The Model CK Series is a special application heater that is approved for use in
concealed areas of a building. This
heater may be installed in areas that are
not readily available for a person to see,
such as the area between a concrete
ceiling and a drop-tile ceiling, in plenum
open or ducted system and can be used
for constant environmental temperature
control and freeze protection for sprinkler systems in concealed areas.
The unit can be mounted vertically or horizontally.
It is also suitable for use as a special purpose unit heater where the environmental requirements are
dirty, dusty, moist or mildly corrosive.
CK heater installed inside a plenum area
for inline ducted air and heat boost in large
commercial HVAC systems can be mounted
in vertical or horizontal ducting.
Access opening must be
provided to the heater.
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Outside Wall
Large building ventilation system air
heater for pre heat or stand alone
heating system.
King Electrical Mfg. Co. 9131 10th Ave South, Seattle WA 98108 ph: 206-762-0400 fax: 206-763-7738
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MODEL CK PLENUM INSTALLATION INSTRUCTIONS
TESTED AND APPROVED BY ETL TESTING LABORATORIES No 500505
CAUTION: Turn off power source for the heater before attempting installation, maintenance or
repairs. Lock, tape or tag circuit breaker or fuse so that power cannot be turned on by accident.
Failure to do so could result in personal injury or shock.
INSPECT HEATER: Remove heater from carton and check to be sure blower wheel is free-turning,
and that element assemblies are in place. Be sure filter is in proper position and not torn or damaged.
Control Wiring: Connect thermostat to terminals R
and W for heating, and to R and G for cool air only.
This can be done with a single stage heat-cool thermostat or a single stage heat only thermostat and a
separate fan only switch to control the fan-relay (optional). Some models have two stage operation (optional) and are provided with terminals W1 and W2.
If a single stage thermostat is used it should be connected to terminals R and W1 and a jumper wire
installed from terminals W1 to W2; see enclosed
control circuit wiring diagram.
The model CK Air Heater plenum installation is a special application heater for use in the space
created between a finished concrete ceiling and a drop type t-bar ceiling, an area normally hidden
from view.
The heater is mounted horizontally with the integral suspension bracket provided in an area where
service access can be readily maintained.
Safety screens are provided at both the air intake and discharge aperture. Fixed air directional louvers
are standard.
A 24 volt control thermostat with a maximum temperature setting of 100º F will prevent operation of
the unit should the ambient rise above 100º F. - the maximum ambient for which the heater is intended
to operate.
King Electrical Mfg. Co. 9131 10th Ave South, Seattle WA 98108 ph: 206-762-0400 fax: 206-763-7738
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MOUNTING: When the model CK unit is to be used in a return air plenum, the heater is to be
mounted, as shown, in a vertical space of not less than 24” allowing for at least 1½” of clearance along
the uppermost portion of the heater and a minimum of 2½“ along the bottom of the heater. ½” diameter mounting holes are provided as shown in dimensional diagram. Do not store combustible materials in the immediate area in which the heater is desired to operate.
2 HOUR RATED CONCRETE CEILING
OPEN SPACE ABOVE CEILING
USED FOR AIR PLENUM
EXHAUST
DROP TYPE T-BAR CEILING
ARMSTRONG OR CELOTEX 2’ X 4’ LAY IN TILE CEILING OR EQUAL
CLASS A NON-COMBUSTIBLE 0-25 FLAME SPREAD
Maintenance & Warranty
Top View
The high quality and superior design of this unit
will enable years of maintenance free performance.
The filter should be replaced at a minimum of once
a year depending upon the environment the heater
is located in, some environments may require 2 to
3 times a year.
The CK Plenum heater carries a 5 year extended
Side View
warranty for the heating elements only. All other
components are covered for one year. The warranty requires that the owner, or his agent, install
the equipment in accordance with the National
Electrical Code, any other applicable heating or
Dimension:
20”H x 16”W x 33½”D
electrical codes, and the manufacturer’s installation instructions.
King Electrical Mfg. Co. 9131 10th Ave South, Seattle WA 98108 ph: 206-762-0400 fax: 206-763-7738