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
Supply Unit
Installation, Operation and Maintenance Manual
6
ORIGINAL INSTRUCTIONS
®
Continued
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.
Installation
4
Coils
On
colourfan / -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.
Hot Water (LPHW) Coils
Caution
Unit Size 1-6 LPHW Coil
Configuration
Fig.
10
Unit Size 1-6 LPHW Coil
connection
Fig.
12
Airflow
Flow
Return
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
.
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.
Unit Sizes 1-6 will feature LPHW coil connection cover housings . To access during
installation
carefully remove the lid by unfastening the side catches around the casework.
Remove the side fixings to the coil cover and slide up and off. Holes have been provided in
the housing base for pipework entry. Please follow the appropriate manufacturers
instruction carefully when fitting a valve actuator. Ensure that the cover, lid and fixings are
replaced upon completion.
Return
LPHW coil
Housing cover
Housing base
Flow
Fixings
Flow
Return
12
11
10
Unit Size 7-9 LPHW Coil
Configuration
Fig.
11
