Aerco KC Series Installation, Operation & Maintenance Instructions Manual page 11

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
purposes. 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.
2.5 ELECTRIC SUPPLY
AERCO Gas Fired Equipment Electrical Power
Wiring Guide (GF-1060) must be consulted in
addition to the following material before wiring to
the unit is started. The location of the electrical
wiring box is on the front right side of the unit as
shown in Figure 2.7.
INSTALLATION PROCEDURES
ELECTRICAL WIRING BOX
FRAME
SSOV
ACTUATOR
Figure 2.7
AC Wiring Box Location
All electrical conduit and hardware should
be installed so that it does interfere with the
removal of any cover, inhibit service or
maintenance, or prevent access between
the unit and walls or another unit.
2.5.1 ELECTRICAL REQUIREMENTS
Electrical requirements for each unit are 120
VAC, 1 Phase, 60 Hz, 20 Amps from a
dedicated electrical circuit. No other devices
should be on the same electrical circuit as a KC
unit. A disconnecting means such as a service
switch must be installed near the unit for normal
operation and maintenance. All electrical
connections should be made in accordance with
the National Electrical Code and/or with any
applicable local codes.
The electrical wiring diagram is shown in Figure
2.8. Conduit should be run from the knockouts
provided in the side of the electrical box in such
a manner that it does not interfere with the
removal of any sheet metal covers. A flexible
electrical connection may be utilized to allow the
covers to be removed easily.
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BLOWER
NOTE: