Reception & Storage; Installation - SPC DERV Installation, Operating And Maintenance Instructions

3 Reception & storage
DERV units are delivered in purpose made cardboard containers, if ordered as a DX version with
outdoor unit then this will be packaged separately. Upon receipt of the units the packaging should
be checked for any obvious damage and the labeling checked against the project requirement.
Any damage or delivery discrepancy should be reported to the SPC local office immediately. After
checking the packaging the units should be removed and a visual inspection carried out and any
damage reported immediately. If the units are not to be installed immediately then they should be
returned to the packaging for storage.
It is recommended that the units be stored in a safe location away from site activity and they must
not be exposed to the ambient. Units must be stored in non-condensing atmospheres where
temperatures cannot exceed 50° C.

4 Installation

4.1 Mounting of Indoor Unit
DERV and DERVDX indoor units must be installed horizontally and are intended to be fitted in a
concealed location, ideally above a false ceiling. The units must be suspended from the concrete
ceiling slab or other fixed and firm horizontal steelwork. Care must be taken to ensure that the
DERV(DX) unit is fixed to a structure that will accept the unit weight as shown in the above table
and that vibrations are not transmitted.
DERV(DX) units are supplied with 4-off robust fixing lugs at each of the corners of the unit (6-off
on the size 500). Each of these lugs incorporates a rubber bush to prevent unit vibrations being
directly transmitted to the mounting/support rods. The units should be mounted from the
ceiling/steelwork using threaded drop-rods. These drop-rods are not supplied with the units but
we recommend the use of M8 threaded rod.
The ceiling or support structure should first be marked out to match the position of the holes in
the DERV(DX) unit fixing lugs. The structure should then be drilled and fitted with suitable
anchors capable of accepting the weight of the DERV(DX) unit. Brackets can then be secured to
the ceiling anchors for securing the threaded drop rods. The rods should be cut to length and
secured to the ceiling bracket or supporting steelwork and the other end passed through the fixing
lugs on the DERV(DX) unit.
The drop-rods should be secured with suitable nuts on either side of the fixing lugs around the
anti-vibration bushes. It is important that the unit is fitted level in both directions so that correct
operation and drainage are ensured. A maximum deviation of 3mm from the horizontal should be
maintained and checked on installation using a spirit level and adjusted using the retaining nuts
on the fixing lugs.
4.2 Mounting/Location of Outdoor Unit (DERVDX only)
Outdoor units supplied with DERVDX are suitable for floor mounting and are side discharge
models. It is important that there is no obstruction on the air inlet and outlet sides of the unit and
that there is no possibility of hot discharge air being drawn back into the inlet.
QA/IOM/63 ISSUE 2 - DERV Page 6 of 19