Combustion Air; Ducted Combustion Air; Cfr Pump Relay - Watts AERCO CFR 3000 Installation And Start-Up Manual

Cfr boilers with edge@ controller

Hide thumbs Also See for AERCO CFR 3000:

Table of Contents

SECTION 2: INSTALLATION

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

) 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.

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.

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

Pump Off Delay setting to the desired delays time.

•

Advanced Setup → Ancillary Devices → Relays

•

and set the

Table of Contents