Danfoss VZH Series - Technical Specifications; Compressor Specifications; Frequency Converter Specifications; Oil Injection Control

Application guidelines
9FRCC.PC.023.A7.22
Single compressorsTechnical specifications
Compressor specications
Frequency converter
specications
Compressor model
Swept
volume
(cu.in/rev)
Displacement
Oil charge
(oz)
Net weight
(lbs)
25 rps
(cu.ft/h)
50 rps
(cu.ft/h)
60 rps
(cu.ft/h)
100 rps
(cu.ft/h)
VZH088 5.39 272 544 657 1088 112 121
VZH117 7.13 357 717 869 1434 122 134
VZH170 10.39 523 1045 1261 1914 228 247
Mains supply voltage
T2: 200 - 240 V +/-10% (3-phase)
T4: 380 - 480 V +/-10% (3-phase)
T6: 525 - 600 V +/-10% (3-phase)
Supply frequency 50 / 60 Hz
Output voltage 0 - 100 % of supply voltage
Inputs 6 digital (0 - 24 V), 2 analogue (0 /±10 V or 4 - 20 mA, scalable)
Programmable outputs 2 digital (0- 24 V), 1 analogue (0-24 V), 2 relay
Protection functions Over-current protection, low / high current handling
Compressor functions
Discharge gas temperature protection, pressostat / thermostat function, short
cycle protection, oil return management
Oil injection control
Bearings lubrication
VZH compressors are equipped with an oil
injection system that makes the compression
pockets more tight thus improving the isotropic
eciency of the compressor as well as controls
the oil circulation ratio, at all running speeds.
The frequency converter via an oil injection valve
controls this system. The oil injection valve is a
normally closed valve. At low speed, the valve
is closed and the oil is injected to the scroll set
suction ports.
The compressors are delivered with no coils.
208V-240V or 24V coils are available as accessory
(refer to “Accessories” section). The coil must be
installed for oil injection control.
Control parameters are factory preset but
accessible on the parameter list as read only
values.
Optimal bearings lubrication is ensured by a
gearotor oil pump at all compressor speeds.