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Table 5.
List of system and DH faults (continued)
Fault
FAULT - DEHUMIDIFIER WHEEL ROTATION
FAULT – REACTIVATION ELECTRIC HEATER
OVERTEMPERATURE
List of System and DH Warnings
WARNING – REACTIVATION LOW TEMP
LOW TEMP (Reactivation Low Temperature Fault Set point).
The adjustment range is 90.0 to 110.0. The parameter
corresponds to the value of the set point in engineering units
(Typical set point = 110°F).
Proportional Control Loops/ DH Interlocks
Reactivation Heat Energy Control
•
The reactivation electric heater solid state relays will
accept a 0-10V modulating signal from the logic controller
to control the reactivation inlet air temperature.
•
This is sensed by the reactivation air inlet temperature
transmitter (TC01).
•
The reactivation inlet temperature set point will vary based
on the reactivation outlet control PID loop to maintain
maximum, required reactivation inlet temperatures over a
wide range of DH load conditions.
•
When the reactivation outlet PID loop output is 0% the
reactivation inlet set point will be 200°F.
•
When the reactivation outlet PID loop output is 100% the
reactivation inlet set point will be 325°F.
SRV-SVX04C-EN
Description
Limit switch (LS01) is wired normally closed and located inside the dehumidifier wheel
compartment next to desiccant wheel. As the wheel turns, a cam fastened to the wheel housing
opens this limit switch.
If limit switch (LS01) is not opened once every 600 seconds, a timer in (PLC1) times out the
system is faulted.
The system goes into the shutdown sequence. See
p. 9
and
"Auxiliary Dry Contacts - Operational System States," p.
The dehumidifier will be held in the Fault condition by (PLC1).
To restart the dehumidifier:
1.
Clear the alarm pressing the acknowledge ACK on the HMI.
2.
Reset the overload, and go to the ALARM screen, and press the F4 RESET key, which
resets the PLC.
To restart the system:
1.
Move the selector switch (SS01) to the OFF position.
2.
Move the (SS01) back to the AUTO or MANUAL position.
Temperature switch (TS01) is in the reactivation electric heater and will detect extreme
temperature level or heat buildup.
Temperature switch (TS01) is in the reactivation heated to duct and will detect extreme
temperature level or heat buildup.
The system goes into the shutdown sequence. See
p. 9
and
"Auxiliary Dry Contacts - Operational System States," p.
The dehumidifier will be held in the Fault condition by (PLC1).
To restart the dehumidifier:
1.
Clear the alarm pressing the acknowledge ACK on the HMI.
2.
Reset the overload, and go to the ALARM screen, and press the F4 RESET key, which
resets the PLC.
To restart the system:
1.
Move the selector switch (SS01) to the OFF position.
2.
Move the (SS01) back to the AUTO or MANUAL position.
Installation - Controls
"Normal shutdown sequence of operation:,"
9.
"Normal shutdown sequence of operation:,"
9.
11
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