Lennox SL18XP1 Installation Instruction page 7

STEP 2 -- ELECTRICAL (Continued) -- Outdoor Control (A175) Jumpers and Terminals
J4 - COMPRESSOR
SHIFT DELAY
30
SECOND DELAY
(DEFAULT)
30
0
SECOND DELAY
J2 - SECOND-STAGE
LOCK-IN
TEMPERATURE
(TWO-STAGE HEAT PUMP ONLY)
55
DEGREE
TARGET
50
DEGREE
TARGET
45
DEGREE
TARGET
40
DEGREE
TARGET (DEFAULT)
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
0
SECOND-STAGE LOCK-IN
TEMPERATURE
PUSH BUTTON
J1 - DEFROST TERMINATION
TEMPERATURE
TARGET
DEGREE
TARGET
DEGREE
TARGET
DS TO R LINK - EDA
APPLICATION
(TWO-STAGE UNIT ONLY)
NOTE - LINK NOT APPLICABLE TO SINGLE-STAGE
UNIT. CUTTING LINK WILL HAVE NO AFFECT ON
OPERATION OF SINGLE-STAGE UNITS
CUT FOR HUMIDITROL
DEHUMIFICATION ACCESSORY (EDA)
APPLICATIONS.
FIGURE 7
Page 7
J3 - DEFROST AUTO
(HEAT PUMP ONLY)
JUMPER ON PINS 1 AND 2
DEFROST AUTO ENABLED
JUMPER ON PINS 2 AND 3
DEFROST AUTO DISABLED (DEFAULT)
(HEAT PUMP ONLY)
MAX
(DEFAULT WHEN JUMPER IS
90
REMOVED OR MISSING)
50
DEGREE
70
TARGET
(DEFAULT)
®
- ENHANCED
ON
OFF
90
.
SL18XP1 SERIES