9
Air Handling Units
Connection of Heat Exchangers
Water and Glycol Heat Exchangers
The heat exchangers can be delivered in versions to be
connected:
a) through the fixed side panel of the air-handling unit
b) into the inner cross-section:
Figure 16 –
Heating and cooling media feed
The corresponding connection points are marked with
labels on the unit side panel (heating water inlet, heating
water outlet, coolant inlet, coolant outlet).
The connection diameter corresponds with the heat
exchanger and given type parameters, and it is specified in
the air-handling unit documentation. Available dimensions
are from G1" to G3".
The headers are equipped with G3/8" necks for the air-
venting valve in the upper part of the heat exchanger;
these necks also enable an antifreeze protection sensor to
be installed (on the exchanger outlet header) or the heat
exchanger to be drained.
Figure 17 –
Anti-freeeze protection sensor
Connection of Water Heat Exchangers
The counter-current connection of the heat exchangers
is necessary to achieve maximum output. When con-
necting the feeding fittings to the heat exchangers, use two
wrenches to tighten the screws to avoid wresting of the
exchanger's headers.
After connecting the water heat exchangers (heaters and
coolers, including mixing sets) to the distribution piping,
it is necessary to pressurize (fill with water) and vent the
entire circuit, including the heat exchanger, and then to
perform leak-tightness checks of all pipe joints and of the
exchanger itself (including inspection of the water exchan-
ger block interior).
The manufacturer does not provide any guarantee
covering any damage resulting from liquid leakage from
leaky joints or damaged exchangers.
Figure 18 –
Heat exchanger connection
Figure 19 –
Glycol circuit connection
Figure 20 –
Connection of evaporators
Direct Evaporators
Direct evaporators must be connected by a specialized
contractor authorized to install refrigerating equipment.
The direct evaporators can be delivered in versions to be
connected through the fixed side panel of the air-handling
unit or into the inner cross-section.
The direct evaporators are filled with nitrogen in the facto
-
ry. They can be delivered in single or multiple-circuit versi-
ons.
NECKS for installation of the antifreeze pro-
tection sensor and air-venting valve
Air flow direction
(cooler right-hand
version)
Air flow direction
(cooler
right-hand
version)
Inlet
Outlet
Inlet
Outlet
Glycol cooler
Glycol heater
1) Circulation pump
2) Air-venting valve
3) Inlet/outlet valve
4) Safety valve
5) Expansion tank
6) Pressure gauge
3
1
3
2
4
5
6
2
Double-circuit evaporator
Double-circuit evaporator
inlet
outlet
Single-circuit evaporator
inlet
outlet
Single-circuit evaporator
1
2
1
2
1
2
1
2
Air flow direction
(cooler right-hand
version)
Air flow direction
(cooler right-hand
version)
Air flow direction
(cooler right-hand
version)
Air flow direction
(cooler right-hand
version)
