GBT A2-035, Инструкция по установке и эксплуатации

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mounted in the lower half of the storage tank. Boiler temperature controls are typically mounted in the primary
loop. If the temperature control sensor is mounted directly on the heater/boiler water piping, the sensor must be
installed on the inlet water piping to prevent short cycling of the appliance.
A water flow switch must be installed by the installer and wired to prevent the unit from firing if for any reason
there is an inadequate flow of water through the boiler/heater (see wiring diagrams for suggested location in the
electrical circuit).
NOTE: CSD-1 model boilers only, are equipped with a factory installed operating
aquastat.
Optional, circulation pumps can be supplied for single or three phase and 115 to 460 volts as required. The
pump power must be wired independently and should be adequate for the amp rating of the pump motor. Refer
to the Operating Instructions and Wiring Diagrams sections of this manual for more information regarding
pumps.
GAS REQUIREMENTS
Ensure the fuel the appliance will burn is the same as that specified on the boiler
rating plate. Conversions must be completed by a Qualified Service Agency or Gas
Provider. Call your Green Boiler Technologies Representative or Customer Service
for instructions and the proper conversion kit.
The gas supply meter, regulator, and piping must have sufficient capacity to supply all gas fired appliances they
feed without undue pressure loss. If the gas meter, regulator or piping is too small, request the gas company
install equipment with adequate capacity.
The allowable pressure loss in gas piping between the gas meter or service regulator and each appliance is
generally between 0.3 to 0.5 inches of water column. Refer to the National Fuel Gas Code, ANSI Z223.1, Latest
Edition, for sizing guidelines.
Example: For 20 equivalent feet of 1-1/2 inch piping, the maximum cuft/hr gas flow with a 0.3 inch w.c.
pressure loss is 726. For natural gas at 1025 Btu/cuft, the maximum firing rate is 744,000 Btu/hr
[726 x1025]. For propane at 2500 Btu/cuft, the maximum firing rate is 1,815,000 Btu/hr [726 x
2500].
Maximum and minimum gas pressure delivered to the boiler/heater is shown below. If the gas supply line
pressure is greater than the maximum listed, a pressure regulator must be installed at least 10 pipe diameters
upstream of the boiler/heater.
Max Length
(Equivalent feet)
3/4 1 1-1/4 1-1/2 2 2-1/2 3 4
10 273 514 1060 1580 3050 4860 8580 17500
20 188 353 726 1090 2090 3340 5900 12000
30 151 284 583 873 1680 2680 4740 9660
40 129 243 499 747 1440 2290 4050 8270
50 114 215 442 662 1280 2030 3590 7330
60 104 195 400 600 1160 1840 3260 6640
70 95 179 368 552 1060 1690 3000 6110
80 89 167 343 514 989 1580 2790 5680
90 83 157 322 482 928 1480 2610 5330
100 79 148 304 455 877 1400 2470 5040
125 70 131 269 403 777 1240 2190 4460
150 63 119 244 366 704 1120 1980 4050
175 58 109 224 336 648 1030 1820 3720
200 54 102 209 313 602 960 1700 3460
Gas Pipe Sizing Chart: Cubic Feet of Gas Per Hour
Size Schedule 40 Metal l ic Pipe (i nches)
Ta bl e Va l ue s For Na tura l Ga s , Spe ci fi c Gra vi ty 0.60
Typical Natural Gas = 1025 Btu per cuft ; Typi cal Propane = 2,500 btu/cuft