Control Wiring; Dip Switch - Hitachi RASM-2VRE Installation And Setup

This shows a basic heating and domestic hot water system as shown on the first page.
Connections are made onto the main terminal block in the monobloc unit.
Hitachi PC-ARFHE
Terminals 3 & 4
Tank Hot Water Sensor
Terminals 5 & 6
Be sure to run the PC-ARFHE Controller cable and tank sensor cables separately to all of
•
the other cables to avoid electrical interference with the control circuit
We recommend taking the immersion heater and the heating pump wiring through local
•
fused switches mounted next to each (Pump—5A and Heater 16A)
The tank hot water sensor is a Hitachi specific part and not a generic item.
•
Please confirm all details with the relevant Hitachi installation manuals.
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All electrical wiring must be carried out by a competent electrician in accordance with
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local and national regulations.
Make sure the immersion heater thermostat is set to maximum
•
Modify DSW4 with the power turned off

Dip Switch

4—Turn pin 3 ON to enable the immersion heater
Dip Switch 4—Turn pin 5 ON to enable ECO Pump mode
Dip Switch 4—Turn pin 6 ON to enable antifreeze mode
Dip Switch 4—Turn pin 8 ON to enable DHW Defrost if desired
DHW Defrost is an optional feature that switches to DHW mode during defrost cycles to pro-
tect the heat exchanger against freezing when using a low loss header instead of a buffer
tank
T: 0191 516 6554

Control Wiring

Earth
NC
NO
COM
E N L
Heating Circulation Pump and Zone Valve
Fed from Heating Controller
Please Note
Dip Switch Settings—DSW4
W: www.seconrenewable.com
Thermostat
Heating Control
Base Station
Base Station
Link terminal L to
COM. Switched
Terminals 13, 14
feed is terminal NO
and 34
Ensure it can switch
at least 5A at 220V
Immersion Heater 3KW—220V
Terminals 30 & 31
Open N E
Earth
N L
3 Port Diverting Valve
Motor Open for Tank Mode
E: info@seconrenewables.com
Earth
Open N E
Terminals 32 & 34