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4.3.1 Motor windings
YHV*2P compressors feature a three-phase brushless permanent magnet motor. The motor is
connected in star.
The motor insulation material is class "B" (maximum allowable operating temperatures according to
IEC 34-1 or DIN 57530).
4.3.2 Protection devices
Fuses must be installed before the drive.
The selection of fuses has to be made according to EN 60269-1 or EN 60204-1 and drive
maximum operating current (MOC). Not installing fuses or selecting inappropriate fuses may result
in compressor and/or drive failure.
4.3.3 Crankcase heating function
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard!
Incorrect wiring during installation or service could create a spark on the
connection.
CAUTION
Overheating and burnout! Compressor damage! Never apply power to the
crankcase heater in free air, before the crankcase heater is installed on the
compressor or when it is not in complete contact with the compressor shell.
IMPORTANT
Oil dilution! Bearing malfunction! Follow the off-cycle migration statement
described below for long term reliability and to minimize nuisance associated
with flooded start conditions.
Contrary to standard fixed-speed Copeland Scroll compressors, the YHV*2P models do not require
any optional external crankcase heater to be mounted on the compressor.
Instead, the ED3 drive has a programmable feature that will utilize the motor windings to provide up
to 50 Watts DC of heating to serve as a crankcase heater.
The crankcase heating function activation is recommended when the system charge exceeds the
refrigerant charge limit indicated in Table 7 below:
Compressor
YHV0182P / YHV0252P
YHV0382P
Table 7: Refrigerant charge limit
If this function is required and no off-cycle migration testing across the envelope for winter and
summer situations is performed, the crankcase heating function must always be powered to 50 Watts
when the compressor is "Off".
To use less than 50 Watts, off-cycle migration testing must be performed. To perform migration
testing, a compressor fitted with a sight-tube showing the oil level and any accumulation of liquid in
the compressor is required and can be ordered from Emerson.
NOTE: At first start, the crankcase heating function must be turned on a minimum of
12 hours prior to starting the compressor.
4.4
Pressure protection devices
4.4.1 High-pressure protection
The high-pressure protection should be installed according to EN 378. The high-pressure limiter has
to be connected to the ED3 drive (see Figure 20&F3
depending on the system type
Figure 21). The output is a 5 VDC signal. Normally the high-pressure limiter must be closed. If the
limiter is open, the drive will not operate.
AGL_HP_VS_YHV2P_E_Rev0
Refrigerant charge limit
3.6 kg
4.5 kg
.........HP limiter
Grey = optional,
21
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