Installation guide

035-20530-001Rev.B(0804)
Part 4: Checkout Data
A. Furnace Checkout
1. Verify Cardboard Pad "Shoehorn" was removed.
Remove Cardboard Pad "Shoehorn" before operat-
ing furnace.
Fire Hazard.
Failure to remove may cause property damage, per-
sonal injury or loss of fife.
2. Check Air Temperature Rise (ATR).
a. Make sure furnace has operated for at least 5
minutes.
b. Measure return air temperature at top louver
openings of top furnace door.
c. Measure supply air temperature at the closet reg-
ister/grille.
d. Subtract the return air temperature from the sup-
ply air temperature to obtain the ATR.
3. If measured ATR is outside parameters shown on the
furnace rating plate, then you will need to determine
why unit is operating beyond its design parameters. If
the ATR is too low, it is an indication of an underfired
furnace. Make sure that your gas pressure is set
properly. If the ATR is too high, it is an indication of
an overtired furnace. Once again, you will need to
make sure that your gas pressure is set properly. If
found to be okay, you should then also clock the
meter to determine the units firing rate, and if
needed, check the supply duct system static pres-
sure. Refer to Part 5 for information on how to mea-
sure gas pressure, determine the firing rate and
measure supply static pressure.
If any items tested result in findings outside the design
parameters listed on the units rating plate, it is an indication
of application/installation problems that must be addressed.
Since application/installation problems are not covered under
the warranty, you will need to discuss this situation with the
homeowner as they will be responsible for covering any
charges to correct any problems found.
4. If measured ATR is within design parameters, pro-
ceed to step B and complete your on-site visit.
B. Complete On-Site Visit
1. Verify all gas-fueled appliances are returned to nor-
mal operation. Follow instructions provided by the
appliance manufacturer.
2. Complete the DGAT Program Claim Form.
a. Record your name and company information.
b. Obtain homeowner's signature.
c. Sign claim form to certify the furnace has been
properly upgraded.
3. Review the Consumer Notice with the customer.
12 Unitary Products Group