Lennox Dave Signature XP21 Installation Instructions Manual page 7

STEP 2 -- ELECTRICAL (Continued) -- Outdoor Control (A175) Jumpers and Terminals
(HP ONLY) J4
COMPRESSOR SHIFT DELAY
30
SECOND DELAY
(DEFAULT)
30
0
SECOND DELAY
0
(TWO−STAGE HEAT
PUMP ONLY) J2
SECOND−STAGE LOCK−IN TEMP
55
DEGREE
TARGET
50
DEGREE
TARGET
45
DEGREE
TARGET
40
DEGREE
TARGET (DEFAULT )
SECOND−STAGE LOCK−IN FACTORY
DEFAULT SETTING FOR J2 IS 405F. IF
JUMPER IS REMOVED OR MISSING,
DEFAULT IS OFF.
J1 - DEFROST TERMINATION TEMPERATURE
1. The J1 jumper is factory set to 50°F (10°C). This jumper can also be set to 70°F, 90°F, 100°For MAX
(21°C, 32°C, 38°C and MAX). If a jumper is not present on J1, the default termination temperature is MAX.
NOTE ­ Colder climates could require a higher defrost termination temperature setting 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 default setting is OFF. Note: If the jumper is miss­
ing the default is OFF.
2.
Defrost Auto is set to OFF - Defrost will run and terminate based on J1 setting.
3.
Defrost Auto is set to ON - Defrost termination setting may differ from the actual J1 jumper setting. The
actual 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 control accumulates heating run­time between defrost cycles:
.
S
Heating time between defrost is less than 50 minutes - The defrost termination temperature
will be increased for the next defrost cycle based on current termination setting. If current ter­
mination setting is <70°F then the next defrost termination will be 90°F. If J1 is set at >70°F or
MAX the next defrost termination will be MAX.
S
Heating time between defrosts is longer than 1 hour for 2 consecutive heating cycles
- The defrost termination will be decreased for the next defrost cycle. If the termination is set
at 50°F, 70°F, or 90°F, then defrost termination will follow the J1 jumper setting. If the J1 is set
to MAX, then the next defrost termination will be 90°F.
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 40°F, and J1 is set to MAX, defrost termina­
.
tion will be 90°F. If J1 is to 50°F, 70°F, 90°F or 100°F , defrost termination will follow the J1 setting.
7−SEGMENT
DISPLAY
PUSH
BUTTON
FIGURE 7
Page 7
J3 (HP ONLY)
DEFROST AUTO
JUMPER ON BOTH PINS
DEFROST AUTO ENABLED
OFF
JUMPER ON ONE PIN
DEFROST AUTO DISABLED (DEF AULT)
J1 (HP ONLY)
DEFROST TERMINATION TEMP
100
DEGREE
TARGET
70
DEGREE
TARGET
(MAX DEFROST IS
ENABLED WHEN JUMPER IS
REMOVED OR MISSING)
DS TO R
(TWO−STAGE UNIT ONLY)
®
Cut for Humiditrol − Enhanced
Dehumification Accessory (EDA)
applications.
NOTE − LINK NOT APPLICABLE TO
SINGLE−STAGE UNITS. CUTTING LINK WILL
HAVE NO AFFECT ON OPERATION OF
.
SINGLE−STAGE UNITS
ON
90
DEGREE
TARGET
50
DEGREE
TARGET
(DEFAULT)
XP21 SERIES