State Industries ULTRA FORCE 101 User Manual

Page 9

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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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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

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