Page 35
8.D Restore Factory Default Settings
To restore advanced settings, to factory default settings
(see Table 8 on page 33 for all program settings).
1. Turn the Advanced Programing dial to access the
Program Mode – indicated in the display as Pro.
2. Turn the HI LIMIT dial to select feature dEF.
3. Push the Mode button to Y to reset all features to the
default settings.
4. When finished, turn the Advance Programing dial
back to OFF. ,
5. Reset Economy to 1 for default.
6. Reset HI LIMIT setting to 190 for default.
8.E View Current Settings
The Mode button has several functions when
programing the boiler. When used by itself, it has the
function of scrolling through and displaying the current
settings.
Push the Mode button consecutively and you can stop
on any one of the 5 current settings listed in Figure 36
(1 thru HI)
Figure 34. Economy Settings
Boost
Interval
Boost
Temp
On
Differential
8.F DHW Functionality
During a call from an indirect water heater, the control
will de-energize the System Pump contacts to heat
only the indirect tank, ensuring an adequate supply of
domestic hot water. The control will target the high limit
setting and override Economy and Reset Ratio settings
and WWSD settings. The control will re-energize the
System Pump when the indirect tank is satisfied or if the
boiler temperature reaches 170°F. This feature will allow
the boiler to heat both demands from 151°F up to the
high limit, until the calls are satisfied. If the indirect call
continues for 45 minutes, the control will then override
the priority function, energizing the System Pump to
provide space heating.
Figure 35.
Mode Button
7
TEMP ACTIVE
Indicates that the Fuel Smart
HydroStat control is powered and that the temperature
function is active.
TEMP HI TEMP
Illuminates when the boiler water
temperature reaches the high limit setting. It will remain lit
until the water temperature falls 10°. The Fuel Smart
HydroStat prevents burner operation while this LED is on.
See Differential explanation
LWCO ACTIVE
Indicates that the low water cut-off
(LWCO) function of the control is active.
The JX comes standard with an Electro-Well which works
as both a standard well and a Low Water Cut-off probe.
IMPORTANT: If the control is installed with a well other than
the Electro-Well, this LED will not illuminate indicating that
the control is not providing low water cut-off functionality.
LWCO LOW WATER
Indicates that the boiler is in a
low water condition. The control will prevent burner
operation during this condition. If the LOW WATER light is
blinking, the control has been programmed to provide lock-
out protection in the event a low water condition is detected
See Manual Reset Low Water Cut-Off
IMPORTANT: The system must be checked by a qualified
heating professional prior to resuming operation.
WARNING: ALLOW THE BOILER TO FULLY COOL
BEFORE ADDING WATER.
ECONOMY ACTIVE
Indicates that the Thermal
Targeting function is active and the control will
reduce boiler temperature to conserve fuel. The Economy
feature is activated using the ECONOMY dial. (See “How
Thermal Targeting Works”
ECONOMY TARGET
When the Economy feature is
active, the control continually sets target
temperatures below the high limit setting to maximize fuel
efficiency. When the boiler water reaches the target
temperature, the LED illuminates and the burner will shut
down. The boiler water will continue to circulate and heat the
house as long as the thermostat call continues. The LED will
stay lit until the boiler temperature drops below the differential
set point at which point the boiler will be allowed to fire again.
See Differential explanation
NOTE: This LED illuminates regularly during normal boiler
operation.
TEST/SETTINGS Button
To Test Low Water Cut-Off: Press and hold the Test/
Settings button for 5 seconds. The display will read LCO.
LWCO TEST
LCO
0
The red Low Water light should illuminate and the burner
circuit should de-energize. NOTE: The control must be
installed with a Electro-Well for low water cut-off
functionality.
LOW LIMIT SETTING
LL
HIGH LIMIT SETTING
HL
ECONOMY SETTING
ECO
FLAME CURRENT
FLA
CURRENT TARGET TEMP
ooo
The display will return to boiler temperature (default) if
Mode
button in not pressed for 5 seconds.
NOTE: Flame Current reading will remain in the display for
30 seconds to allow for pilot adjustment
LED LEGEND and TEST/SETTINGS BUTTON
Figure 36. Toggle through Current Settings
The display will return to the boiler temperature (default)
if the Mode button is not pressed for 5 seconds.
Factory Setting
Example: If the thermostat is not satisfied thirty
minutes after the boiler reaches the reset temperature,
the control will boost the reset temperature by 10
degrees. It will continue to boost, until the call for heat
is satisfied.
8.C.4.b Thermal Targeting
If in Economy mode, the Thermal Boost is increased to
various intervals depending on your chosen setting.
See Figure 34
Example: Thermal Targeting: Economy
Monitors thermostat activity to adjust the boiler
temperature to the minimum output required to meet
heating load.
Thermal Boost:
Boosts in 10 degree increments at timed intervals
Up to Hi- Limit setting.
Auto-Reduce:
Reduces 5 degrees with every new call
Reduces 5 degrees every 30 minutes of no demand
M
INI-
T
HERM
JX
Residential Boilers
®
