Mr. Heater MH25NG/LP, HS25NG/LP owner manual General Information, BTU Ratings and Supply Pressures

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:

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 Related Subject

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.

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 E4 Installation instructions and Owner’s Manual