21
SEQUENCE OF OPERATION
S T A N D B Y M O D E
All control outputs are off and the control is waiting for
a thermostat demand. The control initiates action when a
thermostat call is received.
C O O L I N G M O D E
Air-Conditioning (A/C) Cooling Demand
When the thermostat calls for cooling (Y), the control
energizes the selected heat/cool blower speed.
H E A T I N G M O D E
Heat Blower ON Delay
When the thermostat calls for heat (W) the pump runs
for 15 seconds, then the blower motor operates at selected
heating speed. When the call for heat is satisfied the
blower switches to low fan speed for two minutes to
remove remaining heat from the system.
Heat Blower OFF Delay
When the heating thermostat demand (W) is removed,
the control de-energizes the circulating pump and then
de-energizes the blower motor.
Blower timing begins when the thermostat is satisfied.
The control returns to standby when the blower off time
is complete.
Control inputs are continuously monitored to ensure
the call for heat remains.
Off Season Circulation Timer
All RedZone
TM
DVS models are equipped with a
circulation timer. It is normal operation for these
models to automatically run the circulation pump for
a period of 2 minutes every 12 hours.
R E D Z O N E
T M
D V S S E R I E S A I R H A N D L E R M A N U A L
