Electrical Service Guide; Section 4 − Operation; Controls - Miller Electric Intellifire 250 Owner's Manual

3-6. Electrical Service Guide

Input Voltage
Input Amperes At Rated Output
Max Recommended Standard Fuse Rating In Amperes
Min Input Conductor Size In AWG
Max Recommended Input Conductor Length In Feet (Meters)
Min Grounding Conductor Size In AWG
Reference: 2005 National Electrical Code (NEC) (including article 630)
1 Consult factory for circuit breaker applications.
2 "Time-Delay" fuses are UL class "RK5" .
3 "Normal Operating" (general purpose - no intentional delay) fuses are UL class "K5" (up to and including 60 amp), and UL class "H" ( 65 amp and
above).
4 Conductor data in this section specifies conductor size (excluding flexible cord or cable) between the panelboard and the equipment per NEC Table
310.16. If a flexible cord or cable is used, minimum conductor size may increase. See NEC Table 400.5(A) for flexible cord and cable requirements.

4-1. Controls

1 Power Adjust Control
Use control to select power between the mini-
mum and maximum output of the power
source. The numbers around the control are in
kilowatts (kW).
2 Remote Power Control Switch
Use switch to select way of controlling unit out-
put.
For front panel control, place switch in Panel
position.
OM-184 227 Page 10
1
2
Time-Delay
3
Normal Operating
4
4
SECTION 4 − OPERATION
1
4
For remote control, place switch in Remote 14
position. Connect controller or pendant control
to Remote 14 receptacle (see Section 3-3).
The remote control functions as a slave to the
front panel Power Adjust control. For example,
if the front panel control is set to 12.5 kW and
the remote control is set to maximum, output
will be 12.5 kW. To obtain maximum output
from the unit using a remote control, the front
panel control must be set to maximum.
60 Hz Three Phase
460
39
45
60
8
287
(87)
10
3
2
3 Power Switch With Indicator Light
Use switch to turn unit, fan motor, and indica-
tor light On and Off.
Unit is ready to heat 10 seconds after Power
switch is placed in On position.
4 Ground Fault Test Switch
Use switch to test ground fault circuitry.
Ref. ST-801 826-C