Hydraulic Connection; Expansion Vessels; Flow Switch; Flexi Hoses - ESP Varimax I ASHP Installation And Operation Manual

points within the system and at any place within the pipework
that may be likely to hold air blocks. Manual air vents should
be fitted at the highest point on the pipework between the
unit and the buffer tank and at any point that presents air lock
potential.

It is highly recommended that a suitably sized buffer
tank be installed between the unit and the heating
distribution system. Please consult your installer or ESP when
considering this system design point – the right sized buffer
tank can make a significant difference to the economy and
efficiency of the unit and the heating effectiveness.

6.0 Hydraulic Connection

6.1. Expansion vessels.

An expansion vessel must be installed where the heating system is
unvented. The size of the vessel(s) must be t=determined by the installer
on site and take into account the entire volume of water/glycol mix being
heated including the volumes contained in the Unit, the buffer tank, the
distribution system, emitters and any other system connected to the unit..

6.2 Flow Switch

The unit is fitted with a water flow switch that will pause the unit
operation if water flow is not continuous (this includes where there is air
in the system). The flow switch is there to protect the unit and the
setting should not be altered. If the flow of water is insufficient, an
error code of "Flow Level" will be displayed on the controller. This will
occur on initial start-up if the installer has failed to purge all the air from
the system.

6.3 . Flexi Hoses

The final connection to the heat pump flow and return must be made with
suitable flexible pipes to prevent vibration in to the system pipework.
Please ensure that two wrenches are employed to take up the torque
created in tightening the fittings to avoid damage to both the fittings and
the heat pump.
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