Specifications

EKO BOILER MANUAL

Filling the Boiler and Heating System.

Plain water is the recommended uid for lling the EKO boiler and system it is connected to. The

easiest way to ll the boiler and heating system is through a regulator connected to the home’s do-

mestic water supply. The regulator steps the pressure down to 12 psi, so that the boiler can be lled

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 lled. The advantage to leaving it open is that 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 disadvantage to leaving the water connection open is that tap water

contains oxygen, which will corrode the boiler and other components over time if enough oxygen is

routinely let in, say by a leak.

If the use of glycol is desired for freeze protection, be sure to use non-toxic hydronic heating system

antifreeze, available from plumbing and heating supply outlets. Follow the directions carefully. The

use of automotive glycol is not recommended, in part because it is toxic and can present a serious

public health risk under some circumstances. For that reason, it is against code to use automotive

glycol in hydronic heating systems connected to a public water supply.

Connecting a Pump and Room Thermostat to the Controller

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. It is always a good idea to check with your EKO dealer or

distributor to determine the proper connections for your system.

UM-1 Module Connection Scheme

RK-2001UA Connection Scheme