CONTROLS AND SWITCHES

All models are provided with four pressure switches. These switches are essential to the safe and proper operation of the unit. All switches are wired in series. The controller is set up to shut the unit down whenever there is a failure of any of the switches. It is important to understand the purpose of each switch.

FIGURE 12.

BLOWER PROVER SWITCH

(SEE FIGURE 12)

The Blower Prover Switch is provided on the heater to verify that the fan is operating. It is a positive pressure switch whose electrical contacts are normally open. When the fan increases the pressure in the burner, the pressure switch will allow the electrical contacts to close. The pressure switch is connected to the burner tap by a piece of tygon tubing. This tubing must be connected in order for the switch to change the electrical contacts. The controller requires that the electrical contacts on this air flow switch be open before it will allow the blower to come on.

BLOCKED OUTLET PROVER SWITCH

(SEE FIGURE 12)

The Blocked Outlet Prover Switch is set up to shut the unit off when a build-up of positive pressure in the exhaust vent pipe occurs. This switch is a positive pressure switch that requires an increase in pressure to change the electrical contacts from normally closed to open. When this switch prevents the unit from igniting, most likely the exhaust is blocked by some means Check to see if the condensate is allowed to flow freely from the exhaust elbow and for obstructions in the exhaust venting and exhaust vent terminal. Also verify that there is no more than fifty equivalent feet (15.2 m) of three inch PVC vent pipe on the exhaust.

BLOCKED INLET PROVER SWITCH

(SEE FIGURE 12)

The Blocked Inlet Prover Switch is set up to shut the unit off when a build-up

of negative pressure in the intake vent pipe occurs. This switch is a negative pressure switch that requires an increase in negative pressure to change the electrical contacts from normally closed to open. The switch is connected to the pressure tap on the PVC flange connected to the inlet of the blower. When this switch prevents the unit from igniting, most likely the intake is blocked by some means. Check to see if there is no more than fifty equivalent feet (15.2 m) of three inch PVC vent pipe on the intake. Also verify that the intake and intake vent terminal is free of obstructions that may prevent air

from entering the unit.

LOW GAS PRESSURE SWITCH

(SEE FIGURE 12)

The Low Gas Switch (LGS) is a single-pole, normally open pressure switch that will close its contacts when a rising pressure of 5.0 in. (1.25Kpa) W.C. is encountered. The contacts will open when the pressure falls below the fixed set point of 4.8"WC (1.18Kpa) for natural gas models and 8.5"WC (2.08Kpa) for propane models. The LGS monitors the gas supply pressure to the heater. If the gas supply falls below 5.0 in. (1.25Kpa) W.C., the main burner is extinguished (if heater is running) or the heater will not start up.

ON/OFF SWITCH

The ON/OFF Switch is a single-pole, single-throw rocker switch. This switch provides 120V from the line source to the heater.

CAUTION

THE WATER HEATER IS POLARITY SENSITIVE. BEFORE APPLYING ELECTRICITY TO THIS HEATER BE CERTAIN THAT SUPPLY NEUTRAL WIRE TO GROUND CHECK INDICATES ZERO VOLTAGE.

HOT SURFACE IGNITER

The Hot Surface Igniter is a device that ignites the main burner by high temperature (>1800°F or >982°C). When 120VAC is applied to the igniter, sufficient heat is generated to ignite the main burner. Although improvements have been made to strengthen the igniter, it is still fragile and care must be taken when handling the igniter to prevent breakage.

GAS PIPING

Contact your local gas service company to ensure that adequate gas service is available and to review applicable installation codes for your area.

Size the main gas line in accordance with Table 3. The figures shown are for straight lengths of pipe at 0.5" (125Pa) W.C. pressure drop, which is considered normal for low pressure systems Note that fittings such as elbows and tees will add to the pipe pressure drop.

CAUTION

DO NOT USE FLEXIBLE GAS PIPING.

TABLE 3. MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR

(Based upon a Pressure Drop of 0.5") Water Column and 0.6 Specific Gravity Gas and max. gas pressure of 0.5 psig)

LENGTH

 

 

NORMAL IRON PIPE SIZES (INCHES)

 

IN

 

 

 

INPUT IN THOUSANDS BTU/HR

 

FEET

1/2"

3/4"

1"

1 1/4"

1 1/2"

2"

2 1/2"

3"

4"

10

175

360

680

1400

2100

3960

6300

11000

23000

20

120

250

485

950

1460

2750

4360

7700

15800

30

97

200

375

770

1180

2200

3520

6250

12800

40

82

170

320

660

990

1900

3000

5300

10900

50

73

151

285

580

900

1680

2650

4750

9700

60

66

138

260

530

810

1520

2400

4300

8800

70

61

125

240

490

750

1400

2250

3900

8100

80

57

118

220

460

690

1300

2050

3700

7500

90

53

110

205

430

650

1220

1950

3450

7200

100

50

103

195

400

620

1150

1850

3250

6700

125

44

93

175

360

550

1020

1650

2950

6000

150

40

84

160

325

500

950

1500

2650

5500

175

37

77

145

300

460

850

1370

2450

5000

200

35

72

135

280

430

800

1280

2280

4600

LENGTH

 

 

NORMAL IRON PIPE SIZES (INCHES)

 

IN

 

 

 

 

INPUT IN KW

 

 

 

METERS

1/2"

3/4"

1"

1 1/4"

1 1/2"

2"

2 1/2"

3"

4"

3.0

51

105

199

410

615

1160

1845

3221

6735

6.1

35

73

142

278

428

805

1277

2255

4626

9.1

28

59

110

225

346

644

1031

1830

3748

12.2

24

50

94

193

290

556

878

1552

3192

15.2

21

44

83

170

264

492

776

1391

2840

18.3

19

40

76

155

237

445

703

1259

2577

21.3

18

37

70

143

220

410

659

1142

2372

24.4

17

35

64

135

202

381

600

1083

2196

27.4

16

32

60

126

190

357

571

1010

2108

30.5

15

30

57

117

182

337

542

952

1962

38.1

13

27

51

105

161

299

483

864

1757

45.7

12

25

47

95

146

278

439

776

1610

53.3

11

23

42

88

135

249

401

717

1464

61.0

10

21

40

82

126

234

375

688

1347

13

Page 13
Image 13
State Industries 100, 101 warranty Controls and Switches, GAS Piping

100, 101 specifications

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