52C,P
SERIES
SEQUENCE OF OPERATION
■HEAT/COOL UNITS (Figure 45)
Fan Mode — With the selector switch set to FAN con- tacts L1 to HI and FCS1 to LS are made.
Cooling (Low) — With the selector switch set to low speed cooling contacts FCS2 to LO, COMP to FCS1, and COMP to IT3 are made.
Cooling (High) — With the selector switch set to high speed cool contacts FCS2 to HI, COMP to FCS1, and COMP to IT3 are made.
Heating (Low) — With the selector switch set to low speed heat contacts FCS2 to LO, IT1 to LS, L2 to HTR, and FCS1 to LS are made.
Heating (High) — With the selector switch set to high speed heat contacts FCS2 to HI, IT1 to LS, L2 to HTR, and FCS1 to LS are made.
SWITCH | CONTACTS MADE | |
POSITION | ||
| ||
OFF | NONE | |
FAN | L1 TO HI, 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 |
FIGURE 45 — SELECTOR SWITCH CONTACTS, ALL 52CE, PE ELECTRIC HEAT/COOL UNITS
■COOLING ONLY UNITS (Figure 46)
Fan Mode (Low) — With the selector switch set to FAN contact L1 to LO is made.
Fan Mode (High) — With the selector switch set to FAN contact L1 to HI is made.
Cooling (Low) — With the selector switch set to low speed cooling contacts FCS to LO and L1 to IT3 are made.
Cooling (High) — With the selector switch set to high speed cool contacts FCS to HI, L1 to IT3 are made.
SWITCH | CONTACTS MADE | |
POSITION | ||
| ||
OFF | NONE | |
FAN LO | L1 TO LO | |
FAN HI | L1 TO HI | |
LO COOL | L1 TO IT3, FCS TO LO | |
HI COOL | L1 TO IT3, FCS TO HI |
FIGURE 46 — SELECTOR SWITCH CONTACTS,
ALL 52CE, PE COOLING ONLY UNITS
■HEAT PUMP UNITS (Figure 47)
Fan Mode — With the selector switch set to fan contact L1 to HI is made.
Cooling (Low) — With the selector switch set to low cool contacts L1 to IT3 and FCS to LO are made.
Cooling (High) — With the selector switch set to high cool, contacts L1 to IT3 and FCS to HI are made.
Heating (Low) — With the selector switch set to low heat contacts L1 to IT1, FCS to LO and L2 to HTR are made.
Heating (High) — With the selector switch set to high heat 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 acti- vated when the outdoor frost thermostat sensor detects a temperature below 20 F on the coil. At this point, the thermostat deenergizes the compressor and activates the electric heat. The unit will remain in electric heat mode until the outdoor thermostat senses 35 F coil temperature. The defrost mode is a passive operation and may take some time before the coil defrosts.
SWITCH |
| CONTACTS MADE |
POSITION |
| |
|
| |
OFF | NONE | |
FAN | L1 | TO HI |
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 |
FIGURE 47 — SELECTOR SWITCH CONTACT,
ALL 52CQ, PQ HEAT PUMP UNITS
COMPONENT OPERATION AND TROUBLESHOOTING
■TOOLS NEEDED
Flat and Phillips Screw Drivers
Side Cutting Pliers
Before cleaning, servicing, performing maintenance or removing the chassis from the wall sleeve, discon- nect all power to the unit to avoid the possibility of electrical shock and personal injury. Only trained and qualified service personnel should perform installation and service procedures on these units. Untrained personnel may perform basic mainte- nance tasks such as cleaning and replacing filters. Refer to UNIT DISASSEMBLY section of this man- ual for proper procedures to disconnect power to 52C,P units.
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