14
ORIGINAL INSTRUCTIONS
VES Andover Ltd Eagle Close Chandlers Ford Ind. Est. Eastleigh Hampshire SO53 4NF
Tel: 023 8046 1150 Fax: 023 8026 1204 E-mail: [email protected] Web: www.ves.co.uk
EVHR Hybrid Ventilation Unit
Installation, Operation and Maintenance Manual
Standard Wiring
& Fan Installation
5
Continued
For each room an information and override panel is provided to allow the user to
override the automatic controls.
The panel comprises:
•
Boost/Pause switch (retractive)
•
Boost/System Healthy active indication (orange)
•
Open windows indication (green)
•
+/- 2 °C Temperature trim switch (retractive) [EPEL2008 only]
Operation of the Boost switch will run the unit to maximum set speed and modulate the
dampers to allow maximum amount of fresh air possible without affecting room
temperature. If the unit is off, operation of the Boost switch will start the system in
boost mode. The system will revert to automatic operation after a preset period or if the
switch is operated again. A time delay will prevent rapid mode switching by
unauthorised operatives. The Boost/System Healthy indication will illuminate with an
asymmetric pulse.
Operation of the Pause switch will pause the system. The system will revert to automatic
operation after a preset period or if the switch is operated again. A time delay will
prevent rapid mode switching by unauthorised operatives. The Boost/System Healthy
indication will stop illuminating until the unit resumes normal operation.
The Open windows indication shall illuminate when the external temperature reaches a
suitable level to encourage manual window opening. The preset temperature for
indication shall be set through the BMS at 15° C such that should the windows be
opened, there will never be a temperature differential of more than 5° C between room
design temperature and incoming fresh air.
An optional secondary condition can be activated to enable the window open indication
if the CO
2
level in the classroom reaches 1500 ppm. In this case, the window open
indication will be illuminated.
EPEL2008 has the same functionality and characteristics as the above with the addition
of the +/-2°C Temperature trim switch, which provides user override of room design
temperature by +2°C or -2°C. This is limited to 2°C either side of the setpoint, the system
will revert to automatic operation after a preset period.
For details regarding older switchplate designs or special versions please contact VES
Customer Services on
08448 15 60 60 for further information
The system healthy indicator will illuminate when the unit is operational. In the event of
a system failure, the indicator will be off and the buttons will be unresponsive e.g
pressing the boost button results in no boost indication. Should this situation arise the
system should be checked for a possible fault.
Standard Controls
arrangement
Override Panel
Fig.
19
EPEL2008
Override Panel c/w temperature trim
EPEL2009
Override Panel (no trim)
Important
