Piping Requirements.3 - Mr. Heater MH40 NG Installation And Operating Instructions Manual

6. PIPING REQUIREMENTS
All piping installed must comply with local codes and ordinances or with the National Fuel Gas Code,
ANSI Z223.1 (NFPA54), whichever takes precedence. When installing piping, the following require¬
ments 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. PQ NQT USE TEFLQN (tm) tap?-
* Prior to installation, apply pipe compound to all male threads
as shown in Figure 1.
USE MODERATE AMOUNT OF PIPE DOPE
LEAVE 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 malfunction.
* A sediment trap meeting the typical requirements of Figure 10 shall be installed in the line to
the gas valve.
* A dedicated shutoff valve for the heater must be installed in the gas supply line.
3/4" MAXIMUM
THREAD LENGTH
1/2" BLACK PIPE
1
1 (11
GAS VALVE BODY
-
1/2" MAXIMUM
DEPTH OF INSERTS- ■ *
INTO GAS VALVE
FIGURE 2. GAS VALVE CONNECTION REQUIREMENTS
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