Sit 695 NGA Technical manual

USE AND INSTALLATION
INSTRUCTIONS
0695000_IBK rev.00 1
695 NGA
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR
OPERATINGTHIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE
DESCRIPTION
The 695 NGA water heater control is a combination gas valve
and thermostat for use on atmospheric water heaters.
The microcontroller equipped electronics monitor the water
heater and indicates the status via a green status LED on the
front of control.
Fixed Adjustment Regulator Controls: the gas regulator on this
control requires no field service. The regulator automatically
controls and maintains the burner gas pressure.
PRECAUTION
WARNING
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance
•Do not touch any electrical switch; do not use any phone in
your building
•Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's Instructions
•If you cannot reach your gas supplier, call the fi department
WARNING
Pay attention to use the gas controller with the correct gas:
•The 695 NGA with BLACK thermostat knob (see Figure 2) is
allowed to be used with Natural Gas only
•The 695 NGA with RED thermostat knob (see Figure 2) is
allowed to be used with LP Gas only
Improper operation could occur, resulting in personal injury
and/or death due to Carbon Monoxide (CO) poisoning, fire, or
explosion. Check for proper gas type as listed on the rating plate
affixed to the water heater.
WARNING
FIRE AND EXPLOSION HAZARDS
•Shut off main gas to appliance for service or until installation
is complete
•Replace existing control with recommended model
•Protect the control from direct contact with water (dripping,
spraying, rain, etc.)
•If the control has been in direct contact with water, replace
the control
•Label all wires before disconnection when servicing controls;
wiring errors can cause improper and dangerous operation
•Route and secure wiring away from flame
•Do not use tools to operate this control
•Do not take control apart, there are no serviceable parts
inside
•Do not use control if it has been flooded
•Never stand on the control or use as a step
EN

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0695000_IBK rev. 00
SPECIFICATIONS
NATURAL GAS LPG
Range of Regulation (Btu/Hr)4" outlet: Min 25,000 Max 75,000 10" outlet: Min 30,000 Max 100,000
1.0" Pressure Drop Capacity 55,000 Btu/Hr (4" outlet) a70,000 Btu/Hr (10" outlet) b
Maximum Inlet Pressure 1/2 PSI
Ambient Temperature Rating 20°F to 170°F (-7°C to 76°C)
Automatic High Temperature Cutoff Resettable Type, 195°F (90°C)
Body Configuration Right angle with a 1 /2" NPT inlet and a 1 /2" inverted flare outlet
Control Input Voltage Minimum: 435 mV dc, open circuit Voltage Maximum: 1200 mV dc, open circuit
Mounting Upright
aBased on 1000 Btu/ft3, 0.64 specify gravity natural gas
bBased on 2500 Btu/ft3, 1.53 specify gravity LP gas
INSTALLATION
NOTE
1. This control must be installed or serviced only by a qualified
service person.
2. For your safety, this control is supplied with tamper
resistant screws. Do not attempt to repair or adjust the
control. If you experience problems, replace the control
immediately. Continuing to use a damaged control could
result in fire and/or explosion.
3. An odorant has been added to the gas to help you detect it.
Before lighting, search for the odor of gas by sniffing at
floor level around the water heater.
4. In some situations, the gas may lose its odor.To detect
unodorized gas, you must have a gas detector, which can be
purchased from your gas company. If you do not have a
detector and have the slightest suspicion that gas may be
present, get out of the house and call the gas company.
DO NOT RELY TOTALLY ON YOUR NOSE.
REMOVING THE OLD CONTROL
1. Locate the gas control. Before performing any maintenance,
turn the gas control thermostat knob to the OFF setting.
(Figure 3)
2. Close gas shut off valve.
3. Remove the two electrical connections that are plugged
into the control (Figure 2).
4. Shut off the water at the cold water inlet.
5. Connect a hose to the water heater drain cock. Drain the
water to a nearby drain. Open a hot water faucet for faster
draining.
6. Disconnect the gas line at the union (Figure 1). Remove the
piping from the old control.
7. Disconnect main burner tube fitting and pilot tube fittings
(Figure 2).
8. Remove the control by turning counter clockwise ( )if
needed, a short piece of 1/2" black iron pipe can be
screwed into the control inlet to increase leverage.
INSTALLING THE NEW CONTROL
All piping must comply with local and state ordinances or with the
National Fuel Gas Code (ANSI Z223.1-NFPA 54), whichever applies.
1. Apply pipe compound to the male threads that screw into
the tank, leaving the first two or three threads clean.
2. Install control in the tank. Turn clockwise ( ). Use a short
piece of pipe to help in turning. Align the control so that the
burner tube may be connected.
3. Reconnect the main burner and pilot tube connection. Do
not use pipe joint compound or Teflon tape.
4. Connect the gas line. Use new black iron pipe that has been
properly reamed. If old pipe is used, be sure it is clean and
free from rust and scale. Use pipe joint compound on male
threads only. (Use pipe joint compound approved for natural
and LP gas service.) Do not use Teflon tape.Do not apply
compound to the first two threads.
5. Reconnect gas line at the union. DO NOT use joint
compound or tape on the union connection.
6. Reconnect the electrical connections to the control. There
are three connections for the control. Connect the positive
lead from control to the thermal switch on the tank.
Connect negative lead (white) from pilot generator to the
negative terminal on control. Connect piezo spark connector
to igniter wire connector (Figure 2).
NOTE
The cold water supply valve MUST be left open when the
water heater is in use
WARNING
Dirt or contamination in the gas line can block the control from
operating creating a risk of explosion, injury, or death. To protect
the control from dirt and contamination, a drip leg or sediment
trap (see Figure 1) must be installed in the piping leading to the
control.

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0695000_IBK rev.00
INSTALLATION
Figure 1. Typical gas connection
7. To fill the water heater with water:
a. Close the water heater drain valve. The drain valve is
on the lower front of the water heater.
b. Open the cold water supply valve to the water heater.
c. Close the water heater drain valve. The drain valve is
on the lower front of the water heater.
d. Open the cold water supply valve to the water heater.
8. Open the gas shutoff valve
9. BEFORE TURNING ON THE APPLIANCE, CHECK THE GAS
LINES FOR LEAKS.
a. Use a soapy water solution. DO NOT test for gas
leaks using a match or open flame.
b. Brush the soapy water solution on all gas pipes,
joints and fittings. Use care that excess solution
does not enter the control's plastic housing.
c. Check for bubbling soap. This means you have a
leak. Close gas shutoff valve and make the
necessary repairs.
d. Open gas shutoff valve and recheck for leaks. Repeat
this process until you are sure the system is gas-
tight. If repeated work on a part does not stop the
leak, the part must be replaced.
e. Rinse off the soapy solution and wipe all the
plumbing parts dry.
Figure 2. Gas control features
TO LIGHT APPLIANCE
1. STOP! Before lighting, read the water heater's safety
information label.
2. Turn temperature setting knob to OFF position (Figure 3).
3. Wait at least five minutes to clear out any gas, and then
smell around the appliance area near the floor. If you smell
gas, STOP! Follow the instructions " What to do if you smell
gas "on the first page of the instruction sheet. If you do not
detect gas, continue with the next step.
4. To expose inner door sight glass, remove outer door and
insulation (if applicable). Do not attempt to remove inner
door assembly.
5. Rotate the combination gas control thermostat knob clock-
wise ( )to the "PILOT" position (Figure 3).
6. Depress and hold the gas control thermostat knob all the
way in while immediately depressing the "PILOT IGNITER"
button. Repeat pressing the "PILOT IGNITER" button until a
pilot flame can be seen through the inner door sight glass.
7. Once the "STATUS" indicator light begins to blink once,
release the combination gas control thermostat knob.
•If the gas control thermostat knob does not spring
back, stop immediately and call a qualified service
person or your gas supplier.
•If the "STATUS" indicator light does not start blinking
once after 90 seconds or the pilot is not lit, repeat
steps 2 through 6.
•If "STATUS" indicator light does not start blinking
once after 3 attempts, call a qualified service person.
8. Verify the pilot remains lit by viewing the pilot flame
through the sight glass window located on the inner door.
9. Replace the inner door insulation (if applicable) and the
outer door.
10. Set the gas control thermostat knob to the desired setting
(Figure 3).
If the gas control thermostat knob does not allow rotation
from the pilot position to a temperature setting, do not use
tools or excessive force, call a qualified service person or
your gas supplier.
PILOT TUBE
FITTING
PILOT
GENERETOR
CONNECTION
MAIN BURNER
TUBE FITTING
PIEZO
CONNECTION
PIEZO
IGNITER
BUTTON
THERMOSTAT KNOB
GAS CONTROL
GAS SUPPLY PIPE
SHUT OFF VALVE
GROUND JOINT
UNION
TEE
DRIP LEG (SEDIMENT TRAP)
3" MINIMUM (MANDATORY)

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0695000_IBK rev. 00
WARNING
Scald burns occur in under one second with 155°F water, which
this thermostat will deliver if the temperature is set at "VERY
HOT". Lower settings of the temperature will reduce the risk of
scald and will reduce your fuel bill.
OPERATION
After the gas and electric connections are made and the water
heater tank is full of water, the control must be set to the desired
water temperature. The recommended thermostat knob setting is
the "HOT" setting. This is approximately the 125°F setting and the
safest and most economical setting for the water heater. If you
want hotter water rotate the thermostat knob clockwise ( )to a
higher setting. If you want cooler water, rotate the thermostat knob
counter clockwise ( )to a lower setting (Figure 3)
Figure 3. Thermostat knob settings
WARNING
The hotter the water the greater the risk of scald injury and the
shorter the time to cause injury.
WARNING
Never allow small children to use a hot water tap, or to draw
their own bath water. Never leave a child or impaired person
unattended in a bathtub or shower. Scald burns can result.
If you use hot water frequently and in short spurts, water
temperature can occasionally exceed the temperature setting by
up to 30°F because of the dynamics of the appliance.
Keep this in mind when you are selecting a temperature higher
than the factory default setting.
Be sure to protect babies, small children, and the infirm or other
with impaired mobility who cannot get out of the hot water
quickly. They are people most commonly hurt in scald injuries and
in need of lower temperature and other protection like
supervision, point of use temperature control equipment or a
system mixing valve. A point of use valve or system mixing valve
can be obtained from your local plumber.
To avoid scald injury, set the control to the lowest setting which
will deliver your needed hot water. Refer to Table 1 to determine
the approximate temperature setting, and the approximate time
for scald injury at that temperature
SHUTTING OFF GAS TO THE APPLIANCE
Rotate the temperature setting knob counter-clockwise to the "OFF" position. Note: The "STATUS" indicator light will briefly turn green then
go off after a short period of time (Figure 3).
TROUBLESHOOTING
The status indicator monitors the control system and indicates fault conditions via the status light. Fault conditions are indicated by a flash
sequence that identifies the probable cause of the fault. Note the status flash code and call your service technician or gas service supplier.
STATUS CODE DIAGNOSTIC
No LED Gas Control OFF - Pilot not Lit
1 Flash Every 4 Seconds Normal operation, Burner OFF
1 Flash Every 1 Second Normal operation, Burner ON
Solid LED Gas Control Recently Turned OFF - Thermopile Voltage Decreasing
2 Flashes Pilot Lit - Insufficient Voltage to Power & Run Gas Control
4 Flashes Water Temperature too High - Control Reset
5 Flashes Gas Control Problem - Replace Control
SETTING
APPROXIMATE
TEMPERATURE
APPROXIMATE
TIME
TO CAUSE INJURY
HOT 125°F 5 minutes
A133°F 30 seconds
B140°F 5 seconds
C148°F 1.5 seconds
VERY HOT 155°F Under 1 second
OFF setting PILOT setting
LOW setting
Table 1. Approximate temperature settings
VERY HOT setting HOT setting