94
7-4.
Outdoor unit
control
13) Start up from hibernation
This control operates at startup, in order to warm up the compressor by the heat from the water.
System is operated at a defrost cycle when the start condition is satisfied.
System is switched to the normal heating operation when the end condition is satisfied.
13-1)Start conditions
This control is operated when starting the compressor in a state that all of the following conditions is satisfy.
•Compressor off time is 2 hours (30 minute)* or more (Also start up at the first time after turn on the power.)
•TD ≤ 40°C and TWI ≥ 25°C and TO ≤ 3°C
* ( ): 801, 1101
13-2)End conditions
When one of the following conditions is satisfy, operation is switched to the normal heating.
•10 minutes has passed since operation started.
•TD ≥ TWI + 10°C
•TG ≥ TWI TG: Condensing temperature calculated from the Pd
•TWI < 25°C
14) Liquid injection control
In discharge temperature high condition, for example ambient temperature is low or circulation water temperature is
high, controlling INJ_2-way valve and INJ_PMV will work.
1)INJ_2-way valve control
The operation start in the following cases.
* Heating operation and hot water supply operation only. (except defrost operation)
•10 sec passed since compressor ON and TD is in X zone.
The operation stop in the following cases. When the INJ_2-way valve
turned on once, it does NOT turn off for 15 minutes.
•When the compressor is stopped.
•During defrost operation.
•INJ_PMV opening value is small and TD is in Y zone (*).
* A°C is 60°C or 70°C, it is depend on PD [MPa].
2)INJ_PMV control
The operation start in the following cases.
* Heating operation and hot water supply operation only. (except defrost operation)
•20 sec passed since compressor ON and TD is in X zone.
INJ_PMV is controlled between 5 and 300 pulses during an operation.
INJ_PMV is controlled with temperature difference between TD sensor and target TD temperature TD0.
TD0 is 85°C just after INJ_PMV control starts, and changes to 86°C, 87°C, 88°C, ..., up to 95°C in every minute.
After TD0 reach to 95°C, INJ_PMV is controlled with temperature difference between TD sensor and target TD0
95°C.
The operation stop in the following cases.
•When the compressor is stopped.
•During defrost operation.
•TD is in Y zone.
Item Operation flow and applicable data, etc.
80°C
TD [°C]
X zone
Y zone
A°C
85°C
TD [°C]
X zone
Y zone
84°C
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