Issue: 01.05.2019 Page 21
Service & Maintenance
The condensing units are designed to give long life
operation with minimum maintenance. However, they
should be routinely checked and the following service
schedule is recommended under normal circumstances:
The removal of the top, side and front panels ensures that
all parts are accessible.
1. Compressor – Inspect at regular intervals
••••
Check for refrigerant leaks on all joints and fittings.
••••
Check mountings for tightness and wear.
••••
Check operation of crankcase heater.
••••
Check electrical connections.
••••
Ensure that no abnormal noise or vibration is detected
during test run.
••••
Check the compressor oil levels and top up if required.
The oil level should be ½ to ¾ way up the sight glass
(where fitted).
2. Condenser Fan Motor & Blade – Clean and inspect at
regular intervals
••••
Check for abnormal noise, vibration and fan imbalance.
••••
Ensure that the fan motor is clean and spins freely.
••••
Check that the condenser fan blade is clean and free
from restriction and damage/imbalance.
••••
Note:
The fan motor is pre-lubricated and factory sealed
so no maintenance is necessary.
3. Microchannel Condenser Coil – Clean and inspect at
regular intervals.
•
Remove surface dirt, leaves etc. with a vacuum cleaner
(preferably with a brush or other soft attachment rather
than a metal tube), compressed air blown from the
inside out, and/or a soft bristle (not wire!) brush. Do not
impact or scrape the coil with the vacuum tube, air
nozzle, etc.
•
Do not use any chemicals (including those advertised as
coil cleaners) to wash micro channel heat exchangers.
They can cause corrosion.
Rinse only.
Hose the MCHE off
gently, preferably from the inside out and top to bottom,
running the water thru every fin passage until it comes
out clean. Micro channels fins are stronger than
traditional tube & fin coil fins but still need to be handled
with care. Do not bang the hose into the coil. We
recommend putting your thumb over the end of the
hose rather than using a nozzle end because the
resulting spray is gentler and the possibility for impact
damage is less.
•
Micro channel heat exchangers, because of their fin
geometry, tend to retain water more than traditional fin
& tube coils. Depending on the specific design and
installation of your coil, it may be beneficial to blow or
vacuum out the rinse water from your unit to speed
drying and prevent pooling.
4.
Compact Brazed Heat Exchanger (BPHE)
** For EVI Units ONLY
•
Any soldering process done on the heat exchanger needs
to be brazed with minimum 45% silver solder at
maximum 450°C (840°F) when soft soldering and 450-
800°C (840-1470°F) when hard soldering.
•
Do not direct flame at BPHE and use wet rag to avoid
overheating of BPHE.
5. Controls
•
Check settings and operation of pressure switches.
•
Check overload setting.
•
Check fan speed control setting and operation
.
6. Power Supply – Inspect at regular intervals.
••••
Check the running current and voltage for the
condensing unit.
••••
Check the electrical wiring and tighten the wires onto the
terminal blocks if necessary.
7. Refrigerant Charge
•
Check the refrigerant charge by ensuring that the system
is operating correctly, the pressures are as expected and
that the liquid line sight glass shows a full bore of liquid
refrigerant.
•
Carry out a full leak test.
8. Compressor replacement (rotalock connections)
•
The rotalock connections as used on some
compressor models are factory sealed with Loctite
554 thread sealant. If the rotalock connections
need to be disassembled (e.g. compressor change),
then they should be thoroughly cleaned and Loctite
554 reapplied before reassembly. In case of
difficulty undoing the connections due to the
sealant, apply heat to the rotalock using a heat gun
for several minutes and then loosen using hand
tools whilst hot. Replacement of the ‘O’ ring seal
may be required. Please see recommended torque
tightening values on page 22.
Important Note:
Warning! – Disconnect the mains electrical
supply before servicing or opening the unit.
Содержание JEHR-0050-B1-M-1
Страница 13: ...Issue 01 05 2019 Page 13 Wiring Diagrams JEHR 0050 B1 M 1 JEHR 0067 B1 M 1 JEHR 0100 B1 M 1 JEHR 0113 B1 M 1 ...
Страница 14: ...Issue 01 05 2019 Page 14 Wiring Diagrams JEHR 0115 B1 L 1 JEHR 0135 B1 L 1 JEHR 0140 B2 M 1 ...
Страница 15: ...Issue 01 05 2019 Page 15 Wiring Diagrams JEHR 0140 B2 M 3 JEHR 0150 B2 M 1 JEHR 0175 B2 L 1 JEHR 0225 B2 L 1 ...
Страница 19: ...Issue 01 05 2019 Page 19 Wiring Diagrams JEHS 0750 B4 L 3 JEHS 0950 B4 L 3 EVI ...
Страница 20: ...Issue 01 05 2019 Page 20 Wiring Diagrams JEHS 1150 B4 L 3 EVI ...