Service & Maintenance

Table 5-1

Control Settings and Time Delays

Control Description

Elec. Designation

Contacts Open

Contacts Closed

 

 

 

 

Compressor Circuit Breakers

 

 

 

S*HF 20 - 60

1CB8 thru 1CB11

See Table 5-2

See Table 5-2

S*HG 90 - 130

1CB14 thru 1CB17

See Table 5-2

See Table 5-2

Combustion Airflow Switch

 

 

 

(Gas Heat Only)

4S25

see note 1

0.1 - 0.25" wc rise in press diff

High Limit Cutout

 

 

 

(Gas Heat Only)

4S26

250 + 15 F

210 F

Supply Airflow Switch

 

 

 

(Gas Heat Only)

4S38

0.03 - 0.12" wc

0.15 + 0.05" wc rise in press diff

Disch High Limit

 

 

 

(Electric Heat Only)

4S27

133 + 5 F

110 + 5 F

Linear High Limit

 

 

 

(Electric Heat Only)

4S33

185 + 10 F (std./UL)

145 F (std./UL)

 

 

165 F + 10 F (CSA)

125 F (CSA)

Freezestat

 

 

 

(Hydronic Heat Only)

4S12

(N.O.) Auto Reset

40 F

Gas Heat Units

 

 

 

Prepurge Timer: Fenwall

4DL5

N.C. - timed to close

60 seconds

Honeywell

4U18

internal timing function

60 seconds

Sequencing Time Delay Relay

4DL6

N.C. - timed to close

60 seconds + 20%

Notes:

 

 

 

1. The combustion airflow switch (4S25) differential is 0.02" - 0.08" wc.

Table 5-2

Compressor Circuit Breakers (1CB8 - 1CB11 & 1CB14 - 1CB17) Electrical Characteristics

 

 

 

 

200V

230V

 

460V

 

 

575V

Unit

Compr.

Compr.

Must

Must

Must

Must

Must

Must

Must

Must

Size

Desig.

Size

Hold

Trip

Hold

Trip

Hold

Trip

Hold

Trip

20

A & B

9 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

25

B

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

A

9 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

30

A & B

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

40

1,2A & 1,2B

9 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

50

1B, 2B

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

1A, 2A

9 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

55

1,2A & 1,2B

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

60

1,2A & 1,2B

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

70

1,2C

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

1,2A & 1,2B

9 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

75 Std.

1,2C

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

1,2A & 1,2B

9 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

75

1,2C

15 ton

76

87.4

76

87.4

33

38

26.4

30.4

Hi-Cap

1,2A & 1,2B

10 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

90

1,2B & 1,2C

15 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

1,2A

10 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

105

1A,1B & 1C

15 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

2A,2B & 2C

 

 

 

 

 

 

 

 

 

115

1,2C & 1,2D

15 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

1,2A & 1,2B

10 ton

51

58.7

51

58.7

22.2

25.5

17.7

20.4

130

1,2C & 1,2D

14 ton

76

87.4

76

87.4

33

38

26.4

30.4

 

1,2A & 1,2B

 

 

 

 

 

 

 

 

 

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