracket into the stud or
anchors. Tighten securely.
D. Locate heater mounting clip on back of heater and
select the 1/4" – 20 by 3/4" hex head bolt and 1/4" 20 hex nut.
E. Position the heater as shown in Figure 3 and slide
the heater mounting clip over the bracket and install
the bolt through the clip and bracket.
F. Thread the hex nut onto the bolt and tighten
securely.
G. Ensure that the selected thermostat location meets
all of the above requirements. Refer to the
instructions that come with the thermostat for
additional grounding information and mounting
instruction.
H. If the wall is of stud and wallboard construction, then
use the #6 by 1 inch sheet metal screws, included
with the thermostat, and mount the thermostat in the
selected location.
I. If wall is brick or masonry, the appropriate anchors
must be obtained to accommodate thermostat
mounting screws. Use the back plate of the
thermostat as a template to mark the hole locations,
drill appropriate size anchor holes, install the
anchors, securely attach the thermostat using the
mounting screws.
J. Connect thermostat wires to gas valve as shown in
Figure 4.
24” MIN
HEATER WALL
MOUNTING
BRACKET
9”
1/4” X 2-1/2” LONG
LAG SCREWS
(2 REQUIRED)
CEILING
HEATER
1/4”-20x3/4”
HEXHEAD BOLT
GAS
CONTROL
VALVE
Figure 3. Heater Mounting Information
MOUNTING
CLIP
1/4”-20
HEX NUT
FLUE
DEFLECTOR
HEATER
REFLECTOR
1/2” NPT GAS INLET
(DO NOT EXCEED 1/2 PSI)
THERMOSTAT CABLE
(SEE FIGURE 4)
58”
FLOOR
Model # MH25NG/LP HS25NG/LP
#6 X 1” SHEET METAL SCREWS
(2 REQUIRED - INCLUDED WITH
THERMOSTAT)
UNFINISHED
SIDE
THERMOSTAT (SEE INSTRUCTIONS
INCLUDED WITH THERMOSTAT
Installation instructions and Owner’s Manual
7
FINISHED
SIDE
FLANGE
PREDRILLED
HOLES
THERMOSTAT
• To ensure the best performance from your LP gas
heater, make sure the supply manifold pressure is
at least 1/2 psi (14 in W.P.).
POWERPILE GAS VALVE
POWERPILE GENERATOR
Figure 4. Connection Diagram
Refer to National Electrical Code NFPA70-1993 and for
Canadian installations to current CODE C22.1-
3. CONNECTING HEATER TO GAS SUPPLY
WARNING: Depending on local codes and require-
ments and the installer’s skill level, the sizing and
installation of gas lines required to safely and efficiently
supply the heater may require the assistance of a
professional. If in doubt as to these requirements,
discuss the requirements of this manual with the dealer
from whom the heater was purchased and your gas
supplier.
3.2 Piping Requirements
All piping installed must comply with local codes and
ordinances or with National Fuel Gas Code,
ANSI Z223.1 (NFPA 54), whichever takes precedence.
When installing piping, the following requirements must be
taken into consideration: Canadian installations must
comply with the B149.1.2 Gas Code.
• Use new properly reamed black pipe free from
chips.
• Apply a good quality pipe compound to all male
threads as shown in Figure 5 prior to assembly. If
LP gas is the fuel, ensure that pipe compound is
resistant to LP gas. Do not use Teflon™ tape.
USE MODERATE AMOUNT OF PIPE DOPE
LEAVE 2 THREADS BARE
3.1 Gas Supply Requirements
• See Tables 1 and 2 for gas supply minimum,
maximum, operating, and manifold pressures for
both heater models. Pressures are provided in
inches of W.C. (water column). Also, see heater
rating plates located on the heater.
WARNING: Model MH/HS25NG is designed to burn
natural gas and it comes equipped with a regulator. The
regulator is built into the gas valve. The maximum inlet
pressure to this regulator is 1/2 psi (14 in. W.C.) If gas
line pressure exceeds 1/2 psi, then an additional
regulator must be installed before the heater/regulator
to step down the pressure to a maximum of 1/2 psi.
• Most residential natural gas services provide a line
pressure of 4 oz. (6.9 in. W.C.). If in doubt consult
your natural gas supplier.
• To ensure the best performance from your natural
gas heater make sure the supply manifold pressure is at least 6" W.C.
WARNING: Model MH/HS25LP is designed to burn
liquefied petroleum (LP) gas and it comes equipped
with a regulator. The regulator is built into the gas valve.
The maximum inlet pressure to this regulator is 1/2 psi
(14 in. W.C.). If gas line pressure exceeds 1/2 psi, then
an additional regulator must be installed before the
heater/regulator to step down the pressure to a maximum of 1/2 psi.
Figure 5. Pipe Compound Application
• Male threads on pipe to be installed into gas valve
shall meet the requirements of Figure 6. Threads
longer than those shown in the figure may cause
gas valve distortion and malfunction.
• A sediment trap meeting the typical requirements
of Figure 7 shall be installed in the line to the gas
valve.
• A dedicated shutoff valve for the heater must be
installed in the gas supply line.
3.3 Piping Installation
While ensuring that all of the above gas supply require-
3/4” MAXIMUM
THREAD LENGTH
1/2” BLACK PIPE
GAS VALVE BODY
1/2” MAXIMUM
DEPTH OF INSERTS
INTO GAS VALVE
Figure 6. Gas Valve Connection Requirements
Model # MH25NG/LP HS25NG/LP
Installation instructions and Owner’s Manual
8
ments and piping requirements are fulfilled, install piping
as follows:
A. In accordance with the above piping requirements,
assemble piping, sediment trap, shutoff valve, and
necessary fittings. Tighten all components securely.
WARNING: Failure to ensure that male threads on
pipe to be installed into gas valve meet the requirements of Figure 6 may cause gas valve damage,
distortion and malfunction.
B. Install a threaded nipple, prepared in accordance
with paragraph 3.2 into gas valve.
C. Connect gas piping to nipple installed in the gas
valve.
SUPPLY
LINE
WARNING: When testing gas piping use only a soap
and water solution. Do not use a match or other flame
for leak testing. If during leakage check gas is
smelled, turn off the gas supply and ventilate building.
D. Ensure the building is properly ventilated. Without
lighting the pilot light of the heater, open the gas
supply valve and pressurize the piping up to the
heater’s gas valve.
E. Using a brush, apply a soap and water solution to all
connections and look for bubbles indicating a leak. If
a leak is detected, turn off gas supply and tighten
connections. Retest and tighten connections until no
more leaks are found.
1/2”
TEE
3”
CAP
SHUTOFF
VALV E
NIPPLE
RIGID PIPE WITH
UNION OR A FLEXIBLE
CONNECTOR TO HEATER
HEATER
NOTE:
1. ONLY USE A PIPE COMPOUND
WHICH IS RESISTANT TO
LIQUIFIED GASES ON LP
INSTALLATIONS.
2. FITTINGS SHOWN ARE NOT
INCLUDED WITH HEATER.
Figure 7. Typical Piping Installation
Model # MH25NG/LP HS25NG/LP
Installation instructions and Owner’s Manual
9
CHAPTER III
HEATER OPERATING
INSTRUCTIONS
NOTE
Gasket binder material used in this heater assembly
will temporarily emit an odor and/or vapor. This condition will clear up in approximately 20 minutes and
thereafter will not reoccur. Refer to Chapter 2 for
ventilation.
1. OPERATING SAFETY INSTRUCTIONS
WARNING: When used without fresh air, heater may
give off CARBON MONOXIDE, an odorless poisonous gas. OPEN WINDOW AN INCH OR TWO FOR
FRESH AIR WHEN USING HEATER.
WARNING: This heater is equipped with a PILOT
LIGHT SAFETY SYSTEM. DO NOT TAMPER WITH
PILOT LIGHT SAFETY SYSTEM.
WARNING: If heater shuts off, do not relight until you
provide fresh air. Open door for 5 minutes. If heater
keeps shutting off, have it serviced. Keep burner and
control clean.
WARNING: CARBON MONOXIDE POISONING MAY
LEAD TO DEATH. 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.
WARNING: DO NOT USE MATCH OR OTHER
FLAME FOR LEAK TESTING.
CAUTION: If the infra-red color of the grid becomes
dull when the building furnace is operating, consult
gas supplier on correct gas supply piping sizes.
CAUTION: This heater is for indoor installation only!
2. HEATER STARTUP
WARNING: During heater startup ensure that
building is well ventilated.
A. Open the gas supply valve or valves.
B. Set the thermostat to the OFF position.
See Figure 8.
FIGURE 8. THERMOSTAT CONTROLS
C. If the manual gas control knob on the gas valve is
not in the OFF position, partially depress the knob
and rotate to the OFF position. See Figure 9.
MANUAL GAS
CONTROL KNOB
WRENCH
BOSS
GAS
INLET
Model # MH25NG/LP HS25NG/LP
PRESSURE
REGULATOR
ADJUSTMENT
PILOTSTAT
POWER UNIT
PILOT FLOW ADJUSTING SCREW
(BENEATH COVER SCREW)
Figure 9. Gas Valve Components
Installation instructions and Owner’s Manual
10
STANDARD
PRESSURE
REGULATOR
PILOT GAS OUTLET
(PRESSURE TAPPING
DIRECTLY BENEATH)
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