42
TC4-2N6F.rev.07
Description of Operation ( Refer to figure 6 below)
When the room temperature falls to
"room set point - heater offset - heater
differential"
(point 13), the heaters turn on. When the room temperature
rises to
"room set point - heater offset"
(point 14), the heaters turn off.
TO ADJUST THE HEATER DIFFERENTIAL
The heater differential can be adjusted to 1°F(0.6°C) or 2°F(1.1°C):
Set switch # 5 to ON to adjust the
heater differential to 1°F (0.6°C).
Set switch # 5 to OFF to adjust the
heater differential to 2°F (1.1°C).
Adjusting the Heater Parameters
Heaters
11
TC4-2N6F.rev.07
It may be recommended to install a latch switch on the zone A or
zone B curtain power unit to stop the stage 1, 2 and 3 cooling fans
as the curtains open for natural ventilation (refer to the USING
THE CONTROLLER section).
ALL WIRING MUST BE DONE BY AN AUTHORIZED
ELECTRICIAN AND MUST COMPLY WITH APPLICABLE
CODES, LAWS AND REGULATIONS. BE SURE POWER
IS OFF BEFORE DOING ANY WIRING TO AVOID
ELECTRICAL SHOCK AND EQUIPMENT DAMAGE.
Temperature Probes
The controller is supplied with one room probe for zone A connected to
terminal # 1, one room probe for zone B connected to terminal # 2 and one
outside probe connected to terminal # 4.
CAUTION : The probes operate under low voltage and are isolated from the
supply. Be sure the probe cables remain isolated from all high voltage
sources. Do not route the probe cables and other power cables through the
same electrical knockout. Do not run the probe cables next to other power
cables. When crossing over other cables, cross at 90
o
.
Extending the Probes
Each probe can be extended up to 500 feet (150 meters). To extend a probe:
Use a shielded cable of outside diameter between 0.245 and 0.260
in (6.22 and 6.60 mm) to ensure the cable entry is liquid-tight (the
cable dimension should not be under 18 AWG).
It is preferable to weld the cable joint to ensure a proper contact
between the two cables.
Do not ground the shielding.
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