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4
Installation
4.3 Water Pipe Work
Hot Water Pipework
The cylinder unit is UNVENTED. When installing unvented hot water sys-
tems, building regulations part G3 (England and Wales), P3 (Scotland) and
P5 (Northern Ireland) should be adhered to. If outside of the UK, please ad-
here to your own country's regulations for unvented hot water systems.
Connect the flow for the DHW to pipe A (Figure 3.1).
The function of the following safety components of the cylinder unit should be
checked on installation for any abnormalities;
• Pressure relief valve (primary circuit and tank)
• 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.
Cold Water Pipework
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Cold water to the suitable standard (see section 4.2) should be introduced to the
system by connecting pipe B (Figure 3.1) using appropriate fittings.
Primary Pump Circulation
If there are thermostatic or motorized valves on the installation, at least one of the
valves on each zone must remain open to enable routine water circulation.
(preferably on the largest or furthest emitter).
Drain Pipework (ONLY ER series)
The drain should be set from the drain socket at left rear of the unit.
The drain pipe should be installed to drain condensed water during cooling mode.
Close the drain socket hole when cooling operation is not used.
• To prevent dirty water from draining directly onto the floor next to cylinder unit,
please connect appropriate discharge pipework from the cylinder drain pan.
• Securely install the drain pipe to prevent leakage from the connection.
• Securely insulate the drain pipe to prevent water dripping from the locally
supplied drain pipe.
• Install the drain pipe at a down slope of 1/100 or more.
• Do not place the drain pipe in drain channel where sulphuric gas exists.
• After installation, check that the drain pipe drains water properly from the outlet of
the pipe to suitable discharge location.
• The drain hose should be connected to the drainage hole that is in the room.
Drain hose
11
Negative pressure prevention
To prevent negative pressure effecting DHW tank, installer should install appropriate
pipework or use appropriate devices.
Hydraulic filter work (ONLY E*PT series)
Install a hydraulic filter or strainer (local supply) at the water intake ("Pipe E" in
Fig.3.1)
Pipework Connections
Connections to the cylinder unit should be made using the G-screw connection.
Note: Before brazing pipes in the field, protect pipes on the cylinder unit using
wet towels, etc. as "heat shield".
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.
<Installation>
1. The drain socket (inside diameter 26 mm) is left rear of the cylinder unit. (Figure
4.3.1)
2. Fix the drain pipe (VP-20) which fits the drain socket with the polyvinyl chloride
type adhesive.
3. Set the drain pipework up to the outlet with the down grade of more than one
hundredth.
Note: Securely support the locally supplied drain pipe to avoid the drain pipe falling
from the drain socket.
Drain socket
<Figure 4.3.1>
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