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Installation
instructions
3.5
Gas piping & connections
/_1
Before
connecting
the gas supply,
check
the rating
plate on the right side of the heater to be sure that the
heater is rated for the same
gas to which
it will be
connected.
In the United States: The installation
must conform
with
local
codes
or, in the absence
of local
codes,
the
National
Fuel Gas Code ANSI Z223.1/NFPA
54.
In Canada:
The Installation
should
conform
to CGA
B1 49 INSTALLATION
CODES
and/or local installation
codes.
Note:
The
125
BO
comes
with
a gas
pressure
regulator
installed.
Disconnecting
or altering
the gas
pressure
regulator
will
be
a
violation
of
CSA
certification
of the unit. The regulator
supplied
with the
heater is preset for the gas shown on the rating plate to
the correct
pressure.
It is an appliance
level regulator
designed
for (low inlet) pressure
(less than 1/2 Psig or
14" W.C,).
GAS CONNECTIONS
• Install a manual gas shut off valve, on the gas supply
line.
• Install a union when connecting
gas supply.
• The minimum
diameter
required
for any appliance
connector
used is 3/4".
•
National
Fuel Gas Code
requires
that a sediment
trap (drip leg) be installed on gas appliances
not so
equipped.
The drip leg must be accessible
and not
subject
to freezing
conditions.
Install in accordance
with
the
recommendations
of
the
serving
gas
supplier.
When connections
are made, check for gas leaks at all
joints. Apply some gas leak detection
solution to all gas
fittings. Bubbles are a sign of a leak. A combustible
gas
detector
may also be used to detect for leaks.
HIGH ALTITUDE
INSTALLATION
The pressure
regulator
provided
with
the heater
is
adjusted
to
deliver
the
proper
gas
pressure
(as
indicated
on the rating
plate
and in the manual
for
altitude up to 2000 feet (660 meters) above sea level.
On appliances
being
installed
above
2000
ft (660
meters) elevation,
the inlet gas pressure
should
be set
at installation
to the value shown below.
Note:
The
gas pressures
specified
below
refer
to
pressures
taken at the pressure tap on the gas inlet pipe
just above the regulator.
See chapter
3.6 for measuring
gas pressure.
MAXIMUM
INLET GAS FLOW
PRESSURE
SETTING
0'- 2 000 ft
5.7"
10.5"
2 000 ft- 4 500 ft
4.6"
8.4"
Table 3 Above 4.500 ft consult your local gas provider
GAS LINE SIZING
The gas supply piping should be sized according
to the
applicable
code for a maximum draw of 11 7,000 BTUH.
Measure the length of gas supply line and use the tables
in Fig. 9 or the gas line manufacturer's
sizing tables to
determine
the
pipe
diameter
necessary
to
accommodate
the BTU demand
of the unit. If there are
more gas drawing
appliances
on the line, size the gas
line according
to the total maximum
amount
of BTU
draw for all appliances.
Note: Under sizing the gas line may result in diminished
output and improper
operation.
See chapter
3.6 for the
procedure
to confirm
gas pressure.
10
8716473147
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