Version 2.02 15.05.2007 Function of VS 3000
38
If pressure drops to a level smaller than HR max. - HR dif., fan stages are unloaded subject to the basic and
variable unload time. Heat recovery mode is activated through Digital Input 21.
t
Time
ZNR. 51203 65 530 E0
c
High pressure (HP)
Max. pressure at HR
Fan step up Fan step down
VS 3000 Control algorithm heat recovery mode (HR mode)
Level HP cutout
no
step
no
step
no
step
Dif. HR
Changes to control action in HR mode:
S High-pressure fault is not signalled.
S No compressor load shedding in high-pressure fault.
HR mode is indicated on the display of the CI 3000 Store Computer or AL 300 Operator Terminal:
S HR mode active:
t
c-Setp.
HR 45°C
p
c-Setp.
HR 20.85b
S HR mode not active:
t
c-Setp.
45°C
p
c-Setp
. 20.85b
3.28 HP setpoint increase
The option is given with the VS 3000 Pack Controller of entering a temperature offset tc Offset N (Menu 3-3-2), which
is added to the setpoint temperature t
c_Setp
when setpoint toggle is active.
3.29 Fan protection / HP base load rotation
Additional functions for protection of the fan motors have been implemented in the VS 3000 Pack Controller.
During periods of low outdoor temperatures, when only a small part of the condenser fans are needed, it is
possible for fans to seize after being idle for an extended time.
This can be avoided by preventing extended standstill of fans with the BaseLoadRot.F parameter (Menu 3-7). When
base load rotation is activated, the following additional entries appear in the operating screen:
1. On time cond.: One of two modes can be selected:
-Fan
protection
When On time cond.issettoN, the fan control scheme r emains unchanged. Fans are loaded in the
sequence from L1 to Ln and unloaded from Ln to L2. Fans that have been off for longer than the definable
CycletimeF.(Menu 3-7) are then started for a period of 20 seconds.
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