Laars MagnaTherm HTD Series Installation And Operation Instructions Manual page 124

Page 120
Condition Information
•
Flow Switch
Insufficient flow at the outlet of the
boiler/heater
•
Auto-reset Condition
•
Annunciation – "Warning Flow switch open"
on Message Screen
•
Low Water
• Insufficient water level in the boiler/heater
Outlet
Dual element sensor readings do not
Cut Off
heat exchanger.
Sensor Drift
agree.
•
• Manual-reset Condition
Manual-reset Condition
•
• Annunciation – on Navigation Bar
or
Annunciation – on Navigation Bar
Lockout: Low Water Cut Off
Flue
Sensor Drift
•
Manual Outlet water temperature has exceeded the
Reset High
manual reset high limit setting
•
Limit
Manual-reset Condition
•
Annunciation – on Navigation Bar
Lockout: Man Reset High Limit
•
Auto Reset
Outlet water temperature has exceeded the
High Limit
auto reset high limit setting
•
Auto-reset Condition
•
Annunciation – "Warning High limit auto
error" on Message Screen
•
Inlet Sensor
Inlet sensor is damaged or not connected.
•
Pressure •
Pressure transmitters are not measuring the
Manual-reset condition
Transmitter
• same values.
Annunciation – on Navigation Bar
Lockout: Air Pressure Drift Error
•
Pressure
Pressure not within bounds
Transmitter
Lockout: Burner AN Pressure ERR
•
High Gas
The high gas pressure switch has tripped
•
Pressure
Manual-reset Condition
•
Burner
Sensing flame on burner prior to ignition.
•
Annunciation – on Navigation Bar
•
Parasitic
Manual-reset Condition
Lockout: High Gas Pressure
•
Flame
Annunciation – on Navigation Bar
•
Low Gas
The low gas pressure switch has tripped
•
Pressure
Manual-reset Condition
•
Burner Max
The maximum attempts for ignition has
•
Annunciation – on Navigation Bar
Trials
occurred, without sensing flame.
• Lockout: Low Gas Pressure
Manual-reset Condition
•
Annunciation – on Navigation Bar
•
Condensate
Condensate trap water level is high
•
Level
Auto-reset Condition
•
Annunciation – "Warning Condensate level"
•
Additional
Outlet water temperature has exceeded the on Message screen
High Limit
additional high limit setting
•
Outlet
Outlet probe is not connected
•
Auto-reset Condition
•
Sensor
Manual-reset Condition
•
Annunciation – "Warning Additional high
•
Annunciation – on Navigation Bar
limit" on Message Screen
Lockout: Outlet Probe
Lockout: Outlet Probe Drift
Lockout: Flue Probe Drift
Lockout: Inlet Probe
Lockout: Burner Parasitic Flame
Lockout: Burner Max Trials
LAARS Heating Systems
Corrective Action
•
Faulty boiler/heater pump – replace pump.
140
•
Faulty pump contactor – replace contactor.
158
•
Blown boiler/heater pump fuse – replace fuse F14 on the
176
control board.
194
212
•
• Reset the LWCO from the reset button on the LWCO module.
Check the sensor and wiring. Repair or replace as needed.
•
• Verify the system is full of water and all air has been purged
The outlet probe is a dual element probe with 10K and 20K
from the system.
thermistors. A quick test is to measure resistance and verify
•
Check for loose jumpers if the LWCO is not installed.
one resistance is double the other. Replace if necessary.
•
Measure the resistance of each element of the sensor and
compare to the resistance table below. Replace if necessary.
•
Verify the system is full of water and all air has been purged
from the system.
Resistance (Ω)
Temp (°F)
•
Verify the boiler/heater is piped properly into the heating
68
system.
86
•
Check for proper pump operations.
104
•
Check the manual reset high limit set point.
122
•
Verify the system is full of water and all air has been purged
140
from the system.
158
•
Verify the boiler/heater is piped properly into the heating
176
system.
194
•
Check for proper pump operations.
212
•
• Check the manual reset high limit set point.
Check the sensor and wiring. Repair or replace as needed.
•
•
Check the wiring connections at transmitters and BIC (x122)
Measure the resistance of the sensor and compare to the
•
VCC to Ground should equal 5 Volts.
resistance table below. Replace if necessary.
•
Check pressure levels on Analog IN screen. Replace faulty
transmitter.
Temp (°F) Temp (°C)
•
Check that pressure sense lines are not kinked or
68
disconnected.
86
•
Check that inlet and exhaust ducts are not blocked.
104
•
Check that blower is rotating during pre-purge.
122
•
Check wiring connections at transmitters and BIC (x22).
140
•
Check that pressure sense lines are not kinked or
158
disconnected.
176
194
•
Refer to Section 3 for Gas Supply and Piping information.
212
•
Verify supply and manifold gas pressures satisfy installation
•
Inspect flame and wiring for damage and continuity. Replace if
requirements.
necessary.
•
Refer to Section 3 for Gas Supply and Piping information.
•
Verify supply and manifold gas pressures satisfy installation
•
Verify supply and manifold gas pressures satisfy installation
requirements.
requirements.
•
Verify the proper intake and venting.
•
Inspect the burner.
•
•
Check pilot and main valve wiring and operation.
Check condensate trap for proper drainage
•
•
Check ignition transformer electrode, flame detector wiring and
Check condensate trap for stuck level switch
position.
•
Verify the system is full of water and all air has been purged
from the system.
•
Check the sensor and wiring. Repair or replace as needed.
•
Verify the boiler/heater is piped properly into the heating
•
The outlet probe is a dual element probe with 10K and 20K
system.
thermistors. A quick test is to measure resistance and verify
•
Check for proper pump operations.
one resistance is double the other. Replace if necessary.
•
Check the additional high limit set point.
•
Measure the resistance of each element of the sensor and
compare to the resistance table below. Replace if necessary.
Resistance (Ω)
Temp (°F)
68
86
104
122
2463 4937
1739 3489
1253 2514
919 1845
685 1376
10K 20K
Resistance (Ω)
12555 25099
8025 16057
5279 10569
3563 7139
2463 4937
1739 3489
1253 2514
919 1845
685 1376
Resistance (Ω)
20 12555
30 8025
40 5279
50 3563
60 2463
70 1739
80 1253
90 919
100 685
10K 20K
Resistance (Ω)
12555 25099
8025 16057
5279 10569
3563 7139