Mitsubishi Electric CRHV-P600YA-HPB, Service Handbook

Page: 104 / 170

[
VII
Control ]
- 97 -
HWE1312A GB

Multiple system control (inlet-water-temperature-based control)

Multiple system control (outlet-water-temperature-based control)
2) Thermo-ON/OFF conditions (time)
3. When the units are stopped after the water temperature has reached the upper limit setting
DIFF1 = 2 ºC (Initial setting): “1015” Digitally set value
DIFF2 = 2 ºC (Initial setting): “1016” Digitally set value
Tmax=67 ºC
When the water temperature is controlled based on the
representative inlet temperature, compressor frequency will
be controlled as described in section -3-"Compressor
frequency" (page 88). (Automatic operation according to the
preset temperature)
When the water temperature is controlled based on the
external water temperature sensor reading (outlet water
temperature), compressor frequency will be controlled in the
way that the target water temperature will be maintained.
The number of units to be in operation will be determined by
the main unit to maintain the proper operating frequency of
each unit.
When the water temperature is controlled based on the inlet
temperature, compressor frequency will be controlled as
described in section -3- "Compressor frequency"(page 88).
(Automatic operation according to the preset temperature)
Individual
system
sensor
Control
method
Thermo-ON conditions
Thermo-OFF
conditions
Refer to the
section on indi-
vidual system.
Built-in
thermistor
External
water
temperature
Inlet-water-
temperature-
based control
Outlet-water-
temperature-
based control
Water tem-
perature con-
trol based on
the external
water temper-
ature reading
When SW2-5 (operation restora-
tion after forced stoppage) is set to
ON
Inlet water temperatures are lower
than the "Inlet temperature at
Thermo-OFF DIFF2ºC" AND outlet
temperatures are lower than
"Tmax - DIFF1ºC."
"External water temperature of
each unit > Tmax" or "Inlet water
temperature of each unit > Tmax"
When SW2-5 (operation restora-
tion after forced stoppage) is set to
OFF
Inlet temperatures are lower than
"Tmax - DIFF1ºC" AND outlet tem-
peratures are lower than "Tmax -
DIFF1ºC."
DIFF2/2°C
DIFF2/2°C
Thermo-OFF temperature
Preset water temperature
Inlet water temperature
changes
DIFF2/2°C
DIFF2/2°C
Thermo-OFF temperature
Preset water temperature
Outlet water temperature
changes
Thermo-OFF temperature
Preset water
temperature
Temperature
changes
Thermo-
ON Thermo-
OFF
The unit will stay in operation
of 60 seconds after the unit
went into when the Thermo-ON
conditions were met. The unit will remain stopped if the anti-short-
cycling protection is in effect.
1.The unit will remain stopped for three minutes
after the unit stopped when the Thermo-OFF
conditions were met.
2.After the compressor stops, it will remain
stopped for 10 minutes.
Refer to section -7- "Anti-short-cycling protection"
(page 91) for detailed information about
anti-short-cycling protection function.