J&E Hall JEHR-0050-B1-M-1, Руководство по установке

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Issue: 01.05.2019 Page 6
Installation
The correction factor of refrigerant R407A is shown as below table:
The correction factor of refrigerant R407F is shown as below table:
The correction factor of refrigerant R448A/R449A is shown as
below table:
Insulation selection (For EVI units only)
The liquid pipe connecting CCU service valve to the evaporator
must be well insulated with recommended wall thickness of
minimum ¾’’.
Expansion valve selection (For EVI units only)
The lower liquid temperature of the EVI units can increase
evaporator expansion valve capacities
.
Selection of the expansion
valve needs to be done based on the expected amount of sub-
cooling shown in below tables:
(A.)
R404A
Amount of Sub-cooling (K)
Ta\Te -40 -35 -30 -25 -20
27
39.9 36.9 33.9 30.9 27.9
32
40.9 37.9 34.9 31.9 28.9
35
41.5 38.5 35.5 32.5 29.5
38
42.1 39.1 36.1 33.1 30.1
43
43.1 40.1 37.1 34.1 31.1
(B.)
R407A
Amount of Sub-cooling (K)
Ta\Te -40 -35 -30 -25 -20
27
33.1 32.8 32.4 32.1 31.8
32
38.0 37.0 35.9 34.9 33.8
35
41.0 39.5 38.0 36.5 35.0
38
43.9 42.0 40.1 38.1 36.2
43
48.9 46.2 43.5 40.9 38.2
(C.)
R407F
Amount of Sub-cooling (K)
Ta\Te -40 -35 -30 -25 -20
27
33.8 33.5 33.1 32.8 32.5
32
38.8 37.8 36.7 35.7 34.6
35
41.9 40.4 38.8 37.3 35.8
38
44.9 42.9 41.0 38.9 37.0
43
50.0 47.2 44.5 41.8 39.0
(D.)
R448A/R449A
Amount of Sub-cooling (K)
Ta\Te -40 -35 -30 -25 -20
27
33.1 32.8 32.4 32.1 31.8
32
37.9 36.9 35.8 34.8 33.8
35
40.9 39.4 37.9 36.4 34.9
38
43.8 41.9 40.0 38.0 36.1
43
48.8 46.1 43.4 40.8 38.1
Pressure testing
The condensing units are pressure tested in the
factory prior to dispatch. All units come with a holding
charge of oxygen free nitrogen.
Once the pipework installation is complete, it should be pressure
tested prior to evacuation to test for leaks.
A pressure leak test should be carried out using oxygen free nitrogen
(OFN). NEVER USE OXYGEN FOR PRESSURE TESTING SYSTEMS. A
calibrated nitrogen pressure regulator must always be used. Before
starting any pressure testing, ensure the area surrounding the
system is safe, inform relevant personnel and fit warning signs
indicating high pressure testing. Also, use correct PPE as required.
Always pressurize the system slowly, preferably in stages up to the
maximum required pressure. Maximum test pressures applicable
to the unit are as follows:
Listen for any possible leaks and check all joints with bubble spray.
If any leaks are discovered, release pressure slowly from system
until empty, repair leak and then restart pressure testing procedure.
Never attempt to repair a leak on a pressurized system.
A strength test should also be incorporated (to installed pipework
only) according to local regulations.
Once testing has been completed satisfactorily, release the
pressure from the system gradually and safely to external
atmosphere.
Ta Te (Watts)
-40 -35 -30 -25 -20
27 CF 0.73 0.73 0.73 0.73 0.73
32 CF 0.68 0.69 0.69 0.70 0.70
35 CF 0.65 0.66 0.67 0.67 0.68
38 CF 0.62 0.63 0.64 0.65 0.66
43 CF 0.57 0.58 0.60 0.61 0.63
Ta Te (Watts) -40 -35 -30 -25 -20
27 CF 0.72 0.73 0.73 0.73 0.72
32 CF 0.68 0.68 0.69 0.69 0.69
35 CF 0.65 0.66 0.66 0.67 0.67
38 CF 0.62 0.63 0.64 0.65 0.65
43 CF 0.57 0.58 0.60 0.61 0.62
Ta Te (Watts) -40 -35 -30 -25 -20
27 CF 0.71 0.72 0.71 0.72 0.72
32 CF 0.67 0.68 0.68 0.68 0.69
35 CF 0.65 0.65 0.65 0.66 0.67
38 CF 0.62 0.63 0.63 0.64 0.65
43 CF 0.58 0.59 0.59 0.60 0.61
Test pressure
High side Low side
28 barG
(405 psiG)
19 barG
(275 psiG)