17
PART 3 GAS CONNECTION
Verify that the appliance is supplied with the type of gas
specified on the rating plate. Consult factory for installations at
high altitude.
3.1
GAS CONNECTION
•
Safe operation of unit requires properly sized gas supply
piping. See gas line sizing data.
•
Gas pipe size may be larger than appliance connection.
•
Installation of a union at the appliance gas line connection
is required for ease of service and removal of the gas train.
•
Install a manual main gas shutoff valve, outside of the
appliance gas connection as require by local codes.
•
A trap (drip leg) MUST be provided in the inlet gas
connection to the appliance.
•
Optional gas controls may require routing of bleeds and
vents to the atmosphere, outside the building when required
by local codes.
•
Larger models of this appliance may be supplied with a gas
pressure relief valve. This valve is designed to relieve
lockup pressure in excess of the high gas pressure switch
setting. It must be piped to discharge excess gas pressure
through the valve to a safe location in accordance with local
codes. Follow table 5 for sizing the vent line.
Table 5: Gas Pressure Relief Valve – Vent Manifold
Sizing Chart
Size of Combined Vent Line (Sch. 40
pipe)*
Qty. of Pressure
Relief Valves being
combined
Pressure Relief
Valve Size - 3/4"
NPT
Pressure Relief
Valve Size - 1" NPT
1
3/4"
1"
2
1"
1 1/4"
3
1 1/4"
1 1/2"
4
1 1/4"
2"
5
1 1/2"
2"
6
1 1/2"
2"
7
2"
2 1/2"
8
2"
2 1/2"
* Up to 50 feet. Increase by one pipe size for every 50 feet or
part thereof that the vent line extends beyond the initial 50 feet.
The increase is to be made at the connection to the relief valve.
Table 6: Recommended Gas Pipe Size
Single Appliance Installation
(For distance from natural gas meter or propane second stage
regulator)
Input
0-100 FT
101-200 FT
201-300 FT
Btu/Hr,
x1000 NAT.
L.P.
NAT.
L.P.
NAT.
L.P.
300
1 ¼“
1“
1 ½”
1 ¼“
1 ½“
1 ¼“
350
1 ¼“
1“
1 ½”
1 ¼“
1 ½“
1 ¼“
400
1 ¼“
1“
1 ½“
1 ¼“
2“
1 ½“
500
1 ½“
1 ¼“
2“
1 ½“
2“
1 ½“
600
1 ½“
1 ¼“
2“
1 ½“
2“
1 ½“
800
2 “
1 ½“
2“
1 ½“
2 ½”
2”
1000
2 “
1 ½“
2“
1 ½“
2 ½”
2”
1200
2”
1 ½“
2 ½”
2”
2 ½”
2”
1400
2 ½”
2”
2 ½”
2”
3”
2 ½”
1600
2 ½”
2”
3”
2 ½”
3”
2 ½”
1800
2 ½”
2”
3”
2 ½”
3”
2 ½”
2000
2 ½”
2”
3”
2 ½”
3”
2 ½”
2500
3”
2 ½”
3”
2 ½”
3 1/2”
3”
3000
3”
2 ½”
3”
2 ½”
3 1/2”
3”
3500
3”
2 ½”
3 ½”
3”
4”
3 ½”
4000
3 ½”
3”
4”
3 ½”
4”
3 ½”
4500
3 ½”
3”
4”
3 ½”
4”
3 ½”
5000
4”
3 ½”
4”
3 ½”
5”
4”
3.2
GAS PIPING
All gas connections must be made with pipe joint compound
resistant to the action of liquefied petroleum and natural gas. All
piping must comply with local codes and ordinances.
3.3
INSTALL PIPING
•
The gas line should be sufficient to handle the total installed
capacity. Verify pipe size with gas supplier.
•
Use new, properly threaded black iron pipe free from burrs.
Avoid flexible gas connections. Internal diameter of flexible
gas lines may not provide appliance with proper volume of
gas.
•
Install a manual main gas shutoff valve at the appliance gas
inlet, outside of the appliance and before the gas valve.
Install a joint union at the appliance gas line connection for
ease of service and removal of the gas train.
•
Run gas pipe to appliance gas inlet.
•
Install a sediment trap in the supply line to the appliance
gas inlet.
•
Apply a moderate amount of good quality pipe compound.
•
For LP gas, consult your LP gas supplier for expert
installation.
The appliance and its individual gas shut-off valve must be
disconnected from the supply piping when pressure testing the
gas supply piping at pressures above ½ PSI
Table 7: Gas Pressures at Inlet to Appliance
PROPANE
NATURAL GAS
Minimum (inches W.C.)
11
4.5*
Maximum (inches W.C.)
11
14
* 7” w.c. recommended regulator setting
The gas supply line must be of adequate size to prevent undue
pressure drop and must never be smaller than the size of the
connection on the appliance. Sizing based on Table 6 is
recommended.
Before operating the appliance, the complete gas train and all
connections must be tested using soap solution.
Verify that the appliance is supplied with the type of gas
specified on the rating plate. Heating values of local natural gas
are to be between 950 and 1010 Btu/ft
3
. Consult factory if
heating values are outside this range or if a gas with a mixture
of constituents is being used.
Summary of Contents for DRW1000
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Page 67: ...67 PART 12 EXPLODED VIEW 19 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20...
Page 68: ...68 21 22 23 24 26 35 34 33 32 31 30 29 28 27 25 36 37 38 39 40 42 43 56...
Page 75: ...75 PART 13 ELECTRICAL DIAGRAMS...
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