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©2009 Eco-Orlan USA LLC. All Rights
Reserved
.
Revised August 2009.
16. Filling the Boiler and Heating System
The recommended fluid for filling the Paxo® boiler and the system that the boiler is connected to is plain water. The easiest way to
fill the boiler and the heating system is through a regulator connected to the home’s domestic water supply. The regulator steps the
pressure down to 12 psi, so the boiler can be filled at the appropriate pressure. This connection to the home water supply can be left
open or closed with a manual valve after the system is filled. The advantages to leaving it open: any water lost is immediately made
up and the system stays full of water at all times, including occasions when the pressure relief valve opens. The disadvantages to
leaving the water connection open: tap water contains oxygen, which will corrode the boiler and other parts over time if enough
oxygen is allowed into the system.
For freeze protection, use only non-toxic hydronic heating system antifreeze, available from plumbing and heating supply outlets and
follow the directions. The use of automotive glycol is not recommended due to its toxic nature and can present a serious public health
risk.
WARNING!
It is against code to use automotive glycol in hydronic heating systems connected to a public water supply.
17. Wiring Schematic for the RK-2001UA Controller and the Module Connections
There are several electrical terminals on the back side of the RK-2001UA controller where a pump and room thermostat can be
connected. Access is through the bottom of the controller housing which is attached to the top front boiler panel with four screws.
There are numbers and graphic symbols indicating the function of the various electrical connections, switches and dials on the bottom
of the controller, as shown in the diagram below.
RK-2001UA Connection Scheme
