Roberts Gorden NDUSTRIA NHE Series, Installation, Operation & Service Manual

Page: 60 / 78

NHE-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
56
SECTION 10: WIRING
Heaters can be controlled using several methods.
Normally thermostats are used to control the heaters
but they can also be controlled by an Energy
Management System. Section 10.1 below illustrates
the connection for heaters controlled by a line voltage
thermostat. NOTE: In order to use line voltage ther
-
mostats, the low voltage terminal located at the back
of each burner must be connected as shown in the
detail. For a single heater on a low voltage thermo
-
stat, See Section 10.2 below. To control multiple
heaters on one low voltage thermostat, See Page 57,
Section 10.3 . NOTE: In order to control multiple heat -
ers on one low voltage thermostat, the low voltage
terminals on each heater must be connected as
shown in detail. Heater must be grounded in accor
-
dance with applicable codes:
United States:
refer to
National Electrical Code
®
NFPA 70 - latest revision
Canada: refer to Canadian Electrical Code, CSA
C22.1 Part I - latest revision.If any of the original
internal wiring must be replaced, it must be replaced
with wiring materials having a temperature rating of at
least 105° C and 600 V.
10.1 Line Voltage Thermostat Wiring
10.2 Low Voltage Thermostat with One Burner
DANGER
Electrical Shock Hazard
Disconnect electric before service.
Heater must be properly earthed.
Failure to follow these instructions can result
in death or electrical shock.
Line Voltage
Thermostat
Gnd. Gnd.
120 V-60 Hz
Supply Circuit
H N H N
Gnd.
L1
L2
T
Low voltage black jumper
wire connected inside all
burners between Purple and
Blue wire; Yellow not used.
Gnd.
120 V-60 Hz
Supply Circuit
H N
Gnd.
L1
L2
NOTE: Yellow and Purple wires provide 24 VAC to power thermostat
Low voltage terminal detail:
Thermostat: R to Purple wire;
W to Blue wire; C to Yellow wire