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sensor Inputs
display shows sensor open or sHort
When OPEN, Check the sensor is connected and the wires are continuous to the SQ-Elite.
Finally follow the procedure for Incorrect Temperature or Pressure Display. When SHORT
Remove the wires from the sensor terminals. The display should change to read OPEN. If it
does not, the SQ-Elite may be damaged.
display shows an Incorrect temperature
Remove the wires from the sensor terminals. The display should change to read OPEN. If it
does not, the SQ-Elite-8S may be damaged. Take an ohm reading across the detached sensor
wires. The ohm reading should correspond to the Temperature sensor Table. If it does not, the
sensor may be damaged.
display shows an Incorrect pressure
If the reading is a specified amount above or below the actual pressure adjust it using the
System Trim. If reading is SHORT, remove the wires from the sensor terminals. The display
should change to read OPEN. If it does not, the SQ-Elite-8S may be damaged.
control operatIon
too Much Heat
Check if the control has any of the following:
•
B oiler Mode Settings - The SQ-Elite will only sequence boilers their mode is set to Auto or
Standby. Make sure non of the boilers have their Mode set to ON.
•
C ontrol Settings - The Last Stage Hold will allow only the Lead boiler to exceed the set point.
If the setting is too high, and only the Lead boiler is on, the system can overshoot. Reduce the
Last Stage Hold setting.
too little Heat
Check if the control has any of the following:
•
S etback and Day/Night Schedule - If reduced heat occurs only during specific hours, check the Day/Night Schedule and the
Setback value.
•
B oiler Mode Settings - The SQ-Elite-8S will only control boilers their mode is set to Auto or Standby. Check if any boilers have
their Mode set to Manual, Off, or Standby.
boilers are short-cycling
•
M inimum Runtime - Increase the Minimum Runtime only if all boilers tend to short-cycle.
•
L ast Stage Hold - Increase the Last Stage Hold only if the lead boiler tends to short-cycle.
system is overshooting or oscillating
•
R eaction Time and Minimum Runtime - If the system is overshooting, increase the Reaction Time. This will allow the stages
enough time to respond before bringing on another stage. However, if the system was oscillating, increase the Reaction Time and
the Minimum Runtime.
•
P ID vs OSS - If the application the system is used on requires fast response that the normal PID mode cannot provide, try using
the OSS mode and adjust the Throttle Range according to the system requirements.
SQ-Elite-8S & SQ-Elite-EXT Installation Manual
troublesHootIng
temperature sensor table
teMperature
value
(in degrees °F)
(in ohms)
-30
117720
-20
82823
-10
59076
0
42683
10
31215
20
23089
25
19939
30
17264
35
14985
40
13040
45
11374
50
9944
55
8714
60
7653
70
5941
80
4649
90
3667
100
2914
110
2332
120
1879
130
1524
25
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