Hitachi RAS-H(V)RNME-AF Service Manual page 139

5 Control system
Space cooling general control conditions
If "Water Type heating" reads "None" (disabled), then all space control cooling is disabled.
Space Cooling mode is activated by any of the following events:
Space Cooling mode selected by user (YUTAKI S LCD controller) and
-
- Space Cooling mode activated by external thermostat signal (ATW-RTU-01) (Installation Option 1) or
- Space Cooling mode activated by intelligent thermostat (ATW-RTU-02) (Installation Option 2)
Space Cooling mode is disabled if:
- DHW operation mode is in DHW priority AND DHW is in load condition
- No-load condition is active (all of the activation events are inactive).
Water temperature set-point
Each of the 2 water circuits will have an independent water set-point.
Water circuit set-point configuration can be set as follows:
CODE
3-004
3-104
Where:
None: Cooling circuit is disabled.
OTC Points: Water target is selected by an Outside Temperature Compensated (OTC) control that is defined by 4
different points (Minimum and maximum water outlet temperatures vs. Minimum and maximum outdoor ambient
temperatures).
Fix: Water target value is defined by a fixed temperature set by the user.
129
SMGB0070 rev. 1 - 08/2011
REF
CIRCUIT 1 (Direct circuit)
WTc1 Water Calculation Cooling C1 (Note; OTCpoints; Fix)
CIRCUIT 2 (Mixed circuit)
WTh2 Water Calculation Cooling C2 (Note; OTCpoints; Fix)
Description Default Value
Fix
None
5