HydroStat User Guide

14
MAINTENANCE
Remove the Electro-Well from the heating system every five years and clean any scale or sediment deposits from all parts that are
exposed to the boiler water. After cleaning, reinstall the well using pipe sealing compound. Teflon tape is not recommended.
TROUBLESHOOTING
Temperature Display Exceeds
High Limit Setting
Under normal operation, boiler temperature will continue to rise after the control shuts off
the burner. This condition, known as “thermal stacking”, results from hot boiler surfaces
continuing to release heat into the boiler water.
No or Insufficient
Domestic Hot Water
For boilers equipped with a tankless coil, make sure the low limit setting on the HydroStat
is set properly. NOTE: If the low limit setting is dialed fully counter clockwise, it will shut off
the low temperature maintenance feature and will function as a cold start control. If
installed with an indirect water heater, verify that the end switch in the relay box controlling
the indirect water heater is connected to the DHW terminals. This will ensure that the
domestic water calls are prioritized.
Low Water Light
(Red LED) is On
or Blinking
WARNING: A low water condition is a serious and potentially
dangerous condition. Do not attempt to add water to a hot boiler.
Allow the boiler to fully cool before adding water.
When Installed on an Electro-Well™
When the LOW WATER light is on, this indicates that the control is not detecting water in
the boiler. When the LOW WATER light is blinking, this indicates that the control has been
programmed to provide low water lock-out protection and is currently locked out (see
Manual Reset Low Water Cut-Off on page 10). Pressing the TEST/SETTINGS button
after the low water condition is resolved will reset the lock-out condition.
1. If the light is on and the heating system is filled with water, pull the sensor out of the
well and inspect it. Make sure that the metal clip is protruding enough to come in
contact with the inside of the well tube. Check that the well does not have excessive
build-up of heat transfer grease that may interfere with the clip contacting the well.
2. Remove well and examine for excessive residue build-up. Clean and re-install.
When Installed on a Standard Immersion Well
If either LWCO LED lights are illuminated and the control is installed on a standard
immersion well, this is a false reading caused by a loss of continuity between the sensor
and the inside of the well tube. It is recommended when the control is installed on a
standard immersion well, set option 8 to
b (see page 13 for details).
Boiler Will Not Maintain
Low Limit Temperature
Check for overlapping high temperature setting. If the high limit setting is set below the
low limit setting, the control will default to the high limit setting and the corresponding
high limit differential setting.
House Will Not Get
or Stay Warm
1. Check for air-bound radiators.
2. Check thermostat settings including heat anticipator settings (common on non-digital
thermostats).
3. Check the Economy setting. The Economy feature, much like outdoor reset controls,
lowers average boiler temperature and can slow or, in some cases, prevent the house
from coming up to temperature. Move to a lower setting (see “Setting the Economy
Feature” on page 4).
Heating Circulator Not
Energized on Call for Heat
If the Circulator Hold Off is active (see page 11), check to see that boiler water is at or
above 125°F. On a call for heat, the control will not permit the circulator to operate if the
boiler water temperature is below 125°F.
All LED Lights and Temp
Display are Blinking
If the LED lights and the temp display are blinking alternately, this indicates the control
has sensed a boiler temperature of 250°F. When this occurs, the control pulses the burner
relay and then shuts down and locks out the burner until the temperature falls below
210°F. The system should be analyzed to determine the cause of the overheating condi-
tion. Check that the sensor is inserted all the way into the well so it can accurately sense
the temperature of the boiler water. Check system wiring and operation as well as the con-
trol’s high limit setting. If the cause of the overheating condition cannot be determined, the
control should be replaced.
Snr
in display
Check sensor connection or replace sensor.