10
DRAIN CONNECTIONS
Install drains to meet the local sanitation codes. If adequate gravity
drainage cannot be provided, a field installed condensate pump
accessory should be used. The pump has a lift capability of 12 ft
(3.6 m) on the discharge side if the pump is mounted in the fan coil
or 6 ft (1.8 m) on the suction side if the pump is remote mounted.
See the Physical Data tables for drain sizes.
NOTE
: The high wall fan coils have internal condensate trap. An
external trap is not required.
Drain connections may be routed through alternate locations as
shown in Fig. 11.
Pipe holder
Pipe cover
Right piping
Left piping
Pipe cover
Right back piping
Left back piping
1
2
3
4
A09112
Fig. 11 – Piping Locations
WIRING
The main power is supplied to the outdoor unit. The field supplied
connecting cable from the outdoor unit to the indoor consists of 4
wires and provides the power for the indoor unit as well the
communication signal and ground between the outdoor unit and
indoor unit.
CONTROL SYSTEM
The 40GXQ/38GXQ unit is equipped with a microprocessor
controls to operate the system and give optimum levels of comfort
and operating efficiency.
There are microprocessor boards and thermistors located in both
the indoor and outdoor units. The thermistors monitor the system
operation and control the operating mode. The change in the
settings or the modes of operation, use the factory supplied
wireless remote control.
The 40GXQ/38GXQ unit has 5 operating modes:
S
Fan Only
S
Auto
S
Heating
S
Cooling
S
Dehumidification (Dry)
FAN ONLY
-- In Fan Only mode, the system filters and circulates
the room air without changing the room air temperature.
AUTO
-- In Auto mode, the system will automatically select one of
the following operating modes: cooling, heating or fan only based
on the difference between the room temperature and the set point
temperature.
HEATING
-- In the Heating mode, the system heats and filters
room air.
COOLING
-- When in Cooling mode, the fan runs all the time and
the system cools, dries and filters room air.
DEHUMIDIFICATION (DRY)
-- in Dehumidification (Dry)
mode, the system dries, filters and slightly cools room temperature.
This mode does not take place of a dehumidifier.
In addition to the above modes that are selected by using the
remote control, the unit can run in emergency mode by using a
manual button. This mode is used when the remote is misplaced or
the batteries in the remote died. In this mode the unit will run in
AUTO mode with a predetermined set point (76
_
F/24.4
_
C)
For more details on the sequence of operation please refer to the
service manual for those units.
WIRELESS REMOTE CONTROL
1. A wireless remote control is supplied for system operation.
2. Each battery--operated wireless remote control may be used
to control more than one unit.
3. The wireless remote control has a range of 25 ft. (7.6 m).
START--UP SEQUENCE
In both cooling and heating mode, the compressor does a soft start
from 0 Hz run speed approximately 52 Hz run speed. The event
takes about 55 seconds. This eliminates high in rush currents
associated with fixed speed compressors and also reduces the stress
on internal compressor parts typically seen with a full speed
startup.
COOLING MODE
In Cooling mode, the first step in compressor speed after the soft
start is a run speed of approximately 52 Hz for 150 seconds. The
next step is a ramp up to approximately 78 Hz.
If, within 20 minutes, the load is satisfied at 78 Hz, the compressor
will start to ramp back down in speed in an effort to track the load.
If the load is not satisfied within 20 minutes, the compressor speed
will ramp up to approximately 85 Hz. The compressor will operate
at this speed until the load is satisfied or a maximum of 20 minutes
after which the compressor will shut off for 3 minutes.
After 3 minutes the cycle repeats itself until the load is satisfied.
HEATING MODE
In Heating mode, the first step in compressor speed after the soft
start is a run speed of approximately 52 Hz for 150 seconds. The
next step is a ramp up to approximately 72 Hz.
If, within 25 minutes, the load is satisfied at 72 Hz, the compressor
will start to ramp back down in speed in an effort to track the load.
If the load is not satisfied within 25 minutes, the compressor speed
will ramp up to approximately 82 Hz.
The compressor will operate at this speed until the load is satisfied
or a maximum of 18 minutes after which the compressor will shut
off for 3 minutes.
After 3 minutes the cycle repeats itself until the load is satisfied.
38/
40GX
Q
