Connection To Room Thermostats (On/Off); Connection To Weather Temperature Probe; Frost Protection; Connection To 0-10V External Thermoregulator - Riello Condexa Pro2 EVO Series Installation Instructions Manual

ELECTRICAL SYSTEM

6.2.4 Connection to room thermostats (on/off)

Connect up the high temperature system room thermostat to
terminals 9. and 10 ("Figure 11").
The thermostat for the low temperature system must instead be
connected to terminals n. 11 and 12 ("Figure 11")..

6.2.5 Connection to weather temperature probe

If you want to use a weather thermoregulator, the external
probe (optional) must be connected up to terminals n.7 and 8 ().
The external probe must be placed on an outer wall facing north
to north-east at a height of at least 2.5 metres and at a distance
from windows, doors and air vents.
Protect the probe from direct exposure to the sun. Contact the
Technical Assistance Service authorized by
to be adjusted or the weather function excluded.
Correspondence table for all sensors
Measured temperatures (°C) - Resistive values of the sensors (Ω).
T (°C) R (Ω) T (°C) R (Ω)
-20 67739 13 15912
-19 64571 14 15289
-18 61568 15 14694
-17 58719 16 14126
-16 56016 17 13582
-15 53452 18 13062
-14 51018 19 12565
-13 48707 20 12090
-12 46513 21 11634
-11 44429 22 11199
-10 42449 23 10781
-9 40568 24 10382
-8 38780 25 9999
-7 37079 26 9633
-6 35463 27 9281
-5 33925 28 8945
-4 32461 29 8622
-3 31069 30 8313
-2 29743 31 8016
-1 28481 32 7731
0 27279 33 7458
1 26135 34 7196
2 25044 35 6944
3 24004 36 6702
4 23014 37 6470
5 22069 38 6247
6 21168 39 6033
7 20309 40 5828
8 19489 41 5630
9 18706 42 5440
10 17959 43 5258
11 17245 44 5082
12 16563 45 4913

6.2.6 Frost protection

The heating unit electronic control includes a frost protection
function. When the flow temperature sinks to below a minimum
value, the burners start working at minimum power according
to the procedure used to set the functional parameters.
The frost protection mode is activated even if the external probe
(supplied with the appliance) is not connected to the boiler: pa-
rameters 14 (related to the Ch1 high temperature system) and 22
(Ch2 low temperature system) are in fact in default and set in
weather function.
Should one not want to connect the probe, the boiler must be
made to work at a fixed point to avoid problems. The parameter
14 and 22 settings may only be altered by a Technical Assistance
Service authorized by R .
R if the curve has
T (°C) R (Ω) T (°C) R (Ω)
46 4751 79 1717
47 4595 80 1669
48 4444 81 1622
49 4300 82 1577
50 4161 83 1534
51 4026 84 1491
52 3897 85 1451
53 3773 86 1411
54 3653 87 1373
55 3538 88 1336
56 3426 89 1300
57 3319 90 1266
58 3216 91 1232
59 3116 92 1199
60 3021 93 1168
61 2928 94 1137
62 2839 95 1108
63 2753 96 1079
64 2669 97 1051
65 2589 98 1024
66 2512 99 998
67 2437 100 973
68 2365 101 948
69 2296 102 925
70 2229 103 901
71 2164 104 879
72 2101 105 857
73 2040 106 836
74 1982 107 815
75 1925 108 796
76 1870 109 776
77 1817 110 757
78 1766
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Power and fuel gas supply must be activated and the water
system at a correct pressure for the frost protection system
to function.
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QGlycol can be used as an additive for the system (up to a
maximum of 50%) there where considered necessary by the
person responsible for the project, keeping in mind that this
substantially reduces efficiency as it alters the specific heat
of the fluid. Furthermore several parts of the system could
be damaged by altering the pH.
6.2.7 Connection to 0-10v external
thermoregulator
An external thermoregulator connection using a 0 – 10 v signal
could be used by connecting the output signal to terminals n.13
and 14 ("Figure 11").
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The positive pole of the signal output must be connected to
terminal 13 for the device to work correctly.

6.2.8 Connection to alarm device

A beeping or visual alarm device, to signal any technical faults,
may be connected outside by a special output with clean con-
tact on the boiler terminal board.
The alarm device must be connected to terminals n.18 and 19
("Figure 11").

6.2.9 Remote control

If the remote control is to be used, it must be connected to ter-
minals no. 15, 16 and 17 ("Figure 11").

6.3 Emergency mode

The Condexa Pro2 EVO electronic control system includes a func-
tional mode called "Emergency", which can be activated in case
of a Master board malfunction.
The master board can in fact be excluded so as to enable the
system to work with a flow temperature preset in default by the
manufacturer, guaranteeing the heating unit with continual
service.
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Qualified personnel only may work on the electrical system
and in compliance to provisions of the law, with particular
attention to rules on safety.
The following procedure must be adopted to enable the "Emer-
gency" function:
− Disconnect the 4-pole J14 connector from the master
board (see "Figure 12" );
− set all four J17 switches located on each Slave of the ther-
mal assembly on the Off position (see "Figure 13" );
− Supply power to all the circulators in the system direct-
ly from the mains using the specific relays/change-over
switches;
− Connect terminal X1 or terminal X2 (which are part of the
J14 connector wiring disconnected during the first step
of this procedure) to a 24 V ac power supply (see "Figure
15").
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