Carrier 59MN7A Instruction Manual download pdf (Page 79)

UNIT COMPONENT DAMAGE HAZARD

Failure to follow this caution may result in damage to the

furnace and other property damage.

Do not use ethylene glycol (automotive antifreeze coolant or

equivalent). Failure of plastic components may occur.

CAUTION

1. Obtain propylene glycol (RV/swimming pool antifreeze or

equivalent).

2. Turn off gas and electrical supplies to your furnace.

3. Remove furnace control door.

4. Remove the top unused rubber plug from the port on the

collector box opposite the condensate trap. See Fig. 57.

5. Connect a field supplied 3/8--in. (9.5--mm) ID tube to the

open port on the collector box

6. Insert a field supplied funnel into the tube.

7. Pour 1 quart of anti--freeze solution into the funnel/tube.

Antifreeze should run through the inducer housing, overfill

condensate trap and flow to an open drain.

8. Replace the rubber plug in the port on the collector box.

9. Remove the middle unused rubber plug from the port on the

collector box opposite the condensate trap. See Fig. 57

10. Repeat Steps 5 through 8.

11. If a condensate pump is used, check with pump

manufacturer to verify pump is safe for use with antifreeze

used. Allow pump to start and pump anti--freeze to open

drain.

12. Replace main door.

13. When furnace is re--started, flush condensate pump with

clear water to check for proper operation before re--starting

furnace.

14. Propylene glycol need not be removed before re--starting

furnace.

2-1/2-in.

(64.4)

1-1/4-in.

(31.8)

A11405

Fig. 55 -- Igniter Position -- Top View

2−in.

2.5 mm

3/8−in.

3/16−in.

+0.8

−1.5

50 mm

9.6 mm

4.6 mm

A11620

Fig. 56 -- Igniter Position -- Side View

A11392

Fig. 57 -- Priming Condensate Trap

(Appearance May Vary)

A11273

Fig. 58 -- Cleaning Heat Exchanger Cell

Burner Flame

Burner

Manifold

A11461

Fig. 59 -- Burner Flame

59MN7A

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Carrier 59MN7A Instruction Manual Page 79

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