Carrier 48EZ(N)-A Spezifikationen PDF herunterladen (Seite 6)

Table 2 - Two-Stage Sequence of Operations

Inducer Pre-Purge Period: When the inducer motor comes up on high speed, the pressure switch closes, and the Infinity _ ignition control

on the furnace board begins a 15 sec pre-purge period. If the pressure switch fails to remain closed, the inducer will remain running. After

the pressure switch recloses, the Infinity ignition control will begin a 15 sec pre-purge period.

Trial-for-Ignition Sequence: The spark igniter will spark for 3 sec, the main gas valve relay contact closes to energize the gas valve on low

stage. After 5 sec, the igniter is de-energized and a 2-sec flame-proving period begins.

NOTE: The unit always lights on high speed inducer and low stage gas valve operation.

Flame-Proving: When the burner flame is proved at the flame-proving sensor, the furnace control determines what heating stage to run

based on feedback from the User Interface (UI). If the UI is asking for low stage gas heat, the ignition control will change the inducer speed

to low speed and keep the gas valve energized on low stage. If the UI is asking for high stage gas heat, the ignition control will maintain

running the inducer on high speed and energize the gas valve's high stage relay to increase gas flow.

Table 3 - Two-Stage Rated Heating Input, Propane Gas (2001-6000 ft [610-1829 m] Altitude)

RATED HEATING INPUT PROPANE(BTU/HR)

NAMEPLATE INPUT, HIGH STAGE (BTU/HR)

40,000

60,000

90,000

115,000

130,000

HIGH STAGE

38,000

57,000

79,000

103,000

116,000

LOW STAGE

26,000

39,000

58,500

75,000

84,500

FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal

iniury and/or property damage.

Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifically for

the detection of leaks to check all connections. A fire or

explosion may result causing property damage, personal

iniury of loss of life,

MANIFOLD PIPE PLUG

099019

Fig. 5 - Two-Stage Burner Assembly

BURNER FLAME

(Blue in appearance)

BURNER

MANIFOLD

Fig. 6 - Monoport Burner

C99021

IMPORTANT: Restart unit and leak check all gas connections

including the main service connection, gas valve, gas spuds, and

manifold pipe plug. All leaks must be repaired before firing unit.

32. Fire unit and verify proper ignition and proper sequence of

operation (Table 2). See Table 4 for proper low stage and

high stage manifold pressure settings for your unit. Adjust

the gas valve setting for high and low stages by turning the

plastic adjustment screws clockwise to increase pressure and

counter-clockwise to decrease pressure for the respective

stages. Refer to Table 3 for required rated heating input

rates. Replace regulator cover screws when finished (see

Fig. 3).

33. With control access panel removed, observe unit heating

operation in both low stage operation and high stage opera-

tion. Watch burner flames to see if they are blue in appear-

ance, and that the flames are approximately the same for

each burner (see Fig. 6).

34. Turn off unit, remove pressure manometer and replace the

1/8 in. pipe fitting on the gas manifold (see Fig. 5).

35. Attach warning label (P/N 48DU500076) to visible side of

gas valve.

36. Attach conversion label (P/N 48VL500285) above unit

rating plate on exterior of unit.

37. Attach completed conversion responsibility label (see Fig.

8, P/N 48VL500286) inside service access panel.

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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