Low Gas Pressure Switch; On/Off Switch; Hot Surface Igniter; Gas Piping - State Water Heaters Ultra Forcce SUF 60 120 Installation & Operation Manual

LOW GAS PRESSURE SWITCH

(SEE FIGURE 13)
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. (1.25 kPa) W.C.
is encountered. The contacts will open when the pressure falls below the
fixed set point of 5.0 in. (1.25 kPa) W.C. The LGS monitors the gas supply
pressure to the heater. If the gas supply falls below 5.0 in. (1.25 kPa) W.C.,
the main burner is extinguished (if heater is running) or the heater will not
start up.
NOTE: LOW GAS IS
LOCATED ON INLET
SIDE OF GAS VALVE.

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.
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.
(Based upon a Pressure Drop of 0.5 inch 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"
10 175 360 680
20 120 250 485
30 97 200 375
40 82 170 320
50 73 151 285
60 66 138 260
70 61 125 240
80 57 118 220
90 53 110 205
100 50 103 195
125 44 93 175
150 40 84 160
175 37 77 145
200 35 72 135
FIGURE 13
CAUTION
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR
1 1/4" 1 1/2" 2" 2 1/2" 3"
1400 2100 3960 6300 11000 23000
950 1460 2750 4360 7700
770 1180 2200 3520 6250
660 990 1900 3000 5300
580 900 1680 2650 4750
530 810 1520 2400 4300
490 750 1400 2250 3900
460 690 1300 2050 3700
430 650 1220 1950 3450
400 620 1150 1850 3250
360 550 1020 1650 2950
325 500 950 1500 2650
300 460 850 1370 2450
280 430 800 1280 2280
Size the main gas line in accordance with Table 3. The figures shown are
for straight lengths of pipe at 0.5 in. (125 kPa) 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.
DO NOT USE FLEXIBLE GAS PIPING.
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN 14.0"
WATER COLUMN (1/2 POUND or 3.45 kPa PER SQUARE INCH) SUPPLY
GAS PRESSURE. HIGHER GAS SUPPLY PRESSURES REQUIRE
SUPPLEMENTAL REDUCING SERVICE REGULATION. EXPOSURE TO HIGHER
GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE GAS CONTROLS
WHICH COULD RESULT IN FIRE OR EXPLOSION. IF OVERPRESSURE HAS
OCCURRED SUCH AS THROUGH IMPROPER TESTING OF GAS LINES OR
EMERGENCY MALFUNCTION OF THE SUPPLY SYSTEM THE GAS VALVE
MUST BE CHECKED FOR SAFE OPERATION. MAKE SURE THAT THE OUTSIDE
VENTS ON THE SUPPLY REGULATORS AND THE SAFETY VENT VALVES
ARE PROTECTED AGAINST BLOCKAGE. THESE ARE PARTS OF THE GAS
SUPPLY SYSTEM, NOT THE HEATER. VENT BLOCKAGE MAY OCCUR
DURING ICE STORMS.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM
CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE
IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE INTERNALLY TINNED
AND CERTIFIED FOR GAS SERVICE.
BEFORE ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS CLEAN
ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE, A
DIRT LEG (SOMETIMES CALLED A SEDIMENT TRAP OR DRIP LEG) MUST BE
INCORPORATED IN THE PIPING (SEE FIG. 14). THE DIRT LEG MUST BE
READILY ACCESSIBLE AND NOT SUBJECT TO FREEZING CONDITIONS.
INSTALL IN ACCORDANCE WITH RECOMMENDATIONS OF SERVING GAS
SUPPLIERS. REFER TO THE NATIONAL FUEL GAS CODE.
TABLE 3
LENGTH
IN
4" METERS 1/2"
3.0 51
15800 6.1 35
12800
9.1 28
10900 12.2 24
9700 15.2 21
8800
18.3 19
8100 21.3 18
7500 24.4 17
7200 27.4 16
6700 30.5 15
6000 38.1 13
5500
45.7 12
5000 53.3 11
4600 61.0 10
12
CAUTION
WARNING
FIGURE 14
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN KW
3/4" 1" 1 1/4" 1 1/2" 2"
105 199 410 615 1160
73 142 278 428 805
59 110 225 346 644
50 94 193 290 556
44 83 170 264 492
40 76 155 237 445
37 70 143 220 410
35 64 135 202 381
32 60 126 190 357
30 57 117 182 337
27 51 105 161 299
25 47 95 146 278
23 42 88 135 249
21 40 82 126 234
2 1/2" 3" 4"
1845 3221 6735
1277 2255 4626
1031 1830 3748
878 1552 3192
776 1391 2840
703 1259 2577
659 1142 2372
600 1083 2196
571 1010 2108
542 952 1962
483 864 1757
439 776 1610
401 717 1464
375 688 1347