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Installation – Desa BG30PT User Manual

Page 12

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114683-01B

12

CONNECTING TO GAS SUPPLY

WARNING: This appliance

requires a 3/8" NPT (National

Pipe Thread) inlet connection to

the pressure regulator.

WARNING: A qualified ser-

vice person must connect heater

to gas supply. Follow all local

codes.

WARNING: For natural gas,

never connect heater to private (non-

utility) gas wells. This gas is com-

monly known as wellhead gas.

IMPORTANT:

For natural gas, check gas line

pressure before connecting heater to gas line. Gas

line pressure must be no greater than 10.5 inches of

water. If gas line pressure is higher, heater regula-

tor damage could occur.

CAUTION: For propane/LP

gas, never connect heater directly

to the propane/LP supply. This

heater requires an external regu-

lator (not supplied). Install the

external regulator between the

heater and propane/LP supply.

For propane/LP gas, the installer must supply an

external regulator. The external regulator will

reduce incoming gas pressure. You must reduce

incoming gas pressure to between 11 and 14 inches

of water. If you do not reduce incoming gas pres-

sure, heater regulator damage could occur. Install

the external regulator with the vent pointing down

as shown in Figure 14. Pointing the vent down

protects it from freezing rain or sleet.

INSTALLATION

Continued

Figure 14 - External Regulator With Vent

Pointing Down

External Regulator

Propane/LP
Supply Tank

Vent
Pointing
Down

CAUTION: Use only new,

black iron or steel pipe. Inter-

nally-tinned copper tubing may

be used in certain areas. Check

your local codes. Use pipe of

large enough diameter to allow

proper gas volume to heater. If

pipe is too small, undue loss of

volume will occur.

Typical Inlet Pipe Diameter

30,000 Btu/Hr Models - 1/2" or greater

Installation must include equipment shutoff valve,

union and plugged 1/8" NPT tap. Locate NPT tap

within reach for test gauge hook up. NPT tap must

be upstream from heater (see Figure 15, page 13).
IMPORTANT:

Install an equipment shutoff valve

in an accessible location. The equipment shutoff

valve is for turning on or shutting off the gas to

the appliance.
Apply pipe joint sealant lightly to male NPT

threads. This will prevent excess sealant from

going into pipe. Excess sealant in pipe could result

in clogged heater valves.

WARNING: Use pipe joint

sealant that is resistant to liquid

petroleum (LP) gas.

Install sediment trap in supply line as shown in

Figure 15, page 13. Locate sediment trap where

it is within reach for cleaning. Locate sediment

trap where trapped matter is not likely to freeze.

A sediment trap traps moisture and contaminants.

This keeps them from going into heater controls. If

sediment trap is not installed or is installed wrong,

heater may not run properly.

This manual is related to the following products: