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Bryant R-22 User Manual

Page 45

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2. Measure liquid service-valve pressure by attaching an

accurate gage to the service port.

3. Measure the liquid-line temperature by attaching an accu-

rate thermistor-type or electronic thermometer to the liquid
line near the outdoor coil.

4. Refer to unit-rating plate to find required subcooling

temperature for units produced during or after January
1993. For units produced through December 1992, refer to
Table 23. Find the point at which the required subcooling
temperature intersects the measured liquid service-valve
pressure on Table 24.

5. To obtain the required subcooling temperature at a specific

liquid-line pressure, add refrigerant if liquid-line tempera-
ture is higher than indicated or remove refrigerant if
temperature is lower. Allow a tolerance of 3°F.

CARE AND MAINTENANCE

To assure high performance and minimize possible equipment
malfunction, it is essential that maintenance be performed periodi-

cally on this equipment. The frequency with which maintenance is
performed is dependent on such factors as hours of operation,
geographic location, and local environmental conditions.

WARNING:

Disconnect all electrical power to unit

before performing any maintenance or service on outdoor
unit. Remember to disconnect power supply to air handler
as this unit supplies low-voltage power to the outdoor
unit. Electric shock can cause personal injury or death.

The minimum maintenance that should be performed on this
equipment is as follows.

1. Check outdoor coil for cleanliness each month during the

heating (heat pump only) or cooling season and clean as
necessary, but clean at least once each heating (heat pump
only) and cooling season.

2. Check fan motor and blade for cleanliness each heating and

cooling season and clean as necessary.

TABLE 23—SUBCOOLING AT LIQUID-SERVICE VALVE FOR UNITS PRODUCED THROUGH DECEMBER, 1992

RELIANT AIR CONDITIONERS

Model

590A

591A/592A

593A/594A

593B

593C

594C

595A

596A

597A

597B

598A

High

598A

Low

Series

A

B

C

A

B

C

D

A

B

C

D

A

B

A

B

A

B

A

A

A

A

A

A

014

14

14

14

14

14

6

6

018

17

17

14

14

14

7

7

11

9

9

9

8

024

13

13

17

17

17

8

8

13

16

21

12

13

12

11

13

030

15

15

9

10

10

6

6

10

13

11

15

15

14

10

9

10

11

036

13

12

16

16

16

12

12

5

9

13

12

16

14

13

12

14

12

9

038

16

042

13

13

14

16

19

19

15

12

12

11

13

21

11

11

15

15

048

15

14

18

14

18

14

14

18

17

14

10

10

11

11

12

9

060

19

22

18

18

18

14

14

11

16

19

12

11

12

9

RELIANT HEAT PUMPS

Model

690A

691A/692A

693A/694A

693B

693C

694C

697A

697B

698A

Cooling

Heating

High

Low

High

Low

Series

A

B

C

D

A

B

A

B

A

A

A

A

A

A

A

A

A

014

7

7

7

018

18

18

18

16

16

11

11

10

9

7

9

10

024

18

18

18

16

16

11

11

13

6

5

11

11

030

13

13

13

20

20

10

10

11

10

10

9

10

036

18

18

18

14

14

10

10

11

13

12

9

10

12

7

18

15

042

13

11

11

18

18

15

15

12

10

12

11

12

048

22

17

15

14

19

14

13

13

15

12

10

11

14

9

25

18

060

23

23

23

13

13

14

14

15

10

12

7

14

9

22

21

MODEL

CUBE UNIT—AIR CONDITIONERS

CUBE UNIT—HEAT PUMPS

HORIZONTAL AIR CONDITIONERS

561A/571A

661A/671A

566D

566E

Series

A

B

A

B

C

D

A

014

10

018

15

16

11

14

12

17

024

14

11

14

8

19

030

12

12

9

10

12

036

18

16

11

7

042

18

17

7

048

17

12

060

21

10

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