Water Pipe Work - Mitsubishi Electric ecodan ERST20 series Installationshandbuch

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 adhere 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 do not enter the pipe.
Cold Water Pipework
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.
drain Pipework (Only erSt20* series)
To drain correctly, it is necessary to use optional part ʻDrain pan stand (PAC-DP01-E)ʼ
The drain pan and drain pipe should be installed to drain condensed water during
cooling mode.
• 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 sulfuric gas exists.
• After installation, check that the drain pipe drains water properly from the outlet of
the pipe to suitable discharge location.
Tie band
13
Drain hose
Locally supplied
drain pipe (VP-20)
Drain socket
Apply polyvinyl
chloride type adhesive
negative pressure prevention
To prevent negative pressure effecting DHW tank, installer should install appropriate
pipework or use appropriate devices.
Hydraulic filter work (Only eHPt 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 22 mm or 28 mm
compression as appropriate.
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 cylinder unit 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.
<Installation>
note: it may be more convenient to fit the drain hose prior to positioning the
cylinder unit upon the stand.
1. Insert the drain socket deeply into the drain hose. (Figure 4.3.1)
2. Fix the drain hose with the tie band.
3. Apply polyvinyl chloride type adhesive over the shaded surfaces inside of the
drain pipe and on the exterior of the drain socket as shown.
4. Insert the drain socket deeply into the drain pipe. (Figure 4.3.1)
Note: Securely support the locally supplied drain pipe to avoid the drain pipe falling
from the drain socket.
<Checking drainage>
• Remove the front panel and gradually pour 1 liter of water into the drain pan.
(Figure 4.3.2)
• Check that the drain pipe drains water properly from the outlet of the pipe.
• Check for any leakage from the connections.
Note: 1. Always check drainage at installation regardless of season.
2. Pour water slowly into the drain pan so that water dose not overflow from
the drain pan.
<Figure 4.3.1>
<Figure 4.3.2>
Drain pan stand
(Optional part: PAC-DP01-E)