Bryant 698B Cooling only Procedure, Heating Check Charge Procedure, Cooling Operation

Adjust charge in both heating and cooling by following procedure shown on charging tables located on pink charging label on back side of access panel.

NOTE: Unit is to be charged in high capacity only. Charging in low capacity may cause compressor chattering and possible damage to the compressor.

B.COOLING ONLY PROCEDURE

1.Operate unit a minimum of 15 minutes before checking charge.

2.Measure liquid service valve pressure by attaching an accurate gage to service port.

3.Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil.

4.Refer to charging label for required subcooling tempera- tures.

5.Refer to Table 3. Find the point where required subcooling temperature intersects measured liquid service valve pres- sure.

6.To obtain required subcooling temperature at a specific liquid line pressure, add refrigerant if liquid line tempera- ture is higher than indicated or reclaim refrigerant if temperature is lower. Allow a tolerance of ± 3 °F.

C.HEATING CHECK CHARGE PROCEDURE

To check system operation during heating cycle, refer to the Heating Pump Charging Instructions on outdoor unit. This chart indicates whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units. If pressure and temperature do not match on chart, system refrigerant charge may not be correct. Do not use chart to adjust refrigerant charge.

CEBD430439-03A

SS0ID

R38
R33	R9
J1

NOTE: In heating mode, check refrigerant charge only when pressures are stable. If accessory vapor pressure switch is applied and operating conditions cause vapor pressure switch and thereby outdoor fan to cycle, check refrigerant charge in cooling or lower indoor dry bulb temperature. If in doubt, remove charge and weigh in correct refrigerant charge.

NOTE: When charging is necessary during heating season, charge must be weighed in accordance with unit rating plate ±0.6 oz/ft of 3/8-in. liquid line above or below 15 ft respectively.

EXAMPLE:

To calculate additional charge required for a

25-ft line set:

25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge.

XIII. SYSTEM FUNCTIONS AND SEQUENCE OF OP- ERATION

The outdoor unit control system has special functions. The following is an overview of the two-speed control functions:

A. COOLING OPERATION

This product utilizes a 2-stage cooling indoor thermostat. With a call for first stage cooling (Yl), the outdoor fan and low capacity compressor are energized. If low capacity cannot satisfy cooling demand, high capacity is energized (Yl and Y2 or just Y2) by the second stage of indoor thermostat. After second stage is satisfied, the unit returns to low-capacity operation until first stage is satisfied or until second stage is required again. When both one stage and two stage cooling are satisfied, the compressor will shut off.

NOTE: Outdoor fan motor will continue to operate for one minute after compressor shuts off, when outdoor ambient is greater than 100°F.

C2	HP/AC	SEV	RVS	C	HI	LO
							1
				PL1		PL2

LPS

C31
R61
R65
DEFROST	FORCED				DEFROST
				TIME (MIN)
S1	120					R39
						R44
30			60			R42
						C18
						C16
60	1	2	30			R36
	90
0
Y2
Y1
W1						C O M M S TAT U S
C
R							D51	D52

1

1

PWM2

PWM1

CEPL130439-01

PL3

HPS

PL4

OAT

OCT

PL5

BRN	VC
BLU	VH
BLK	ODF
YEL
	L2

A B C D

	R89		K1	RED	CCH
R85
		R91

R86 R87 C E S O 1 3 0 0 7 8 - 0 0

A00379

Fig. 15—Control Board

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