18
SECTION 3: START-UP & OPERATION
SEQUENCE OF OPERATION
When power is turned on and thermostat fan switch is
set to ON and the cooling indicator is set to OFF, the
indoor fan motor is energized in approximately 2 min-
utes. The outdoor unit is off.
When power is turned on and thermostat fan switch is
set to ON or AUTO and the cooling indicator to COOL
the indoor and outdoor units will start.
AUTO position on the thermostat will stop and start your
system when the temperature setting is satisfied. The
ON position on the thermostat will stop the outdoor unit
only when the temperature setting is satisfied and the
indoor unit will continue to run, recirculating indoor air.
The fan coil unit is equipped with a protective device
called an anti-frost control which will automatically stop
the outdoor unit (while the indoor unit continues to run) if
ice accumulates on the indoor unit evaporator coil
causing abnormal operating conditions. When the
accumulated ice has melted, the anti-frost control will
restart the outdoor unit.
The fan coil unit is equipped with primary float switch, and the
system will automatically shut down if the drain pan is full of water
(condensate) and not draining. The system requires service.
PRIOR TO START-UP
1. Check all electrical connections for tightness.
2. Check air filter has been installed in return air box or
filter box.
3. Remove all winter supply shut-offs and store them in a
safe place.
SYSTEM START-UP & ADJUSTMENTS
1. Place thermostat fan switch in ON position and cooling
indicator in OFF position. In about 2 minutes, indoor
unit blower will start.
2. Check blower operation for excess noise or vibration.
3. Check entire distribution system for leakage and apply
additional tape where necessary.
4. Measure/adjust blower voltage/speeds
a. Remove the control box cover located on the side
of the unit.
b. With the unit powered and operating from a
conventional thermostat, ensure there is no conditioning
call (Thermostat is satisfied) and switch the fan
control to “Manual” or “On” to create a G call.
NOTE: IF NO AIRFLOW DURING W OR Y CALL,
POTENTIOMETER MAY BE IN “OFF” POSITION.
TURN CW TO ACHIEVE AIRFLOW
c. Place the ground/neutral probe in the lower right hole
marked “COM” and the volt probe in the hole marked
“Flo0” (for fan only, G call) and measure DC volts between
0 and 5V. Adjust the potentiometer adjacent to the “Flo0”
to achieve the desired volt reading. Repeat for remaining
adjustments marked Flo1 through Flo4 as indicated on
the label inside the cover. (Refer to Figure 3)
d. To determine unit airflow, in CFM, measure the voltage
corresponding to the current conditioning call, and
measure the external static pressure in the plenum, at
least 18” from the unit or nearest transition point. Locate
the static pressure on the left side of the charts (Figure
3.2/3.3/3.4) and read across until you reach the curve
corresponding to the measured voltage. From the point
where this crosses, drop a line straight down to read the
airflow at the bottom of the chart. For system settings of
1.2" inch static pressure, refer to tables in Figures 3.21,
3.31 and 3.41.
e. To adjust airflow, locate the nearest system curve, and
follow parallel to this curve while adjusting the signal
voltage to achieve the desired airflow. If the static pressure
falls above or below the desired operating range for the
given airflow, then the air delivery system must be
adjusted. To lower static pressure, provide additional
outlets to the system, to raise the static pressure, install
restrictor orifices as described in the Installation and
Operations Manual.
f. Replace the speed control cover.
Flo0
Fan Only
Flo1
Cooling
Flo2
Heating
Flo3
Stage 2
Cooling
Flo4
Stage 2
Heating
FIGURE 3: SPEED CONTROL PANEL
4
3
2
1
0
Содержание WCSP-2430JV
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