User Manual

5
Installation
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 qualied personnel
with electrical heating equipment experience.
Install and use the heater in accordance with local codes
and this manual.
1. General
1.1 Use only approved copper conductors for
installation. Refer to Section G. Technical Data, page
12 and heater data plate for heater rating.
1.2 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 B.3.7, page5). Connection box volume:
2 to 10kW: 9,893 cm³, 15 to 30 kW: 32,333 cm³.
2. Field Wiring
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 to 10 kW units.
Two 1/2", 3/4", 1" or 1-1/4" conduit knockouts are located on
the 15 to 30 kW units.
3. 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 7. Sample Wiring Schematics - RGE Series Heater,
page 5 – 7. Remote thermostats are available from
the factory. Any thermostat used with this heater must be:
3.1 UL listed or CSA approved
3.2 Rated for 240 volts minimum and 5 amps minimum.
4. Grounding: a copper compression terminal is located
beside the terminal block. Ensure the unit is properly
grounded before energizing.
5. 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3E, page 7. The limit switch is rated 600 volts, 10
amps resistive.
6. Final Inspection
Before application of electrical power:
6.1 Check that all connections are secured and comply
with the applicable code requirements.
6.2 Conrm supply voltage is compatible with the data
plate specications.
6.3 Remove any foreign objects from the heater.
6.4 Ensure all external ttings and enclosure covers are
secured.
6.5 Ensure fan rotates freely.
6.6 If equipped, ensure manual reset thermal cut‑out
has been reset.
7. Sample Wiring Schematics - RGE Series Heater
If the wiring schematics of Figures 3A – 3G, page5 –7,
do not match your conguration, check the inside
access panel of the unit for specic wiring schematic.
Alternatively, all wiring schematics are available online at:
www.thermon.com.
B.4 Sample Wiring Schematics RGE Series Heaters
Figure 3A – RGE Series 2 – 10 kW wiring schematic with hi-limit option. 208V and 240V models.