Heating or cooling mode
CNT-SVX06B-EN 29
Heating or cooling mode
The heating or cooling mode can be determined in one of two ways:
• By a communicated signal from a BAS or a peer controller
• Automatically, as determined by the controller
A communicated heating signal permits the controller to heat only. A
communicated cooling signal permits the controller to cool only. A com-
municated auto signal allows the controller to automatically change from
heating to cooling and vice versa.
In heating and cooling mode, the controller maintains the zone tempera-
ture based on the active heating set point and the active cooling set point,
respectively. The active heating and cooling set points are determined by
the occupancy mode of the controller.
When no communicated signal is present (stand-alone operation) or the
communicated signal is auto, the controller automatically determines the
heating or cooling mode.
Fan operation and status
The Tracer ZN511, configured for heat pump control, supports single-
speed fan applications. The fan can be configured for continuous or
cycling operation for both heating and cooling mode operation. When con-
figured for continuous operation, the fan normally runs continuously dur-
ing the occupied, occupied standby, and occupied bypass modes. When
configured for cycling operation, the fan will cycle with compressor opera-
tion during the occupied, occupied standby, and occupied bypass modes.
During the unoccupied mode, the fan cycles with compressor operation
regardless of the fan configuration. The fan will de-energize when either
an off signal is communicated to the control or when the fan speed switch
is set to OFF. The ability to enable or disable the controller’s associated
fan speed switch is also configurable.
Compressor operation
The Tracer ZN511 supports applications with one or two compressors.
The compressor(s) will cycle to meet zone temperature requirements.
Compressor operation will be overridden by a preset 3-minute minimum
on/off time delay in order to maintain oil return when the unit is either
initially energized, manually reset, switched between modes, or cycled
within a single mode. If a compressor diagnostic occurs, the controller
ignores the minimum on/off time and locks out the compressor. If a com-
pressor is locked out, the smart reset function is enabled (see “Smart
reset” on page 31).
For two-compressor units, if one of the compressors is locked out as a
result of either a Low Temperature Detection diagnostic, a Leaving Water
Temp Failure diagnostic, or a High-Low Pressure Cutout diagnostic, the
operation of the other compressor will not be affected.
To Next Page
Loading...
Need help?
General
