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3. 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 name-
plate.
•
Upon receipt and prior to attempting installation,
be sure to inspect the heater and its packaging
for damage and/or missing components. If dam-
age is found or missing components are sus-
pected, 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 gov-
erning 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 can 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:
MODEL
BTU/HR. RATING
NO.
NATURAL
MH/HS25NG
25,000
MH/HS25LP
—
MODEL
OPERATING
NO.
PRESSURE
MH/HS25NG
6.0"w.c.
MH/HS25LP
10"w.c.
Model # MH25NG/LP
Table 1. BTU Ratings and Supply Pressures
GAS
MIN.
PROPANE
NAT.
—
7.0"
22,000
—
Table 2. Heater Dimensions and Orifice Sizes
ORIFICE SIZE
BURNER
PILOT
45
.018
55
.011
HS25NG/LP
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause property
damage, injury or death. Read the installation, opera-
tion, 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 Mr. Heater Toll-
Free 800-251-0001—www.mrheater.com
The following extra NFPA Manuals are helpful when
installing this heater in a location not anticipated in this
manual:
Number
NFPA 88
Clearances to Combustible Surfaces
NFPA 409
Clearances to Combustible Surfaces
DO NOT EXCEED 1/2 PSI INLET PRESSURE TO HEATER
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.
GAS SUPPLY PRESSURE (W.C.)
MAX.
L.P.
NAT.
L.P.
—
14"
—
11"
—
14"
INPUT
BTU/H
WIDTH
LENGTH
25.000
12-1/4"
29-3/4"
22,000
12-1/4"
29-3/4"
Installation instructions and Owner's Manual
E4
Related Subject
ORIFICE
MANIFOLD
SIZE
NAT.
L.P.
NAT.
L.P.
6"
—
45
—
—
10"
—
55
SIZE
HEIGHT
WEIGHT
7"
20 lb.
7"
20 lb.
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