Technical information

WIRING
Note: All electrical wiring must be done according to National Electrical
and local codes by a qualified person.
ELECTRIC SHOCK HAZARD. Any installation involving electric heaters
must be performed by a qualified person and must be effectively
grounded in accordance with the National Electrical Code to eliminate
shock hazard.
1. Connect heater according to the voltage and frequency specified
on the nameplate.
2. All units are provided with control and power terminal blocks for
customer’s connection.
3. Protection against overheating is provided by an internal automat-
ic 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 obstruc-
tion. If optional manual reset is tripped, determine cause before re-
energizing.
The system designer is responsible for the safety of this equipment
and should install adequate back-up controls and safety devices
with their electric heating equipment. Where the consequences of
failure could result in personal injury or property damage, back-up
controls are essential.
4. 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 residual heat.
Standard Equipment
• Built-in Thermostat (bulb and capillary type) for automatic
temperature control. The thermostat controls the heating elements and
fan simultaneously to achieve set temperature.
The Lo setting of the thermostat is approximately 40˚F and
the Hi setting is approximately 90˚F.
• Heat-Cool switch (heater on, heater off, fan only) to permit
air flow with or without energizing the heating elements. The switch is
accessible from outside the NEMA 4X enclosure.
• A pilot light to indicate when heating elements are energized.
Optional Equipment
• Internal fusing
• Manual reset cutout
• Disconnect switch
• For wiring diagram containing options, see label on inside cover
of terminal box
4
WARNING
!
WARNING
!
WIRING DIAGRAMS
Figure 8 2, 3kw 208-277V 1Ø
THRU BULKHEAD
FITTING
T3
120V 1 PHASE
T3T3
M
TERMINAL
BLOCK
HEATER
THRU
BULKHEAD
LOCATED IN HEATER
TERMINAL
BLOCK
(CONTROL)
L1L1
L1
L1
L1
C1
C1
C2
AUTOMATIC
OVERHEAT
CUTOUT
Figure 7 2, 3kw 120V 1Ø
C2
C1
(CONTROL)
TERMINAL BLOCK
SEC
PRIMARY
TRANSFORMER 40VA
POWER
CONTACTOR
X1
X2
H1
H2
T1 T2
AR CUTOUT
T2T1 T2T1
1PH ELEMENT WIRING
L1 L2
BLK
BRN
BLK
FOR VOLTAGE
SEE HEATER
M
T1
T2
RED
IN HEATER
BUILT IN THERMOSTAT
24V