THERMOSTAT
POWERPILE GAS VALVE
POWERPILE GENERATOR
Figure 4. Connection Diagram
Refer to National Electrical Code
3. CONNECTING HEATER TO GAS SUPPLY
WARNING: Depending on local codes and require- ments and the installer’s skill level, the sizing and installation of gas lines required to safely and efficiently supply the heater may require the assistance of a pro- fessional. If in doubt as to these requirements, discuss the requirements of this manual with the dealer from whom the heater was purchased and your gas supplier.
3.1Gas Supply Requirements
•See Tables 1 and 2 for gas supply minimum, maxi- mum, operating, and manifold pressures for both heater models. Pressures are provided in inches of W.C. (water column). Also, see heater rating plates located on the heater.
WARNING: Model MH/HS25NG is designed to burn natural gas and it comes equipped with a regulator. The regulator is built into the gas valve. The maximum inlet pressure to this regulator is 1/2 psi (14 in. W.C.) If gas line pressure exceeds 1/2 psi, then an additional regulator must be installed before the heater/regulator to step down the pressure to a maximum of 1/2 psi.
•Most residential natural gas services provide a line pressure of 4 oz. (6.9 in. W.C.). If in doubt consult your natural gas supplier.
•To ensure the best performance from your natural gas heater make sure the supply manifold pres- sure is at least 6” W.C.
WARNING: Model MH/HS25LP is designed to burn liq- uefied petroleum (LP) gas and it comes equipped with a regulator. The regulator is built into the gas valve. The maximum inlet pressure to this regulator is 1/2 psi (14 in. W.C.). If gas line pressure exceeds 1/2 psi, then an additional regulator must be installed before the heater/ regulator to step down the pressure to a maximum of 1/2 psi.
•To ensure the best performance from your LP gas
heater, make sure the supply manifold pres- sure is at least 1/2 psi (14 in W.P.).
3.2 Piping Requirements
All piping installed must comply with local codes and ordinances or with National Fuel Gas Code,
ANSI Z223.1 (NFPA 54), whichever takes precedence. When installing piping, the following requirements must be taken into consideration: Canadian installa- tions must comply with the B149.1.2 Gas Code.
•Use new properly reamed black pipe free from chips.
•Apply a good quality pipe compound to all male threads as shown in Figure 5 prior to as- sembly. If LP gas is the fuel, ensure that pipe compound is resistant to LP gas. Do not use Teflon™ tape.
USE MODERATE AMOUNT OF PIPE DOPE
LEAVE 2 THREADS BARE
Figure 5. Pipe Compound Application
•Male threads on pipe to be installed into gas valve shall meet the requirements of Figure 6. Threads longer than those shown in the figure may cause gas valve distortion and malfunc- tion.
•A sediment trap meeting the typical require- ments of Figure 7 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.
3.3Piping Installation
While ensuring that all of the above gas supply re-
3/4” MAXIMUM THREAD LENGTH
1/2” BLACK PIPE
GAS VALVE BODY
1/2” MAXIMUM
DEPTH OF IN- SERTS INTO GAS VALVE
Figure 6. Gas Valve Connection Requirements
Model # MH25NG/LP | HS25NG/LP | E8 | Installation instructions and Owner’s Manual |
