Hanbell RC2-930A - Dual Capacity Control System (Optional)

Technical Manual VERSION 2.0 -10-18-2018
13
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c.
Stable/Holding
Standard: When both NC SV2
and NC SV1 are not energized,
piston can be held in
stable/holding position.
Option: When NO SV2 is
energized but NC SV1 is not
energized, piston can be held in
stable/holding position.
(N.C. / OFF;Oil bypasses)
(N.C. / OFF; Oil injection stops)
SV1
SV2
STABLE/HOLDING
(N.C. / OFF;Oil bypasses)
(N.O. / ON; Oil injection stops)
SV1
SV2
STABLE/HOLDING
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Continuous /stepless capacity control principle
Note: 1. Above T. & T' should be determined by system designer’s experience and end user’s application.
2. Capacity control must be kept at unloading for 1~3 min before start and for 60~90 sec before stop.
Loading/unloading functions
Figure 15 Loading and unloading functions
t
1,
t
3
: Pulse time 1 ~ 1.5 seconds
t
2,
t
4
: Pause time 15 ~ 20 seconds
2.9 Dual capacity control system (optional)
Figure 16 Dual capacity control
No. Component No. Component No. Component
1 Suction filter 7 Discharge bearings 13 Capillary
2
Gas in（low pressure）
8 Oil separator baffle 14 Solenoid valve
3 Motor 9
Gas out（high pressure with oil）
15 Solenoid valve
4 Oil filter cartridge 10 Lubricant 16 Solenoid valve
5 Suction bearings 11 Oil separator cartridge 17 Slide valve
6 Male rotor 12 Gas out (high pressure without oil) 18 Solenoid valve
Set point (target)
Set point  T’
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Set point + T
U U U U L L L S S S S S
1~3min
U
S
L
 Chilled water temperature
 Unloading
 Stable(holding)
 Loading
60~90sec
Chilled Water Temp .
Time
SV2 Open
SV2 Close
SV1 Close
SV1 Open
Loading (L)
Unloading (U)
Stable (S)
t
1
t
2
t
3
t
4
Start
Stop
Time
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Hanbell can provide compressors with capacity as
shown in the figure 16, and its control logic is the same
as those shown in chapter 2.7 and 2.8.
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