AERCO KC Series Equipped with C-More Controller for Massachusetts Only - Manual (Page 15)

INSTALLATION
2-5
Figure 2.6
Gas Supply Regulator and Manual Shut -
Off Valve Location
All pipe should be de-burred and internally
cleared of any scale or iron chips prior to
installation. No flexible connectors or non-
approved gas fittings should be installed. Piping
should be supported from floor or walls only and
must not be secured to the unit.
A suitable piping compound approved for use
with gas should be used sparingly. Any excess
must be wiped off to prevent clogging of
components.
To avoid damage to the unit when pressure
testing gas piping, isolate the unit from the gas
supply piping. At no time should there be more
than 1 psig maximum to the unit. Bubble test all
external piping thoroughly for leaks using a soap
and water solution or suitable equivalent. The
gas piping must meet all applicable codes.
2.4.1 GAS SUPPLY PRESSURE
REGULATOR
A mandatory external, in line, supply gas
regulator ( supplied by others) should be
positioned as shown in Figure 2.6. Union
connections should be placed in the proper
locations to allow maintenance of the regulator if
required.
NOTE:
An individual gas pressure regulator must
be installed upstream of each unit. The
regulator must regulate gas pressure to 8.5”
W.C. for FM gas train and 8.9” W.C. for IRI
gas trains at 1,000,000 BTU/H for natural
gas and propane units.
The maximum static inlet pressure to the unit
must be no more than 14” W.C.. Minimum gas
pressure is 8.5” W.C. for FM gas trains and 8.9”
W.C. IRI gas trains when the unit is firing at
maximum input. Gas pressure should not
exceed 10.5” W.C. at any time when the unit is
firing. Proper sizing of the gas supply regulator in
delivering the correct gas flow and outlet
pressure is mandatory. The gas supply pressure
regulator must maintain the gas pressure at a
minimum of 8.5” W.C. (FM) or 8.9” W.C. (IRI)
when the unit is at maximum BTU input
(1,000,000 BTU/HR). The supply gas regulator
must be able to supply sufficient capacity
volume, (1000 cfh), to the unit and should have
no more than 1" droop from minimum to full fire.
The supply gas regulator must also be rated to
handle the maximum incoming gas pressure.
When the gas supply pressure will not exceed
14” W.C. a non-lock up, or flow through style
regulator, may be used. When supply gas
pressure will exceed 14” W.C., a lock up style
regulator must be used. The gas supply
regulator must be propery vented to outdoors.
Consult the local gas utility for exact
requirements concerning venting of supply gas
regulators.
CAUTION!
A lockup style regulator must be used when
gas supply pressure exceeds 14” W.C.
2.4.2 MANUAL GAS SHUTOFF VALVE
A 1-1/4” manual gas shutoff valve is furnished
with each unit and should be positioned as
shown in Figure 2.6. The valve must be installed
upstream of the gas supply regulator in a readily
accessible location.
2.4.3 IRI GAS TRAIN KIT
The IRI gas train is an optional gas train required
in some areas by code or for insurance pur-
poses. The IRI gas train comes pre-assembled
and wired from the factory. See Appendix E,
Drawing SD-A-606.
The IRI gas train may be ordered pre-assembled
or as separate components. If either IRI gas
train option is ordered, a complete instructional
package, detailing field installation will be
included. To obtain a copy of an IRI instructional
package prior to the equipment shipping contact
your local representative or AERCO.