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Thermostat
FAQ
1. Which thermostat objects must be used in the ETS
project? For each one, should a dedicated ETS group be
created or should "common groups" be created?
For the objects listed below, you must create a separate
group for each datapoint of each thermostat: 10, 11 (if there
is Thermostat B), 12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25,
26, 27, 28, 29, 30, 31, 32, 34, (35 if the system has 4 PIPES
and a COOLING valve), (38 if there is a proportional fan coil),
39, 40, 41, 42, 43, (44 if there is a PROPORTIONAL fan),
45, 46, 47, 48, (52 if there is a window contact that has to
switch off the climate control) 56 and 57 (110, 111 if using
the contact on the thermostat; if used for MANAGING THE
WINDOW CONTACT IT HAS TO BE PAIRED WITH THE
SAME GROUP AS DATAPOINT no. 52 for Thermostat A or
DPT 99 for Thermostat B and 112,113 if using the relay on
the thermostat).
When also using Thermostat B: 59, 60, 61, 62, 63, 64, 65,
66, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, (82 if the
system has 4 PIPES and a COOLING valve and 85 if there
is a proportional fan coil), 86, 87, 88, 89, 90 (91 if there is a
PROPORTIONAL fan), 92, 93, 94, 95, (99 if there is a win-
dow contact that has to switch off the climate control), 104
and 105.
Note.
You could also create a general group with the Summer/
Winter control of all the thermostats (DATAPOINT 19 for
Thermostats A and 66 for Thermostats B), but if it is a system
in which there is the Well-contact Suite supervision software
we recommend that you create a group for each single
Thermostat A and for each single Thermostat B.
2. What does the "Thermostat Mode" object represent?
It refers exclusively to the mode the thermostat is currently
in (or the mode you want to put it into given that the corre-
sponding object is also present in write mode).
It does not indicate whether it is summer or winter. The
possible options are:
01 = Comfort
02 = StandBy
03 = Economy
04 = Protect/Off
To see whether the thermostat is in Off mode you can go and
read object 15 "Off A: Mode - control" or object 62 "Off B:
Mode - control" which will answer 1 if the thermostat is Off
or 0 if it is in another operating mode.
3. What difference is there between the "Protected" object
and "Off" in "Antifreeze-Too Hot" operation?
The "Protected" object is used and acts as Off in the event
that the "Temperature Setpoint" parameters and the items
"Antifreeze" and "Too Hot" are set to "Control Off". So in
this case when the object "Protected" is activated, the
thermostat entirely disables temperature control and does
not even send its current setpoint over the bus. In normal
installations it is therefore recommended to set "Control
On" on the parameters "Antifreeze" and "Too Hot" and
to set the corresponding two temperatures. This avoids
the risk of frozen pipes in the winter and excessive room
overheating in the summer. The "Off" mode on the other
hand also inhibits "Too Hot" and "Antifreeze" and should
never be used in normal installations. The "Off Mode" object
turns off the thermostat even if the temperature falls below
zero (i.e. it does not activate Heating/Air conditioning). It
is advisable to use the "Protected" object, which switches
the thermostat to Off or protected (Antifreeze) depending
on how the relevant parameters are set (summer or winter).
4. What is the function of the "Thermostat Off" object and
what applications can it have?
Thermostats have various objects created for operation with
our Well-contact Suite hotel software. The "Thermostat Off"
object blocks thermostat bus communication (both recep-
tion and transmission). This function is dedicated to Vimar
supervision software.
5. What is the function of the "Off" mode and what applica-
tions does it have?
The "Off Mode" object turns off the thermostat even if
the temperature falls below zero (i.e. it does not acti-
vate Heating/Air-conditioning). It is advisable to use
the "Protected" object, which switches the thermo-
stat to Off or protected (Antifreeze) depending on how
the relevant parameters are set (summer or winter).
6. What is the function of the "Comfort" object?
Unlike the "Energy Saving", "Protected" and "Off" objects,
which do not permit the sending of a "0" bit, if the "Comfort"
object is set to "1", the thermostat switches to comfort mode
at the design temperature or at the custom temperature pre-
viously set by the guest. If this object is set to "0" the thermo-
stat switches to standby mode (at the design temperature
or at the custom temperature previously set by the guest).
7. What is the function of the "Summer Protected" object?
It is the protected mode setpoint in air conditioning opera-
tion. It corresponds to protected mode in heating operation
(with air conditioning operation it cools if the temperature
exceeds the setpoint whereas with heating operation it heats
if the temperature falls below the setpoint).
8. On thermostats 20542, 16922 and 14522 a single bit
was used to activate/deactivate antifreeze. What is
used now?
The "Protected" object (summer or winter) is used.
Note.
Antifreeze (or its analogue "Too Hot") must be active in the
object parameters so as not to obtain an Off.
9. On thermostats 20542, 16922 and 14522, to deactivate
"Antifreeze" mode it was sufficient to send a "0".
What needs to be done with the new thermostats? Do
you need to change mode, for instance "Economy"?
Yes, the installer decides whether the user can turn the
system off or set it to "Antifreeze" mode. Depending on the
set ETS parameters, the thermostat switches to "Antifreeze"
mode and returns to the previous mode only when the win-
dow is opened and closed, whereas if the thermostat is set
to "Protected" mode from the bus, it will subsequently be
necessary to change the mode.
10. On thermostats 20542, 16922 and 14522, a single bit
was used to read the antifreeze status; in supervision
single bits ("0" or "1") and not bytes are required. Where
is this object/status to be found?
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