Bard TCS22-***-003 - Manual (Page 27)

2100-444-003A
Page 21
4.0 OPERATION
This section describes the sequence of operation of the controller. The tools available for
monitoring and controlling the air-conditioners for both on-site and remote operations are explained. The
remote trending, alarming, and site setup software are detailed.
4.1 General
This section will describe the sequence of operation of the controller. Cooling , heating,
dehumidification, and alarm sequences are explained.
4.2 Sequence of Operation
This sequence of operation is for the TCS22-002 software package. Different software packages
have different sequences of operation. Check the last three numbers of the TCS22 model number on the
serial plate to verify that the sequence installed is "002"
4.2.1 COOLING SEQUENCE WITH ECONOMIZERS
Free cooling setpoint, that is, the outdoor conditions at which cooling is handled by the
economizer, can be configured to use either enthalpy or dry bulb temperature.
Outdoor Enthalpy or Temperature is calculated from Outdoor Temperature and/or Outdoor
Humidity sensors. If the outdoor enthalpy or temperature is below the free cooling setpoint, free cooling
is enabled and Output #15, Free Cooling is lit.
Active Cooling Setpoint is compared to Space Temperature . If Space temperature is above
Active Cooling Setpoint, stage 1 cooling is enabled. If Free Cooling is enabled, Economizer and Blower
of the Unit are energized. If Free Cooling is inhibited, Compressor and Blower of the Unit are
energized.
If the Space Temperature is above Active Cooling Setpoint plus 2 deg F o , stage 2 cooling is
enabled. If Free Cooling is enabled, Compressor and Blower of the Unit are energized.
4.2.2 HEATING SEQUENCE
Active Heating Setpoint is compared to Space Temperature. If Space temperature is below
Active Heating Setpoint , Stage 1 heating is enabled. Heater and Blower of the Unit are energized.
4.2.3 FAN SEQUENCE
The Evaporator Fan is programmed for continuous operation. Operator can change continuous
operation to cycle on demand. Lag unit fan will cycle on demand.