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Operation
Reading the Temperature
Controllers
See Graco form 309100 for information on the CB100
temperature controller.
Temperature Out of Range
The temperature controllers monitor the RTD readings
from each zone and adjust the electrical power to the
zone to maintain the temperature at the set value (SV)
for each zone.
The 2-zone control (243698) has a Heat On light that
indicates the power disconnect on the panel is on and
that there is power to each connected zone. The High
Temperature Alarm light is a visual indication only. It
is lit when the zone temperature is above the SV of the
control by a Graco preset value of 40° F (22° C).
The 4-zone control (243699) has a power disconnect
switch that provides power to the temperature controls.
Power is not applied to the heat zones until the Heat On
switch is turned on. The Heat On light will illuminate,
indicating power is applied to the zones. Unlike the
2-zone control, the 4-zone control shuts down power to
the heat zones when a high temperature alarm indicates
the zone temperature is above the SB of the control by a
Graco preset value of 40° F (22° C).
12
Operation
The 4-zone control also has provisions for external
equipment to monitor if a high temperature alarm is
active and if all zones are within limits. "Within Limits"
means that the temperature of each zone must be in the
range of 35°F (19° C) below the SV to 40° F (22° C)
above the SV, as shown in Fig. 4
35°F (19° C)
below the SV
F
. 4
IG
.
40° F (22° C)
SV
above the SV
Within limits
(green READY light on)
HIGH TEMP
ALARM
309213G
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