INSTALLATION
ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heater. Failure to do so could result in personal injury or property damage. Heater must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70.
1.Before installing the PTH heater, inspect it thoroughly for possible damage which may have occured during shipment. Also check to insure that the line voltage is the same as that stamped on the heater nameplate.
2.Where work will pass over or near equipment, additional pro- tection such as a metal guard may be needed.
3.To resist buoyancy and to keep the heater in close profile with tank wall, a metal bracket with two mounting holes has been pro- vided.
4.IMPORTANT: Heated section (See Figure 1, “B” Dimension) must be totally immersed at all times. If the heater is not properly submerged, it will overheat and damage the heating elements and create a possible fire hazard due to excessive sheath temperatures.
5.Heater must not be operated in sludge.
FIRE HAZARD. Since heaters are capable of develop- ing high temperatures, extreme care should be taken to:
A.Avoid installing heaters in an atmosphere containing com- bustible gases and vapors.
B.Avoid contact between heater and combustible materials.
C.Keep combustible materials far enough away to be free of the effects of high temperatures.
WIRING
ELECTRIC SHOCK HAZARD. Any installation involving electric heaters must be performed by a qualified per- son and must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard.
1.Electrical wiring to heater must be installed in accordance with the National Electrical Code or local codes by a qualified per- son.
2.When element wattages are not equal, heaters must not be connected in series.
3.For single phase, apply power across two (2) black leads. Green wire (ground) must be properly grounded.
4.For balanced 3 phase loads, three (3) heaters of the same volt- age and wattage ratings are required. A
#1 |
| A | #1 | A | #1 | B |
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| A |
| A |
| B |
#2 | #3 | #2 | #3 |
| #2 | #3 |
Step 1: Designate one black leadwire as “A” and one black leadwire as “B”.
Step 2: Assign designations | Step 3: Connect leadwire “A” | Step 4: Connect leadwire “B” |
1, 2, 3 to heaters. | of Heater #1 to leadwire “A” | of Heater #1 to leadwire “B” |
| of Heater #2. | of Heater #3. |
A | #1 | B | A | #1 |
| B |
A |
| B | A |
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| B |
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| #2 | #3 | Three Phase |
#2 | #3 |
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| Power |
B | A | B |
| A |
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Step 5: Connect leadwire “B” |
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of Heater #2 to leadwire “A” | Step 6: Connect one 3 phase | |||
of Heater #3. |
| power line to each of the | ||
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| three connections. | ||
Note: Green wire (ground) of each heater must be properly grounded.
