CONTROL BOARD SEQUENCE of

OPERATION

The desuperheating control board will make a determination whether or not to energize the pump relay inclusive on the control board.

A.It will constantly monitor inputs from two temperature sensors, Inlet & Outlet water sensors.

B.It will constantly monitor the Y signal.

C.Upon acknowledgment of Y signal, and following two minutes, the control board will energize the pump relay.

D.After 1½ minutes, based on temperature difference between Outlet & Inlet sensors, and the presence of Y signal, the following will take place:

1.) If temperature difference is greater than 3°F, then the control will continue to energize pump relay.

2.) If temperature difference is less than 3°F, then the control will de-energize the pump relay.

3.) The control will next wait for 10 minutes before repeating Step #1 (above).

E.The Over Temperature Limit Switch is placed in series with the line voltage. Therefore, continuity between L of line voltage and L of pump output is forced broken when the Over Temperature Limit Switch opens (see Wiring Diagram).

F.The 3-amp fuse is put in series with the R connection to the board. Whenever the fuse is blown, the control will lose power and consequently, the relay will disengage.

Figure 5

THERMISTOR

TEMPERATURE F vs RESISTANCE R OF TEMPERATURE SENSOR

F

R

F

R

 

 

 

 

53.0

19374

89.0

7507

52.0

18867

90.0

7334

53.0

18375

91.0

7165

54.0

17989

92.0

7000

55.0

17434

93.0

6840

56.0

16984

94.0

6683

57.0

16547

95.0

6531

58.0

16122

96.0

6383

59.0

15710

97.0

6239

60.0

15310

98.0

6098

61.0

14921

99.0

5961

62.0

14544

100.0

5827

63.0

14177

101.0

5697

64.0

13820

102.0

5570

65.0

13474

103.0

5446

66.0

13137

104.0

5326

67.0

12810

105.0

5208

68.0

12492

106.0

5094

69.0

12183

107.0

4982

70.0

11883

108.0

4873

71.0

11591

109.0

4767

72.0

11307

110.0

4663

73.0

11031

111.0

4562

74.0

10762

112.0

4464

75.0

10501

113.0

4367

76.0

10247

114.0

4274

77.0

10000

115.0

4182

78.0

9760

116.0

4093

79.0

9526

117.0

4006

80.0

9299

118.0

3921

81.0

9077

119.0

3838

82.0

8862

120.0

3757

83.0

8653

121.0

3678

84.0

8449

122.0

3601

85.0

8250

123.0

3526

86.0

8057

124.0

3452

87.07869

88.07686

Manual

2100-517

Page

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Image 10
Bard GVDM-26 installation instructions Operation, Thermistor

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