Reznor YDSA Unit Installation Manual User Manual
Page 47
Form I-Y, P/N 273646R6, Page 47
Step 4 Modulating Valve Adjustment Instructions (See FIGURE 24B, page 43) - HIGH FIRE SETTING (BUTTON
#1)
1. To enter the high fire setting mode, press and hold button #1 until the LED lights solid red. Release. The valve is
now in the high fire setting mode. Buttons #1 and #2 are used to set desired high fire setting.
2. Press or hold Button #1 to increase gas flow. Each button press equates to the minimum available step size and
will increase flow slowly. Holding the button down auto steps and eliminates the need to repeatedly press the
button. Use the feature to rapidly increase the flow.
Press or hold Button #2 to decrease gas flow. Each button press equates to the minimum available step size and
will decrease flow slowly. Holding the button down auto steps and eliminates the need to repeatedly press the
button. Use this feature to rapidly decrease the flow.
3. To save the high fire setting, simultaneously hold Buttons #1 and #2 until the LED turns off.
NOTE: Controls left
in any setting mode will default to the current settings and return to normal operating mode after 5 minutes of
inactivity.
4. When the high-fire pressure measurement is correct, proceed to Step 5 to check low fire pressure. If high fire
cannot be accomplished, consult the factory service department.
Step 5 - Modulating Valve Adjustment Instructions (See FIGURE 24B, page 43) - LOW FIRE SETTING (BUTTON
#2)
1. To enter the low fire setting mode, press and hold button #2 until the LED light blinks red. Release. The valve is
now in the low fire setting mode. Buttons #1 and #2 are used to set desired low fire setting.
2. Press or hold Button #2 to decrease gas flow. Each button press equates to the minimum available step size and
will decrease flow slowly. Holding the button down auto steps and eliminates the need to repeatedly press the
button. Use this feature to rapidly decrease the flow.
Press or hold Button #1 to increase gas flow. Each button press equates to the minimum available step size and
will increase flow slowly. Holding the button down auto steps and eliminates the need to repeatedly press the
button. Use the feature to rapidly increase the flow.
3. To save the low fire setting, simultaneously hold Buttons #1 and #2 until the LED turns off.
NOTE: Controls left
in any setting mode will default to the current settings and return to normal operating mode after 5 minutes of
inactivity.
4. When the low-fire pressure measurement is correct, proceed to Step 6. If low fire setting cannot be
accomplished, consult the factory service department.
Step 5 - Low-Fire Manifold Pressure Reading Heat Section 1
From the Test Mode
Screen E.a.5:
•
Press the enter key until the cursor is flashing on the
Heat Capacity: field.
Adjust the Heat Capacity value to 0% which will result in a signal of 2vdc to the
modulating gas valve.
Using the manometer, measure the manifold pressure on low fire.
Check the pressure
with the chart below. Normally adjustments to the factory settings should not be
necessary.
Follow the procedure in Step 5 to adjust the low fire output pressure of the modulating
valve..
Step 6 - High-Fire Manifold Pressure Reading Heat Section 2
Set the value of Stg 1, 2, and 3 to OFF. Close the manual valve. Remove the manometer
from Heat Section 1 and connect it to the 1/8” pressure tap on the manifold in Heat
Section 2. Open the manual valve. Set the value for the Heat Capacity: to 100% and
set the value of Stg 1, 2, and 3 to ON.
Using the manometer, measure the pressure on high fire for Heat Section 2.
Check
the pressure with the chart on page 49. Normally adjustments to the factory
settings should not be necessary.
If no adjustment is required, proceed to Step 5.
If an adjustment is required, proceed to Step 4.
Step 4 - Modulating Valve High-Fire Pressure Adjustment Heat Section 1
Follow the procedure in Step 4 to adjust the high fire output pressure of the modulating valve.
Instructions for
Measuring Manifold
Pressure - Option
AG74 (modulation
with two heat
sections) (cont’d)