Daikin EWWQ090G, Руководство по эксплуатации, Страница: 43 / 58

EWWQ090G ÷ EWWQ720L - R410a - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410a - Condenser less
EWHQ100G ÷ EWHQ400G - R410a - Heat pump scroll chillers
Water cooled scroll chillers & heat pump Operation
Manual
EWWQ - EWLQ - EWHQ
Water cooled scroll chiller &heat
pump
D-EOMWC01203-15EN
Operation Manual
43
Press Low”. The status is automatically cleared when the evaporating pressure rise above the Low
Pressure Hold limit.
If the evaporating pressure drops below the Low Press Alm limit the related circuit is immediately
stopped and a Low Pressure Alarm is generated.
See section 6.1.6.2 to troubleshoot this problem.
5.3.2 High Condensing Pressure
When the circuit is running and the condensing pressure rises above the safety limits the circuit
control logic reacts at two different levels in order to recover the normal running conditions.
If the condensing pressure rises above the High Pressure Unload limit and at least two compressor
in the same circuit are on, one
compressor is shut down in order to recover the normal operating
conditions.
This condition is indicated on the controller display in the circuit status as “
Run: Cond
Press High”. The status is automatically cleared when the condensing pressure falls below the
High Pressure Hold limit by 862 kPa.
If the condensing pressure rises above the Hi Press Stop limit the related circuit is immediately
stopped and an High Pressure Alarm is generated.
See section 6.1.6.3 to troubleshoot this problem.
5.4 Condensation Control
The UC provides the possibility to choose between three different types of condensing control:
1. Pressure
2. Cond In
3. Cond Out
Depending on the unit type (Chiller, Condenser less, Heat pump with water inversion, Heat pump
with gas inversion) only some of the previous condensing controls are available.
5.4.1 Pressure
Pressure control is available for the following unit type:
- Chiller
- Condenser-less
In this control mode the controller regulates the condensing saturated temperature (quantity
directly connected to the condensing pressure). From the menu Circ x Cond Control 4.3.1.2 is
possible set condensing saturated temperature setpoint and the maximum and minimum output of
the regulation signal.
When this condensing control mode is active the controller provides two 0-10V signals (one per
circuit) that can be used to control one/two remote condensers (in case of condenser-less unit) or
one/two water valves (in case of chiller).