Installation Guide

boiler is closed. Plug in the submersible pump and slowly open both inlet ball
valves on the ball drain valves. Water should now flow through the boiler and
return water and air to the bucket. When the return line is free of air bubbles,
quickly close both inlet ball valves on the ball drain valves. Turn off the pump.
The system is now purged of air.
Disconnect the purge line and replace the drain valves caps. Position the
drain valves 3-way ball valves to the flow through position. Loosen the cap on the
air eliminator vent and open any vent on the boiler. Open the supply water ball
valve. A small amount of water will be added to increase the system pressure to
15 to 20 psi. The system is now completely filled.
9. Connect thermostat and boiler control wiring.
Open the green control box. At the top right is a terminal strip label with
zone 1, zone 2, etc. Using at least 3-conductor (one conductor is a spare) solid
thermostat wire, connect the appropriate zone terminal to the room thermostat.
Make sure to route the wires through the rubber grommet(s) at the top of the
control box.
At the lower left are the X1 and X2 terminals. These connect to the boiler
control circuit. Depending upon local codes additional devices may be wired in
series such as a low water cutout, high temp limit switches, etc. Use at least 3-
conductor (one conductor is spare) solid thermostat wire to make the connection.
Make sure to route the wires through the rubber grommet at the bottom left side
of the control box. Replace the control box cover.
10. Connect to line voltage.
Depending upon local codes, this could as simple as plugging in the
attached cord into an outlet or the cord may need to be hardwired into a junction
box.