8
PGK
GB
Installation
The PGK duct cooler is designed for using chilled water as the
cooling medium. The duct cooler coil consists of copper tu-
bes and aluminium fins. The cooling coil must not be used for
direct-expansion refrigerant.
The air flow, water flow and other technical particulars are given
in the capacity tables.
The cooler should not be installed close to a fan outlet or a duct
bend, since the air flow across the coil would then be uneven
and the cooling capacity would thus be impaired.
The cooler must be installed so that the finned coil, drip tray
and condensate outlet are accessible for cleaning (see also under
the heading cleaning).
The duct cooler should be installed in a horizontal duct, but the
air flow may be in either direction.
The duct cooler should be secured to the duct system by means
of screws or slip joints.
The condensate outlet (C in Figure 1) should be connected
across a water trap in order to avoid air leakage. N.B. The size
of the outlet should be such that no water will remain in the
drip tray. When the drip tray is to be removed, ensure that the
condensate outlet is easy to disconnect.
An efficient filter is recommended in the system in order to
reduce fouling and thus also cut down the need for maintenance
(see also under the heading cleaning).
The duct cooler should be installed downstream of the fan unit,
although it can also be installed upstream, but care should then
be taken to ensure that the fan motor and other components will
not be harmed by the humid air downstream of the cooler.
The duct cooler must be insulated on the outside, so that no
condensate will form. The ducts that carry the chilled air must
normally also be insulated.
Water connections
Operating data: Max. operating temperature/operating pressure
100°C/1.0 MPa (10 bar)
The following must be taken into account when connecting the
duct cooler to the pipe system.
1. The pipes connected to the cooler must not be subjected to
twisting or bending loads. Use tools to restrain the pipes
when tightening the coupling nuts.
2. Ensure that expansion forces in the system or the deadweight
of the pipe system are not applied to the connections on the
cooler.
3. The water inlet must be connected to the lower pipe
(marked Inlet in Figure 1) and the outlet to the upper pipe
(marked Outlet in Figure 1). The inlet is provided with a
drain connection (A in Figure 1) and the outlet with an air
purging connection (B in Figure 1).
4. After the system has been filled with water, check the duct
cooler and its connections to ensure that there is no water
leakage. Any leakage could cause water damage.
5. The cooling coil can be drained of water through the drain
connection (marked A in Figure 1).
CAUTION: If the water in the coil should freeze, the coil may
burst which would allow water to run out of the system, and
this could cause water damage. When the duct cooler is not in
service and there is risk of freezing, the cooler should be drained
of water through the drain connection and blown with compres-
sed air to ensure that all water has been drained.
Figure 1
B
A
C
Outlet
Inlet
