Wiring - Chromalox HD3D Installation, Operation And Maintenance Instructions

Wiring Instructions
Note: All electrical wiring must be done according to
National Electrical and local codes by a qualified per-
son.
ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed
by a qualified person and must be effective-
ly grounded in accordance with the National
Electrical Code to eliminate shock hazard.
The system designer is responsible for the
safety of this equipment and should install ad-
equate back-up controls and safety devices
with their electric heating equipment. Where
the consequences of failure could result in per-
sonal injury or property damage, back-up con-
trols are essential.
Control Panel Layout
J
A
B
I
E
D
1. Check all factory wiring for loose connections. It is
possible for connections to become loose during
shipping.
2. Connect heater according to the voltage and fre-
quency specified on the nameplate.
3. Heaters are not provided with a control switch and
may be controlled by a wall-mounted thermostat.
4. All units are provided with control and power termi-
nal blocks for customer's connection.
5. Protection against overheating is provided by an
internal automatic thermal cutout (manual reset
cutout optional) which opens the electric circuit if
the normal air-flow is restricted or stopped. Cutout
automatically energizes heater on removal of the
obstruction. If optional manual reset is tripped, de-
termine cause before re-energizing.
6. Heaters rated 5kW - 39kW are equipped with fan
delay control.
This control continues fan operation for a short time
after elements are de-energized to dissipate residu-
al heat.
7. Follow wiring diagram label located on door inside
control panel.
Letter
A
B
C
C
D
E
F
F
G
H
I
J
G
The Transformer (J) is located below
the motor contactor (E), therefore it is
H
not seen in photo.
7
Description
Thermostat
Power Contactor
Fan Relay
Terminal Block
Motor Contactor
Grounding Lug
Conduit Opening
Fan Only Switch
Pilot Light
Transformer (Hidden)