Reznor YDSA Unit Installation Manual - Manual (Page 41)

Form I-Y, P/N 273646R6, Page 41
Manifold Pressure Tap Locations
Locate the 1/8” pressure taps on both manifolds. (See FIGURE 23, page 39). Both
high-fire and low-fire pressure can be checked at the manifold pressure taps.
With the manual valve turned OFF, connect a manometer to the 1/8” pressure tap on
the manifold in Heat Section 1. Open the manual valve.
Unit Test Mode Must be Enabled - Refer to Paragraph 10.3 to enable Test Mode
Follow the instructions to enter Test Mode and proceed to Test Mode Screen E.a.5.
Manifold Pressure Measurements
From the Test Mode Screen E.a.5:
•
Press the enter key until the cursor is flashing on the
Stg 1: field. Press the up arrow to set the Stg 1 value to ON.
•
Press the enter key until the cursor is flashing on the
Stg 2: field. Press the up arrow to set the Stg 2 value to ON.
•
Press the enter key until the cursor is flashing on the
Stg 3: field. Press the up arrow to set the Stg 3 value to ON.
•
Press the enter key until the cursor is flashing on the
Stg 4: field. Press the up arrow to set the Stg 4 value to ON.
Step 1 - High Fire Manifold Pressure Reading Heat Section 1
Using the manometer, measure the pressure on high fire for heat section 1. 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 3.
If an adjustment is required, proceed to Step 2.
Step 2 - High Fire Manifold Pressure Adjustment Heat Section 1
Remove the cap from the high fire adjustment screw on the two-stage valve. Adjust
the pressure setting by turning the regulator screw IN (clockwise) to increase pressure.
Turn the regulator screw OUT (counterclockwise) to decrease pressure. Replace the
cap.
CAUTION: DO NOT bottom out the gas valve regulator adjusting
screw. This can result in unregulated manifold pressure causing
excess over fire and heat exchanger failure.
Cycle the burner by turning the value of the Stg 3 field OFF and ON to actuate the
valve. Recheck the manifold pressure and repeat Step 2 if required. If the pressure
reading is correct proceed to Step 3.
Step 3 - Low Fire Manifold Pressure Reading Heat Section 1
Set the value of Stg 3 to OFF. Heating Stg 1, Stg 2, and Stg 4 will need to remain
commanded ON for the low fire pressure measurement on Heat Section 1.
Using the manometer, measure the pressure on low fire for heat section 1.
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.
Instructions for Measuring Manifold Pressure - Option AG72 (4-stage
with two heat sections)
NOTE: Two digital manometers may be required.
Staging Sequence -
Gas Control Option AG72
Heat
Section
2 1
Stage 1 Off Low fire
Stage 2 Low fire Low fire
Stage 3 Low fire High fire
Stage 4 High fire High fire