Carel heaterSteam UR Series, User Manual

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68
ENG
“heaterSteam” +0300075EN - rel. 1.2 - 29.09.2015
13.2.4 Independent control with relative humidity
transducer and one for delivery humidity
limitation (parameter A0 = 3)
Even in this case, the controller modulates the production of steam
according to the measurement of% rH, performed by the main
transducer of relative humidity but, in addition, it limits the value if the
relative humidity% rH2 measured by a second off set transducer placed
in air duct downstream of the humidifi er exceeds the maximum desired
value. To prevent the relative humidity measured by the transducer in the
air duct downstream from the humidifi er exceeding a value considered
as excessive, the control module with independent control and second
transducer connected allows a high outlet relative humidity alarm
threshold P9, to be programmed. If this threshold is exceeded, after a
programmable delay P4, an alarm state is activated, with closing of the
contact of the corresponding relay on the main control board.
P7
Pm
P0
Steam_Pr_Lim
P8
P8/10
A53 variable
Fig. 13.d
Key window
Steam_
pr_Lim
Steam production limit %rH2 Delivery limit humidity probe
P0 Max production P8 Delivery diff erential
Pm Min production P7 Delivery humidity setpoint
13.2.5 Application for steam baths (T-type control
module)
In applications for steam baths, where the control probe measures
temperature rather than humidity, the same considerations are valid as
for the type H control module with modulating action and independent
control.
Recommended CAREL transducer: SSTOOB/P40, ASET030001 or
ASET030000.
13.3 Setting the alarm thresholds (type H or
T control module)
The control module panel allows the setting of limit thresholds for the
activation of the alarm in the event where these are exceeded. These
alarm thresholds can be programmed using the following control
parameters:
•
P2: high relative humidity alarm threshold, measured by the room
probe;
•
P3: low relative humidity alarm threshold, measured by the room
probe;
•
P4: alarm signalling delay (to prevent false signals);
•
P9: high relative humidity alarm threshold, measured by the outlet
probe (for ducted humidifi cation).
The parameters P2, P3, P4 can be programmed only when A0 = 2 or
3; parameter P9 can be programmed only when A0 = 3. Furthermore,
the control module provides the signaling of excessive conductivity
(and hence the concentration of salts) of the supply water, but only as
a default setting.
Warning : the parameter A0 and the operating and alarm
parameters: Px and b0 are set in the factory (default values valid
for normal applications). Nonetheless, these can be modifi ed by the user,
following the instructions contained in: “Start-up and user interface”.
13.4 Automatic total drain due to inactivity
For hygiene reasons it is recommended to empty the boiler to
prevent water residues from remaining inside it in case there isn’t any
humidifi cation request for a long time.
For models UR*H* and UR*T* * the user can set the automatic total drain
in case of inactivity as follows:
•
The drain for inactivity is active by default. To disable it, simply go to
parameter “b1” and operate as described in the table in chapter 12;
•
Vice versa, if the drain for inactivity has been disabled, to enable it go to
parameter “b1” and operate as described in the table in chapter 12 and
set the maximum inactivity period through the parameter bC.
The automatic total drain for inactivity is enabled by default and the max.
allowable default inactivity period is 3 days: which means that the boiler
is emptied automatically after heaterSteam has been on for at least 3 days
without humidifi cation request.
Parameter bC
Variation range 1 to 199 days
Default 3 giorni
Step 1 day
Comments the heaterSteam should remain turned on to empty
the boiler UR*H* and UR*T*: the display shows “idr”
during the automatic total drain for inactivity.
Tab. 13.i
13.5 User-adjustable duration of dilution
drain
The duration of the dilution drain can be adjusted through the new user
parameter bD which defi nes the new duration as a % of the internally set
default duration: new duration= default duration x bD / 100.
Example: if the internally set duration is 10 s and bD= 50%, the new
duration shall be = 10 s x 50 / 100= 5 s.
Parameter bD
Variation range 0 to 190 % (0 % disables the dilution drains.
Attention: see the comments below
Default 100 %;
Step 10 %.
Comments bD= 0 % means that dilution drains are NOT DONE at all.
WARNING: RISK OF FOAM/CORROSION as the internal
conductivity will increase. We recommend to set bD= 0
after a very careful evaluation of the water quality and
consequences.
bD= 100 % means that the default duration will be used
bD< 100 % means that the duration is < default duration:
less fresh water is introduced after the drain thus reduc-
ing its negative impact on the steam production (good
for high precision applications), but the drain valve will
open more frequently in order to control the internal
conductivity (decreasing lifetime).
Attention: RISK OF FOAM IN CASE THE bD VALUE IS TOO
SMALL IN RELATION TO WATER QUALITY
setting the bD for a high-precision control of %UR: bD
should be decreased as much as possible, yet avoiding
foam/corrosion. Find the most suitable value
Tab. 13.j