AERCO CFR1500 Electrical Power Design CFR Boilers User Guide
- June 1, 2024
- AERCO
Table of Contents
Electrical Power Design Guide
Other documents for this product include:
TAG-0105 CFR Boiler Vent & Combustion Air Guide
TAG-0106 CFR Boiler Gas Guide
TAG-0107 CFR Boiler Application Guide
Disclaimer
The information contained in this manual is subject to change without notice
from AECO International, Inc. AECO makes no warranty of any kind with respect
to this material, including, but not limited to, implied warranties of
merchantability and fitness for a particular application. AERCO International
is not liable for errors appearing in this manual, not for incidental or
consequential damages occurring in connection with the furnishing,
performance, or use of these materials.
GENERAL
CFR Boilers are fully factory wired packaged units which require simple
external power wiring as part of the installation (Figure 1). This technical
guide is intended to help in the design of electrical power wiring (line
voltage) to CFR units. Control wiring details are provided in other
publications, depending upon unit application.
This document is intended only as a guide and therefore cannot include all
possible alternatives or unit applications. In order to comply with all codes
and authorities having jurisdiction, designers and installers must plan the
electrical wiring carefully and execute the installation completely.
Emergency shutoffs, fusible fire switches, break glass stations, and other
electrical requirements should be considered and installed whenever necessary.
BOILER ELECTRICAL REQUIREMENTS
CFR boilers are available with the following power options:
| Model | Voltage | Phase | Amperage |
|---|---|---|---|
| CFR1500 | 120 V | 1∅/ 60 Hz | 20 |
| CFR3000 | 208 V | 3∅ / 60 Hz | 20 |
| 480 V | 3∅ / 60 Hz | 15 |
Voltages lower than those specified in the table above will result in
increased wear and premature failure of the blower motor. Wire size and type
should be made per the National Electrical Code based on length and load.
For all CFR models, the power box for field wiring connections is located in
the upper right corner behind the unit front panel. All copper wire must be
connected to the power box. 
PROVISIONS FOR SERVICE
Designers must provide emergency shutoffs and other devices to satisfy
electrical codes. It is also recommended to provide an electrical shutoff
disconnect switch of suitable load carrying characteristics near each CFR
boiler.
No electrical boxes or field components should be mounted to the surface of
the boiler or where they would interfere with the removal of the side or top
panels for maintenance.
The service disconnect switch should be mounted near the unit. Wiring conduit,
EMT, or other wiring paths should not be secured to the unit but supported
externally. Electricians should be instructed as to where the wiring conduit
should be located, such as away from the relief valve discharge, drains, etc.
All electrical conduit and hardware should be installed so that it does not
interfere with the removal of any covers, inhibit service or maintenance, or
prevent access between the unit and walls or another unit.
BOILER WIRING
A dedicated protected circuit should be provided from the power source to the
boiler. No other electrical devices should be permanently wired on the same
circuit. The protected circuit and circuit breaker switch must be sized for
the amperage values below.
An emergency switch (electrical shutoff) must be wired in series with power to
the unit. Connecting an emergency shutoff switch (E-stop) to the main power
terminals of the boiler is the recommended and safest way to totally disable
and un-power the unit. Use of the remote interlock, located on the I/O board,
is not recommended since it does not cutoff power within the unit, it only
disables it. Under no circumstance should the remote interlock of the BST
Manager unit be used as an emergency switch for the plant. 
The following table lists the input power requirements for all CFR boilers, including the diagram number of each model’s corresponding schematic diagram:
CFR POWER REQUIREMENTS| |
---|---|---
Model| Diag.| Voltage/Phase/Frequency| Amps| Wires
CFR1500| la| 120V/1ø / 60 Hz@| 20 A| 3
CFR3000| 2| 208V/3ø/60 Hz| 20 A| 5
3a| 480V/ 3ø/ 60 Hz| 15A| 4
For applicable wiring connections, refer to the schematic diagrams below.
MULTIPLE UNIT WIRING
Whenever multiple units are installed within the same mechanical spaces, electrical code requirements call for a single electrical shutoff for emergency use. It is the responsibility of the electrical engineer or designer to comply with all local codes and regulations regarding installation.
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