Instruction manual

OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
14 (32)
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
AP
SPC
BP
RVC/e
TSR
FS
PFS
BACK OF UNIT
ST
SM
SE
Fig. 5.b.
MODELS WM* 0551-0661
REGULATION OF CONDENSATION PRESSURE
Standard units are fitted with an On/Off pressostat.
As an alternative, condensation pressure can be
controlled by a TRIAC voltage regulator on the
condenser fan power supply. The regulator is optional
(see Function Limits) and has the code RVC/e; it is
controlled by the microprocessor as a function of the
condensation temperature read by the SPC
condensation pressure sensor.
The setting - done on the user terminal - has the
following standard values:
CUT-IN
(
default: 21,5bar
)
DIFFERENTIAL
8 bar
p.
COND
ON
OFF
PV
T. MIN (default: 35°C)
T. MAX (default: 50°C)
Minimum speed
15%
V
PROPORTIONAL BAND
T.
COND
Maximum speed
100%
RVC/e
• maximum speed for 18,5 bar-r condensation
pressure (50°C saturated condensation temperature
with R22 and 47.5°C with R407C)
• minimum speed for 35°C saturated condensation
temperature, corresponding to delivery pressure of
12,7 bar with R22 and 14,5 bar with R407C
• minimum fan power supply voltage (cut-off voltage)
of 15% of mains voltage.