Pressure Testing; Leak Detection - Daikin JEHCCU0040CM1 Installationsanleitung

●
The location must be well ventilated, so the unit can draw in and
distribute plenty of air thus lowering the condensing
temperature.
●
To optimize the unit running conditions, the condenser coil must
be cleaned at regular intervals.
3.2 Installation Clearance
●
The installation location should allow sufficient space for air flow
and maintenance around the unit.
Air Inlet
●
To allow sufficient space for doing service or installation.
3.3 Compressor handling
To ensure compressor reliability, the condensing unit and the
compressor must not be tilt greater than an angle of 45°.Otherwise,
the compressor can fall from its 3 compressor housing spring, which
results in noisyvibrations during
breakdown.
3.4 Field Piping
Important Note
Line sizing should only be determined by qualified
personnel. All local codes of practice must be
observed in the installation of refrigerant piping.
satisfactory operation and performance, the following points should
be noted for field piping arrangements,
●
Couples one indoor unit with one outdoor condensing unit only.
●
Release all the pre-charged nitrogenbefore pipework
connection.
●
Connecting pipe size for suction and liquid line must same
as attaches to the condensing unit. Correct line sizing will
minimize the pressure drop and maintain sufficient gas velocity
for proper oil return.
●
Pipework routes must be as simple and as short as possible.
Avoid low points on pipework where oil can accumulate.
●
Use only clean, dehydrated refrigeration grade copper tube with
large radius elbows. The piping shall be kept with enough
bending radius.
O-CU06-AUG17-3
All specifications are subjected to change by the manufacturer without prior notice. The English text is the original instruction.
Other languages are the translations of the original instructions.
Air Discharge
> 1.5 m
operationand possible to
Springs to absorb
vibrations
To
ensure
●
Braze without over filling to ensure there is no excess solder into
the tube.
●
To prevent oxidation, blow nitrogen through pipework when
brazing.
●
Install insulation on all suction lines after pressure test.
●
Adequately support all pipe work at a maximum of 2 meter
intervals.
●
For the condition where the outdoor condensing unit is above the
indoor unit, the height difference between units shall be less than
25 m and install oil trap on suction pipe every 4 m height. The
suction pipe must always be fitted with U-trap at the bottom.
●
For the condition where the outdoor condensing unit is below the
indoor unit, the height difference between units shall be less
than 4 m. Pipe trap shall be installed upward on outlet of indoor
unit (suction pipe).
●
The recommended piping length is 25 m or less.
●
Additional oil might be required in case field piping is long or with
many oil traps. Check the oil level of the compressor to decide to
add the oil after minimum 2 hours operation.
●
It is recommended as well to install the MOP (Maximum
Operation Pressure), expansion valve for medium evaporating
temperature units, if the working suction pressure during start
procedure especially after defrost cycle, is out of the limit, as
refer to the table provided.
Recommend compressor working pressure range:
Medium Temperature
Compressor Model AE/AJ
Refrigerant R404A R134a
Working Pressure Range
High Side, (barg)
13.2-27.7 6.7-15.8
Working Pressure Range
1.5-8.3 0.1-3.9
Low Side, (barg)
Low Temperature
Compressor Model AJ NTZ
Refrigerant R404A R404A
Working Pressure Range
High Side, (barg)
13.2-27.7 13.2-27.7
Working Pressure Range
0.1-3.3 0.1-3.3
Low Side, (barg)

3.5 Pressure testing

●
Make sure unit are isolated when pressure test on field piping,
always use an inert, dry gas such as Nitrogen. Check for leak if
there is reduction in holding pressure.
●
The pressure differential between the high and low side of
system shall not exceeded below value.
Compressor
AE/AJ
MTZ/ZB/ZF
●
Test pressures used in factory as shown follows.
Test pressure
High side
28 barg
(405 psig)

3.6 Leak detection

●
Make sure that all isolation valves are open.
●
Perform a leak test of the system using nitrogen mixed with the
approved refrigerant for the unit.
●
Do not use CFC for leak testing the condensing unit which
intended for used with HFC refrigerants.
●
The use of leak testing fluids is not recommended as this may
interact with the lubricants own additives.
MTZ ZB
R404A R134a R407C R404A R134a
13.2-27.7 7.9-15.8 12.5-29.4 7.14-27.6 6.6-15.8
1.0-7.2 0.6-4.7 1.4-6.6 1.98-7.14 0.6-3.8
ZF
R404A
13.2-27.7
0.1-3.3
Pressure differential
19 barg
(275 psig)
30 barg
(435 psig)
Low side
19 barg
(275 psig)
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