17
Table 7—Cooling Charging Chart
SUCTION LINE TEMPERATURE (°F)
Suction Line Pressure (PSIG)
OD Temp.
(°F)
52 54 56 59 61 64 67 70 73 76 79 82 85 89 92
45 51 55 60 64 69 — — — — — — — — — —
55 — — 53 57 62 66 70 — — — — — — — —
65 — — — — 53 57 62 66 71 75 — — — — —
75 — — — — — — — 56 61 66 71 76 — — —
85 — — — — — — — — 53 58 63 67 72 — —
95 — — — — — — — — — 50 54 58 62 66 —
105 — — — — — — — — — — 50 53 57 60 64
115 — — — — — — — — — — 49 52 55 58 61
125 — — — — — — — — — — — 50 53 56 59
SUCTION LINE TEMPERATURE (°C)
Suction Line Pressure (kPa)
OD Temp.
(°C)
361 370 387 405 423 442 462 482 502 523 544 566 589 612 636
7 11 13 15 18 21 — — — — — — — — — —
13 — — 12 14 16 19 21 — — — — — — — —
18 — — — — 12 14 17 19 21 24 — — — — —
24 — — — — — — — 13 16 19 22 24 — — —
29 — — — — — — — — 12 14 17 20 22 — —
35 — — — — — — — — — 10 12 14 17 19 —
41 — — — — — — — — — — 10 12 14 16 18
46 — — — — — — — — — — 9 11 13 14 16
52 — — — — — — — — — — — 10 11 13 15
COOLING OPERATION (SIZES 048 AND 060)
These units utilize a 2 stage indoor thermostat. With a first stage call
for cooling (Y1), the indoor fan (low stage) energizes immediately
whereas the contactor energizes after a 5 minute time delay (in case
of an initial start--up) starting the compressor (low stage) and the
outdoor fan motor. If the low stage operation cannot satisfy the
cooling demand, the second stage cooling (Y2) energizesswitching
the compressor into high stage cooling through energizing an
internal solenoid valve inside the scroll compressor and switching
the indoor fan into high stage. When second stage cooling is
satisfied, Y2 de--energizes switching the compressorand the indoor
fan into low stage cooling. When the low stage cooling demand is
met, Y1 de--energizes shutting the compressor, indoor fan and the
outdoor fan.
HEATING OPERATION (SIZES 024-- 042)
With a call for heating (Y1), the indoor fan (low stage) energizes
immediately whereas the contactor energizes after a 5 minute time
delay (in case of initial start--up) starting the compressor and the
outdoor fan motor. If Y/Y2 cannot satisfy the heating demand, the
auxiliary or backup heat (W2) energizes. In case of staged heating,
W3 is energized if the demand is not met. The highest airflow
selected is run while the electric heat is in operation. When heating
demand is met, W3, W2 and Y/Y2 sequentially de-- energize
shutting the compressor, indoor fan and the outdoor fan.
HEATING OPERATION (SIZES 048 AND 060)
With a first stage call for heating (Y1), the indoor fan (low stage)
energizes immediately whereas the contactor energizes after a 5
minute time delay (in case of initial start--up) starting the compressor
(low stage) and the outdoor fan motor. If the low stage oepration
cannot satisfy the heating demand, the second stage heating (Y2)
energizes switching the compressor into high stage heating through
energizing an internal solenoid valve inside the scroll compressor
and switching the indoor fan into high stage. The auxiliary or
backup heat is controlled by a third stage (W2). If the demand is not
met, W3 is energized in case of staged heating. When heating
demand is satisfied, W3, W2 and Y2 sequentially de--energize
switching the compressor and the indoor fan into low stage heating.
When the low stage heating demand is met, Y1 de--energizes
shutting the compressor, indoor fan and the outdoor fan.
CONTINUOUS FAN
With the continuous Indoor fan option selected on the thermostat,
G is continuously energized. In case of 024--042 units, the selected
airflow setting is provided. In case of 048 and 060 units, the system
runs low stage (Y1) airflow for continuous fan operation.
DEFROST
Defrost board (DB) is a time and temperature control, which
includes a field--selectable time period between checks for defrost
(30, 60, 90 and 120 minutes). The time period is factory --set at 60
minutes and should only be adjusted by a trained service person.
Electronic timer and defrost cycle start only when contactor is
energized and defrost thermostat (DFT) is closed.
Defrost mode is identical to Cooling mode. The outdoor fan motor
stops because of “OF1” and “OF2” contacts opening on the defrost
board,abank ofoptionalelectricheat turnson to warm airsupplying
the conditioned space.
ELECTRIC RESISTANCE HEATING
If accessory electric heaters are installed, on a call for “Emergency
Heat” the thermostat energizes W which ener gizes the heater relay
and in turn energizes the electric heaters. The IFR is energized
which starts the indoor--fan motor. If the heaters are staged, W2 is
energized when the second stage of heating is required. When the
need for heating is satisfied, the heater and IFM are de--energized.
MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This cooling unit should be
inspected at least once each year by a qualified service person. T o
troubleshoot unit, refer to Troubleshooting Chart in back of book.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
50ZPA
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