Installation / Operation Instruction Manual

Page 30
B RADFORD W HITE
SECTION 4
GAS SUPPLY AND PIPING
All Installations must conform to the National Fuel
Gas Code ANSI Z223.1/NFPA54, and/or local codes.
In Canada, the installation must conform to the latest
edition of CSA B149.1 Natural Gas and Propane Gas
Installation Code, and/or local codes. Gas piping should
be supported by suitable hangers or oor stands, not
the appliance.
Review the following instructions before proceeding
with the installation.
1. Verify that the appliance is tted for the proper type of
gas by checking the rating plate. The unit will function
properly without the use of high altitude modication
at elevations up to 10,000 feet (3050 m).
2. The maximum inlet gas pressure must not
exceed 13” W.C. (3.2kPa). The minimum inlet gas
pressure is 4” W.C. (1.0kPa).
3. Refer to Table 8 to size the piping.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shuto󰀨 valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of the
gas controls.
7. All threaded joints should be coated with
piping compound resistant to action of liqueed
petroleum gas.
8. The appliance and its individual shuto󰀨 valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG (3.45kPa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shuto󰀨
valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 1/2 PSIG (3.45kPa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines.
WARNING:
Open ame can cause gas to ignite and result in
property damage, severe injury, or loss of life.
NATURAL GAS
REQUIRED
SIZE
CU FT
/
HR.
150 150
199/210 199/210
285 285
399 399
500 500
600 600
750 750
850 850
Table 8. To Size Your Piping
TO SIZE PIPING:
Measure linear distance from meter outlet to last
boiler. Add total input of all boilers and divide
by 1000 to obtain cu ft / hr required. Add total
equivalent length of ttings used according to
Table 9. Align total length (pipe and ttings) on left
side column of Table 10 with highest cubic feet of
gas required.
Notes:
Consult and conrm with Applicable Fuel Gas
Code before beginning work. Verify gas inlet
pressure is between 4 and 13 in W.C. before
starting boiler.
NOTE: This appliance and all other gas appliances
sharing the gas supply line must be ring at maximum
capacity to properly measure the inlet supply pressure.
The pressure can be measured at the supply pressure
port on the gas valve. Low gas pressure could be an
indication of an undersized gas meter, undersized
gas supply lines and/or an obstructed gas supply
line. Some units are equipped with low and high gas
pressure switches that are integrally vent limited.
These types of devices do not require venting to
atmosphere.