Indeeco 961 Series User manual

REV. LEVEL ECO 1-7305 07/2017 FORM 9763
961 SERIES
CONFINED SPACE
UNIT HEATER
Horizontal or Vertical Mounting
ATTENTION: Read carefully before attempting to install or
operate Unit Heater.
FEATURES:
• Forced air electric unit heater available in:
240/208 volt single phase, 5 kw and
240 and 480 three phase 5 kw.
• 240/208 single phase unit is factory wired
for 5 kw. The wattage may be changed by
moving jumpers as indicated in table 1.
• 24 volt control standard on three phase unit.
• All units with “T” sufx provided with unit
mounted hydraulic thermostat.
• Mounting bracket included with all units.
PROPER MOUNTING:
The heater(s) should be located along outside
walls or other areas of greatest heat loss.
Multiple heaters should be spaced to set up a
generally circular air movement, each heater
supporting the air stream of the other.
EXPOSED
EXPOSED
H
H
H
H
H
EXPOSED
EXPOSED
IMPORTANT: OWNER SHOULD RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE

REV. LEVEL ECO 1-7305 07/2017 FORM 9763
PRINCIPLES OF OPERATION
When the thermostat calls for heat, the elements
are immediately energized, a fan delay brings on
the fan after the elements are heated allowing
warm air to circulate. When the thermostat is
satised, the elements are de-energized and the
fan purges the heater of residual heat.
The heater wattage may be eld adjusted only on
model 961-U5000V-T. Select the desired wattage
from Fig.1 and move color coded jumpers as
indicated.
Fig.1
INSTALLATION INSTRUCTIONS
All electric unit heaters are shipped fully
assembled. Installation includes hanging the
unit and electrical wiring to the unit.
The wall and/or ceiling structure must be
sufcient to support the combined weight of the
heater and any mounting bracket and
accessories.
Be sure power source is de-energized before
installing heater. Check heater voltage and
phase listed on heater data label on back of unit
to make sure they are the same as the electrical
service supplied.
MOUNTING THE HEATER
Select the mounting location. Be sure to observe
the minimum mounting clearances as shown in
Figure 2.
The heater can be mounted either from the
ceiling or wall depending on the application.
The mounting bracket is supplied with 3/8” holes,
10 inches on center for threaded rod mounting or
direct mounting to the structure.
The heater cabinet also has 3/8” weld nuts 10” on
center to allow threaded rod mounting without the
bracket.
1. Install the mounting bracket in the desired
location with threaded rod or hardware
that is appropriate for the mounting surface.
If using threaded rod, two nuts, one on the top
and one on the bottom of the bracket along
with a split washer is suggested.
2. Secure the heater to mounting bracket, using
the 1/4-20 x 3/4” machine screws and
lockwashers provided.
3. Position the heater, aligning the bracket holes
with the cabinet holes and secure bracket to
the cabinet with the 1/4-20 x 1/2” machine
screws and nuts that are provided. With the
mounting bracket in the vertical position the
1/4” nuts are not necessary, weld nuts are
supplied in the cabinet.
USE COPPER
CONDUCTORS
ONLY
16
36
14
10
CAUTION: USE SUPPLY WIRES SUITABLE FOR
AT LEAST 90°C (194°F)
ATTENTION: UTILISEZ DES FILS
D'APPROVISIONNEMENT APRÈS AU MOINS 90 ° C
(194 ° F)
AWG
12
24
AMPS
12
8
WATTAGE ADJUSTMENT TABLE
B
BLACK
BLUE AND YELLOW TO TERMINAL 'C'3333/2500
240/208V 1
PH
ELEMENT
USE COPPER CONDUCTORS ONLY
240/208
M
BLUE JUMPER TO TERMINAL 'C'
A
RED
4167/3120
LIMIT
VOLTS
240/208
240/208
BLACK
NONE REQUIRED5000/3750
WATTS
CONTROL
FAN DELAY
NEC CLASS 1 RATED 600V
ADJUSTMENT
RED
BLUE,YELLOW AND RED TO TERMINAL 'C'
C
2500/1875
THERMOSTAT
CONTROL CIRCUIT WIRING MUST BE
240/208
LTB
L1 L2
961-U5000V-T
USE WITH MODEL NUMBER

REV. LEVEL ECO 1-7305 07/2017 FORM 9763
Fig. 2
POWER CONNECTION
To avoid possible electrical shock, be sure the electrical current is turned off at
the main switch prior to wiring or servicing of unit.
1. Remove the access panel, by removing four screws, two on the front and two on the back.
2. Remove desired knockout on side or back of the heater.
3. Following the correct unit wiring diagram, connect the power supply and electrical ground to the
correct terminals using accepted practices recognized by local codes. See Table 1 for minimum
circuit requirements.
4. Replace the access panel, tighten the screws to ensure a good seal to help prevent dust and dirt
from entering the control compartment.

REV. LEVEL ECO 1-7305 07/2017 FORM 9763
Note: Supply wire must be 90°C AWG minimum.
OPERATION
1. Restore power to the unit.
2. Turn the thermostat up to energize the unit. When the area reaches the desired temperature, rotate
the thermostat knob counter- clockwise slowly until the heat turns off.
3. This 961 series is provided with a fan delay/purge. When the heater is turned on, the elements will
heat up before the fan comes on (approx. 30 seconds). This allows for warm air circulation. When
the thermostat is satised, the elements will de-energize and the fan will continue to run
(approx. 30 seconds) allowing residual heat to be purged from the heater.
4. The 961 abnormal situation such as fan failure or other over-temp. situations the limit control
will cycle the heater off. In the event of an over-temp situation, the heater should be inspected to
determine the cause and repaired by authorized personnel.
GENERAL SAFETY INFORMATION:
CAUTION:
Follow all local electrical and safety codes, as well as the National Electric Code (NEC) and the Occu-
pational Safety and Health Act (OSHA).
To avoid possible electrical shock, be sure the electrical current is turned off at the main switch prior
to wiring or servicing of unit.
If the power disconnect is not integral and is out-of-sight, lock it in the open position and tag to pre-
vent unexpected application of power prior to performing any service of maintenance on the unit.
The unit when installed must be electrically grounded in accordance with the National Electrical Code
and standard industry practice.
Make certain that the power source conforms to the requirements of your equipment. See Table 1 for
information as to wire and circuit size.
Check heater voltage and phase on rating label to conrm it is the same as the electric service
supply.
Wiring diagrams of the heaters and supply connections are permanently attached to the heater
access door. All terminals are coded in accordance with the wiring diagram.
The wall/ceiling mounting structure and anchoring provisions must be of sufcient strength to support
the combined weight of the heater and mounting bracket.

REV. LEVEL ECO 1-7305 07/2017 FORM 9763
MAINTENANCE:
Caution: Make certain that the power source is disconnected before attempting to service or disas-
semble any component. If the power disconnect is out of the line of sight, lock it in the OPEN position
and tag to prevent the application of power.
Electrical:
Once a year inspect the control panel wiring to make certain insulation is intact and all connections
both factory and eld are tight. Inspect all heater and relay contacts. If the contacts appear badly pit-
ted or burned, replace the contactor/relay.
Cleaning:
Clean the unit casing, fan and motor once a year. A dirty motor will tend to run hot and eventually will
be damaged internally. Any rust spots on the casing should be cleaned and repainted.
The element can be cleaned by removing the outer cabinet. Do not use any liquid to clean electric
components.
Lubrication:
All units have fan motors that are permanently lubricated. No oiling is required.
425 Hanley Industrial Court * St. Louis, Missouri 63144
[phone] * FAX [phone]
www.indeeco.com * [email protected]
WIRING DIAGRAMS
961-U5000U-T
961-U5000KU-T