Mr. Heater GAS FIRED INFRA-RED WORKSHOP HEATER MH25LP / MH25NG - Manuel (Page 4)

• 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 ob-
tained 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 conver-
sion 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.
4
Installation instructions and Owner’s Manual Model # MH25NG/LP HS25NG/LP