The selection of the correct ratio depends on the initial temperature Set Point set on screen 02 and the desired system water temperature. If the building is too cold, increase the ratio value. After changing the ratio, wait several days and evaluate the comfort level before making another change.
NOTE: This information works the same in °C (not shown for clarity).
Advanced Programming Feature
Line 2 may be modified by inserting the building design characteristics into the formula. The Reset Ratio will be modified to reflect those characteristics.
System Status:
To show the status of other boilers in the system, push either the "LEFT" or "RIGHT" button. If the controller is in a fault condition, the boiler number can be displayed automatically.
NOTE: The alarm horn can be silenced by pushing the mode button.
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| Screen number |
S | Y | S | T | E | M | S | T A | T U | S | 0 7 |
S | Y | S | T | E | M | N | O R | M A | L |
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If more than one ERROR, all errors will be displayed in sequence.
ERROR Indications:
Message
Meaning
NO SAFETY SIGNAL | Safety signal (24VAC) not present on J7 connector |
NO CFH SIGNAL | |
WATER TEMP>MAX | System water temp > Maximum allowed temp |
ILS>OLS | Inlet water temp > Outlet water temp |
SYS IS OPEN | System water sensor or cable/connector is open |
SYS IS SHORT | System water sensor or cable/connector is shorted |
OLS IS OPEN | Outlet water sensor or cable/connector is open |
OLS IS SHORT | Outlet water sensor or cable/connector is shorted |
ILS IS OPEN | Inlet water sensor or cable/connector is open |
ILS IS SHORT | Inlet water sensor or cable/connector is shorted |
OSS IS OPEN | Outdoor air sensor or cable/connector is open |
OSS IS SHORT | Outdoor air sensor or cable/connector is shorted |
| Table I: Error Indications |
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