Manual# I27028 5-3 Rev. 2 – 11/22/2017
6. After the machine is switched on, there will be a normal delay up to 30 seconds
before the fans start. As the machine is warming to normal operating temperature
(first 30 minutes of machine operation), the unit will not display the Reactivation Low
Temperature warning.
7. Reactivation Energy Modulation Control.
ELECTRIC
Reactivation electric heater solid state relays accept a 0-10V modulating signal
from the logic controller to control Reactivation inlet air temperature, as sensed by
the reactivation air inlet temperature thermocouple (TC01). The reactivation inlet
loop temperature set point will be varied based on the reactivation outlet PID loop
to maintain required reactivation inlet temperatures over a wide range of DH load
conditions. The reactivation outlet temperature thermocouple (TC02) set point
is120°F (R05 and R10) and 130°F (R15).
When the reactivation outlet PID loop output is 0% the reactivation inlet set point
will be 120°F/130°F and when the reactivation outlet PID loop output is 100% the
reactivation inlet set point will be 300°F.
Electric heater banks are staged as follows:
• The electric heater bank(s) closest to the desiccant wheel is controlled via
a set of solid state control relays which proportionally modulates the heat
required from this bank based upon heat demand.
• Subsequent heater banks are then staged on individually as required,
when the control signal to the solid state relay exceeds 90% full scale for
90 seconds. Upon incrementing a heater bank, the proportional signal will
back down to minimize heater temperature overshoot.
• Heater banks are decremented when the control signal to the solid state
relay drops to less than 5% for 40 seconds. Upon decrementing a heater
bank, the proportional signal will rise to minimize heater temperature
undershoot.
GAS
Reactivation heater modulating gas valve accepts a 0-10V modulating signal from
the logic controller to control Reactivation inlet air temperature, as sensed by the
reactivation air inlet temperature thermocouple (TC01). The reactivation inlet loop
temperature set point will be varied based on the reactivation outlet PID loop to
maintain required reactivation inlet temperatures over a wide range of DH load
conditions. The reactivation outlet temperature thermocouple (TC02) set point
is120°F (R05/R10) or 130°F (R15).
When the reactivation outlet PID loop output is 0% the reactivation inlet set point
will be 120°F/130°F and when the reactivation outlet PID loop output is 100% the
reactivation inlet set point will be 300°F.
5.3 ADJUSTING THE PROCESS AND REACTIVATION DAMPERS
1. It is very important to provide the correct air flows for the process and reactivation
air streams. Dampers are installed in both air streams.
2. Two pressure gauges are installed in the panel on the front of the machine. To
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