Low Water Cutoff Board And Probe; Thermostat/E.c.o. Probes; Transformer; Junction Box - State Water Heaters ROOFTOP SRT80 120NE Installation & Operation Instruction

LOW WATER CUTOFF BOARD AND PROBE

The Low Water Cutoff Board and Probe monitors the water level to
confirm the tank is completely full. This function is very important
when the unit is first filled with water and when complete loss of
power is encountered during freezing temperatures (in case the
unit drains while using the anti-freeze kit), see Figure 20.

THERMOSTAT/E.C.O. PROBES

The Outback utilizes a two probe system. The upper probe located
on top of the unit toward the back of the cabinet consists of a
thermostat and E.C.O. The thermostat monitors the top temperature
in the tank. The E.C.O. high limit switch interrupts the main burner
gas flow should the water temperature reach approximately 205°F.
The lower probe measures the water temperature in the lower half
of the tank assembly.

TRANSFORMER

The control system utilizes a 120/24 VAC step down transformer.
Most of the control system utilizes 24 VAC for operation. See wiring
diagram for those components utilizing 24 VAC and 120 VAC, see
Figure 22.

JUNCTION BOX

The junction box is where the 120 VAC is supplied to the unit and
tied into the rest of the controls. The junction box provides a
FIGURE 20
FIGURE 21
FIGURE 22
grounding screw to tie into the metal panel to assure the unit is
grounded, see Figure 23.

TANK ASSEMBLY SYSTEM

The Tank Assembly is an 80 gallon unit with a U-shaped heat
exchanger. It incorporates two inlet tubes to control flow inside the
tank. The heat exchanger is equipped with a stainless steel baffle
which is non-removable. The working pressure is 150 psi, see
Figure 24.

TANK INSULATION

The tank assembly is wrapped in foam insulation sealed inside a
round jacket. The ends of the tank consist of high temperature
fiberglass insulation and foam dams to prevent foam leakage,
see Figure 25.
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FIGURE 23
FIGURE 24
FIGURE 25