REMEHA 1000 Indirect, Installation Manual

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Figure 9: Installation schematic
page 12
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The location of the expansion vessel should allow access to recharge the pressure as and when necessary.
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A suitable draining tap should be installed in the cold water supply to the cylinder between the expansion valve and the heater at as low a
level as possible.
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It is recommended that the outlet point of the drain pipework be at least 1 metre below the level of the heater (this can be achieved by
attaching a hose to the drain tap outlet spigot).
Cold water control pack
CAUTION
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The expansion vessel pressure must be set in accordance with the inlet pressure set on the pressure reducing valve.
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Flush supply pipework before connection to remove all flux and debris prior to fitting the inlet controls.
Failure to do this may result in irreparable damage to the controls and will invalidate any warranty.
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The cold water control pack can be connected anywhere on the cold water cylinder supply prior to the expansion vessel.
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The control pack incorporates the strainer, check valve, core unit and expansion relief valve.
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The pressure settings are adjustable and should be set between 1.5 & 6 bar.
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The valve can be fitted in any orientation to suit the installation as long as the valve is installed with the direction of flow arrows pointing
in the correct direction.
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The expansion relief valve should be installed with the discharge pipework in either the horizontal position or facing downwards.
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No other valves should be placed between the cold water combination valve and the cylinder.
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The blank plastic plugs in the body of the pressure relief valve are pressure gauge connections to enable pressure monitoring to be carried
out, should the system develop a fault. It is recommended that these be accessible (the pressure reducing valve has two - only one need be
accessible).
Primary circuit control
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The 2 port motorised valve supplied with the cylinder MUST be fitted on the primary flow to the cylinder heat exchanger and wired such
that in the event of the cylinder overheating it will close the primary circuit.
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Primary circulation to the cylinder heat exchanger must be pumped; gravity circulation WILL NOT WORK.
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It is recommended that an air bleed or automatic air vent is incorporated in the primary return pipe work close to the unit.
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Boiler flow temperature should be set to 82° (maximum flow temperature to primary heat exchanger 89°C).