Toshiba HWS-P804XWHM3-E1(TR) Service Manual page 74

Item
8-4. 13) 2-way valve control
Outdoor unit
To control the bypass 2-way valve, reducing the minimum capacity and reducing the pressure increase purpose.
control
Bypass circuit is connect the discharge pipe and the suction pipe of the compressor.
1)Bypass operation start condition
<Heating or hot water supply> Any of the following cases
<Defrosting> Any of the following cases
<Cooling> Any of the following cases
The operation stop in the following cases. (Off cases of 2-way valve.)
<Heating or hot water supply> Any of the following cases
<Defrosting>
<Cooling> Any of the following cases
14) 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.
14-1)Start conditions
14-2)End conditions
AMP Air Conditioning
Operation flow and applicable data, etc.
The operation start in the following cases. (On cases of 2-way valve.)
Pd is the case of X zone.
•(To ≥ B zone) and (compressor operation Hz is low).
Pd is the case of Y zone.
(To ≥ B zone) and (compressor operation Hz is low) and (Operation of the previous time of 12 minutes or less)
•TWI < 36 °C
•TC+TWO<9 °C
•(To ≤ B zone) and (compressor operation Hz is low)
•(To ≤ B zone) and (When the hydro unit is operating release control.)
When the 2-way valve turned on once, it does not turn off for 5 minutes.
•(Pd ≤ Y zone) and (When the compressor rotational speed is
increasing.)
•(Pd ≤ Y zone) and (To ≤ C zone)
•When the compressor is stopped.
•When the compressor is stopped.
•(Compressor rotational speed is increasing.) and (The hydro unit is not
operating release control.)
•When the compressor rotational speed is increasing.
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 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
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
73
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Tg(Pd)
X zone
60.0(3.73)
58.5(3.60)
Y zone
To
A zone
23
21
B zone
5
3
C zone