Toshiba ESTIA HWS-1102H-E, Service Manual

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Toshiba
8-3.
Hydro Unit
Control
3) Circulation pump control
One circulation pump (enhancing pump P2) can be connected to the unit in addition to the built-in circulation pump P1.
DP_SW10-1, 3 within the water heat exchanger enables the built-in pump P1 to be set either to usual energization or
only HP and backup heater energization, and also enables the enhancing pump P2 to be set either to interlocked or
non-interlocked with the built-in pump.
*1 The pump 1 in HP operates only in hot water supply side.
*2 Setting the enhancing pump P2 to non-interlock sets the pump P1 to usual energization.
3-1) Circulation pump (Built-in pump P1)
Pump type: AC motor, rated voltage 230V, manually changeable 3-level pump speed
The pump operation starts when the following condition is met.
• The [HOT WATER] or [ZONE1, 2] button is pressed.
The pump operation ends when the following condition is met.
• Pressing the [HOT WATER] or [ZONE1, 2] button stops the about 1 minute later.
The pump operation stops or re-starts as follows:
• Stops for 30 seconds when the operation mode changes.
• Stops the pump when a boiler instruction is given and 70°C TWI or TWO or THO is met.
• Re-starts the pump when a boiler instruction is given and 65°C > TWI and TWO and THO is met.
Operation when DP_SW10-1 "ON: HP operation only" is selected
• The pump stops only when the hot water cylinder heater is in operation. The pump does not stop with the heating
thermostat off.
3-2) Circulation pump (Enhanced pump P2)
Pump type: AC motor, rated voltage 230V, directly connectable to the unit with the rated output of up to 200W.
DP_SW10-3 enables the pump P2 to be set either to interlock or non-interlock with the built-in pump P1. Setting to
non-interlock sets the pump1 to usual energization.
4) Flow switch operation
Setting the flow switch to On or OFF determines whether water flows in the water heat exchanger.
When start the hot water supply, heating, or cooling operation, failure to determine whether water flows does not energize
HP, the backup heater, and booster heater. The "A01" error code display also blinks in this case.
Item Operation flow and applicable data, etc.
Item Heater ON / OFF Initial value Switch
AC pump
Existence &
position setting
01: None
02: None
03: Enhanced pump (P2)
Interlock / Non-interlock with
built-in pump
OFF: Interlock
*2
SW10-3
04: None
Model Criteria for water flowing Criteria for water not flowing
HWS-802**-E Flow 13 L/min or more Flow less than 13 L/min
HWS-1402**-E Flow 17.5 L/min or more Flow less than 17.5 L/min
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 52 Monday, October 5, 2009 2:09 PM