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4
Installation
4.2 Water/Ambient Loop Quality and
System Preparation
<Water>
General
• The water in both primary and sanitary circuit should be clean
and with pH value of 6.5-8.0
• The followings are the maximum values;
Calcium: 100 mg/L, Ca hardness: 250 mg/L
Chloride: 100 mg/L, Copper: 0.3 mg/L
• Other constituents should be to European Directive 98/83 EC
standards.
• In known hard water areas, to prevent/minimise scaling, it is
beneficial to restrict the routine stored water temperature
(DHW max. temp.) to 55°C.
Anti-Freeze
Anti-freeze solutions should use propylene glycol with a toxicity
rating of Class 1 as listed in Clinical Toxicology of Commercial
Products, 5th Edition.
Note:
1. Ethylene glycol is toxic and should NOT be used in the
primary water circuit in case of any cross-contamination
of the sanitary circuit.
2. For 2-zone valve ON/OFF control, propylene glycol
should be used.
Installation (primary water circuit)
• Before installation heat pump unit, thoroughly cleanse pipework
of building debris, solder etc using a suitable chemical cleansing
agent.
• Flush the system to remove chemical cleanser.
• The responsible installer should decide if anti-freeze solution is
necessary for each site's conditions. Corrosion inhibitor however
should ALWAYS be used.
When using chemical cleansers and inhibitors always follow
manufacturer's instructions and ensure the product is appro-
priate for the materials used in the water circuit.
How to access Internal Components and
Control and Electrical Box
<A> Opening the front panel
1. Remove the two lower screws and two upper screws.
2. Slide front panel upwards to slightly and open carefully.
3. Disconnect the relay connector connecting main remote
controller cable and the control board cable.
<B> Accessing the back of the control and electrical box
The control and electrical box has 8 holding screws and is
hinged on the right hand side.
1. Remove the 4 screws fixing the metal plate (with a warning
label) in front of the electrical box, then lift the plate to remove.
2. Remove the holding screws on the control and electrical box.
3. The control and electrical box can then be swung forward on
the right hand hinges.
Note:
After servicing, re-secure all cables using straps provided.
Reconnect main remote controller cable to its relay connector.
Replace front panel and resecure screws.
<Ambient loop>
General
• The water in both primary and sanitary circuit should be clean
and with pH value of 6.5-8.0
• The followings are the maximum values;
Calcium: 100 mg/L, Ca hardness: 250 mg/L
Chloride: 100 mg/L, Copper: 0.3 mg/L
• Other constituents should be to European Directive 98/83 EC
standards.
• Installer MUST fill water or the following antifreeze solution
mix when filling the ambient loop.
• The water in Ambient loop should be clean and with pH value
of 6.5-8.0.
38 WT% propylene glycol
29 WT% bioethanol
25 WT% ethylene glycol
Note: DO NOT use Inorganic brine.
• Fit the local supply particle filter on the incoming pipe.
• Use the heat pump unit ONLY in a closed system for ambient
loop. Using the system in an open system will lead to
excessive corrosion.
Installation (Ambient loop)
• Before installation of heat pump unit, thoroughly cleanse
pipework of building debris, solder etc using a suitable chemical
cleansing agent.
• Flush the system to remove chemical cleanser.
When using chemical cleansers and inhibitors always follow
manufacturer's instructions and ensure the product is appro-
priate for the materials used in the circuit.
Amount of brine required in the ambient loop
• As a measure of the brine filling amount, please make
approximation of 1 L/m of collector hose length.
en
18
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