Beckett CG4 - Manual (Page 9)

9 CG4 Burner Manual
Section: INSPECT/PREPARE INSTALLATION SITE
Fuel Gas Supply
Explosion, Fire,
Asphyxiation Hazard
Leaking gas could result in asphyxiation,
explosion, or fire hazard.
Prior to burner installation all gas supply piping must be
inspected, tested and purged in accordance with the
requirements of the National Fuel Gas Code ANSI Z
223.1 (NFPA 54).
The burner valve must not be exposed to pressure
exceeding 1/2 PSI under any circumstances.
Insure that the supply gas pipe size is capable of
providing at least 4.5” W.C. pressure to the burner gas
train inlet at the burner’s full capacity rating. Refer to
Tables 2 and 3.
Explosion, Fire, and Gas
Leak Hazard
A Drip Leg is required in Gas Supply
Piping. Foreign matter could lodge in gas
valve cutoff seals, resulting in gas leak-
through, explosion or fire.
Insure that a full-size drip leg or dirt pocket has been
installed in the piping directly ahead of the main shutoff
valve to capture foreign matter.
Electrical Supply
Check the nameplate on the burner to verify that the
power connections available are correct for the burner.
Refer to Figure 2 on Page 5. All power must be
supplied through a disconnect switch fused at 20A
maximum and comply with the latest edition of National
Electric Code NFPA 70 (Canada CSA C22.1) and all
other local or applicable codes.
Verify Burner Components
Your CG4 burner is shipped in two boxes. Verify that
you received all the necessary components.
The larger box contains:
○ The burner chassis
○ The literature package, which includes the burner
manual
○ The gas valve
○ A small parts bag, containing a reducing tee, a pipe
plug, a union and a baffle (P/N 5880)
The smaller box contains:
○ The air tube
○ The burner head and its (2) mounting screws
○ A blank air band (only packaged with tubes using the
F3G head)
○ A box containing the manifold assembly, the natural
gas orifices, an O-ring, a packet of O-ring lubricant
and 10 mounting screws.
Verify Burner Selection
If the burner is supplied as an original equipment part
of a boiler or furnace appliance the information in this
section may be disregarded. Instead, use the appliance
manufacturer’s specifications.
Verify that the proper burner chassis and air tube
assembly have been selected.
○ Determine the appliance’s design firing rate from the
appliance rating plate. The appliance rating plate will
probably have an input rating and an output rating.
Table 3 – Gas supply piping capacity, CFH
Schedule 40 metallic pipe with 0.50 psi or less inlet pressure
and 0.30” W.C. pressure drop
Maximum capacity in cubic feet of gas per hour (CFH). Natural
gas with 0.60 specific gravity.
Pipe
Length
(ft.)
Pipe size (inches) IPS
1/2” 3/4” 1” 1-1/4” 1-1/2”
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 890
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
110 34 72 130 275 410
120 31 64 120 250 380
150 28 59 110 225 350
Table 2
Gas Supply Pressure Requirements (Natural or Propane)
Maximum 14” WC (1/2 PSI)
Minimum 4.5” WC
If the gas supply pressure is not correct, it must be
corrected before starting the CG4 installation. Contact
your gas utility or qualified contractor.