4.3 Intermittent chimney fan operation (120 V)
The control can be interlocked with an appliance in two ways:
It can be interlocked directly with an appliance control, or with a dry set of contacts.
Interlock with Burner
Figure 8 shows how an appliance control signal (10-230V AC/DC) is connected to the MEC24:
y Connect the power supply to terminals 1, 2 and 3.
y Connection to the appliance:
Connect the boiler start signal to terminals 12 and 13
The start signal to the burner is now activated by terminal 14.
Connect Neutral to terminal 15.
y To connect the chimney fan:
If using a 1x120V chimney fan, connect it to terminals 4, 5 and 6. Refer to the fan’s Installation manual.
If using a 3-phase fan and VFD, connect the VFD to terminals 20 and 21 as shown in Fig. 10 and 11.
DO NOT connect the fan directly to the MEC24 control.
y The XTP-transducer is connected to terminals 22, 23 and 24.
XTP2
COM Vout Vin
Connection to 120 V Fan - Intermittent Operation
1 x 120V AC
Fig. 8
10
3120066 MEC24 US 20210325
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