Reznor YDSA Unit Installation Manual - Manual (Page 40)

Form I-Y, P/N 273646R6, Page 40
Instructions for
Measuring Manifold
Pressure - Option AG71
(2-stage with one heat
section)
Gas Pressure Tap Location
Locate the 1/8” pressure tap on the manifold. (See FIGURE 23, page 39). Close the
manual valve and connect a manometer to the 1/8” pressure tap in the manifold. Both
high-fire and low-fire pressure can be checked at the manifold pressure tap. 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.
Step 1 - High-Fire Manifold Pressure Reading
Using the manometer, measure the manifold pressure on high fire. 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
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 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 2 field OFF and ON to actuate the
valve. Recheck the manifold pressure and repeat Step 2 if required. If the pressure
reading is correct, set the value of Stg 2 to OFF and proceed to Step 3.
Step 3 - Low-Fire Manifold Pressure Reading
Using the manometer, measure the manifold pressure on low fire (Stg 1 ON). Check
the pressure with the chart on page 48. 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 - Low Fire Manifold Pressure Adjustment
Remove the cap from the low 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. Cycle the burner by turning the value of the Stg 1 field OFF and ON to actuate
the valve.
Recheck the manifold pressure and repeat Step 4 if required.
Step 5 - Close the manual valve. Remove the manometer. Check for a leak at the
pressure tap using a leak-detecting solution.
If further unit component testing is required proceed with the instructions in Paragraph
10.3 for the remaining test mode menu screens. If further unit testing is not required,
press the enter key in succession until the cursor is flashing in the uppermost left hand
corner of screen E.a.5 and use the up arrow key to navigate to Test Mode Screen
E.a.1. Press the enter key to select the Enable: field. Press the down arrow key to set
the value to OFF.
9.2.2 Checking Gas Pressure (cont’d)
9.2 Gas Heat Section (cont’d)
9.0 Optional Equipment including Heat Sections (cont’d)