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E3
Installation Instructions and Owner’s Manual
Model # MH40NG/LP
1. GENERAL INFORMATION
a. Your heater comes fully assembled and is tested at the factory
for proper gas and input as stated on the name plate.
b. Before proceeding with the installation, be sure to inspect for
damages. Freight company must be notified of any damages
and request that the inspection be made. MR. HEATER will
send replacement parts for damaged parts only after receiving
a signed inspection report to prove the liability of the freight
company.
c. Do not attempt to operate heater with any other gas than that
indicated on the heater name plate.
d. The installation of heater must conform with local building
codes, or in absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1a/NFPA54, and Standard for Storage and
Handling of Liquefied Petroleum Gases, ANSI/NFPA 58.
e. Canadian installations must comply with CAN/CGA-B149.1.2
Gas Code which can be purchased from the CSA (Canadian
Standards Association) website @ http://www.csa.ca or by
calling 1-800-463-6727.
f. Plugged 1/8” N.P.T. Test Gage Connection is located on the
Heater Gas Valve or a ¼” N.P.T. Connection is located on the
outside of the Cast Venturi.
g. Contact the factory when appliance is to be installed at high
altitudes. Factory supplies high-altitude conversion kits with
instructions and data plates.
For additional information, contact;
MR. HEATER CORPORATION
CUSTOMER SERVICE DEPT.
CLEVELAND, OHIO
1-800-251-0001
*The following extra NFPA manuals are helpful when installing
MR. 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 ½ PSI INLET PRESSURE TO HEATER
2. CLEARANCES
Minimum clearances to combustibles (Refer to Table 3). Provide
adequate clearance to combustibles, see Table 3. Also between
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 ANSI/NFPA No. 409 most recent edition, or Table
3; the larger dimension of ANSI/NFPA No. 409 or Table 3 is to be
used.
*When selecting installation locations for MR. HEATER ensure that
the opening of any exterior or interior doors or windows will not
violate clearances or contact any heater components.
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/HS40NG 40,000 — 6.8” W.C. — 7” W.C. — 5.8” — 37 —
MH/HS40LP — 40,000 — 11” W.C. — 14” W.C. — 10” — 50
Table 2. Heater Dimensions and Orice Sizes
MODEL OPERATING ORIFICE SIZE INPUT SIZE
NO. PRESSURE BURNER PILOT BTU/H WIDTH LENGTH HEIGHT WEIGHT
MH/HS40NG 6.8”w.c. 37 .023 40.000 19-1/4” 30-1/4” 12” 25 lbs.
MH/HS40LP 10”w.c. 50 .015 40,000 19-1/4” 30-1/4” 12” 25 lbs.
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/HS40NG 40,000 — HORIZ-30˚ 34” 30” 30” 68”
MH/HS40LP — 40,000 HORIZ-30˚ 34” 30” 30” 68”
The clearances to combustibles represent a surface temperature
of 90°F (32°C) above room temperature. Building materials with
low heat tolerance may be subject to degradation at lower
temperatures. It is the installer’s responsibility.
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