IVAR MULTIMIX Instrucciones Para Una Correcta Instalación página 10

3. ADJUSTMENTS
Adjusting the system (mixing module)
For the system's optimal balance, the installer must adjust the regulators, which can be found in various points of the MULTIMIX-heating
circuits unit. The diagrams regarding the mixing valve and the secondary by-pass, the pressure loss diagrams for the high temperature and
mixing kits and the flow/prevalence curves for the circulators which may be installed on the MULTIMIX can be found at the end of this in-
struction manual. These graphs allow the designer to size the system properly and to provide the installer with the correct settings for each
individual component. In addition, once the thermostatic head or motor has been installed, these devices will command the mixing valve in
such a way so as to ensure that the configured output temperature is reached. In order to configure the system in conditions similar to those
which are foreseen by the design, the circuits operating at low temperature can be roughly calibrated by following the procedure below:
1.  L eave the three-way mixing valve completely open without installing its thermostatic head or motor;
2. Open the secondary balancing by-pass completely;
3. Check whether the boiler water reaches the set temperature;
4. Allow the water to circulate through the system, checking the output temperature value on the output thermometer.
Three different situations may occur:
A. the output temperature is equal to that which is foreseen by the design ⇒ in this case the calibration is complete;
B. the output temperature is less than that which is foreseen by the design ⇒ in this case, slowly close the secondary balancing by-pass until the
C. the output temperature is higher than that which is foreseen by the design ⇒ in this case, if possible, reduce the temperature which has been
1. Installing the mixing valve's control device
The MULTIMIX unit allows for both fixed point adjustment by means of the thermostatic head, as well as
for modulating electronic adjustment by means of the motor. These devices command the mixing valve
in such a way so as to ensure that the configured output temperature is reached. The thermostatic head
(2) or motor (3) is positioned in correspondence to the three-way mixing valve (1), as shown in Figure 5.
• In the case of fixed point adjustment, the head's immersion temperature sensor (4) must be
positioned within the appropriate sensor lodging (5). The thermostatic head T5011U comes sup-
plied with the MULTIMIX versions with product codes containing the letter "T" (ex. 506285PTC).
• In the case of electronic control, the contact temperature sensor must be fixed directly to the out-
put manifold or to the output tube (if metal), as specified in the climate control unit's manual. The
MULTIMIX versions with product codes containing the letter "M" "ex. 506285PMC) are predisposed
for modulating adjustment by means of a servomotor (see Table 3), not included with the system.
Refer to Tables 5-a and 5-b for the proper selection of the climate control units based on the type of
application.
2. Adjusting the secondary balancing by-pass
The mixing kit's secondary balancing by-pass is equipped with a double micrometric adjustment
with position recall in the event of temporary closure. In order to properly adjust and balance the
circuit, proceed as follows.
1. Remove the cap with the safety seal;
2. Use a screwdriver to unscrew and extract the notched screw located within the hexagonal
key-way;
3. Use a 5mm allen key to close the large adjustment screw (Figure 6-a);
4. Screw the notched screw all the way back in. Next, mark the adjustment reference
5. point with an "x" (Figure 6-b);
6. Align the screwdriver with the "x". Next, loosen the screw for the proper number of turns,
(Figure 6-c) based on the relative secondary by-pass diagram shown in the appendix (Figure
M3), where the number of turns is that of the micrometric screw;
7. Open the large screw completely (Figure 6-d). Now the pre-adjustment has been set and will
not be altered in case of repeated opening and closing with the allen key.
8. Cover the by-pass again with its cap.
Adjusting the circuits
The adjustment and balancing of the individual heating circuits, whether high or low temperature,
is to be performed directly upon the manifolds. Consult Table 4 for the selection of the manifold kit
which is most suitable for your needs and refer to the respective kv diagrams for the optimal balan-
cing of the distribution circuits.
Table 4. Distribution manifolds.
System typology
High temperature
Radiant
EN
Series Description
CS Manifold kits with preinstalled fittings and supports.
Adjustment (output) and interception (return)
manifold kits.
CI
Adjustment manifold kits with FLUXER flow (output)
and interception (return) meter.
output temperature establishes itself at the design temperature;
set on the boiler and continue with the calibration process.
Table 3. Axial servomotors.
Art.
NRV 230 501008 230 V
SRV 24
NRV 24
Art.
CS 512N, CS 513N,
CS 523N
CI 562MN, CI 562CN,
CI 594MN, CI 594CN
CI 600N, CI 601N
Cod. Size
501267 24 V/ 0-10 V
501266 24 V/ 0-10 V
Figure 5
Figure 6