BASO G93 Series Combination Automatic Gas Valve - Manual (Page 4)

4 G93 Series BASOTROL Combination Automatic Gas Valve Installation Instructions
Setup and Adjustments
Checkout
!
WARNING: Risk of Explosion or Fire.
Follow this or an equivalent checkout procedure
after installation. Before leaving the installation,
verify that the gas valve functions properly and that
the system has no gas leaks. Gas leaks can lead to
an explosion or fire, and may result in severe
personal injury or death.
Make sure all components are functioning properly by
performing the following test:
1. Test all joints and connection for leaks with a soap
solution.
2. Close the main upstream shutoff valve and the B
valve (applications with a B valve only). Wait at
least 5 minutes for unburned gas to escape from
the appliance and then reopen the valves.
3. Push the reset button and light the pilot burner.
Continue to hold the reset button for 30 to
45 seconds or until the pilot remains lit when the
reset button is released.
4. Set the thermostat to the highest setting. The main
burner should now ignite from the pilot burner.
5. Extinguish the burner by closing the main
upstream manual shutoff valve. Verify that the
valve drops out within 90 seconds.
6. Relight the pilot burner.
7. Check the millivoltage (mV) output of the
thermocouple and the milliampere (mA) dropout
range of the BASO power unit to ensure that they
meet the values listed in Table 1 and Table 2.
Step-by-step procedures for these checks are
included with the Y99AB-4 BASO Test Kit
Application Note (Part No. 24-8711-838).
8. Observe at least three complete operating cycles
to make sure that all components are functioning
properly.
9. Reset the thermostat to the desired setting before
leaving the installation.
Table 1: Thermocouple Output
Thermocouple mV Range
Lead
Type TurnDown Normal Not Less
Than
K15 4 mV 20-28 15
K16 4 mV 25-35 17
K19 4 mV 25-35 17
Table 2: Dropout Range
mA Range of Power Unit Assembly
Low High
100 300
Regulator Adjustment
!
WARNING: Risk of Explosion or Fire.
Do not adjust the minimum flow rate of the valve
below the minimum safe working rate of the
appliance. This may cause gas leaks, which can
lead to an explosion or fire, and may result in severe
personal injury or death.
IMPORTANT: Refer to and follow any specific
instructions issued by the appliance manufacturer
with regards to servicing their equipment.
The pressure regulator is adjustable and has been set
to a specific customer requirement. If a different
setting is desired, follow these instructions:
1. Shut off all gas to the appliance.
2. Turn the thermostat to the lowest setting or Off
position.
3. Remove the pressure tap plug at the valve outlet
or in the manifold pipe downstream of the valve.
4. Install a manometer or pressure gauge suitable for
measuring desired orifice pressure.
5. Remove the seal screw at the end of the regulator
stack (Figure 3).
6. Turn the gas on and place the thermostat at the
highest setting.
7. Adjust the screw in the regulator stack to the
desired reading on the manometer. (Turn
clockwise to increase the outlet pressure and
counterclockwise to reduce the outlet pressure.)
8. Reinstall the seal screw, which incorporates the
proper size hole for venting to the atmosphere. (It
may be necessary to cycle the valve several times
to verify the desired outlet pressure.)
9. Turn off the gas supply and place the thermostat
at the lowest setting.