EZB-Eco Installation Manual

09/01/2020 15 BI601
OPERATIONAL INFORMATION
Normal heating operation – when there is a heat call from the thermostat (24VAC present on the control
board W-C terminals) the boiler pump will start and three indicator lights will illuminate on the front of
the EZB-Eco:
 Boiler Power, steady green
 Electric Mode, steady yellow
 Thermostat Call, steady red
After a short delay of one minute or less, the EZB-Eco will begin to stage up elements (as indicated by
the four red staging LED’s on the inside control board) in order to reach the desired supply water
temperature. The desired water temperature is set on the front dial or is determined using the front dial
and the outdoor reset curve when the outdoor sensor is connected.
As the EZB-Eco reaches it set point water temperature you may see the boiler stage lights stage off and
quite often you will see stage 1 LED pulse on and off or modulate. This is normal operation for the built-
in WarmFlo controller as it works to maintain constant water temperature as efficiently as possible.
Note: Some model sizes will not require all four stages to control elements; however, the control board
LED’s may show those unused stages active.
190° auto reset high limit – under normal operating conditions the 190° auto reset LED should not come
on. The built-in WarmFlo control of the EZB-Eco should prevent this. However, on a system with very
low water flow or trapped air you will see the 190° auto reset activate. The water within the boiler vessel
must cool by 30° F before the high limit will self-reset.
If you experience auto reset limit trips at initial startup of the EZB-Eco the following items should be
checked:
 System pressure 12 to 20 PSI on boiler gauge
 All ball valves and manifold valves are in the “on” position
 Boiler and system are purged of any trapped air. Loosen air bleed cap on the top of the air
eliminator.
Boiler water temperature – with a thermostat heat call, the EZB-Eco will try and achieve a temperature set
point. The time it takes to reach set point will vary depending on conditions of the system. When operating at
the recommended flow rate (GPM per kW) you should see an approximate 20° difference between return
water and supply water temperature. On a cold start up with return water temps below 60° F, it could take a
few hours for the boiler to reach a set point above 80° F. Adjusting the set point dial to a higher temperature
during a cold startup will have little or no effect since the boiler cannot exceed a 20° increase in temperature
from return to discharge.
Once the return water temperature starts to increase you will start to see an increase in outlet temperature.
This will continue until the outlet temperature reaches the desired set point, at which point the WarmFlo
control will stage and modulate elements to hold that temperature.