Rev. F 02-2021
35
ØSC
ØDC
ØL
MC
FL
EXV
EV
M
MFC
M
MFC
BAW
CND
1
CHR
CH
1
SHP
1
CHR
ØH
ØH
VMA
C
A
B
CH
1
SLP
Ø6
#
DSP
*
*
*
Ø6
Ø6
ØH
ØH
SV
BAW
FL
CH
MC
CHR
MFC
CND
SHP
DSP
SLP
EV
SV
EXV
VMA
MTEC.6500.GB-F-1 Operation and maintenance manual SDA series English
SDA
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Water coil
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Charging plug 1/4 sae
Compressor
Charging plug 5/16 sae
Centrifugal fan
Condenser
High pressure pressostat
Desuperheater
Low-high pressure switch
Evaporator
Shut off valve
Termostatic valve
Water modulating valve
4.23 Basic
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5. UNIT START UP
5.1 Preliminary checks
Start-up operations must be performed in accordance with the instructions detailed in the previous paragraphs.
Do not modify internal wiring of the unit as this will immediately invalidate the warranty.
• Verify that the unit is installed in a workmanlike manner and in accordance with the guidelines in this manual.
•
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• The operating voltage the one shown on the unit labels.
• Check that the unit is connected to the system earth.
• Check that there is no refrigerant leakage.
• Check for oil stains, sign of a possible leak.
• Check that the refrigerant circuit shows the correct standing pressure on the pressure gauges (if present) otherwise use external ones.
• Check that the Shrader port caps are the correct type and are tightly closed.
• Check that crankcase heaters are powered correctly (if present).
• Check that all water connections are properly installed and all indications on unit labels are observed.
•
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• Check that the water temperatures are within the operation limits reported in the manual.
• Before start up check that all panels are replaced in the proper position and locked with fastening screws.
Before starting the unit the checks detailed in this manual of the electric supply and connections, the hydraulic system and the refrigerant
circuit, should be performed.
5.1.1 Before start-up
Damage can occur during shipment or installation. It is recommended that a detailed check is made, before the
installation of the unit, for possible refrigerant leakages caused by breakage of capillaries, pressure switch con-
nections, tampering of the refrigerant pipework, vibration during transport or general abuse suffered by the unit.
The cooling circuit principle diagram is purely indicative.