Operation
The control function to three different modes of operation based upon the number of sensors used, or by the mode selected.
The following is a brief explanation of the various modes:
Conventional Mode – Standard configuration (Outdoor Sensor not Detected) – This operation is very similar to a
conventional Triple Aquastat. Upon a call for heat (T-C Jumpered) the boiler maintains the Hi setpoint less the differential
setting. The circulator activates at the low temperature, and deactivates if the water temperature falls 10°F below the Lo
Setting (This establishes a priority for domestic hot water). When there is no call for heat (T-C Open) the burner maintains
the Lo Setting cycling between 10°F below the Lo setting and the diF setting. If the Dif setting is higher than 10°the burner
turns off at (( Lo +(Dif –10)).
Reset Mode – Standard configuration (Outdoor Sensor Detected) – This operation is very similar to Conventional Mode
Except that the control automatically reduces the Hi setpoint based upon the outdoor Air temperature. Upon a call for heat
(T-C Jumpered) the boiler maintains the calculated theoretical Hi setpoint less the differential setting. If the theoretical Hi
setpoint is lower than the Lo setpoint, then the controller will ignore the theoretical Hi setpoint and the burner will operate to
the Lo setting. The circulator activates at the Lo setting, and deactivates if the water temperature falls 10°F below the Lo
Setting (This establishes a priority for domestic hot water). When there is no call for heat (T-C Open) the burner maintains
the Lo Setting cycling between 10°F below the Lo setting and the Dif setting. If the Dif setting is higher than 10°the burner
turns off at (( Lo +(Dif –10)).
ICS Mode – Indirect Cold Start (Caution: This feature is for selected “cold start” boilers only).
Activated by Menu option ICS, select ON to activate. - This operation is very similar to Conventional Mode or Reset mode
depending upon the use of the outdoor sensor. The major difference for ICS Mode is that the burner only fires, when there is
a call for heat or a call for domestic (via an indirect water heater). Upon a call for heat (T-C Jumpered) the circulator
immediately activates, and the burner maintains the theoretical Hi setpoint less the differential setting. Upon a call for
domestic (A-C Jumpered) 120V is switched to Apwire to activate an indirect circulator or valve. The burner maintains the
Lo Setting, cycling between 10°F below the Lo setting and the (Lo + Dif setting). If the water is or falls 10°F below the Lo
Setting the heating pump deactivates, establishing a priority for the domestic hot water.
Example to change LO Default from 180°F to 140°F
Step Press Button Display Shows
1 Normal Cycling
2 Function Run
3 ↓Hi
4 ↓LO
5 Function 180
6 ↓40 times 140
7 Function LO
8 ↓4 times RUN
9 Function Normal Cycling
Important Note:
FLASHING OFF – Indicates that the control was left unattended in
program mode. Pressing Function, ↑, or ↓will resume
programming.
ICS – Not all NY Thermal boiler are compatible with this operation,
ensure unit is rated for Cold Start.
AIR – The AIR temperature will only be displayed if the outdoor air
sensor is installed, and is detected by the controller.
Input State
T-C Open T-C Closed
Condition Domestic Standby Heating
Burner On LO-10 HI-Dif
Burner Off LO+(Dif-10) HI
Heat Circ. ON - LO
Heat Circ. Off - LO-10
Closing A-C terminals, activates Aux. Circ. and provides 120V
out to AP.
Input State
T-C Open T-C Closed
Condition Domestic Standby Heating
Burner On LO-10 HI
Calc. -Dif
Burner Off LO+(Dif-10) HI
Calc.
Heat Circ. ON - LO
Heat Circ. Off - LO-10
Closing A-C terminals activates Aux. Circ. and provides 120V
out to AP.
** Note: If the calculated HI Setting is less than the LO setting,
the LO will be used in place of the HI setting.
Determining Reset Temperature HICalc
Once the control identifies the presence of a good outside
sensor, the control will automatically reduce the HI setting,
based upon the outdoor temperature. The calculated HI
setpoint (HICalc ) is calculated as follows:
Example: Hi=205, Air Temperature=32
RESET RATIO
= (High Setting - 70)/70
= (205 - 70) /70
= 1.92
RESET TEMPERATURE HICalc
=[(70-Outdoor Air) x Reset Ratio] + 70
=[(70-32) x 2.00] + 70
=[73] + 70
=143.00°F
