Lennox XP21 Series - Jumpers and Links (103369-01 and -02)

Page 26
XP21
Jumper and Links (103369-03)
55
50
DEGREE
TARGET
45
DEGREE
TARGET
40
DEGREE
TARGET (DEFAULT)
55
50
45
40
55
50
45
40
55
50
45
40
55
50
45
40
DEGREE
TARGET
30
0
30
SECOND DELAY
SECOND DELAY
0
CUT FOR HUMIDITROL
®
- ENHANCED
DEHUMIFICATION ACCESSORY (EDA)
APPLICATIONS.
SECOND-STAGE LOCK-IN
TEMPERATURE
J4 - COMPRESSOR
SHIFT DELAY
DS TO R LINK - EDA APPLICATION
J2 - SECOND-STAGE
LOCK-IN
TEMPERATURE
(DEFAULT)
7-SEGMENT DISPLAY
PUSH BUTTON
NOTE - LINK NOT APPLICABLE TO SINGLE-STAGE
UNIT. CUTTING LINK WILL HAVE NO AFFECT ON
OPERATION OF SINGLE-STAGE UNITS
.
MAX
90
DEGREE
TARGET
70
DEGREE
TARGET
50
DEGREE
TARGET
90
70
50
TARGET
90
70
50
90
70
50
MAX
90
70
50
J1 - DEFROST TERMINATION
TEMPERATURE
J3 - DEFROST AUTO
OFF
ON
JUMPER ON PINS 1 AND 2
DEFROST AUTO ENABLED
DEFROST AUTO DISABLED (DEFAULT)
90
70
50
(DEFAULT)
(DEFAULT WHEN JUMPER IS
REMOVED OR MISSING)
90
MAX
MAX
MAX
MAX
JUMPER ON PINS 2 AND 3
(HEAT PUMP ONLY)
(TWO-STAGE HEAT PUMP ONLY)
(TWO-STAGE UNIT ONLY)
(HEAT PUMP ONLY)
J1 - DEFROST TERMINATION TEMPERATURE
1. The J1 jumper is factory-set to 50°F (10°C). This jumper can repositioned to terminate defrost at 70°F,
90°F or MAX ( 21°C, 32°C and MAX). If there is no jumper on J1, the default termination temperature
is 90°F(325C).
NOTE  Colder climates may require a higher defrost termination temperature to maintain a clear coil.
2. If the J1 jumper is set to MAX, defrost will run maximum defrost sequence.
J3 - DEFROST AUTO
1. Defrost Auto can be set to either ON or OFF. Factory setting is OFF.
Note: If the jumper is missing the default is OFF.
2. Defrost Auto is set to OFF, the defrost cycle will run and terminate based on J1 setting.
3. Defrost Auto is set to ON, the defrost termination will be determined based on the following rules:
A.
. The first defrost after the unit is powered up, or the first defrost after cooling call , will terminate
based on the J1 setting.
B.. The accumulated heating runtime between defrost cycles:
 If the heating run time between defrost cycles is less than 50 minutes, the defrost ter
mination temperature will be increased for the next defrost cycle based on the current ter
mination setting. If the current termination setting is 50ºF or 70ºF, then the next defrost ter
mination will be 90ºF. If J1 is set at 90ºF or MAX, the next defrost cycle will terminate at the
MAX setting.
 If the heating run time between defrosts is longer than 1 hour for 2 consecutive heat
ing cycles and the termination temperature is set at 50ºF, 70ºF, or 90ºF, then the defrost
control will follow the JI jumper setting during the next defrost cycle. If the J1 jumper is set
to MAX, then the next defrost termination temperature will be decreased to 90ºF.
C.
. If J1 is set to MAX, the system will always run at MAX when accumulated compressor OFF time
is longer than 30 minutes and ambient temperature is less than 35°F
.
D.
. When the ambient sensor temperature is higher than 40ºF and J1 is set to MAX, defrost termin
ation will be 90ºF. If J1 is 50ºF, 70ºF, or 90ºF, defrost termination will follow the J1 setting.
Figure 11. Jumpers and Links (Outdoor Control Part Number 103369-03)