HTP PHE199-119 - Manual (Page 47)

47
LP-314 REV. 3.24.14
It is of extreme importance that this unit be properly grounded. Prior to making any electrical connections, It is very important that the
building system ground is inspected by a qualified electrician. Make certain that electrical power is only turned on when the unit is
completely filled with cold water.
PART 8 - GAS CONNECTION
Failure to follow all precautions in this section could result in fire, explosion, or death!
A. GAS SUPPLY
The gas supply shall have a maximum inlet pressure of less than 14” water
column (350 mm), ½ pound pressure (3.5 kP
a), and a minimum of 3.5”
water column (WC). As stated in the National Fuel Gas Code, the entire
piping system, gas meter, and regulator must be sized properly to prevent
pressure drop greater than .5” WC. This information is listed on the unit
rating plate.
It is very important that you are connected to the type of gas noted on the
rating plate: “LP” for liquefied petroleum, propane gas, or “Nat” for natural or
city gas. Prior to turning the gas supply on, all gas connections must be
approved by the local gas supplier or utility in addition to the governing
authority. Do not remove the reducing coupling attached to the gas
valve! Per the National Fuel Gas Code, it is mandatory that this fitting
be used for connection to a field fabricated drip leg as shown in the
illustration at left.
Ensure that the entire gas line to the connection at the appliance is no
smaller than ¾”. Once all inspections have been performed, the piping must
be leak tested. If the leak test requirement is a higher test pressure than the
maximum gas inlet pressure, you must isolate the appliance from the gas
line to continue leak testing. In order to do this, you must turn off the factory
and field-installed gas cocks. This will minimize the possibility of damaging
the appliance gas valve.
Failure to isolate gas line while leak testing may damage the gas valve. In the event the gas valve is exposed to a pressure greater than
½ psi, 14” water column, the gas valve must be replaced. Never use an open flame (match, lighter, etc.) to check gas connections.
B. GAS PIPING
1. Run the gas supply line in accordance with all applicable codes.
2. Locate and install manual shutoff valves in accordance with state and local requirements.
C. GAS TABLE
Refer to the following table to size the supply piping to minimize pressure drop between meter or regulator and unit.
Maximum capacity of pipe in cubic feet of gas per hour for gas pressures of .5 psi or less and a pressure drop of .3” water column:
Table 9
Figure 27