Advertisement
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. Heaters are not provided with a control switch and may be con-
trolled by a wall-mounted thermostat.
3. All units are provided with control and power terminal blocks for
customer's connection.
4. 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
Figure 7 HD3D-200 and HD3D 300 120V 1Ø
XFMR COLOR
CODE TABULATION
PRI.
VOLT.
208
BLK
240
277
Figure 8 HD3D-200 and HD3D 280-277V 1Ø
WIRING DIAGRAMS
REMOVE JUMPER WHEN THERMOSTAT IS USED
HEATER
M
L1
L1
L1
L1
L1
TERMINAL
BLOCK
120V 1 PHASE
1PH ELEMENT WIRING
T1
T1
X2
POWER
T1
T2
YEL
BLU
CONTACTOR
YEL
BLU
L1
BLU
YEL
FOR VOLTAGE
SEE HEATER
WIRING
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.
5. 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.
Optional 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 power is on.
•
Internal fusing
•
Manual reset cutout
•
Disconnect switch
•
For wiring diagram containing options, see label on inside cover
of terminal box
LOCATED IN HEATER
THRU
BULKHEAD
AUTOMATIC
OVERHEAT
CUTOUT
T3
M
T1
T2
T2
T2
BLK
RED
AR CUTOUT
X1
TRANSFORMER 40VA
H1
PRIMARY
4
BUILT IN OR WALL
MOUNTED THERMOSTAT
TERMINAL
BLOCK
C2
C1
(CONTROL)
C1
THRU BULKHEAD
FITTING
BUILT IN OR REMOTE THERMOSTAT
REMOVE JUMPER WHEN
IN HEATER
THERMOSTAT IS USED
TERMINAL BLOCK
C1
C2
BLK
(CONTROL)
X2
REFER TO NAMEPLATE FOR
XFMR PRIMARY (INPUT) AND
SECONDARY (CONTROL) VOLTAGE.
H2
Advertisement
