HydroStat User Guide

12
OPTIONAL FEATURES continued
Low Limit Setting
The HydroStat IC control can provide Low Limit functionality for boilers equipped with tankless coils. When activated, the control
will operate the burner to maintain the selected temperature in the boiler at all times.
To activate the Low Limit feature
1. Turn the PROGRAM / LO TEMP dial clockwise to enter the Program Mode –
The display will read
Pro
2. Turn the HI TEMP dial to select feature 7
3. Push the Test/Settings Button once. The display will show on indicating that the function is now ac-
tivated (Note: Pushing the button a second time will turn the feature OFF).
4. Adjust the PROGRAM/LO LIMIT dial to set the desired Low Limit temperature you want the boiler
to maintain. Note: The Low Temperature setting range is 110˚- 220˚F. It should be at least 10˚
lower than the Hi Limit setting.
DANGER: Scald Hazard – Exposure to 125°F or hotter water can cause scalding injuries. A
mixing valve should be installed on installations where point of use water temperatures are
125°F or higher.
5. Reset the HI TEMP settings to the desired temperature (see page 4)
Setting the Well Type (Electro-Well vs. Standard Immersion Well)
When used to replace older temperature-only controls, the HydroStat can be installed on the existing well. (The Hydrolevel Elec-
tro-Well is required to activate low water cut-off operation – see page 2 for details). Older wells may contain hardened heat trans-
fer grease or other contaminants that could interfere with metal-to-metal continuity between the sensor head and the inside of the
well. Insufficient contact could lead to false low water conditions and burner shut downs. Setting the well type to Standard Well
prevents the possibility of this occurring.
To change the well type
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature 8
3. Push the Test/Settings Button to select A for Electro-Well or b for Standard Well.
NOTE: To ensure that the low water cut-off is always active when the control is installed on an Electro-Well, setting b will ONLY be available when
installed on a standard well. The Hydrostat sensor checks to determine if a standard well is used by looking for low resistance to ground, a condi-
tion that can only exist with a standard well. If you are installing on a standard well and either Low Water LED’s are on, setting b will not be avail-
able. Check to see if the inside of the well tube is badly oxidized or contaminated with heat transfer grease. It may be necessary to clean the well
to allow for setting b to be selected (See Troubleshooting Guide on page 14 for more information).
High Limit Differential
When the Economy feature is on, the control’s Thermal Targeting feature actively sets varying differentials based on system con-
ditions. Alternately, if an operator prefers to set a fixed differential, this option allows for selecting a 10, 20 or 30 degree differential
when the Economy feature is turned OFF. These optional differential settings are subtractive from the HIGH LIMIT setting.
Note: If the Economy feature is on, this setting will be overridden by the control's Thermal Targeting function.
To change the high limit differential
1. Turn the LO TEMP dial to access the Program Mode –indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature 9
3. Push the Test/Settings Button to select a high limit differential of 10, 20, or 30
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 4)