Bell & Gossett 210668B Z-4M - Manual (Page 6)

Display Fault Notes
OUTDOOR The control is no longer able to read the outdoor sensor due to an open circuit. In this
SENSOR OPEN case, the control assumes an outdoor temperature of 32°F (0°C) and continues operation.
CIRCUIT Check wiring between outdoor sensor and control unit. Verify all connections and inspect
for broken wire or damaged sensor. To clear the error message from the control after
the sensor has been repaired, press the Item button
BOILER The control is no longer able to read the boiler sensor due to a short circuit. In this
SENSOR case, if the BOIL MIN adjustment is set to OFF the control does not operate the Boiler
SHORT contact. If the BOIL MIN adjustment is not set to OFF and a boiler demand is present,
CIRCUIT the Boiler contact will operate for up to 10 minutes of a 20 minute cycle. Check wiring
between outdoor sensor and control unit. Verify all connections and inspect wire
insulation and sensor for damage. To clear the error message from the control after
the sensor has been repaired, press the Item button
BOILER The control is no longer able to read the boiler sensor due to a open circuit. In this
SENSOR case, if the BOIL MIN adjustment is set to OFF, the control does not operate the Boiler
OPEN contact. If the BOIL MIN adjustment is not set to OFF, and a boiler demand is present,
CIRCUIT the Boiler contact will operate for up to 10 minutes of a 20 minute cycle. Check wiring
between outdoor sensor and control unit. Verify all connections and inspect wire
insulation and sensor for damage. To clear the error message from the control after
the sensor has been repaired, press the Item button
MIX SENSOR The control is no longer able to read the mixing sensor due to a short circuit. In this
SHORT CIRCUIT case, the control will operate the injection pump at a fized output as long as there is a
mixing demand. Check wiring between sensor and control unit. Verify all connections
and inspect wire insulation and sensor for damage. To clear the error message from the
control after the sensor has been repaired, press the Item button
MIX SENSOR The control is no longer able to read the mixing sensor due to a open circuit. In this
OPEN CIRCUIT case, the control will operate the injection pump at a fized output as long as there is a
mixing demand. Check wiring between sensor and control unit. Verify all connections
and inspect wire insulation and sensor for damage. To clear the error message from the
control after the sensor has been repaired, press the Item button
Mix Reset Fault Messages (continued)
Sensor Resistance Chart
VIEW OUTDR
VIEW
BOIL
VIEW
BOIL
VIEW
MIX
VIEW
MIX
Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance
°F °C ⏲ °F °C ⏲ °F °C ⏲ °F °C ⏲
-50 -46 490,813 20 -7 46,218 90 32 7,334 160 71 1,689
-45 -43 405,710 25 -4 39,913 95 35 6,532 165 74 1,538
-40 -40 336,606 30 -1 34,558 100 38 5,828 170 77 1,403
-35 -37 280,279 35 2 29,996 105 41 5,210 175 79 1,281
-30 -34 234,196 40 4 26,099 110 43 4,665 180 82 1,172
-25 -32 196,358 45 7 22,763 115 46 4,184 185 85 1,073
-20 -29 165,180 50 10 19,900 120 49 3,760 190 88 983
-15 -26 139,402 55 13 17,436 125 52 3,383 195 91 903
-10 -23 118,018 60 16 15,311 130 54 3,050 200 93 829
-5 -21 100,221 65 18 13,474 135 57 2,754 205 96 763
0 -18 85,362 70 21 11,883 140 60 2,490 210 99 703
5 -15 72,918 75 24 10,501 145 63 2,255 215 102 648
10 -12 62,465 80 27 9,299 150 66 2,045 220 104 598
15 -9 53,658 85 29 8,250 155 68 1,857 225 107 553
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xyleminc.com/brands/bellgossett
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem Inc. 210668B May 2012