Connect a 120VAC / 15 amp supply to the "AC IN" tagged leads in the wiring box. The maximum
actual draw (with 5 typical residential size pumps) is less than 4 amp.
3.13.2.1 Load pumps
The 120 VAC power supply to the load pumps (P/V1, P/V2, P/V3, and P/V4) has been factory
installed and connected to P/V-L and P/V-N for your convenience. The upper 4 pairs of contacts on
this green connector strip are then powered to manage up to 4 load pumps – the top pair for Load 1,
the second pair for #2 etc. Once the controller is programmed for the respective loads, the boiler
manages all the loads without need of further relays (for loads up to 1/3 HP for more – use a
protective relay).
3.13.2.2 Boiler pump
The boiler (primary) pump is powered by the white/yellow wire from the pair labeled "Boiler Pump".
This lead is factory wired to the controller (and its 120 VAC supply) at the upper right backside of the
controller board. Do not attempt to connect the primary pump to the Pump/ Zone Valve Terminal
Block along the controller’s right edge - this is for the secondary pumps and/or zone valves only.
Connect the pump’s Black wire to the Yellow of this pair (switched Hot). The White/ Yellow pair
should be individually capped if the primary pump does not obtain its power from this pair (e.g. if a
variable speed primary pump is connected to the mains power).
Pumps can be switched on/off using the touchscreen controller, so there is no need for temporary
pump wiring during system filling / air purging.
The combined current of all load pumps connected through the on-board pump relays should not
exceed 10 amps. The control circuit board is protected using on-board field replaceable fuses. Each
pump is fused with a separate 5 Amp fuse. The Alarm contact is fused with a 5 Amp fuse and the
24VAC boiler control circuit is protected with a 2 Amp fuse.
The VS output leads are not commonly used except when providing a variable speed signal to the
fan in an IBC air handler.
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