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B.3 Electrical
WARNING
WARNING.
Disconnect heater from power supply at
disconnect or fuse box before opening enclosures or
servicing heater.
Lock the switch in the
“OFF”
(open) position and tag
the switch to prevent unexpected power application.
This heater should only be serviced by qualified
personnel with electrical heating equipment experience.
Install and use the heater in accordance with local
codes and this manual.
B.3.1 General
1.
Use only approved copper conductors for installation. Refer
to Section G. Technical Data, page 13 and heater data
plate for conductor rating.
2.
The power supply may be single or three phase as shown
on the nameplate. Wiring diagrams are on the inside of the
terminal compartment cover (or refer to Section B.4 Sample
Wiring Schematics - RGE Series Heater, page 5 – 7).
Connection box volume: 2 – 10 kW: 9893 cm³, 15 – 40 kW:
32333 cm³.
B.3.2 Field Wiring
1.
Heater is supplied with an enclosure that has standard trade
size conduit openings to accommodate the line conductors
or external thermostat connection. Two 1/2" or 3/4" conduit
knockouts are located on the 2 – 10 kW units. Two 1/2", 3/4",
1" or 1-1/4" conduit knockouts are located on the 15 – 40 kW
units.
2.
Heater may be supplied with a factory-installed built-in
room thermostat. On heaters not supplied with this option,
a remote thermostat is required. Connect the remote
thermostat conductors to the terminal block, refer to Section
B.4 Sample Wiring Schematics - RGE Series Heater, page
5 – 7. Remote thermostats are available from the
factory. Any thermostat used with this heater must be:
2.1
UL listed or CSA approved
2.2
Rated for 240 volts minimum and 5 amps minimum.
3.
Grounding: a ground screw with a cup washer is located
beside the terminal block. Ensure the unit is properly
grounded before energizing.
4.
Models without a built-in contactor should have the limit switch
wired in the control circuit of an external contactor, and for three
phase supply, this control circuit should be connected to L2 and
L3 which feed the centre heating element, refer to Figure 2E,
page 7. The limit switch is rated 600 volts, 10 amps resistive.
B.3.3 Final Inspection
Before application of electrical power:
4.1
Check that all connections are secured and comply
with the applicable code requirements.
4.2
Confirm supply voltage is compatible with the data
plate specifications.
4.3
Remove any foreign objects from the heater.
4.4
Ensure all external fittings and enclosure covers are
secured.
4.5
Ensure fan rotates freely.
4.6
If equipped, ensure manual reset thermal cut-out has
been reset.
B.4 Sample Wiring Schematics - RGE Series Heater
If the wiring schematics of Figures 2A – 2F, page 5 – 7,
do not match your configuration, check the inside access
panel of the unit for specific wiring schematic. Alternatively, all
wiring schematics are available online at: www.ruffneck.com.
Figure 2A – RGE Series 2 – 10 kW wiring schematic with hi-limit option. 208 V and 240 V models.
