State Industries ULTRA FORCE 101 - Manual (Page 9)

9
Gas Pressure requirements and Table 3 on page 12.
10. Vent connection (exhaust elbow) - 3 inch PVC.
11. intake air connection - 3 inch PVC.
12. blocked Exhaust (vent) switch. Normally closed contacts that
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.
13. blower Prover switch. Normally open contacts that close on a
rise in pressure. This switch is used to insure the Combustion
blower is operating properly. The control system monitors
this switch and will disable heating operation if its contacts
are closed before the Combustion blower is energized or
open any time during a heating cycle. See Sequence Of
Operation on page 58.
14. Temperature-Pressure relief Valve. See Temperature-
Pressure relief Valve on page 16.
15. 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 ECO (energy
cut out) switch. This is a non adjustable high temperature
limit switch. The ECO switch contacts are normally closed
and will open on a temperature rise. See High Temperature
Limit Control (ECO) on page 43.
16. Water outlet connection 1 1/2” NPT.
17. Uim (user interface module). The Uim includes the display
circuit board, the control system’s LCD display and
operational buttons. Used to adjust various user settings and
view operational information. See Control System Operation
on page 44.
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2
4
5
6
8 10
12
11
2
13
14
16 1
17
15
9
7
FRONT
199,000 & 250,000
Btu/hr MODELS
TOP VIEW
suf 199 & 250 components
1. Water Heater’s 120 VAC on/off switch.
2. Powered anode rods. The water heater’s covered in this
manual are equipped powered (non sacrificial) anode
rods. The SUF 120 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 (rusting) 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. The CCb
regulates water temperature and controls all water heater
functions, see Control System Operation on page 44.
4. Ebm Combustion blower Assembly includes VFD (variable
frequency drive), Gas Valve and Venturi gas feed system.
5. 120 VAC junction box. incoming power supply and ground
connections are made here. See Power Supply on page 14.
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.
8. Supply gas line connection. See the requirements for the
Gas Supply Systems on page 14.
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
top Views (cont)
figure 4