7
OPTIONAL FEATURES continued
Circulator Activation Options
When in the default mode, the HydroStat activates the circulator (
C1/C2
contacts) on calls to
T/TV.
The control can be pro-
grammed to activate the circulator on calls to
I1/I2
in place of, or in addition to, calls to
T/TV.
To change how the Circulator is activated
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
4
3. Push the Test/Settings Button to select between the following options:
A
- Circulator on
T/TV
call only
b
- Circulator on
I1/I2
call only
C
- Circulator on both
T/TV
&
I1/I2
calls
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 4)
Circulator Hold Off (Enhanced Condensing Protection)
To reduce the potential for condensing, on a call for heat the control will allow the boiler to heat to 125°F prior to energizing the
circulator. Once energized, the circulator will remain on for the duration of the heating call unless the boiler temperature drops
below 115°F. If this occurs, the circulator will re-energize when the boiler returns to 125°F. Circulator Hold Off will expire after 15
minutes.
To activate Circulator Hold Off
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
5
3. Push the Test/Settings Button to turn Circulator Hold Off
on
or
OFF
4. Reset LO TEMP and HI TEMP settings to desired temperatures (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
Electro-Well is required to activate low water cut-off operation – see page 2 for details). Older wells may contain hardened heat
transfer 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 condition 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 available. 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 10 for more information).
RESTORING FACTORY DEFAULT SETTINGS ON NEXT PAGE