P5 Silent Mode; P6 Holiday Mode - Toshiba HWS-G1901CNMR-E Service Manual

Domestic Hot Water Heat Pump
7.5

P5 SILENT mode

This mode decreases the fan speed to D5 (Min fan speed) in order to minimize the sound
emissions
The DHW-HP is controlled by the A1 AUTO operation mode
The unit starts when BBT3 (T Tank t) < A1 (T AUTO) -5°C
The unit stops when BBT3 (T Tank t) = A1 (T AUTO)

90
Comp ON
80
Comp OFF
Fan ON
70
Fan OFF
60
50
40
30
20
10
0
 System operating in AUTO mode
 Operating mode changed to SILENT.
Fan speed lowers from D6 (AUTO Speed) SP of 57% (factory set point) to D5 (Min Fan Speed)
SP of 40% (factory set point)
 Operating mode returned to AUTO mode
Fan speed raises from D5 (Min Fan Speed) SP of 40% to D6 (AUTO speed) of 57%
Note: In SILENT mode the controlled temperature set point is from AUTO mode.
7.6

P6 HOLIDAY mode

DHW-HP does not start when the water heating is required. The HP is OFF except during
Legionella control, which is still activated once a week on the selected day from D15 (Legionella
date).
The HOLIDAY mode is connected to B4 (Hot on Time). After the HOLIDAY period is completed,
the unit goes back to the previous mode of operation.

T1 T air in
FanSpeedSet
19
T2 air out T3 T water top
R3 Fan R4 HP
Service Manual
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