31
Start-up and Operation
Cooling mode:
Dual system
When the system is started, the water pump shall run at once. After a period of 2MIN, the water
pump continues to run. When return water temperature reaches or more, No.1 compressor will
be started. In one minute, No. 2 compressor will be started provided return water temperature
is more than . On condition that the cooling requirement is met, and return water temperature
is lowered to , No. 1 compressor will be stopped. In case return water temperature continues to
lower to , No. 2 compressor will also be stopped. Later on, as load is increased and return water
temperature is raised to , No. 1 compressor will be started again. In case return water temperature
continues to increase to , No. 2 compressor will also be started. The water pump will not stop
unless the water chiller is shut down.
Single system
When the system is started, the water pump shall run at once. The water pump continues to run
after 2MIN; and in case return water temperature is over , the compressor will be started. On
condition that the cooling requirement is met, and return water temperature is lowered to , the
compressor will be stopped. Later on, as load is increased and return water temperature is raised
to , No. 1 compressor will be started again. The water pump will not stop unless the water chiller
is shut down.
Heating mode:
Dual system
When the system is started, the water pump shall run at once. 2min later, the water pump remains
in operation; if return water temperature is below , No. 1 compressor will be started. 1MIN later, if
return water temperature is below, No. 2 compressor will be started. If the heating requirement is
met and return water temperature is increased to , No. 1 compressor will be stopped; and if return
water temperature continues to rise to, No. 2 compressor will also be stopped. Later on, load is
changed; if return water temperature is lowered to , No. 2 compressor will be started; and return
water temperature continues to drop to , No. 1 compressor will also be started. The water pump
will not stop unless the water chiller is shut down.
Single system
Operation of water pump, fan and compressor of single system is the same as that of dual
system. The only difference is that when return water temperature of single system is below ,
the compressor will be started, and when return water temperature of single system is over , the
compressor will be stopped.
Ambient temperature operation limit
Outdoor ambient temperature
Cooling mode
Heating mode
mini
21
℃
-7
℃
max
43
℃
21
℃
Leaving water temperature
Cooling mode
Heating mode
mini
5
℃
40
℃
max
15
℃
50
℃
