10
3. System components
•
ACH1 Control box
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PQFY water heating unit
•
Outdoor unit (any type)
•
DHW thermistor
•
UFH thermistor
•
UFC thermistor
•
5 wire adapter
4. Selecting an installation site
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Avoid locations in direct sunlight.
•
Avoid locations exposed to stream or oil vapour.
•
Avoid locations where combustible gas may leak, settle or be generated.
•
Avoid installation near machines emitting high-frequency waves.
•
Avoid places where acidic solutions are frequently handled.
•
Avoid places where sulphur-based or other sprays are frequently used.
5. Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accordance with "Engineering
Standards for Electrical Installation" and supplied installation manuals. Special circuits should also be
used. If the power circuit lacks capacity or has an installation failure, it may cause a risk of electr ic
shock or fir e.
•
Install the unit to prevent any of the control circuit cables (remote controller, transmission cables) from direct contact with the power cable
outside the unit.
•
Ensure that there is no slack on all wire connections.
•
Some cables (power, remote controller, transmission cables) above the ceiling may be prone to be bitten by mice. Insert the cables into
metal pipes for protection.
•
Never connect the power cable to leads for the transmission cables. Otherwise the cables could be broken.
Types of control cables
Wiring transmission cables
•
Types of transmission cables
Design wiring in accordance with the following table
•
Cable diameter
More than 1.25 mm
2
5.1. Connecting the thermistor cables
The ACH1 control box is required for the Heat Pump Boiler (PQFY) to switch between domestic hot water and under floor piping heating and
cooling modes. The extra interface, i.e., the ACH1 control box is necessary because when operating in heating, a different temperature must be
monitored often from a different position than when the system is operating in cooling. Thermistor cables (T1, T2, and T3) are attached to ‘A’
terminals [See figure 5.1]. Thermistors are attached to pipe/cylinder [see figure 5.1.1]. For further details on setting up the unit and the unit logic,
see section 6.
Caution:
Do not route the thermistor cables together with power cables.
Caution:
When the lead wire is too long, cut it to the appropriate length. Do not bind it in the box.
Caution:
Take proper measures not to miswire.
