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Controls, Start-Up, Operation, Service and ... - Climayoreo

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ight side of the unit (when facing return air end). See Fig. 40-<br />

42. All gas system components are in the gas section.<br />

MAIN BURNERS (48P Only) — At the beginning of each<br />

heating season, inspect for deterioration due to corrosion or<br />

other causes. Observe the main burner flames <strong>and</strong> adjust if necessary.<br />

See Gas System Adjustment section on page 163.<br />

FLUE GAS PASSAGEWAYS (48P Only) — The flue collector<br />

box <strong>and</strong> heat exchanger cells may be inspected by<br />

removing heat exchanger access panel, flue box cover, <strong>and</strong><br />

main burner assembly (Fig. 43). Refer to Main Burners<br />

Removal <strong>and</strong> Replacement section on page 163 for burner<br />

REMOTE<br />

CCN SITE<br />

BUILDING SUPERVISOR<br />

NON CARRIER<br />

HVAC<br />

EQUIPMENT<br />

NETWORK<br />

OPTIONS<br />

AUTODIAL<br />

GATEWAY<br />

COMFORT<br />

CONTROLLER<br />

CCN BUS<br />

TERMINAL<br />

SYSTEM<br />

MANAGER<br />

LEGEND<br />

CCN — Carrier Comfort Network ®<br />

CL — ComfortLink <strong>Controls</strong><br />

DAV — Digital Air Volume<br />

HVAC — Heating, Ventilation, <strong>and</strong> Air Conditioning<br />

TCU — Terminal Control Unit<br />

CL<br />

CL<br />

ROOFTOP<br />

UNIT<br />

ROOFTOP<br />

UNIT<br />

CL<br />

ROOFTOP<br />

UNIT<br />

138<br />

removal sequence. If cleaning is required, remove heat<br />

exchanger baffles <strong>and</strong> clean tubes with a wire brush.<br />

Use caution with ceramic heat exchanger baffles. When installing<br />

retaining clip, be sure the center leg of the clip extends<br />

inward toward baffle. See Fig. 44.<br />

COMBUSTION-AIR BLOWERS (48P Only) — Clean periodically<br />

to assure proper airflow <strong>and</strong> heating efficiency.<br />

Inspect blower wheel every fall <strong>and</strong> periodically during heating<br />

season. For the first heating season, inspect blower wheel<br />

bi-monthly to determine proper cleaning frequency.<br />

HEATING/COOLING UNITS<br />

TCU<br />

DAV AIR<br />

TERMINAL<br />

TCU<br />

DAV AIR<br />

TERMINAL<br />

ROOFTOP<br />

UNIT<br />

TCU<br />

AIR DISTRIBUTION-DIGITAL AIR VOLUME CONTROL (DAV)<br />

Fig. 36 — CCN System Architecture<br />

CL<br />

CL<br />

ROOFTOP<br />

UNIT<br />

TO<br />

ADDITIONAL<br />

TERMINALS<br />

DAV FAN<br />

POWERED<br />

MIXING<br />

BOX

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