UST500 CONTROL BOARD
46 06MC0074@00B0100
14/04/2010
Operating modes
Always on digital mode
The internal circuit water pump is always active, unless
•
one
or
more
alarms are blocking the internal circuit water pump;
•
the device is switched OFF locally or remote, and antifreeze with water pump is not active if enabled. (*)
•
the device is switched to stand-by locally or remotely and antifreeze with water pump is not active if enabled. (**)
(*) The pump switches off immediately.
(**) The pump switches off after the set safety delay (e.g. after the delay following compressor shut-down)
Digital operation on request
The internal circuit water pump is switched on when requested by the temperature controller.
In addition*
•
The compressor is switched on with a set delay (Pa PI02) after the internal circuit water pump switches on.
•
The internal circuit water pump is switched off with a delay (Pa PI03) after the temperature controller enters the OFF state and from
machine standby.
•
During defrost, when the compressor is OFF, the circuit water pump stays on.
•
The pump is on if internal circuit antifreeze heaters are active (if enabled in parameter PI22 – see table. See also the heaters chapter,
parameters HI00, HI01).
Table PI22
Parameter
Description
Value
0
1
PI22
Enable internal circuit water pump on when
antifreeze heaters active
Internal circuit water
pump disabled
Internal circuit
water pump
enabled
•
The pump is on if the heaters are on in integrated use.
•
The pump is on if the boiler is on
The internal circuit water pump is off if
•
Temperature control is not requested (except for * - see above)
•
One or more active alarms are blocking the internal circuit water pump;
•
the device is switched OFF locally or remotely (*).
(*) The pump switches off immediately.
Diagram A
TERM: temperature controller
COMPR: compressor
WP: internal circuit water pump
Time: time in seconds
PI02: Delay internal circuit pump on -
compressor on
PI03: Delay compressor off - internal circuit
pump off
The internal circuit water pump is switched on when requested by the temperature controller.
In addition:
•
the compressor is switched on with a delay (PI02, see table 3 par. PI02-PI03) after the internal circuit water pump is switched on
•
the internal circuit water pump is switched off with a delay (PI03, see table 3 par. PI02-PI03)) after the compressor is switched OFF and after machine
enters STD-BY state
•
when the compressor is OFF during defrost, the internal circuit water pump stays on
•
the internal circuit water pump is on during internal circuit antifreeze is this function is enabled in the relative parameter
Table 3 (par.
PI02
-
PI03
)
Parameter
Description
PI02
Delay internal circuit water pump on and compressor on
PI03
Delay compressor off - internal circuit water pump off.
Pa PI03
Pa PI02
ON
OFF
Time
TERM
ON
OFF
Time
COMPR
ON
OFF
Time
WP
