Product data

OPERATING SEQUENCE — HIGH WALL FAN COIL SYSTEMS (cont)
SYSTEM SAFETIES — The system is equipped with the follow-
ing safety devices to protect system components:
1. Condensate float switch (619C units equipped with acces-
sory condensate pump, cooling cycle only) — If the level of
condensate in the drain pan rises too high, the condensate
float switch will turn off the compressor and outdoor fan until
the condensate level returns to normal. The indoor fan will
continue to run.
2. Outdoor Unit Safeties — These units are protected by the
following devices:
• high-pressure switch
• low-pressure switch (condensing units only)
• compressor internal overloads
• outdoor-fan motor internal overload
NOTE: Outdoor units with scroll compressors are also pro-
tected by a high discharge gas temperature sensor and a
2-minute timer to prevent possible reverse rotation of the
compressor.
Should any of these devices trip after the compressor is ener-
gized, the Cycle-LOC™ protection device will lock out the out-
door unit (turn it off) to prevent cycling on a safety device.
THERMOSTATS — The included thermostats are primarily for
cooling applications, but can be used when both cooling and
heating set points are required. When set in AUTO mode the
space conditions are maintained by calling for either cooling or
heating and maintaining at least a 2 degree differential between
them. Indoor fan will operate in all instances either in auto mode
or in a pre-selected manual mode. Automatic mode operation is
as follows:
Auto Cooling mode: Y contact will be closed.
H1 contact open.
Auto Heating mode: Y contact open
H1 contact will be closed.
Other thermostat operating features include the following:
• Center (orange) LED is for AUX heat.
• Right-hand (red) LED indicates a fault — compressor lock-out
when wired.
• Filter indicator on display screen becomes activated at
250 hrs of run time. To reset, hold fan button in for 5 seconds.
• Terminal block RSI, RS2, RS+V can be used for a remote in-
door sensor so that the thermostat can be located elsewhere
(secure room).
OPERATING MODE MEMORY — After the system is turned off
or after a power failure, the system remains in the last operating
mode selected. When the system is turned back on, or when
power is automatically restored, operation continues in the
same operating mode as when the system shut down.
AUTOMATIC AIR SWEEP (Ceiling Suspended Systems
Only) — All units are equipped with an automatic air sweep fea-
ture which automatically directs the airflow louvers up and down
to provide optimum room air circulation. If the auto sweep fea-
ture is not desired, temporarily start the auto sweep using the
remote thermostat (press Air Sweep button). When the louvers
are in the desired position, turn auto sweep off (press Air Sweep
button again) to hold them in that position.
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