Mr. Heater MH25LP / MH25NG General Information, BTU Ratings and Supply Pressures, Nfpa

•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.

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:

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,

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 4 Installation instructions and Owner’s Manual