Shut-Off Valves And Adaptors - Emerson Copeland Scroll ZRH49K Series Application Manuallines

IMPORTANT
Contamination or moisture! Bearing failure! Do not remove the plugs until
the compressor is set into the unit. This minimises any entry of contaminants
and moisture.
Figure 7: Suction tube brazing
▪
The copper-coated steel tubes on scroll compressors can be brazed in approximately the same
manner as any copper tube.
▪
Recommended brazing materials: any silfos material is recommended, preferably with a
minimum of 5% silver. However, 0% silver is acceptable.
▪
Be sure tube fitting inner diameter and tube outer diameter are clean prior to assembly.
▪
Using a double-tipped torch, apply heat in area 1.
▪
As the tube approaches brazing temperature, move the torch flame to area 2.
▪
Heat area 2 until braze temperature is attained, moving the torch up and down and rotating
around the tube as necessary to heat the tube evenly. Add braze material to the joint while
moving the torch around the joint to flow braze material around the circumference.
▪
After the braze material flows around the joint, move the torch to heat area 3. This will draw the
braze material down into the joint. The time spent heating area 3 should be minimal.
▪
As with any brazed joint, overheating may be detrimental to the final result.
To disconnect:
▪
Heat joint areas 2 and 3 slowly and uniformly until the braze material softens and the tube can
be pulled out of the fitting.
To reconnect:
▪
Recommended brazing materials: Silfos with minimum 5% silver or silver braze used on other
compressors. Due to the different thermal properties of steel and copper, brazing procedures
may have to be changed from those commonly used.
NOTE: Since the discharge stub contains a check valve, care must be taken not to overheat
it to prevent brazing material from flowing into it.
3.3

Shut-off valves and adaptors

CAUTION
Leaking system! System breakdown! It is strongly recommended to
periodically re-torque all pipe and fixing connections to the original setting after
the system has been put into operation.
Copeland Scroll horizontal compressors are delivered either with stub or Rotalock connections
depending on the bill of material that has been selected.
Braze connections can be converted to Rotalock by means of adaptors. Rotalock shut-off valves are
available for the suction as well as discharge sides. Using either straight or angled adaptors provides
a way to convert a Rotalock into a brazing connection.
Refer to Table 3 for proper tightening torques:
Connection
Rotalock 1" – 14 UNS
Rotalock 1 ¼" – 12 UNF
Rotalock 1 ¾" – 12 UNF
Table 4
NOTE: More information about adaptors and shut-off valves can be found in the "Spare parts
list" available at www.climate.emerson.com/en-gb.
C6.2.7/1007-0619/E
Copeland Scroll compressors have copper-plated steel
suction and discharge tubes. These tubes are far more
robust and less prone to leaks than copper tubes. Due
to the different thermal properties of steel and copper,
brazing procedures may have to be changed from those
commonly used.
Refer to Figure 7 and the procedure below for the
brazing of the suction and discharge lines to a scroll
compressor.
Torque [Nm]
70 - 80
110 - 135
135 - 160
9