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Tankless Coil Boiler Application - Priority Figure 3a.
Opera�on:
When any thermostat calls for
heat, the boiler is given a signal to start. The
appropriate circulator is energized only when
the boiler temperature is above the low limit.
Priority Opera�on:
switched to the priority se�ng and is ac�vat‐
ed, all other zones will stop opera�on un�l
zone 6 is sa�sed. When Zone 6 is not
switched to priority, all zones will operate
independently.
When Zone 6 is
Jumper Placement:
between terminals ZC and ZR. Connect termi‐
nal ZC to ZC terminal on the aquastat control.
Connect terminal ZR to ZR terminal on the
aquastat control. Conrm polarity is con‐
sistent between the boiler aquastat and the
switching relay.
Power input:
Connect 120 volt as power
input to terminals N and H. Neutral wire to
terminal N. Hot wire to terminal H.
13
REMOVE the jumper
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