Detroit Radiant Products Company HL3 Series - Manual (Page 7)

7
WARNING
!
HL3 Series 2.0 Installation • Wiring
Electric Shock
Field wiring to the tube heater must be connected and grounded in accordance with national,
state, provincial, local codes and to the guidelines in the Tube Heater General Manual and
Series Insert Manual. In the United States refer to the most current revisions to the ANSI/NFPA
70 Standard and in Canada refer to the most current revisions to the CSA C22.1 Part I Standard.
Wiring
Figure 2.1 • Field Wiring Diagrams
A. Single Heater, No Relay (Single Thermostat).
B. Multiple Heaters with Relay Option (Single Thermostat).
NOTE: If optional yellow
control cord is installed then
the following wire colors apply:
24VAC Out = green
Low = white
High = black
1/4” spade terminals
required (as supplied)
HL3
Burner Box
Thermostat
24VAC
N
Low High
To 120VAC
grounded outlet.
24V
120VAC Power (observe polarity)
NOTE: If optional yellow control cord is
installed then the following wire colors apply:
Neutral = green
Low = white
High = black
1/4” spade terminals
required (as supplied)
HL3
Burner Box
Additional wire needed for thermostats
that require constant power.
24VAC
N
Low High
External Transformer
(field supplied)
Thermostat
To 120VAC grounded outlet.
To 120VAC grounded outlet.
To 120VAC grounded outlet.
N
HL3
Burner Box
HL3
Burner Box
24VAC
120VAC
When using a thermostat that requires constant power a common wire must
be run form the C terminal on the thermostat back to the transformer.