Filter
Top Products
SEQUENCE OF OPERATION
Ⅲ HEAT/COOL UNITS
(Figure 50)
Fan Mode — With the selector switch set to FAN and
the fan switch set to fan cycle, contacts L1 to LO and
FCS1 to LS are made.
Cooling (Low) — With the selector switch set to low
speed cooling and the fan switch set to fan cycle, contacts
FCS2 to LO, COMP to FCS1, and COMP to IT3 are
made.
NOTE: The contact in low cooling sequence of operation
for FCS2 is MED on units built prior to 1996.
Cooling (High) — With the selector switch set to high
speed cool and the fan switch set to fan cycle, contacts
FCS2 to HI, COMP to FCS1, and COMP to IT3 are made.
Heating (Low) — With the selector switch set to low
speed heat and the fan switch set to fan cycle, contacts
FCS2 to LO, IT1 to LS, L2 to HTR, and FCS1 to LS
are made.
NOTE: The contact in low heating sequence of operation
for FCS2 is MED on units built prior to 1996.
Heating (High)
— With the selector switch set to high
speed heat and the fan switch set to fan cycle, con-
tacts FCS2 to HI, IT1 to LS, L2 to HTR, and FCS1 to
LS are made.
Ⅲ
COOLING ONLY UNITS (Figure 51)
Fan Mode — With the selector switch set to FAN and
the fan switch set to fan cycle, contact L1 to LO is made.
Cooling (Low) — With the selector switch set to low
speed cooling and the fan switch set to fan cycle, contacts
FCS to LO and L1 to IT3 are made.
NOTE: The contact in low cooling sequence of operation
for FCS2 is MED on units built prior to 1996.
Cooling (High) — With the selector switch set to high
speed cool and the fan switch set to fan cycle, contacts
FCS to HI, L1 to IT3 are made.
Ⅲ HEAT PUMP UNITS (Figure 52)
Fan Mode — With the selector switch set to fan cycle,
contacts L1 to LO are made.
Cooling (Low) — With the selector switch set to low
cool and the fan switch set to fan cycle, contacts L1 to
IT3 and FCS to LO are made.
NOTE: The contact in low cooling sequence of operation
for FCS2 is MED on units built prior to 1996.
Cooling (High) — With the selector switch set to high
cool and the fan switch set to fan cycle, contacts L1 to
IT3 and FCS to HI are made.
Heating (Low) — With the selector switch set to low
heat and the fan switch set to fan cycle, contacts L1 to
IT1, FCS to LO and L2 to HTR are made.
Heating (High) — With the selector switch set to high
heat and the fan switch set to fan cycle, contacts L1 to
IT1, FCS to HI, and L2 to HTR are made.
Defrost Cycle — When heat pump unit is operating in
reverse cycle, the outdoor coil may begin to frost. As frost
accumulates on the outdoor coil the unit may switch
into defrost mode. The defrost mode is activated when
the outdoor frost thermostat sensor detects a tem-
perature below 15 F on the coil. At this point, the ther-
mostat deenergizes the compressor and activates the
electric heat. The unit will remain in electric heat mode
until the outdoor thermostat senses 35 F. The defrost
mode is a passive operation and may take some time be-
fore the coil defrosts.
SWITCH
POSITION
CONTACTS MADE
OFF FCS TO LS
FAN L1 TO LO*, FCS1 TO LS
LO HEAT FCS2 TO LO, IT1 TO LS, L2 TO HTR, FCS1 TO LS
HI HEAT FCS2 TO HI, IT1 TO LS, L2 TO HTR, FCS1 TO LS
LO COOL FCS2 TO LO, COMP TO FCS1, COMP TO IT3
HI COOL FCS2 TO HI, COMP TO FCS1, COMP TO IT3
*L1 to MED, some models.
FIGURE 50 — SELECTOR SWITCH CONTACTS,
ALL 52SE AA AND CP MODELS
SWITCH
POSITION
CONTACTS MADE
OFF NONE
FAN L1 TO LO*
LO COOL L1 TO IT3, FCS TO LO
HI COOL L1 TO IT3, FCS TO HI
*L1 to MED, some models.
FIGURE 51 — SELECTOR SWITCH CONTACTS,
ALL 52SC AA AND CP MODELS
SWITCH
POSITION
CONTACTS MADE
OFF NONE
FAN L1 TO LO*
LO HEAT L1 TO IT1, FCS TO LO, L2 TO HTR
HI HEAT L1 TO IT1, FCS TO HI, L2 TO HTR
LO COOL L1 TO IT3, FCS TO LO
HI COOL L1 TO IT3, FCS TO HI
*L1 to MED, some models.
FIGURE 52 — SELECTOR SWITCH CONTACTS,
ALL 52SQ AA AND CP MODELS
52S
SERIES
26