Carel uAD, User Manual, Page: 34 / 44

16
3 7
3 7
Fig. 5.s
Fig. 5.t
R14
R1
R13
Co02
0
Fig. 5.u
R16
R3
R15
Co03
0
Fig. 5.v
ENGL
ISH
µAD +030220465 - rel. 1.1 - 15.12.2010
5.12 Clock adjustment
Requisites (Fig 5.s)
• µAD with Real Time Clock
• Parameter En01 =1 (default value)
Adjustment of the clock (Fig 5.s)
• press the CLOCK key for 6 seconds, “rtc” and the current time (fl ashing) will appear on the display,
• press the UP or DOWN keys to set the hours (0...23),
• press the CLOCK key to memorise, the minutes fl ash,
• press the UP or DOWN keys to set the minutes (0...59),
• press the CLOCK key to memorise, “day” appears on the display. the current day fi eld fl ashes (Fig. 5.t),
• press the UP or DOWN keys to set the day (0...7),
• press the CLOCK key to end the procedure.
Note. After extended interruption of the network voltage the time must be reset.
5.13 Compensation (Co01=1)
By means of compensation the µAD dynamically modifi es the compressors set point of the µC 2 SE, improving
comfort and yield (energy saving). Practically, when the temperature approaches the environmental set point,
µAD increases or decreases the µC
2 SE adjustment set point. Compensation is only available in µC 2. SE and in
‘environmental adjustment’ mode (Pr01=0).
Compensation in cooling mode (warmer water)
When the environmental temperature approaches the set point, the plant will require warmer water. Compen-
sation intervenes by raising the compressor set point of the µC
2 SE, and setting the following parameters:
• ‘R1’ (µC 2 SE) - initial temperature of the water,
• ‘R13’ and ‘R14’ (µC 2 SE) - minimum and maximum water temperatures,
• ‘Co01=1’ (µAD) - enabling of compensation,
• ‘Co02’ (µAD) - maximum deviation of the environmental temperature from the set point (
1 ).
( 1 ) It is recommended to set Co02 equal to the differential of the environment set of the µC 2 SE multiplied
by 2. In this way the chiller works at maximum potentiality only for environmental temperatures at “medium
distance” from the set point.
To obtain the water offset value, the µChiller will carry out the following calculation:
water offset = R14-R1+(T environment – Tset point)*(R13-R14)/Co02.
The value obtained is limited between (R13-R1) and (R14-R1).
To prevent oscillations in the temperature adjustment the offset variation is limited in time (typically about
0.5°C max. every 5 min) (Fig. 5.u).
Attention. This function has been designed for air-water or water-water plants. It must NOT be activated if
H1 =0 or H1=1. Moreover, it cannot be applied in the ‘process’ mode.
Compensation in heating mode (cooler water)
When the environmental temperature approaches the set point, the plant will require cooler water. Compensa-
tion intervenes by compensating the compressor set point of the µC
2 SE and setting the following parameters:
• ‘R1’ (µC
2 SE) - initial temperature of the water,
• ‘R15’ and ‘R16’ (µC 2 SE) - minimum and maximum water temperatures,
• ‘Co01=1’ (µAD) - enabling of compensation,
• ‘Co03’ (µAD) - maximum deviation of the environmental temperature from the set point (
1 ).
( 1 ) It is recommended to set Co03 equal to the differential of the environment set of the µC 2 SE multiplied
by 2. In this way the chiller works at maximum potentiality only for environmental temperatures at “medium
distance” from the set point.
To obtain the water offset value, the µChiller will carry out the following calculation:
water offset = R15-R3+(T environment – Tset point)*(R15-R16)/Co03.
The value obtained is limited between (R15-R3) and (R16-R3).
To prevent oscillations in the temperature adjustment the offset variation is limited in time (typically about
0.5°C max. every 5 mins) (Fig. 5.v).
Attention:
This function has been designed for air-water or water-water plants. It must NOT be activated if H1 =0, H1= 1
or H1=11. Moreover, it cannot be applied in the PROCESS mode.
5.14 Fans function
By setting the parameter En03=1, the HUM key no longer activates humidifi cation but forced manual switch-on
of the fans. This function is only valid with µC
2 SE.
Temp.
set point
Env.
ambiente
Temp.
set point Env.
temp.
Cooling mode
compensation
(water offset)
(water offset)
Heating mode
compensation