Reznor OH, Инструкция по установке, эксплуатации и обслуживанию

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26 I-OH (01-20) PN120390R7
OPERATION—CONTINUED
Startup Checklist—Continued
c. Adjust draft regulator as necessary until reading on gauge −0.01 IN WC.
d. Replace metal plug in observation door.
e. To measure flue draft, insert air pressure gauge in 5/16-inch hole that was drilled in flue pipe halfway between
furnace and draft regulator. Flue draft measurement must be −0.03 to −0.04 IN WC.
⚠ CAUTION ⚠
• If draft is insufficient, it will create back pressure that results in oil fumes in the building, pulsating
when the burner starts and stops, and/or excessive soot deposits. If there is too much draft, it
could cause ignition problems, erratic burner, and loss of thermal efficiency.
• Back pressure (backdraft or downdraft) may be caused by the chimney being lower than surrounding
objects, such as buildings, hills, trees, rooftops, etc. It may be caused by an exhaust fan in the
building. The air intake in the room where the heater is installed must be of sufficient size so that
there is no change in the draft reading in the flue with the exhaust fan running.
• If there is a backdraft or downdraft, do not continue operation of the heater until the situation is
corrected. Equipment and/or property damage could result.
f. Correct insufficient draft by increasing chimney height and/or installing UL-listed draft inducer. If draft inducer
is used, provision must be made to shut OFF fuel supply to burner in event of draft inducer failure.
g. Correct too much draft by adjusting barometric damper regulator to reduce draft.
‰
Check combustion air shutter and air band settings:
the heater is shipped from the factory with the settings
listed in Table 12 . Ordinarily, these settings will result in a CO
2
level shown in the tabled ranges. However, certain
field conditions may require a change. To determine if the air setting needs to be adjusted, a smoke tester and
CO
2
analyzer are required. Adjust combustion air as follows:
a. Service and clean burner, combustion chamber, and heat exchanger as necessary.
b. Operate unit for at least 10 minutes.
NOTE: The longer and more restrictive the flue, the higher the draft necessary to obtain accepted
overfire conditions.
c. Adjust overfire draft to −0.01 to −0.02 IN WC. Draft readings in breaching will be higher depending on flue
passages of heater.
d. Take smoke reading in accordance with smoke tester manufacturer’s instructions. Adjust combustion air to
obtain preliminary reading of about No. 3 smoke spot. Then, readjust air until reading between No. 0 and No.
1 (trace smoke) is achieved. Do not open air adjustment more than absolutely necessary to obtain trace or
No. 0 smoke spot.
e. Take CO
2
sample in accordance with CO
2
gas analyzer manufacturer’s instructions. Open air shutter (see
Figure 18 ) until CO
2
level lowers by 1%. CO
2
reading should fall within range listed in Table 12 .
f. Burner is now set for optimum but stable efficiency.
Adjustments
Burner Pump Pressure Adjustment
⚠ CAUTION ⚠
Pressurized or gravity feed installations must not exceed 3 psi on inlet line or return line at the
pump. A pressure greater than 3 psi may cause damage to the shaft seal.
• Connect gauge to the gauge port or the nozzle port (see Figure 15 ) to check burner pump pressure.