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Installation, Operation, Maintenance and Parts Manual
DR Series Heaters
3.1 GAS SUPPLY
CAUTION!
CORRECT INLET PRESSURES ARE VITAL FOR
EFFICIENT OPERATION OF HEATER. REFER TO
AGA/CGA RATING PLATE AND, IF NECESSARY,
CONSULT GAS COMPANY.
If all or a portion of the gas supply line consists of used
pipe, it must be cleaned and then inspected to determine
its equivalency to new pipe. Test all main supply lines
according to local codes. (Isolate heater gas valve and
supplied gas cock during test.)
Excessive torque on the manifold may misalign the
orifice(s). Always use two wrenches when tightening
mating pipe connections.
WARNING!
Never use a match or any other flame to test for
gas leaks. Use a soap and water solution to check
for leaks.
If any portion of the gas supply line is located in an area
that could cause an abnormal amount of condensate to
occur in the pipe, a sediment trap should be installed.
NOTE: For high pressure gas above 14 in. W.C.P.
(Water Column), a high pressure regulator and gas cock
must be used. If compressed air is used to detect leaks
in the gas supply line, disconnect and cap shutoff cock
to avoid damage to regulator and gas valve.
A sediment trap in the gas line will decrease the
possibility of any loose scale or dirt in the supply line
entering the heater's control system and causing a
malfunction. Provide a 1/8 in. (3.2mm) NPT, plugged
tapping accessible for test gauge connection
immediately up stream of gas connection to heater.
Consult gas company for the proper pipe sizing. The
gas supply line must be of sufficient size to provide the
required capacity and inlet pressure to the heater (see
figure 3.1).
NOTE: Manifold pressure should be checked at the tap
on the gas valve. Readings will be above atmospheric
pressure (during operation).
MANIFOLD PRESSURE CHART
Required
Manifold
Pressure (WCP)
Natural Gas
6.0 in.
Liquified
10.0 in.
Petroleum Gas
Use only a pipe joint compound that is resistant to liquified
petroleum gases.
The following guidelines must be observed to ensure
proper system performance and safety:
Gas Line Connection
•
The use of a stainless steel, flexible gas connector
is recommended. If, however, local codes require
rigid piping to the heater, a swing joint can be used.
•
The gas outlet shall be in the same room as the
appliance and the connector must not be concealed
within or run through any wall, floor or partition.
•
The connector shall be of adequate length.
•
The final assembly shall be tested for leaks.
CAUTION: Matches, candles, open flame or other
sources of ignition shall not be used for this purpose.
Leak test solutions may cause corrosion-water rinse
after test.
•
Contact with foreign objects or substances should
be avoided.
•
The connector should not be kinked, twisted or
torqued.
•
Connectors are for use only on piping systems
having fuel gas pressures not in excess of ½ pound
per square inch or 14.0 in. W.C.P.
•
Neither the gas pipe nor flexible gas connector shall
be placed in the 'flue discharge area'. See Fig. 2.1.
•
Bending, flexing and vibration to the gas connections
must be avoided to prevent failure.
CONNECTOR NUTS MUST NOT BE CONNECTED
DIRECTLY TO PIPE THREADS. THIS CONNECTOR
MUST BE INSTALLED WITH ADAPTORS PROVIDED.
DO NOT REUSE.
7
DR Series
Minimum
Maximum
Inlet Pressure
Inlet Pressure
(WCP)
7.0 in.
11.0 in.
Figure 3.1
CAUTION!
(WCP)
14.0 in.
14.0 in.
å å å å å
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