5
ORIGINAL INSTRUCTIONS
VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: 08448 156060 Fax: 02380 261204 E-mail: [email protected] Web: www.ves.co.uk
Heat Recovery Unit
Installation, Operation and Maintenance Manual
®
Continued
A drain pan is fitted to all units. Should conditions mean that condensation is likely ensure
that the unit connected to an appropriate waste system. Refer to manual VES Ref. ID665 for
further information on trapping details.
Consideration should be given to the height required for the trap to function correctly and that
the unit may need additional base support in order to accommodate this correctly.
For EVX units 1 - 5 an optional peristaltic pump is available. For pump fitting and installation
instructions see the documentation accompanying the pump assembly.
The drain pan is fitted with an internal spigot suitable for connection with a push-fit straight
connector, to be supplied by others (EVX 1 - 5 Ø15 mm, 6 - 8 Ø22 mm). Terminate through the
case onsite as required, ensuring that any swarf is removed. Should it be required to remove
any component, ensure that it is replaced correctly.
Coils should be piped according to any relevant local codes of practice. Where threaded
connections are supplied, the only approved method of jointing method is by use of Boss white
and hemp. The thread fitted to the coil is to be supported at all times whilst making joints. All
external piping is to be supported independently from the coil. Fluid filters are recommended.
It is important that water and steam coils are protected against damage from extreme weather
conditions during the winter season. If the water is allowed to freeze in the coil system,
damage may occur potentially bursting pipes and resulting in emergency problems.
Fitting a frost thermostat at the unit inlet and ensuring that boilers run continuously in low
ambient temperatures can help to prevent this.
Heating coils do not cool immediately when the hot water supply is cut off. The residual heat
must be dissipated to avoid damage. The continuous running of the fan after shutdown
resolves this, by operation of a run-on timer.
The recommended length of run-on is
2 minutes minimum
.
On Ecovent®
EVX / -W
units, a Low Pressure Hot Water (LPHW) coil will be installed. The coils
are normally suitable for LPHW at 82°C flow and 71°C return temperature. LPHW coils are
supplied as standard with an air vent and drain plug located on the pipe work immediately
adjacent to the coil connections on the AHU. The air vent should be at the highest point, with
the drain at the lowest. The coil should be regularly vented so as to avoid potential air locks,
resulting in a fall off of duty.
It is recommended that a check be made as to whether any treatment is required to the water
supply for prevention of corrosion and scaling of the equipment. Information regarding the
necessary action to be taken can be obtained from the relevant Local Water Supply Authority.
The unit will have been supplied with connections either left or right-hand side looking in
direction of airflow. Please see order acknowledgement for confirmation of this handing.
Should you need to alter this please consult VES as unit adjustment may invalidate your
warranty.
Installation
4
Caution
Typical LPHW Coil
Fig.
Caution
Coils
LPHW Coils
Airflow
Flow
Return
Condensate Trapping
