Mitsubishi Electric e Series Service Handbook page 112

[ VII Control ]
2. Normal Thermo-ON/OFF operations
DIFF1 = 2 ºC (Initial setting)
DIFF2 = 2 ºC (Initial setting)
sensor
Built-in Outlet-water-tempera-
thermistor ture-based control
Water temperature
External
control based on the
water
external water tem-
temperature
perature reading
1) Thermo-ON/OFF temperature conditions
Water temperature control
On/Off control in case of Heating mode
High
Set Temp +
Differential
+0.20
Water
Set Temp
Temp
-0.20
Set Temp -
Differential
Low
On/Off control in case of Cooling mode
High
Set Temp +
Differential
+0.20
Water
Set Temp
Temp
-0.20
Set Temp -
Differential
Low
2) Thermo-ON/OFF conditions (time)
Thermo-
Temperature
ON
changes
The unit will stay in operation
of 60 seconds after the unit
went into when the Thermo-ON
conditions were met.
HWE1417B
Control method
Outlet water temperature is below the
"Preset temperature - DIFF1 (ºC)".
(Heating)
OR
Outlet water temperature is greater
than "Preset temperature + DIFF1
(ºC)". (Cooling)
Except the short-cycling protection
mode.
External water temperature is below
the "Preset temperature - DIFF1 (ºC)".
(Heating)
OR
External water temperature is greater
than "Preset temperature + DIFF1 (ºC)".
(Cooling)
Except the short-cycling protection
mode.
0.2-5.0C
(Variable)
Thermo-OFF differential (DEFF1)
Comp frequency down
Same frequency
Comp frequency up
Thermo-ON differential (DEFF2)
0.2-5.0C
(Variable)
0.2-5.0C
(Variable)
Thermo-ON differential (DEFF1)
Comp frequency up
Same frequency
Comp frequency down
Thermo-OFF differential (DEFF2)
0.2-5.0C
(Variable)
Thermo-OFF temperature
Preset water
Thermo-
temperature
OFF
The unit will remain stopped if the anti-short-
cycling protection is in effect.
1.The unit will remain stopped for 3 minutes
after the unit stopped when the Thermo-OFF
conditions were met.
2.After the compressor stops, it will remain
stopped for 12 minutes.
Refer to section -8- "Anti-short-cycling protection"
(page 100) for detailed information about
anti-short-cycling protection function.
Thermo-ON
conditions
Thermo-OFF
Thermo-ON
When the water temperature is controlled based on the
outlet water temperature, compressor frequency will be
controlled in the way that the target water temperature will
be maintained.
Thermo-ON
Thermo-OFF
- 103 -
Thermo-OFF conditions
Outlet water temperature is greater than
the "Preset temperature + DIFF2 (ºC)".
(Heating)
OR
Outlet water temperature is below the
"Preset temperature - DIFF2 (ºC)".
(Cooling)
At least 60 seconds have passed since
the last Thermo-ON.
External water temperature is greater
than the "Preset temperature + DIFF2
(ºC)". (Heating)
OR
External water temperature is below
the "Preset temperature - DIFF2 (ºC)".
(Cooling)
At least 60 seconds have passed since
the last Thermo-ON.
GB