SECTION 2: INSTALLATION
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2.12 Combustion Air
Air supply is a direct requirement of ANSI 223.1, NFPA-54, and local codes. These codes should be
consulted before a permanent design is determined.
The combustion air must be free of chlorine, halogenated hydrocarbons, and other chemicals that can
become hazardous when used in gas-fired equipment. Common sources of these compounds are
swimming pools, degreasing compounds, plastic processing, and refrigerants. Whenever the environment
contains these types of chemicals, combustion air MUST be supplied from a clean area outdoors for the
protection and longevity of the equipment and warranty validation.
If combustion air is not supplied through air ducts, it must be supplied to the unit(s) through two
permanent openings. These two openings must have a free area of
not less than one square inch (6.5
cm
2
) for each 4000 BTUs (1.17 kW) input
for
each unit
. The free area must take into account restrictions
such as louvers and bird screens.
2.12.1 Ducted Combustion Air
For ducted combustion air installations, the air ductwork must be attached directly to the air inlet
connection on the sheet metal enclosure. Consult the
CFR Venting and Combustion Air Guide
, TAG-0105
when designing combustion air ducting.
When using the unit in a ducted combustion air configuration, the minimum diameter connection at the
unit is
8-inches
.
2.13 CFR Pump Relay
The CFR power panel includes a pump relay terminal block providing 120VAC with a maximum pilot duty
of 3 amps. If the pump power requirement under all conditions is greater than 3 amps, use this relay to
activate the pump through an intermediate relay with a higher power.
Figure 2-16: Pump Relay Terminal Block (in Red Rectangle)
The Pump Delay Timer feature allows pump to run for up to 30 minutes after the boiler has shut down
and the demand is satisfied. To enable, go to
Advanced Setup
→
Ancillary Devices
→
Relays
and set the
Pump Off Delay
setting to the desired delays time
.
Summary of Contents for AERCO CFR 3000
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