Laars OMNITHERM ONH1250, Инструкции по сборке, установке и эксплуатации

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Page 115
Condition Information Corrective Action
Stack
Sensor
•
Stack sensor disconnected
•
Stack sensor wiring bad
•
Thermistor elements bad
•
Check the sensor and wiring.
Repair or replace as needed.
•
The stack probe is a dual
element probe with 100K
thermistors. Measure the
resistance of each element
of the sensor and compare
to the resistance table below.
Replace if necessary.
Temp
(°F)
Temp
(°C)
Resistance
(Ω)
32 0 334000
50 10 201660
68 20 125500
77 25 100000
86 30 80220
104 40 52590
122 50 35270
140 60 24160
158 70 16870
176 80 12000
194 90 8674
212 100 6369
248 120 3581
284 140 2117
320 160 1307
356 180 839
392 200 558
428 220 382
464 240 269
500 260 194
536 280 143
Flow Switch
•
Auto reset condition
• Annunciation – “Flow switch error”
on Message Screen
•
Verify the system is full of water
and all air has been purged from
the system.
• Verify the boiler/heater is piped
properly into the heating system.
• Check to see if the pump is on
and rotating in the proper
direction.
• Confirm all ball valves are open
•
Check wiring to the flow switch
•
Check flow switch operation to
confirm paddle movement and
switch operation.
Lockout: Stack Sensor Probe
Lockout: Stack Sensor Drift
The
O
MNI
T
HERM