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7 - INSTALLATION - Indirect storage tank connections
1 Outdoor temperature sensor (optional)
2 120Vac electrical supply
3 Heating system supply circuit
4 Room thermostat (fi eld supplied)
5 Heating circuit drain valve (fi eld supplied)
6 Boiler
7 -
8 Three way valve (fi eld supplied)
9 Gas supply
10 Manual gas shutoff valve (fi eld supplied)
11 -
12 - Expansion vessel (if the inside one is not suffi cient)
13 Automatic fi ll valve (fi eld supplied )
14 Cold water inlet connection
15 Indirect storage tank (fi eld supplied)
16 Domestic hot water outlet
17 Domestic cold water inlet
Figure 17 -
Indirect storage tank connections
7.1 - Connecting the
boiler to an indirect
storage tank
This boiler, can be connected to an indirect
storage tank as follows (the water and
electrical connections must be made per
fi gure 17): To make the electrical connections,
follow the steps below while refering also to
fi gure 17:
1. disconnect the boiler from the electrical
supply;
2. remove the boiler casing according to the
instructions given in section 13.2;
3. push the plastic spring tabs "B" shown in
fi gure 18;
4. open the front half of the electrical box in
the "C" direction as shown in fi gure 18;
5. move switch #1, item "D" in fi gure 18, to
its "ON" position as marked on the control
board;
6. ensure that switch #5 is in the OFF position;
7. on the rear side of the electrical junction
box board, if present, disconnect the plug
with two wires (see fi gure 18, item "E"),
corresponding to wires #44 and #45.
8. on the rear side of the electrical box,
disconnect the plug from the diverter
valve (see fi gure 1, item "35"). When you
disconnect the plug you must be sure the
boiler is doing heating. If you are not sure,
light the boiler ON, wait the display show
"F" and then light-off the boiler. Now you
can disconnect the plug from the diverter
valve.
9. use a # 18 AWG two wire cable to connect
the indirect storage tank temperature
sensor to terminals "TS", item "M", as per
fi gures 14 and 15;
10. insert the probe of the tank temperature
sensor into the socket of the storage tank.
11. use a #18 AWG four wire cable to connect
the three way valve to terminals "1", "2",
"3" and Ground as per fi gures 14 and 15,
where:
"1" = 120Vac Line for domestic side
"2" = Neutral
"3" = 120Vac Line for heating side
WARNING!!! Since the indirect storage
tank temperature sensor wires conduct
24 Vac, they must never be run through
conduits containing 120 Vac power wires
or an electrical shock hazard will exist.
WARNING!!! Once the boiler is connected
to an indirect storage tank, it will perform
a weekly antilegionella cycle. This cycle
raises the storage tank temperature to
140°F one time per week.
24
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