INSTALLATION AND SERVICE
System cleanliness
Compressor handling,
mounting and
connection to the system
Compressor handling
Compressor mounting
Designation
Recommended torque
in. lb
Cable screw of T connector
in electrical box
screw 10/32 - UNF x 3
17
Rotolock valves and solder sleeves
1"
59
1"1/4
66
1"3/4
81
Mounting grommet bolts
1 - 2 - 4 cylinder
11
Oil sight glass
-
37
Oil equalization connection
1 - 2 - 4 cylinder
22
Compressor connection
to the system
System contamination is one of the
main factors affecting equipment relia-
bility and compressor service life.
It is, therefore, important to ensure sys-
tem cleanliness when constructing a re-
frigeration system. During the building
process, system contamination can be
caused by:
• Brazing and welding oxides
• Filings and particles from
removing burrs from pipe-work
• Brazing flux
• Moisture and air.
Only use clean and dehydrated refri-
geration grade copper tubes and silver
alloy brazing material. Clean all parts
before brazing and always purge nitro-
gen or CO
2
through the pipes during
brazing to prevent oxidation. If flux is
used, take every precaution to prevent
it entering the piping. Do not drill holes
(e.g. for Schräder valves).
in parts of the installation that are alrea-
dy completed, when filings and burrs
can not be removed. Carefully follow the
instructions below regarding brazing,
mounting, leak detection, pressure test
and moisture removal. All installation
and service work must be done only
by qualified personnel using correct
procedures and using tools (charging
systems, tubes, vacuum pump, etc.) de-
dicated for the refrigerant that will be
used.
Maneurop® MT and MTZ compressors
are provided with a lifting lug. This lug
should always be used to lift the com-
pressor. Once the compressor is instal-
led, the compressor lifting lug should
never be used to lift the complete ins-
tallation.
Keep the compressor in an upright posi-
tion during handling.
Mount the compressor on a horizontal
plane with a maximum slope of 3
o
. All
MT and MTZ compressors are supplied
with three or four rubber mounting
grommets, each complete with metal
sleeves, nuts, and bolts. Refer to the
outline drawings on page 18 to 21.
The grommets largely attenuate com-
pressor vibration transmitted to the base
frame. The compressor must always be
mounted with these grommets. Refer to
the table below for torque values.
New compressors have a protective ni-
trogen holding charge. The suction and
discharge caps should only be removed
just before connecting the compressor
to the installation to avoid air and mois-
ture entering the compressor.
Whenever possible the compressor
must be the last component to be
integrated in the system. It is advisa-
ble to braze the solder sleeves or ser-
vice valves to the pipework before the
compressor is mounted. When all bra-
zing is finished and when the entire