Application guidelines
83
FRCC.PC.023.A7.22
Manifold compressors
Installation and service
Handling
Compressor mounting
Tightening torques
Installation and service procedures for a parallel
system are similar to basic system installations.
The selection of additional system components
for parallel installations follows the basic system
common rules. Please refer to the Application
Guidelines for Danfoss SH scroll compressors
(FRCC.PC.007) for detailed installation and service
procedures.
Danfoss Commercial Compressors recommends
using the lift and handling devices, as shown in
picture beside, and that the following procedure
be used to prevent damage.
• Two lift rings are provided on each compressor.
Use all four rings.
• Maximum loads authorized per sling and for the
hoist hook must not be lower than the weight
of the assembly.
• The minimum spreader bar length must be at
least equal to the centre distance between the
two compressors to prevent bending the frame.
• When lifting, use a spreader block between the
compressors to prevent any unit frame damage.
• When the tandem unit is already mounted
into an installation, never lift the complete
installation by using the lift rings on the
compressors.
For VZH tandem systems, Danfoss supply both
rigid and rubber connections, but only rubber
connection is recommended by Danfoss. For
customers who prefer to configure compressor
lay out on their own, they could also get rigid
mounting components.
Regarding rubber connection, compressors
are mounted on the base with enough stiff by
grommets. To have enough stiffness, compressors
could be mounted on the rails then fix the rails to
a frame. Or compressors with rubber connection
could be mounted on the frame directly.
Spreader block
Spreader bar
Slings
Frame
Rubber connection
VZH compressors come delivered with four
rubber mounting grommets and metal sleeve
liners that serve to isolate the compressor
from the base frame. The grommets must
be compressed until contact between the
flat washer and the steel mounting sleeve is
established. The grommets attenuate to a great
extent the transmission of compressor vibrations
to the base frame.
0.59 inch
HM 8 bolt
Lock washer
Flat washer
Steel mounting
sleeve
Rubber grommet
Nut
The required bolt size for VZH170 hybrid
compressors is HM8-55 and must be tightened to
a torque of 21Nm.
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
1.10 inch
Compressor
base plate
The required bolt size for the VZH088 & 117
hybrid compressors is HM8-40. This bolt must be
tightened to a torque of 15 Nm.
Base plate, rails, etc. with enough rigidity
