Suspension.2; Gas Supply.2 - Mr. Heater MH40 NG Installation And Operating Instructions Manual

DO NOT EXCEED 1/2 PSI INLET PRESSURE TO HEATER.
3. 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. 88
most recent edition, or Table 3; whichever is larger.
A minimum clearance of 10' from the bottom of heater to top of wing, or engine enclosure, where
aircraft are housed, and 8' above floor in other areas of the hangar 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.
TABLE 3. INSTALLATION, VENTILATION AND MOUNTING INFORMATION
MODEL
NO.
BTU/HR. RATING
GAS
NORMAL
MOUNTING
POSITION
CLEARANCES TO COMBUSTIBLE S LIRFACES
NATURAL PROPANE
TOP SIDES
BACK BELOW
MH40NG
MH40LP
40,000
40,000
HORIZ-300
HORIZ-300
mm
30"
30"
30"
30"
68"
68"
* 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.
4. SUSPENSION
Heater has four mounting holes, two on each end, for attaching rod, chain, or angle iron brackets and
shall be safely and adequately fixed in position independent of gas and electric supply lines. Refer to
Figures 11
& 12 for recommended suspensions.
5. GAS SUPPLY
Provide adequate gas supply for rated input of each heater using American Standard Installation of
gas piping and gas appliances in building. ANSI Z223.1a/NFPA 54 pamphlet, Table C-3 shows
capacity of pipe of different diameters and lengths in cubic feet per hour for natural gas with pressure
drop of 0.3 inches, specific gravity of 0.60. For liquified Petroleum Gas (LP) capacity refer to Table
C-3 and C-15 of the same pamphlet. For recommended heater gas connection refer to Figures 3 &
10. On threaded pipes use a pipe compound which is resistant to the action of all gases.
If gas lines are to be pressure tested with compressed air, disccnnect each heater to prevent control
damage and cap outlets. After reconnecting all heaters, purge gas lines of air and check all connec¬
tions for leaks using soap solution. Liquid dishwashing detergent is an excellent leak detector.
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