Operating manual – DualPAC with reciprocating compressors
0012201 en 2021.04
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4. Installation information
4.1
Installation
4.1.1
General information
For assistance or information about installation, please contact your local Johnson Controls
product representative.
4.1.2
First start-up procedure
Installation in terms of mechanical work (refrigeration system and piping), electrical work and in-
stallation of safety equipment must be performed in accordance with local codes/rules and/or ac-
cording to EN 378-3 and EN 378-4 as a minimum requirement.
The pressure loss in the downstream line from the safety valve must meet the values stated in EN
13136 to which EN 378 is referring. The data necessary to dimension the line in accordance with
this standard is stated in the data sheet for the specific unit on the first page of this manual.
Make sure that all necessary documents are available, including declarations, certificates, identi-
fication plates, manuals, machine card, logbooks and/or other documentation required according
to local rules and/or EN 378.
The main issues/check points for installation of the DualPAC unit are as follows:
1.
Lifting the unit. Only use the lifting lugs marked with red.
2.
Place the unit with sufficient free space for operation and maintenance in accordance with
GA-drawing.
3.
Place the unit on a foundation suitable for the actual load and vibrations. With or without
vibration dampers according to the vibration design strategy.
4.
Connect all piping. The piping design must include considerations regarding function, sus-
pension, vibrations, thermal expansion and pre-stress after welding in order to avoid high
load on the DualPAC connections. Mount all hoses and valves for compressor cooling.
5.
The safety valves are fitted on the unit from factory. The pipe connection to the valve dis-
charge branch, must be made in accordance to valid rules/standards. External piping and
condensers are not protected by the safety valves fitted on the unit.
6.
Leak and pressure test according to the applied/local codes and rules. Isolate the com-
pressor unit from the test pressure, or disconnect pressure transducers and safety valves.
Never exceed the test pressure of the unit stated on the unit name plate. All DualPACs are
pressure tested and performance tested from factory.
7.
Connect power supply wiring (water/brine pumps) according to electrical diagrams.
8.
Make a final check of all relevant components, connections, electrical connections, safety
functions (meaning safety valve), safety high-pressure cut-out (below compressor safety
overflow valve and not above 0.9 x max. allowable pressure) and the machine room
safety equipment.
9.
Evacuate the unit.
10. Charge oil if not charged from factory.*
11. Charge refrigerant.
The R717 charge on the P&I diagram is only a guideline. The correct charge for the Dual-
PAC is achieved when the superheat in the evaporator is as described in the ChillPAC man-
ual (section
6.3 R717 charge
) and the liquid height in the open intermediate cooler
(GHUR) is at a level where the lowest placed sight glass is not completely filled with liquid.
Содержание SABROE DualPAC
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