Titus Electric Heat IOM - Manual (Page 2)

Data Label
All electric coils are provided with a product label affixed to the control enclosure cover. This label contains all
necessary information regarding electrical power and circuit protection requirements, as specified by UL. See Figure 1.
Figure 1.
Heater Control Enclosure
Figure 2 shows the interior of a typical electric coil control enclosure. Various components contained within this
enclosure are necessary for the safe operation of the product. An interlocking safety door disconnect switch is
recommended, but not required. It prevents access to the enclosure until all ungrounded conductors are disconnected
from the electric coil circuit. If an optional disconnect switch is not ordered, a terminal block will be provided for single
point electrical hook-up. A ground lug is provided to insure proper grounding of the terminal unit housing and
enclosure. Optional line fuses and fan motor fuses provide overcurrent protection, if permitted by local building
codes. An air flow switch is always provided to lock-out the coil when there is no air flow across the elements. An
automatic reset thermal cut-out is required to de-energize elements whenever discharge temperature is excessive.
The coil will resume operation when discharge temperatures decrease. An optional manual reset thermal cut-out will
protect the elements in the event of a thermal cut-out failure and prevent the coil from operating until qualified service
personnel can make repairs. Fuse links are required on all single duct electric coils to provide safety in event of a
thermal cut-out failure. Fuse links must be replaced as they cannot be reset. A control transformer is provided
whenever a 24 V circuit is required. PE switches may be load bearing on small pneumatically-controlled electric coils,
or pilot duty when current loads require magnetic contactors. Optional mercury contactors are available for extra
long service life and / or silent operation. In addition to these components, fan powered terminals may include an SCR
motor speed control and a fan relay.
Fan Interlock Relay
Ground Lug
Door Interlock
Disconnect Switch
(Optional)
NEMA 1 Casing, Heavy
Gauge Corrosion
Resistant Steel
Control Circuit
Terminal Block Control Transformer
Differential Pressure
Air Flow Switch
Heating Elements
Staggered for Uniform
Heat Transfer
Automatic Reset
Thermal Cutout
Hinged Access Door
Latched by Optional
Interlock Disconnect Switch
Heating Element Terminal Box
Recessed into Air Stream for
Accurate Temperature Sensing by
Thermal Cutouts
Magnetic Contactors
for Primary Control
Line Fuse Block and
Fuses (3 Phase
Shown)
EHeat-IOM-2.0 6-1-01
MODEL NO DTQS CODE 99-361901-B 6 REV:
MOTOR VOLT 277 PHASE 1 HZ 60
HP 1/6 FLA(EA) 1.40
HEAT VOLT 277 PHASE 1 HZ 60
KW 6.0 AMPS 21.66
MOTOR(S) ARE THERMALLY PROTECTED MAXIMUM OVERCURRENT
MIN. SUPPLY CIRCUIT AMPS 1.38 AMP PROTECTION = 15 AMP
XXXXXXXXXXXXXXXXXXXXXXXXXXX
MAX. OUTLET AIR TEMPERATURE 200
O F
UNIT DESIGNED TO OPERATE AT NO LESS THAN 0.2 IWG STATIC PRESSURE
TO COMBUSTIBLE MATERIAL.
FAN UNIT
ZERO CLEARANCE FROM UNIT, CONNECTED DUCT AND/OR PLENUM
Figure 2.