Bryant 912S Installation, Operating And Service Instructions Download

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To re-install Condensate Drain and Trap:

1. Remove adhesive backing from condensate trap gasket

2. Install gasket on collector box

3. Align the condensate trap with the drain opening on the col-

lector box and secure the trap with the screw

4. Attach the relief hose to the relief port on the condensate

trap and collector box.

5. Secure tubing to prevent any sags or traps in the tubing.

6. Connect condensate drain elbow or drain extension elbow

to the condensate trap

7. Connect the leads of the condensate heat pad (if used)

8. Connect external drain piping to the condensate drain elbow

or drain extension pipe.

9. Turn gas on at electric switch on gas valve and at external

shut-off or meter

10. Turn power on at external disconnect, fuse or circuit break-

er.

11. Run the furnace through two complete heating cycles to

check for proper operation

12. Install control door when complete.

Checking Heat Pad Operation (If Applicable)

In applications where the ambient temperature around the furnace

is 32

F or lower, freeze protection measures are required. If this

application is where heat tape has been applied, check to ensure it

will operate when low temperatures are present.

NOTE:

The Heat Pad, when used, should be wrapped around the

condensate drain trap. There is no need to use heat tape within the
furnace casing. Most heat tapes are temperature activated, and it is
not practical to verify the actual heating of the tape. Check the
following:

1. Check for signs of physical damage to heat tape such as

nicks, cuts, abrasions, gnawing by animals, etc.

2. Check for discolored heat tape insulation. If any damage or

discolored insulation is evident, replace heat tape.

3. Check that heat tape power supply circuit is on.

Cleaning Heat Exchangers

The following items must be performed by a qualified service

technician.

Primary Heat Exchangers

If the heat exchangers get an accumulation of light dirt or dust on

the inside, they may be cleaned by the following procedure:

NOTE:

If the heat exchangers get a heavy accumulation of soot

and carbon, both the primary and secondary heat exchangers
should be replaced rather than trying to clean them thoroughly due
to their intricate design. A build

−

up of soot and carbon indicates

that a problem exists which needs to be corrected, such as improper
adjustment of manifold pressure, insufficient or poor quality
combustion air, improper vent termination, incorrect size or
damaged manifold orifice(s), improper gas, or a restricted heat
exchanger (primary or secondary). Action must be taken to correct
the problem.

1. Turn off gas and electrical supplies to furnace.

ELECTRICAL SHOCK, FIRE OR EXPLOSION

HAZARD

Failure to follow this warning could result in personal

injury or death, or property damage.
Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the OFF position and

install a lockout tag. There may be more than one

disconnect switch. Lock out and tag switch with a suitable

warning label. Verify proper operation after servicing.

Always reinstall access doors after completing service and

maintenance.

WARNING