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Toshiba
8-3.
Hydro Unit
Control
2)Heater control
2-1) Hot water supply operation
During a hot water heat pump operation, the unit energizes the hot water cylinder heater (2.75 kW) when all the
following conditions are met. Note that when the hot water supply set temperature (TSC_F) is reached, the unit stops
energizing the heater.
• When 30 minutes has passed after the hot water heat pump operation started.
• The water inlet temperature (TWI) reaches 50°C.
• The hot water cylinder sensor reaches the HP_OFF temperature (45°C-FC).
• The HP_ON temperature (38°C-FC) is reached without the hot water HP status.
• HOT WATER BOOST operation is in progress.
2-2)Heating operation
1)Heater control at the time of heat pump operation
• Object to be controlled: Backup heater
The backup heater control starts when 13 minutes has passed after the heating heat pump operation started and
select the ZONE (A-D). The backup heater control increases, decreases, or maintains the number of heaters
every 10 minutes (FC) depending on the difference between the heating set temperature (TSC_F) and the heater
outlet temperature (THO). When the heating set temperature (TSC_F) is reached, the hydro stops energizing
the backup heater.
The single-phase model of 3 kW has the backup heater 1 only.
The three-phase model of 6 kW has heater 1+2 of 6 kW.
Item Operation flow and applicable data, etc.
85
HP_OFF(45)
TSC_H
TTW
Z zone
Diff : 2K
TSC_H-4
Hot Water Boost
Heater on only with
Hot Water Boost in operation
Abnormality detection
HP_ON (38)
(Hot water HP start)
Y zone
Heater off
X zone
Heater on
(Heater on without
hot water HP)
70
TSC_F-4
TSC_F-6
TSC_F-2
THO
E zone
D zone
C zone
B zone
A zone
Diff : 2K
Diff : 2K
Diff : 2K
Abnormality detection
Heater off
KEEP
Heater output down every
5, 10, 15, or 20 minutes
Heater output up every
10, 20, 30, or 40 minutes
Status Heater ON / OFF
Heater 1 Backup heater 3 kW = ON
Heater 2 Backup heater 9 kW = ON
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 50 Monday, October 5, 2009 2:09 PM