Instruction Manual

- After replacement, ensure that all gaskets are
changed (new gaskets tted) and that the inlet and
outlet connections to the coil are made correctly
using an appropriate sealing compound applied
to the valve body. Bleed all air from the coil during
relling.
WARNING: Take care when tightening the valve
body to the coils (15 Nm is sucient) to ensure they
are not damaged.
CAUTION: Coil inlet/outlet and cooling/heating side
positions
Water inlets/outlets, all sizes: Fig. 14.
WARNING: Carefully observe the direction indicated
by the arrow on the valves, based on the valve type.
4.5 - Spigots Duct connection
These are manufactured from aluminium sheet metal.
They are encased inside the unit. The ducts should be
xed to these spigots using circular collars or adhesive.
Screws and rivets should not be used.
WARNING: In order to guarantee good air tightness,
the duct should overlap the whole of the spigot.
Make sure that the maximum supply air temperature
does not exceed 60°C.
Do not lift or support the unit using the spigots, place
loads on the spigots during installation or operation.
4.6 - Rectangular anges duct
connection
When connecting rectangular anges to the inlet and
the outlet make sure that the duct is pushed closely the
unit.
4.7 - Optional lter and lter access
4.7.1 - Description
The Carrier unit is tted with G3 lter as standard. The
G3 lter is compliant to M1 re rating (according to NFP
92-507 standard).
4.7.2 - Air lter replacement
Air lters should be changed regularly. Filter life depends
on the rate at which the lter becomes clogged, which
depends upon the cleanliness of the working
environment.
If clogged lters are not changed they can increase the
air pressure drop, trapped dust particles may be given
off and entrained in the air supply, and the general
performance of the unit may be degraded (as the air
ow reduces).
- Remove the lter access door in case of units with
inlet plenums and take out the lter.
- Remove the lter directly in case of no plenum
NOTE: When installing a unit in a ceiling/oor void,
check that no T-bars will obstruct lter access and
removal.
4.8 - Fresh air controller
4.8.1 - Fresh air controller with (adjustable)
constant air volume
The unit can be tted with three ranges of constant and
adjustable fresh air ow. The 3 ranges are 15 to 50 m
3
/h,
50 to 100 m
3
/h and 100 to 180 m
3
/h.
The diameter of the spigot housing the fresh air ow
controller is 125 mm. The fresh air controller can be
modied on site by unscrewing and repositioning the
damper of the controller. See g 17.
IMPORTANT: If the unit is tted with a return air
temperature sensor, the constant fresh air ow rate
must not exceed 50% of the supply air ow delivered
by the unit at minimum speed.
NOTE: To operate correctly the constant fresh air
ow controller requires a differential pressure in
the range of 60 Pa to 210 Pa.
4.8.2 - Fresh air controller with variable air
volume
The unit can be equipped with a variable fresh air ow
controller from 0 to 55 l/s (0 to 200 m
3
/h).
This is connected to the numeric Carrier controller and
can regulate the fresh air intake in using a xed rate set
by the installer that can be recongured as required.
NOTE: With the variable fresh air ow controller the
upstream pressure in the fresh air duct must be 180
Pa. It is available as an accessory.
4.8.3 - Fresh air ltration
If the unit is provided without any lter or in the return
plenum, it is the responsibility of the installer to check
if the fresh air is ltered beforehand.
4.9 - Optional water ow control valves
These valves are either two-way or four-way type (three-
way with integral bypass). The body of the valve is
designed to withstand a 15,5 bar (1550 kPa) bar
operating pressure.
With this option, the couple (valve + actuator) is usually
normally closed (NC).Thus, the water ow is null in case
of power cut. To ll the installation, to equalize the water
circuits and to purge the units, the actuators must be
connected to the power supply and the valves must be
opened via the controller (thermostats or BMS).
For the replacement of these components refer to the
chapter 4.9.4.
4 - COMPONENTS AND MAINTENANCE
18