D – 508 C – 07/02 D – EN pag. 28/36
Heat Recovery Microprocessor Set-up
The units supplied with heat recovery condensers are equipped with an additional microprocessor (TC10, see
electrical wiring diagram) for hot water temperature control, featuring two, three or four control stages depending
on the number of heat exchangers installed on the unit (one stage per compressor). For information on how to set
this microprocessor see the Specific manual supplied with the unit.
The most important set-up values are given below. Please see the microprocessor manual for further details.
ITEM
Description
Setpoint
St1
Inlet water temperature set point
Max 50
St2
N/A
CO
Operating Mode
1
P1
Differential Set point
2
P2
N/A
C4
Authority
0.5
C5
1
C6
0
C7
3
C8
5
C9
0
C10
0
C11
0
C12
20”
C13
1
C14
0
C15
0
C16
100
C17
5
C18
0
C19
0
C21
30
C22
43
C23
N/A
C24
N/A
P25
8
P26
55
P27
2
P28
20
C29
4
C30
N/A
C31
0
C32
1
C33
0
C50
4
C51
0
System Maintenance
General
To ensure proper operation at peak capacity and to avoid damage to system components, a periodic inspections
program should be set up and followed. The information given below is intended as a guide to be used during
inspection and must be combined with observation of compressor sound and good electrical practices to ensure
trouble-free performance. The sight-glass indicator in the liquid line of every circuit must be checked to verify the
glass is full and clear. If the indicator shows a wet condition and/or there are bubbles in the sight-glass, even when
the system has a full refrigerant charge, the filter-dryer element must be changed.
Compressor maintenance
The screw compressor does not required frequent maintenance. However a vibration test is an excellent check for
proper mechanical operation. Compressor vibration indicates that maintenance is required as it adversely affects
