Electric CK Plenum Heater
Plenum Heater
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.
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.
Access opening must be
provided to the heater.
OPTIONS
2-Stage Control for Single or Three Phase Models
Modulating Thermostat for SSR Control
In-Built Thermostat - N.E.M.A. 4X
Duct Sensor for Modulating Thermostat
Motor Substitution To Increase Or Decrease CFM, Standard ¼ and ½ HP
Disconnect Switches - 30 through 100 Amp, 3-Pole
Solid State Relays - 25, 45 and 75 Amp
Duct Sensor for Modulating Thermostat
Outside Wall
Large building ventilation system
air heater for preheat or stand
alone heating system.
No Diffuser For In-Line Duct Installation
2007 CK.indd : 12/07
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
2007 CK.indd : 12/07
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