CHIEF Caldwell AF12-751, Owner'S Manual

Page: 15 / 40

Page 15 of 40
Bulletin 441G
3. ELECTRICAL INSTALLATION OF THE FAN
A. GENERAL INSTRUCTIONS
The electrical installation must be performed by a certified electrician, in accordance with
the appropriate national and local electrical codes.
(CAUTION: ANY VIOLATION OF ELECTRICAL WIRING CODES COULD
JEOPARDIZE THE CALDWELL STANDARD LIMITED WARRANTY.)
B. ELECTRICAL SERVICE INSTALLATION
Check the type of electrical service and make sure the fan to be wired is manufactured to
operate on the electrical service.
Table 3 on Page 13 titled “Fan Model Specifications”
indicates the electrical service the fan is designed to utilize in the column labeled “Motor
Phase & Voltage”. The electrical service must match this specification. Note that the
Caldwell Three Phase 230V and 460V fans can be wired for either voltage, and if you need
to convert either of these models to the other voltage refer to Page 29 .
The components to connect the electrical service to the fan need to be sized for the
electrical service present.
Tables 5, 6 and 7 located on Page 19 illustrate the sizing
information for Single Phase 230 Volt, Three Phase 230 and 460 Volt, and Three Phase
575 Volt respectively. Use the appropriate table and size the following electrical service
components:
1.) TRANSFORMER
The transformer size for the fan only is indicated in a KVA rating. Example: For an
F18-312 Fan,
Table 5 would be used. The KVA rating for the 3 horsepower motor is
4.5 KVA. This KVA rating is for the fan only. Your electrician will need to add the KVA
requirements for the other electrical components of the system in sizing the
transformer.
2.) FAN DISCONNECT
A disconnect for the fan needs to be sized to handle the recommended cartridge type
fusetron size. Example: For an F18-312 Fan,
Table 5 would be used, and the
fusetron size is 30 amp. Install the fusetron recommended in the disconnect. Note
that a circuit breaker can be used, however, the circuit breaker or any fuse used, must
be a time delay type sized to provide the equivalent current in-rush of the fusetron
fuse to allow the initial starting in-rush current to the fan.
3.) CONDUCTOR SIZE FOR THE FAN DISCONNECT TO FAN WIRING
The conductor size for the fan needs to be sized according to the distance between the
fan and disconnect. Example: For an F18-312 Fan located 200’ from the disconnect,
use
Table 5 to determine the conductor size to be a #6 AWG. The proper sized
wiring must be used to make sure a voltage drop is not developed.