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General Outline ESIE10-01

1–98 Part 1 – System Outline

Controlling the

partial recovery

circuit and

installation

recommendations

The partial heat recovery system is not managed and/or controlled by the machine. The installer

should follow the suggestions below for best system performance and reliability:

1. Install a mechanical filter on the heat exchanger inlet pipe.

2. Install shut-off valves to isolate the heat exchanger from the water system during periods of inac-

tivity or system maintenance.

3. Install a drain valve that allows the heat exchanger to be emptied in the event that air temperature

is expected to fall below 0°C during periods of machine inactivity.

4. Install flexible anti-vibration joints on the heat recovery water inlet and outlet piping, so that trans-

mission of vibrations, and therefore noise, to the water system is kept as low as possible.

5. Do not load exchanger joints with the weight of the heat recovery piping. The water joints of the

exchangers are not designed to support the weight.

6. Should heat recovery water temperature be lower than ambient temperature, it is advised to

switch off the heat recovery water pump 3 minutes after having switched off the last compressor.

Important: Partial heat recovery, which exploits the post-overheating cooling of the delivery gas, is

designed as a source to integrate an external heating source. Recovery availability is only guaranteed

with the refrigerating circuit operating upon request of the refrigerated water circuit. Specifically, it is

not suitable for operation with exchanger water inlet temperatures of below 40°C for periods in excess

of normal system operation (approx. 30 minutes). Prolonged operation in these conditions can lead to

malfunctions of the refrigerating circuit and the intervention of the protective devices. The installer

must ensure that the recovery circuit water reaches the minimum value admitted as quickly as

possible. This is also why the lack of water flow must be ensured in the exchanger when the

refrigerating circuit is not running.