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4
Installation
How to access Internal Components and Control
and Electrical Box
<A> Opening the front panel
1. Remove the two lower screws.
2. Slide front panel upwards 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 a holding screw on the right and is hinged on the
left hand side.
1. Remove the holding screws on the control and electrical box.
2. The control and electrical box can then be swung forward on the left hand
hinges.
Note:
1. Before accessing back of control and electrical box release cables from the
tie strap attached to the cross-support.
2. After servicing, re-secure all cables using straps provided. Reconnect
main remote controller cable to its relay connector. Replace front panel
and re-secure screws at base.
Minimum amount of water required in the space
en
heating circuit
Outdoor heat pump unit
Split model
MXZ-8C112VAM-CN1
MXZ-8C140VAM-CN1
MXZ-8C160VAM-CN1
4.3 Water Pipe Work
Note: Prevent the field piping from straining the piping on the hydrobox by
fixing it to a wall or applying other methods.
Hot Water Pipework
The function of the following safety components of the hydrobox should be
checked on installation for any abnormalities;
• Pressure relief valve
• Expansion vessel pre-charge (gas charge pressure)
The instruction on the following pages regarding safe discharge of hot water from
Safety devices should be followed carefully.
• The pipework will become very hot, so should be insulated to prevent burns.
• When connecting pipework, ensure that no foreign objects such as debris or the
like enter the pipe.
Safety Device Connections
The hydrobox contains a pressure relief valve. (see <Figure 4.3.1>) The connec-
tion size is G1/2" female. The installer MUST responsibly connect appropriate
discharge pipework from this valve in accordance with local and national regula-
tions.
Failure to do so will result in discharge from the pressure relief valve directly into
the hydrobox and cause serious damage to the product.
All pipework used should be capable of withstanding discharge of hot water.
Relief valves should NOT be used for any other purpose, and their discharges
should terminate in a safe and appropriate manner in accordance with local regu-
lation requirements.
Note: Beware that the manometer and the pressure relief valve are NOT
strained on its capillary side and on its inlet side respectively.
If a pressure relief valve is added, it is essential that no check valve
or isolation valve is fitted between the hydrobox connection and the
added pressure relief valve (safety matter).
9
Minimum water quantity [L]
80
80
80
<Table 4.2.1>
<A>
Screws
<Figure 4.2.1>
Hydraulic Filter Work
Install a hydraulic filter or strainer (local supply) at the water intake ("Pipe E" in
Table 3.3, also see associated schematic Fig. 3.4)
Pipework Connections
Connections to the hydrobox should be made using the 28 mm compression as
appropriate. (see <Figure 4.3.1>) Use the included compression fittings. When
using the included compression fittings, after hand tighten the nut, tighten the joint
1 turn.
If necessary, tighten by another 1/4 of a turn.
Do not over-tighten compression fittings as this will lead to deformation of the olive
ring and potential leaks.
Note: To weld the pipes in the field, cool the pipes on the hydrobox using wet
towel etc.
Insulation of Pipework
• All exposed water pipework should be insulated to prevent unnecessary heat loss
and condensation. To prevent condensate entering the cylinder unit, the pipework
and connections at the top of the cylinder unit should be carefully insulated.
• Cold and hot water pipework should not be run close together where possible, to
avoid unwanted heat transfer.
• Pipework between outdoor heat pump unit and cylinder unit should be insulated
with suitable pipe insulation material with a thermal conductivity of ≤ 0.04 W/m.K.
Discharge to drain
(pipe MUST responsibly be fitted by installer).
Compression fitting
<Figure 4.3.1>
<B>
Screws
Hinges
Open
Factory-fitted pressure relief valve
(G1/2" female connection)
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