Carrier 58CTA/CTX User Manual download pdf (Page 50)

9. Using field--provided 25--caliber rifle cleaning brush,

36--in. (914 mm) long 1/4--in. (6 mm) diameter steel

spring cable, a variable speed, reversible electric drill, and

vacuum cleaner, clean cells as follows:

a. Remove metal screw fitting from wire brush to allow in-

sertion into cable.

b. Insert the twisted wire end of brush into end of spring

cable, and crimp tight with crimping tool or crimp by

striking with ball--peen hammer. TIGHTNESS IS VERY

IMPORTANT.

NOTE: The materials needed in item 9 can usually be purchased

at local hardware stores.

(1.) Attach variable--speed, reversible drill to the end of

spring cable (end opposite brush).

(2.) Insert brush end of cable into the outlet opening of

cell and slowly rotate with drill. DO NOT force

cable. Gradually insert cable into upper pass of cell.

(See Fig. 60.)

(3.) Work cable in and out of cell 3 or 4 times to obtain

sufficient cleaning. DO NOT pull cable with great

force. Reverse drill and gradually work cable out.

(4.) Insert brush end of cable in burner inlet opening of

cell, and proceed to clean 2 lower passes of cell in

same manner as upper pass.

(5.) Repeat foregoing procedures until each cell in fur-

nace has been cleaned.

(6.) Using vacuum cleaner, remove residue from each

cell.

(7.) Using vacuum cleaner with soft brush attachment,

clean burner assembly.

(8.) Clean flame sensor with fine steel wool.

(9.) Install NOx baffles (if removed.)

(10.) Reinstall burner assembly. Center burners in cell

openings.

10. Remove old sealant from cell panel and collector box

flange.

11. Spray releasing agent on the heat exchanger cell panel

where collector box assembly contacts cell panel.

NOTE: A releasing agent such as cooking spray or equivalent

(must not contain corn or canola oil, aromatic or halogenated

hydrocarbons or inadequate seal may occur) and RTV sealant

(G.E. 162, 6702, or Dow--Corning 738) are needed before

starting installation. DO NOT substitute any other type of RTV

sealant. G.E. 162 (P771--9003) is available through RCD in 3--oz.

tubes.

12. Apply new sealant to flange of collector box and attach to

cell panel using existing screws, making sure all screws

are secure.

13. Reconnect wires to the following components (Use con-

nection diagram on wiring label, if wires were not marked

for reconnection locations.):

a. Draft safeguard switch.

b. Inducer motor.

c. Pressure switches.

d. Limit overtemperature switch.

e. Gas valve.

f. Hot surface igniter.

g. Flame--sensing electrode.

h. Flame rollout switches.

14. Reinstall internal vent pipe, if applicable.

15. Reinstall vent connector on furnace vent elbow. Securely

fasten vent connector to vent elbow with 2 field--supplied,

corrosion--resistant, sheet metal screws located 180_ apart.

1-7/8

(47.6 mm)

A05026

Fig. 59 -- Igniter Position--Top View

A91252

Fig. 60 -- Cleaning Heat Exchanger Cell

16. Replace blower access door only, if it was removed.

17. Set thermostat above room temperature and check furnace

for proper operation.

18. Verify blower airflow and speed changes between heating

and cooling.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury,

death and/or property damage.

Never use a match or other open flame to check for gas

leaks. Use a soap--and--water solution.

WARNING

19. Check for gas leaks.

20. Replace outer access door.

Step 3 — Sequence of Operation

NOTE: Furnace control must be grounded for proper operation

or control will lockout. Control is grounded through green wire

connected to gas valve and burner bracket screw. Using the

schematic diagram in Fig. 57, follow the sequence of operation

through the different modes. Read and follow the wiring diagram

very carefully.

NOTE: If a power interruption occurs during a call for heat

(W/W1 or W/W1--and--W2), the control run the blower for the

selected blower off--delay period two seconds after power is

restored and if the thermostat is still calling for gas heating. The

LED light will flash code 12 during this period, after which the

LED will be ON continuous, as long as no faults are detected.

After this period, the furnace will respond to the thermostat

normally.

The blower door must be installed for power to be conducted

through the blower door interlock switch ILK to the furnace

control CPU, transformer TRAN, inducer motor IDM, blower

motor BLWM, hot--surface igniter HSI, and gas valve GV.

58CT

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Carrier 58CTA/CTX User Manual Page 50

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