8
C6.2.44/0219/E
3.1.4 Mounting parts
Four vibration absorber grommets are supplied with each compressor. They dampen the start-up
surge of the compressor and minimise sound and vibration transmission to the compressor base
during operation. The metal sleeve inside is a guide designed to hold the grommet in place. It is
not designed as a load-bearing member, and application of excessive torque to the bolts can crush
the sleeve. Its inner diameter is approximately 8.5 mm to fit, eg, an M8 screw. The mounting torque
should be 13 ± 1 Nm. It is critically important for the grommet not to be compressed.
If the compressors are mounted in tandem or used in parallel, then the hard mountings (bolt M8
5/16") are recommended. The mounting torque should be 27 ± 1 Nm.
Mounting parts ZRD*KRE
Soft mountings
Figure 4: Mounting parts
3.2 Solenoid valves for models ZRD*KRE compressors
IMPORTANT
The external solenoid valve is a critical component for proper operation of
these compressors.
Only
the Emerson brand solenoid valve supplied as a
requested accessory must be used.
Due to the high life-cycle requirements in a hot gas environment, a special valve has been
developed. A screen is provided in the digital solenoid valve to prevent debris from disrupting valve
operation.
For reliability requirements, only Emerson-approved solenoid valves may be used for this
application. All compressor warranties are null and void if the Emerson-approved valve is not used.
For digital solenoid valve and complete tubing kits reference, see Emerson spare parts software
available at
Care must be taken during the brazing process that no solid parts can enter the control piston
compartment or the solenoid valve tubing. To prevent solid parts from entering the control valve
seat, the solenoid valve kit contains a filter screen.
The solenoid valve has to be fitted in such a way that the sleeve with the stem inside
– which
supports the solenoid coil
– is fixed and aligned in the upright position.
In case of compressor exchange, Emerson recommends replacing the high cycle digital solenoid
valve and coil at the same time.
For any defect around the digital solenoid valve, it is always good practise to exchange both the
solenoid valve and the coil.
Figure 5: Position of external solenoid valve without and with sound shell
