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COMPONENTS- TOP VIEW (ALL MODELS)
IMPORTANT. The Enable/Disable switch listed in this manual is
NOT an "on/off" switch and does not disconnect 120-volt power
to the CCB and other heater components.
5
2
17
4
3
13
15
1
Figure 3. Top View
1. Water Heater's Enable/Disable Switch. When in the "Disabled"
position the switch removes electrical power from the gas valve
so that water heating is disabled. The display, CCB, and other
electrical components will still be energized and the display will
read "Water Heating Disabled".
2. Powered anode rods. The water heaters covered in this manual
are equipped with powered (non sacrificial) anode rods. The
SUF 60120 has one powered anode, all other models will
have two. Protective current is fed by the control system to the
titanium electrodes at the end of each anode rod. This current
flows through the water to the conductive surfaces inside the
storage tank which diminishes the corrosive effect of water when
it comes in contact with steel.
3. Central Control Board (CCB) enclosure. This enclosure houses
the control system's main circuit board, power supply board,
power transformer, and configuration key. The CCB regulates
water temperature and controls all water heater functions, see
Control System Operation on page 45.
4. Combustion Blower Assembly includes, Gas Valve and Venturi
gas feed system.
5. 120-VAC junction box. Incoming power supply, ground
connections, and other field installed electrical connections are
made here. See
Power Supply
(page 41).
Connections
6. Water heater's 24-volt gas valve.
7. Blocked Intake Air switch. Normally closed contacts that open on
fall in pressure. This switch is used to insure intake (combustion)
air to the water heater is not restricted. The control system
monitors this switch and will disable heating operation if its
contacts are open during a heating cycle.
FEATURES AND COMPONENTS
6
8
9
11
14
16
FRONT
(page 13) and
Power Supply
8. Supply gas line connection. See the requirements for gas supply
systems in
Gas Supply Systems
9. Low Gas Pressure switch. Normally open contacts that close
on a rise in pressure. This switch is used to insure supply gas
pressure is above minimum requirements. The control system
monitors this switch and will disable heating operation if its
contacts are open during a heating cycle. See the gas pressure
requirements listed in
10. Vent connection (exhaust / condensate elbow) - three-inch
aluminum.
11. Intake air connection - three-inch PVC.
12. Blocked Exhaust (vent) switch. Normally closed contacts that
2
open on a rise in pressure. This switch is used to insure the
Exhaust (vent) piping connected to the water heater is not
restricted. The control system monitors this switch and will
disable heating operation if its contacts are open during a
heating cycle.
7
13. Temperature-Pressure Relief Valve. See
(page 15).
Relief Valve
12
14. Upper Temperature Probe, 1 of 2 temperature probes. The
water heater's control system monitors this probe to detect
water temperature in the upper portion of the storage tank. The
Upper Temperature Probe also houses the Energy Cut-Out
10
switch (ECO). This is a non adjustable high temperature limit
switch. The ECO switch contacts are normally closed and will
open on a temperature rise. See
(page 44).
(ECO)
15. Water outlet connection 1 1/2" NPT.
16. UIM (user interface module). The UIM includes the display circuit
board and the control system's LCD Touch Display. Used to
adjust various user settings and view operational information.
See
Control System Operation
17. Spark Ignition Transformer. When energized, sends the
electrical current to the spark igniter.
8
(page 13).
(page 11).
Table 4
Temperature-Pressure
High Temperature Limit Control
(page 45).
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