Qmark CP - Electric Infrared Heating Control Panels User Manual

Page 3

TIME DELAY CONTROLLER

The single contactor panel with a suffix CT in its Model Number
(i.e. CP404802CT) is provided with a time delay timer which
energizes a specific load in an area for intermittent periods of
time. It comes with a momentary push-button switch which acti-
vates the heating load for a preset cycle (adjustable between 1
and 30 minutes). The system is de-energized once the timer has
cycled. Once the cycle has started any push of the button will no
longer affect the timing. The cycle has to finish, the system has
to come off, and only then can the system restart for another
cycle with the push of the button. Since the option to connect a
remote controller is always available, the use of such a remote
controller will override the intermittent cycling of the system. The
system will come ON and OFF instantaneously with the remote
thermostat or controller. The system will stay energized for as
long as the remote controller keeps calling for heat. Only when
the remote thermostat is not calling for heat (R & W open) can
intermittent cycling start. Thus, if only intermittent heating is
desired, the panel will function without the need for a remote
controller. The terminal R and W in the panel must be kept open.
This is ideal for bus stops, loading docks, smoking areas or
remote work stations. A remote controller would be used to
maintain a certain area from freezing and any temporary user of
the area would augment the heat requirement with a push of a
button. The timer has the facility to be able to adjust its time
period in the field. It is pre-set from the factory at the maximum
30 minute delay.

SINGLE PHASE APPLICATIONS

These control panels were primarily designed to handle three
phase loads. This is why the contactors and power supply ter-
minal blocks provided with each panel have three poles. Except
for control panels with Time Delay and Percentage Timer options
contactors are rated and wired for 50 amps per pole. Where
fuses are required the fuse blocks provided have three poles
rated at 60 amps per pole. If the power supply is single phase
and the load is single phase, these panels can be used provided
the electrical loading on the wires and components are within
acceptable limits. The electrician must see to it that proper termi-
nals are chosen (L1 & L2 for single phase) such that the primary
of the control transformer is energized . See typical wiring dia-
grams, Figures 1 and 3.

BALANCED THREE PHASE APPLICATIONS

Single phase infrared heaters can be wired to a three phase cir-
cuit under the following conditions. In applications where the
infrared heaters are single phase and the supply power is three
phase, the electrical load must be balanced across each of the
three phases. In order to accomplish this the heaters must be
used in combinations of three heaters equally rated. In this
installation, one heater would be wired to L1 and L2, the second
would be wired to L2 and L3, and the third wired to L3 and L1.
See typical wiring diagrams, Figures 2 and 4

L1 L2

HTR 1

HTR 2

HTR 3

TYPICAL WIRING DIAGRAMS

NOTE: Control wiring not shown for clarity. Refer to wiring diagrams with control panels.

Figure 2: Three phase supply- Three double element

heaters two stage control per heater.
Balanced three phase with two contactor panel.

L1 L2

HTR 1

HTR 2

HTR 3

Figure 1: Single phase supply- Three double element

heaters two stage control per heater with two
contactor panel