Hitachi RWM-(H)FSN3E, Service Manual

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5 Control system
SMGB0070 rev. 1 - 08/2011
134
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Room Thermostat control
YUTAKI S unit can be used with two different Room Thermostats available as accessories:
- ON/OFF Thermostat (ATW-RTU-01)
- Intelligent Room Thermostat (with Opentherm communication) (ATW-RTU-02) with extension room thermostat for
second circuit (ATW-RTU-03)
Thermostat Type is selected using the parameter list on user interface:
CODE REF Description Default Value
Room thermostat type
3-002 RTT RTT ( ON/OFF, Intelligent) ON/OFF
ON/OFF Thermostat (accessory ATW-RTU-01)
When the ON/OFF Room Thermostat temperature setting is higher than room ambient temperature, Room Thermostat
communicates with RF Receiver in order to close relay signal and Thermo ON Condition must be applied.
Unit
ON/OFF Thermostat
Receiver
Wireless
Thermostat
Thermostat Receiver Unit status Pump status (ECO)
Demand Closed relay signal between terminals 5-6 Thermo ON unit Pump runs
No demand Open relay signal between terminals 5-6 Thermo OFF unit Pump stops after overrun time *
N O T E
For more information on how to work water pumps, see chapter on Water pump control.