AL-KO AT4F Series, Operating And Assembly Instruction Manual

Page: 68 / 140

Translation of original operating instructions
68
AL-KO AT4F ATEX
5.8.5 Circulating coil system CCS (recuperative energy recovery)
EHA ETA ODA SUP
Fig. 50 Schematic diagram of a circulating coil system
With heat exchangers in a circulating coil system, the pipe circuits themselves cannot be emptied.
For this reason, the circulating coil system is only to be operated with a frost-proof water/glycol mixture and tested for
leak-tightness after assembly.
If the system does have to be drained, the pipe circuits can be blown out with compressed air, although water still re-
mains in the heat exchanger even in this case.
ATTENTION
When using high-performance circulating coil systems, observe the manufacturer's operating
instructions.
ATTENTION
During commissioning, observe chapter "5.9.4 Filling and venting" on page 73.
Step Action
1 Connect the heat exchanger using the counterflow principle (water flow direction opposite the air flow direction in the
unit).
2 Connect the pre flow up or down depending on the air direction.
3 Carefully vent the heat exchanger.
4 Check all of the piping for leaks.
5 Ensure that the piping and the heat exchanger are integrated into the unit potential.
„
Piping must be provided on-site.
„
Circulating pump must be dimensioned according to the technical data sheet.
„
Heat exchangers must be connected in the counterflow principle.
„
Antifreeze concentration must correspond to the specifications on the technical data sheet.
„
The pre flow is at the top or bottom, depending on the air direction.
„
We recommend the use of the antifrogen N with a mixture of 25 – 35 %.