BOILER SEQUENCING CONTROL User Manual

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BSC Installation and Operation Manual

TROUBLESHOOTING

No Display, or Garbled Display

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that the Ground screw is connected to a reliable Earth Ground. Make sure that all wiring is fed

to the control through the bottom knockouts and that no high voltage wiring is running behind

the control board.

SENSOR INPUTS

Display shows Sensor OPEN or SHORT

When the reading is OPEN, Check the sensor is connected and the wires are continuous to the

BSC. Finally follow the procedure for Incorrect Temperature or Pressure Display. When the

reading is SHORT , remove the wires from the sensor terminals. The display should change to

read OPEN. If it does not, the BSC 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 BSC 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

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Trim. If the reading is SHORT, remove the wires from the sensor terminals. The display should

change to read OPEN. If it does not, the BSC may be damaged.

CONTROL OPERATION

No Heat

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relays unless the Prove is shorted. Check Message Display Line on page 12.

 6KXWGRZQ- The BSC will activate stage outputs when the Shutdown terminals are short. Check

Message Display Line on page 12.

 6HQVRU)DXOW- When the Sensor Fault is set to Shutdown in the startup menu on page 7, the

System sensor fault (in all Sensor Type modes) or the Outdoor sensor fault (in Reset mode) will

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 6\VWHPRU2XWGRRU6HQVRU- If the System or Outdoor sensor reading was higher that the

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Too Much Heat

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 5HVHW5DWLRDQG2IIVHW- If excessive heat occurs only in certain weather conditions, adjust the

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 %RLOHU0RGH6HWWLQJV- The BSC will only modulate boilers their mode is set to Auto or Standby. Check to if any boiler stage is set

to Manual or On. See Mode on page 24.

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Temperature Sensor Chart

TEMPERATURE

(in Degrees °F)

Value

(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

140 1243

150 1021

160 842

170 699

180 583

190 489

200 412

210 349

220 297

230 253

240 217

250 187

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User Manual - Page 30