5.7 Steam Operating Filling
Open the system air vent and drain valve
gradually on the condensate drain.
Open the steam valve a small amount
until steam penetrates through the
condensate drain valve and air vent.
Close the condensate drain valve and air
vent, and open the steam valve fully.
Vent regularly during operations.
If the installation is occasionally on
standby, condensate must not be
allowed to remain in the pipes on
account of freezing and corrosion risk.
To prevent overheating coils, the fan
stop must be delayed by 3 to 5
minutes after the steam valve has
been closed.
5.8 Electric Heaters
Electric heaters are fitted with thermal
cutouts. These must be connected to the
control panel on site, to prevent
overheating of the unit. The fan is fitted
with an overrun for a period of 3 to 5
minutes.
5.9 Filters
Check that the filters are correctly fitted,
with the working side of the filter exposed
to the contaminated air stream. Refer to
the data sheets with regard to the
clean/dirty pressure drop readings.
Ensure that any pressure testing devices
are fitted correctly and that they are
zeroed to the right values (clean/dirty
pressure drops).
Over time, the liquid in the pressure-
testing device will fade.
16
5. Commissioning
Procedure
5.4 Unit Connections
All electrical, water, and ductwork
connections of the unit must be
completed by a qualified person.
To avoid damaging the coil
connections it is essential to grip the
hexagonal pipe connection whilst
applying counter pressure to tighten
the joint (see Figure 18).
Figure 18
Completely stress-free connections are
essential. The pipework of the coils
should be arranged to facilitate easy
removal of the coil for any required
maintenance purposes.
5.5 Coils
Check that the coil connections and
valves are not leaking. If there are leaks,
rectify the problem.
Cooling medium refrigerant Freon.
When direct condensers or air-cooled
condensers are fitted, the system
must be filled with refrigerant.
In this case a refrigerant engineer
must carry out the installation and
pipework.
5.6 Operating
In general, heating and cooling coils
should be filled with water containing
additives to protect against freezing and
corrosion:
Open the air vents.
Open the water supply valve a little so
that the heater battery fills slowly. This
avoids thermal stress.
As soon as the battery heater is full, close
the air vent.
Open the water valve fully and switch on
the fan.
Finally, the entire pipe system must be
completely vented.
All traps connected to the AHU drip trays
must be primed prior to operating the unit.
CAUTION
IMPORTANT
IMPORTANT
CLCH-SVX05A-GB
