Bryant R-22 - Page 20

13. Shut off unit power and reconnect fan lead.
14. Remove jumper between DFT and R terminals. Reconnect
defrost-thermostat leads. Failure to remove jumper causes
unit to switch to defrost every 30, 50, or 90 minutes and
remain in defrost for full 10 minutes.
15. Replace control-box cover. Restore power to unit.
If defrost thermostat does not check out following above items or
incorrect calibration is suspected, check for a defective thermostat
as follows.
1. Follow items 1-5 above.
2. Route sensor or probe underneath coil (or other convenient
location) using thermocouple temperature-measuring de-
vice. Attach to liquid line near defrost thermostat. Insulate
for more accurate reading.
3. Turn on power to outdoor unit.
4. Restart unit in heating.
5. Within a few minutes, liquid-line temperature drops within
a range causing defrost-thermostat contacts to close. Tem-
perature range is from 33°Fto27°F. Notice temperature at
which ohmmeter reading goes from ∞ to zero ohms.
Thermostat contacts close at this point.
G
E
W2
14
L
W3
R
Y
O
C
W1
90
50
OF2
OF1
G
C
C
C
R
R
C
Y
O
DFT
HK32FA003/HK32FA006
A88404
OF1
OF2
O
R
T2 Y
TI
DFT
C
TEST
30
50 90
W1
O
R
W2
Y
C
CES0110063,
CES0130024
A91444
Fig. 20—Inserting Jumper Wire
G
E
W2
14
L
W3
R
Y
O
C
W1
30
50
OF2
OF1
G
C
C
C
R
R
C
Y
O
DFT
HK32FA003/HK32FA006
A88403
OF1
OF2
O
R
T2 Y
TI
DFT
C
TEST
30
50 90
W1
O
R
W2
Y
C
CES0110063,
CES0130024
A91443
Fig. 21—Checking Between C and W2
TABLE 10—DEFROST CONTROL SPEED-UP TIMING SE-
QUENCE FOR CES0110063/CES0130024
PARAMETER MINIMUM MAXIMUM
SPEED-UP
(NOMINAL)
30-minute cycle 27 33 7 sec
50-minute cycle 45 55 12 sec
90-minute cycle 81 99 21 sec
10-minute cycle 9 11 2 sec
5 minutes 4.5 5.5 1 sec
—20—