OHP Installation Manual

14
OHP Series
2.0 Installation • Gas Supply • Gas Connection
When connecting gas piping to the unit, the use of a thread joint compound is required. The thread compound
(pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical constituents of
the gas to be conducted through the piping. Use of Teflon® tape is not permitted.
Install a ground joint union with a brass seat and a manual shut-off valve adjacent to the unit for emergency
shut-off and easy servicing of the controls. A 1/8” NPT plugged tap that is accessible for a test gauge
connection is also recommended as illustrated in Figures 2.4 and 2.5.
A sediment trap must be installed in the supply line in the lowest spot prior to connecting to the heater. The
trap length shall be at least three inches long. Ideally, the trap will be installed as close as possible to the
shut-off.
Chart 2.2
• Gas Consumption and Manifold Pressure (Inches W.C.)
To connect the gas:
Pressure Equivalents: 1 inch W.C. equals .058 oz./sq. in. equals 2.49 Mbar.
Model No. Input
Manifold
Pressure
Minimum
Inlet
Pressure
Maximum
Inlet
Pressure
Gas
Consumption
(CFH)
Gallons per
Hour
Orifice
Size
OHP 31S 48
31,000 6.0” W.C. 7.0 ” W.C. 14.0” W.C. 29.5 0.43 2.35 mm
OHP 31S 98
31,000 10.0” W.C. 11.0 ” W.C. 14.0” W.C. 12.4 0.34 1.65 mm
OHP 34S 48
34,000 6.0” W.C. 7.0 ” W.C. 14.0” W.C. 32.4 0.47 41 DMS
WARNING
!
!
Improperly connected gas lines may result in serious injury or death, explosion, poisonous
fumes, toxic gases, and asphyxiation. Connect gas lines in accordance to national, state,
provincial, and local codes.
WARNING
!
!
Conditions such as wind drafts or other variables can cause movement of the heater and
may require it to be rigidly mounted. Avoid excessive movement and/or vibration of the
gas connection by rigidly mounting the heater.