Suspension; Gas Supply; Piping Requirements; Gas Pressure - Mr. Heater MH40NG Operating Instructions And Owner's Manual

3. 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.

4. 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 natural gas with pressure drop of 0.3 inches, specific
gravity of 0.60. For liquefied Petroleum Gas (LP) capacity refer
to Figures 3. 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,
disconnect each heater to prevent control damage and cap
outlets. After reconnecting all heaters, purge gas lines of air
and check all connections for leaks using soap solution. Liquid
dishwashing detergent is an excellent leak detector.

5. PIPING REQUIREMENTS

All piping installed must comply with local codes and ordinances
or with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54),
whichever takes precedence. When installing piping, the following
requirements must be taken into consideration:
• Use new properly reamed black pipe free from chips.
• Apply a good quality pipe compound to all male threads prior
to assembly. If L.P. gas is the fuel, ensure that pipe compound
is resistant to L.P. gas. Do NoT USe TeFLoN ™ tape.
• Prior to installation, apply pipe compound to all male threads
as shown in Figure 1.
USE MODERATE AMOUNT OF PIPE DOPE
LeAVe FIRST 2 THReADS BARe
Figure 1. Pipe Compound Application
• Male threads on pipe to be installed into gas valve shall meet
the requirements of Figure 2. Threads longer than those
shown in the figure may cause gas valve distortion and mal-
function.
• A sediment trap meeting the typical requirements of Figure 3
shall be installed in the line to the gas valve.
• A dedicated shutoff valve for the heater must be installed in
¾" MAXIMUM THReAD LeNGTH
½" BLACK PIPe
GAS VALVe BoDY
½" MAXIMUM DePTH oF INSeRTS
INTo GAS VALVe
Figure 2.
Gas valve
connection
requirements
E4
Model # MH40NG/LP
the gas supply line.
NOTE:
1. only Use A Pipe Compound Which Is Resistant To Liquefied
Gases on L.P. Installations.
2. Fittings Shown Are Not Included With Heater.
Sediment trap
Figure 3. Typical Piping Installation

6. GAS PRESSURE

When a higher than the maximum recommended gas pressure is
being maintained at the main gas line, a separate regulator must
be installed ahead of the heater. Refer to Table 1 on page 3 for
maximum allowable pressure for stated heater model and gas.
See heater rating plate for minimum gas supply pressure "For the
Purpose of Input Adjustment."
on a multiple heater installation in may be possible to use one
large capacity regulator or an individual regulator for each heater.
Nevertheless, it is recommended practice to make the entire pipe
system a loop.
Contact your local representative or the factory for proper gas
pressure reducing design stage.

7. ELECTRICAL

NeVeR CoNNeCT PoWeRPILe GAS VALVe oR THeRMoSTAT To
LINe VoLTAGe oR A TRANSFoRMeR.
8. THERMOSTAT & LOCATION
Make sure that the electrical characteristics of the thermostat
match those of the heater controls. For best results thermostat
should be positioned 5 ft. above floor where air can circulate
freely around it. DO NOT MOUNT directly to cold-side wall, in
direct drafts, or directly beneath the infra-red heater.
ensure that the selected thermostat location meets all of the
above requirements. Refer to the instructions that come with
the thermostat for additional general information and mounting
instructions.
If the wall is of stud and wallboard construction, then use the #6
by 1 inch sheet metal screws, included with the thermostat, and
mount the thermostat in the selected location.
If wall is brick or masonry, the appropriate anchors must be
obtained to accommodate the thermostat mounting screws. Use
the back plate of the thermostat as a template to mark the hole
location, drill appropriate size anchor holes, install the anchors and
securely attach the thermostat using the mounting screws.
Installation Instructions and owner's Manual