Page 12
XP17
MULTI-FUNCTION TEST PINS (E33)
Placing the jumper on the field test pins (E33) using a specific sequence allows the technician to:
Clear short cycle lockout
Clear five-strike fault lockout
Cycle the unit in and out of defrost mode
Manually place the unit in defrost mode to clear the coil
When
Y1
is energized and 24V power is being applied to the heat pump control (A175), a test cycle can be initiated by placing a jumper on the heat
pump control's
TEST
pins for 2 to 5 seconds. If the jumper remains on the
TEST
pins (E33) for longer than five seconds, the heat pump control will
ignore the jumpered TEST pins and revert to normal operation.
The heat pump control will initiate one test event each time a jumper is placed on the TEST pins.
For each TEST the jumper must be removed
for at least one second and then reapplied.
Y1
Active
Place a jumper on TEST pins for
longer than one second but less
than two seconds.
Clears any short cycle lockout and
five strike fault lockout function, if
applicable. No other functions will
be executed and unit will continue in
the mode it was operating.
Place a jumper on TEST pins for
more than two seconds
.
Clears any short cycle lockout and
five strike fault lockout function, if
applicable.
If in
HEATING
Mode
If in
DEFROST
Mode
No further test mode operation will
be executed until the jumper is
removed from the TEST pins and
reapplied.
If no ambient or coil sensor fault ex-
ist, unit will go into DEFROST
MODE.
If ambient or coil faults exist (open
or shorted), unit will remain in
HEAT MODE.
The unit will terminate defrost and
enter HEAT MODE uncalibrated
with defrost timer set for a maximum
34 minute test.
If jumper on TEST pins remains in
place for more than five seconds.
The unit will return to HEAT MODE
un
−
calibrated with defrost timer set
for 34 minutes.
If jumper on TEST pins is removed
before a maximum of five seconds.
The unit will remain in DEFROST
MODE until termination on time or
temperature.
O
Line Status
INACTIVE
ACTIVE
If in
COOLING
Mode
NOTE — If ambient or coil fault is detected, the board
will not execute the TEST mode.
NOTE — Heat pump control cannot be force into
defrost mode when the ambient temperature input
from the RT13 sensor is above 65ºF (18ºC).
Figure 7. Test Pin (E33) Functions
Summary of Contents for iComfort SL18XC1 Series
Page 44: ...Page 44 XP17 Figure 21 Typical XP17 Wiring XP17 XX 230 06...
Page 45: ...Page 45 XP17 Factory Wiring Diagrams Figure 22 Typical Factory Wiring XP17 XX 230 01...
Page 46: ...Page 46 XP17 Figure 23 Typical Factory Wiring XP17 XX 230 02...
Page 47: ...Page 47 XP17 Figure 24 Typical Factory Wiring XP17 XX 230 03 and 05...
Page 48: ...Page 48 XP17 Figure 25 Typical Factory Wiring XP17 XX 230 06...
