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Temperzone Unit Controller 6 - Operation and installation- Hydronic
Suction side superheat is defined by the difference between the evaporating
temperature and the compressor suction line temperature. The evaporating
temperature normally is calculated from the suction line pressure.
HWP291 is a single compressor with two coils system unit. EEV1 and EEV2
operate synchronized by same a pair of control signal (suction temperature and
pressure). Temperzone has selected optimum EEV control parameters to
guarantee best unit performance when cooling and when heating.
5.8.
Demand response management
The UC6 provides 2 or 3 inputs (depends on unit configuration) for the D.R.E.D.
function. D.R.E.D. stands for "Demand Response Enabling Device". The aim of the
function is to have a measure of control over the total energy that is consumed
by the unit as measured over a half hour period. Refer to Australian draft
standard AS4755.3.1 for detailed information.
The UC6 achieves compliance to the standard by "duty cycling" or stopping one or
two compressors.
Inputs for the DRED function are:
DI8
DI9
If the unit is configured with Quiet mode enabled then input DI9 is not available
for the DRED function.
6. Protection functions
6.1.
Minimum compressor run time
Minimum time that a compressor must run when started. This ensures that an
adequate amount of compressor lubricating oil is returned to the compressor after
start up.
6.2.
Minimum compressor off time
Minimum time that a compressor must remain off after it has stopped. This time
ensures that a compressor is not re-started while there still is a high pressure
differential across the compressor.
6.3.
Minimum compressor cycle time
A compressor is allowed a maximum of 10 starts per hour (one start per 6
minutes). This limits the amount of stress on the compressor motor.
6.4.
High pressure protection (HP)
If high pressure transducers are connected to inputs HP1 then a compressor is
switched off when the discharge line pressure reading exceeds 42.0bar.
DRM1
DRM2 or DRM3 (configurable)
Display indication with DRM1 active
Display indication when timer is active
Display indication when timer is active
Display indication when timer is active
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