9
The rating plate is stamped with the model number, type of gas
and gas input rating. Make sure the unit is equipped to operate on
the type of gas available. The gas line installation must comply
with local codes, or in the absence of local codes, with the latest
edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
Natural Gas Connection
1/2
3/4
1
1 1/4 1 1 /2
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
Pressure= .50 PSIG or less and Pressure Drop of 0.3" W.C.
(Based on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
Length of
Pipe in Feet
Heating Value of Gas (BTU/Cubic Foot
CFH =
BTUH Furnace Input
1. Refer to the Proper Piping Practice drawing for the general
layout at the unit. The following rules apply:
2.
Use black iron pipe and fittings for the supply piping. The
use of a flex connector and/or copper piping is permitted as
long as it is in agreement with local codes.
3. Use pipe joint compound on male threads only. Pipe joint
compound must be resistant to the action of the fuel used.
4. Use ground joint unions.
5. Install a drip leg to trap dirt and moisture before it can enter
the gas valve. The drip leg must be a minimum of three
inches long.
6. Use two pipe wrenches when making connection to the gas
valve to keep it from turning.
7.
Install a manual shut-off valve in a convenient location
(within six feet of unit) between the meter and the unit.
8. Tighten all joints securely.
9. The unit must be connected to the building piping by one of
the following methods:
•
Rigid metallic pipe and fittings
•
Semirigid metallic tubing and metallic fittings (Aluminum
alloy tubing must not be used in exterior locations)
•
Listed gas appliance connectors used in accordance with
the terms of their listing that are completely in the same
room as the equipment
•
In the prior two methods above the connector or tubing
must be protected from physical and thermal damage.
Aluminum alloy tubing and connectors must be coated to
protect against external corrosion when in contact with
masonry, plaster or insulation or are subject to repeated
wettings by liquids (water - not rain water, detergents or
sewage)
Proper Piping Practice
NOTE:
The unit gas supply entrance is factory sealed with plugs.
Keep plugs in place until gas supply is ready to be installed. Once
ready, replace the plugs with the supplied grommets and install
gas supply line.
Gas Piping Checks
WARNING
To prevent property damage or personal injury
due to fire, the following instructions must
be performed regarding gas connections and
pressure testing:
•
The unit and its gas connections must be
leak tested before fire, never use a match or
open flame to test for leaks. Never exceed
specified pressures for testing. Higher
pressure may damage gas valve and cause
overfiring which may result in premature
heat exchanger failure.
•
This unit and its shut-off valve must be
disconnected from the gas supply during any
pressure testing of that system at pressures
in excess of 1/2 PSIG (3.48 kPA).
•
This unit must be isolated from the gas
supply system by closing its manual shut-off
valve during any pressure testing of the gas
supply piping system at test pressures equal
to or less than 1/2 PSIG (3.48 kPA).
WARNING
To avoid property damage or personal injury, be
sure there is no open flame in the vicinity during
air bleeding.
There will be air in the gas supply line after testing for leaks on a
new installation. Therefore, the air must be bled from the line by
loosening the ground joint union until pure gas is expelled. Tighten
union and wait for five minutes until all gas has been dissipated in
the air. Be certain there is no open flame in the vicinity during air
bleeding procedure. The unit is placed in operation by closing the
main electrical disconnect switch for the unit.
Summary of Contents for DP14U Series
Page 23: ...23 APPENDIX Unit Dimensions...
