Bryant 589A, 588A START-UP Check for Refrigerant Leaks, Check Heating Control, Check Gas Input

a.Before lighting the unit for the ®rst time, perform the following: If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended that the ground joint union be loos- ened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion chamber. Immediately upon detection of gas odor, retighten the union. Allow 5 minutes to elapse, then light unit.

b.Make sure that condenser-fan blade is correctly po- sitioned in fan ori®ce. Leading edge of condenser-fan blade should be 1¤2 in. maximum from plastic fan ori- ®ce (see Fig. 23).

c.Make sure that air ®lter(s) is in place.

d.Make sure that condensate drain trap is ®lled with water to ensure proper drainage.

e.Make sure that all tools and miscellaneous loose parts have been removed.

Fig. 23 Ð Fan Blade Clearance

START-UP

I. CHECK FOR REFRIGERANT LEAKS

Proceed as follows to locate and repair a refrigerant leak and to charge the unit:

1.Locate leak and make sure that refrigerant system pres- sure has been relieved and reclaimed from both high- and low-pressure ports.

2.Repair leak following accepted practices.

NOTE: Install a ®lter drier whenever the system has been opened for repair.

3.Add a small charge of R-22 refrigerant vapor to system and leak-test unit.

4.Evacuate and reclaim refrigerant from refrigerant sys- tem if additional leaks are not found.

5.Charge unit with R-22 refrigerant, using a volumetric- charging cylinder or accurate scale. Refer to unit rating plate for required charge. Be sure to add extra refriger- ant to compensate for internal volume of ®lter drier.

II.START UP HEATING SECTION AND MAKE ADJUSTMENTS

CAUTION: Complete the required procedures given in Pre-Start-Up section on page 22 before starting the unit.

Do not jumper any safety devices when operating the unit.

Make sure that burner ori®ces are properly aligned. Un- stable operation may occur when the burner ori®ces in the manifold are misaligned.

Follow the lighting instructions on the heating section operation label (located inside the burner or blower access door) to start the heating section.

NOTE: Make sure that gas supply has been purged, and that all gas piping has been checked for leaks.

A. Check Heating Control

Start and check the unit for proper heating control operation as follows. (See furnace lighting instructions located inside burner or blower access panel.)

1.Place the room thermostat SYSTEM switch in the HEAT position and the fan switch in the AUTO. position.

2.Set the heating temperature control of the thermostat above room temperature.

3.The induced-draft motor will start.

4.After a call for heating, the main burner should light within 5 seconds. If the burners do not light, there is a 22-second delay before another 5-second try. If the burn- ers still do not light, this sequence is repeated. If the burners do not light within 15 minutes from the initial call for heat, there is a lockout. To reset the control, break the 24-v power to W.

5.The evaporator fan will turn on 45 seconds after the flame has been established. The evaporator fan will turn off 45 seconds after the thermostat has been satis®ed.

B.Check Gas Input

Check gas input and manifold pressure after unit start-up. (See Table 5.) If adjustment is required proceed as follows.

The rated gas inputs shown in Table 5 are for altitudes from sea level to 2000 ft above sea level. These inputs are based on natural gas with a heating value of 1050 Btu/ft3 at 0.65 speci®c gravity, or propane gas with a heating value of 2500 Btu/ft3 at 1.5 speci®c gravity. For elevations above 2000 ft, reduce input 4% for each 1000 ft above sea level. When the gas supply being used has a different heating value or spe- ci®c gravity, refer to national and local codes, or contact your distributor to determine the required ori®ce size.

CAUTION: These units are designed to consume the rated gas inputs using the ®xed ori®ces at speci®ed mani- fold pressures as shown in Table 5. DO NOT REDRILL THE ORIFICES UNDER ANY CIRCUMSTANCES.

C. Adjust Gas Input

The gas input to the unit is determined by measuring the gas ¯ow at the meter or by measuring the manifold pressure. Measuring the gas ¯ow at the meter is recommended for natu- ral gas units. The manifold pressure must be measured to determine the input of propane gas units.

Ð23Ð