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10/08

*2P1008*

505,111M

*P505111M*

SGA420, 480, 540, 600

©

2006

Litho U.S.A.

505,111M
10/2008
Supersedes 4/2006

WHAT TO DO IF YOU SMELL GAS:

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings ex-
actly could result in serious injury
death or property damage.

WARNING

Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.

Installation and service must be per-
formed by a qualified installer, ser-
vice agency or the gas supplier.

D

Do not try to light any appliance

.

D

Do not touch any electrical switch; do not
use any phone in your building.

D

Immediately call your gas supplier from a
neighbor’s phone. Follow the gas suppli-
er’s instructions.

D

If you cannot reach your gas supplier, call
the fire department.

D

Extinguish any open flames.

ROOFTOP

UNITS

READ ALL INSTRUCTIONS IN THIS MANUAL

AND RETAIN FOR FUTURE REFERENCE

See unit nameplate for manufacturer
and address.

(35, 40, 45 and 50 TONS)

D

Leave the building immediately.

Summary of Contents for SGA420

Page 1: ...on and service must be per formed by a qualified installer ser vice agency or the gas supplier D Do not try to light any appliance D Do not touch any electrical switch do not use any phone in your bui...

Page 2: ...COILS OPTIONAL BURNERS GAS VALVES 2 CONDENSER COILS 4 CONTROL BOX COMPRESSORS 4 CONDENSER FANS 6 BLOWERS FILTERS ELEVEN 16 x 25 x 2 406 x 635 x 51mm OR 16 X 25 X 4 406 X 635 X 102mm ECONOMIZER OPTION...

Page 3: ...errors can cause improper and dangerous operation Verify proper operation after servicing WARNING Danger of electrical shock explosion and fire Improper servicing could result in dangerous operation...

Page 4: ...llow the gas supplier s instructions If you do not smell gas go to the next step 7 Turn the knob on the gas valve counterclockwise to ON Do not force 8 Close or replace the heat section access panel 9...

Page 5: ...Service To maintain efficiency and longevity your equipment must be serviced yearly by a qualified service technician Failure to provide proof of service can void warranty CAUTION Label all wires prio...

Page 6: ...t the position of the flame sensor Sensor should be centered in the path of the flame 3 Before each heating season examine the burners for any deposits or blockage which may have occurred Clean burner...

Page 7: ...e box cover Clean the flue box with a wire brush as required 3 Clean the tubes with a wire brush 4 Reassemble the unit The flue box cover gasket and combustion air inducer gasket should also be replac...

Page 8: ...8 The unit will operate at maximum heating input 3 Measure the manifold pressure at the gas valves Manifold pressures should be GV1 GV3 Natural 4 0 w c LP 10 8 w c GV4 GV5 Natural 3 7 w c LP 10 5 w c...

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