Pre-Start-Up; Pre-Start Checks; Start-Up; Operation - Carrier 40UV Installation, Start-Up And Service Instructions Manual

PRE-START-UP

NOTE: Refer to start-up sheets.
IMPORTANT: Start-up and adjustment procedures should
be performed by a qualified service agency. No water-flow
can cause a freeze condition resulting in damage to the coil.
Never leave the unit filled with water in a building without
heat unless antifreeze has been added.

Pre-start Checks

1. Check that the supply voltage matches the unit supply voltage
listed on the Unit Serial Plate. Verify that all wiring is secure
and properly protected. Trace circuits to ensure that the unit
has been wired according to the wiring diagram.
2. Check that the unit has no visible damage and that all the
components are secure.
3. Check that all field electrical and mechanical work has been
performed according to all applicable Federal, State, and
Local codes.
4. Check the supply voltage to the unit is within ± 5% of the
voltage on the unit serial plate.
5. Check that the system has been correctly flushed.
6. Check for any water leaks.
The unit and interconnecting piping have been evacuated correctly
and the condensing unit service valves are open (DX Cooling
units only).
7. Check that the plug is installed for the condensate connection
that is not being used.
8. Check that the motor is secure and the shaft and blower set
screws are tight. Rotate the blower shaft by hand.
9. Check that the filters have been properly installed.

START-UP

NOTE: For models with DX Cooling, see the installation and
maintenance manual provided with the condensing unit for
start-up information.
DX Cooling models only:
1. Ensure that the condensing unit start-up procedure (DX
Cooling models only) has been carried out, as detailed in the
condensing unit installation and maintenance manual.
2. The compressor should be isolated by removing the connec-
tion at the Y1 terminal on the indoor unit. Main power can
now be applied to the indoor and outdoor units. A system
electrical check can now be carried out.
All models:
3. Switch the 3-speed switch to position 1, 2 or 3.
4. Switch the disconnect switch to the "ON" position.
5. Confirm that the blower motor is rotating in the correct direc-
tion and blowing air out of the supply air grill.
a. (Units with Chilled Water, Hot Water and Steam Coils
only) Ensure all valves are open to the unit.
b. (Units with Chilled Water and Hot Water only) Check
water flow rates and pressure drops and compare to
design.
6. Check that the dampers are not obstructed and move through
their full range of motion.
During the unit operation, measure and record all the information
that is required to complete the Start-Up Sheets that are supplied
with the unit. Copy the information onto the Start-Up Sheets in
this manual for your records.
DX Cooling models only:
Shut unit down and disconnect the main power. The compressor
signal Y1 (disconnected from the indoor unit in Step 2) can now
be re-connected and main power applied to the system.
NOTE: The 24V power for the indoor unit control circuit is sup-
plied from a unit factory-installed transformer. When the indoor
and outdoor units are supplied from separate main supplies, care
must be taken to ensure that the outdoor unit is isolated whenever
the indoor unit power is removed. Failure to do so may result in
freeze ups and other damage to the unit.
The supply fan shall run at all times when unit is in occupied
mode. When in unoccupied mode, the supply fan shall run only
on a call for heating or cooling. The supply fan speed can be
adjusted using the standard equipped manual 3-speed switch.

Freeze Stat (Optional)

On units equipped, an adjustable auto-resetting freeze stat is fac-
tory set to trip at 35°F. If the coil temperature reaches the limit and
the freeze stat trips, it shall automatically reset when the coil tem-
perature rises 5°F above the setpoint. The freeze stat shall be
wired so that upon tripping, power is removed from the supply
fan, the outside air damper closes, and either the HW (Hot Water)
valve opens or the face and bypass damper goes to full bypass.

Outside Air and Return Air Dampers (Optional)

The outside air and return air dampers control the mixture of re-
turn air and outside air drawn through the unit. Both dampers are
linked together and are controlled by an actuator requiring a
2-6VDC proportional signal. At 2V, the dampers are positioned
for full return air and no outside air. At 6V, the dampers are posi-
tioned for full outside air and no return air. The outside air damper
shall open to a minimum position to provide ventilation require-
ments when the room is occupied. When in heating mode, if the
space temperature is more than 4°F from the heating setpoint, the
outside air damper shall fully close. The outside air damper shall
also be fully closed during unoccupied mode. NOTE: Sequence of
operations are a factory recommendation.
The dampers can act as economizers for free-cooling. If cooling is
required and the outside air temperature is below the economizer
outside air lockout temperature (60°F recommended) and above
35°F (adjustable), the outside air damper shall modulate open.
NOTE: Sequence of operations is a factory recommendation.

Chilled Water with Valve Control

Units with a chilled water coil and 24v controls by others desiring
valve control shall use a non-spring return modulating valve oper-
ated by either a proportional (2-10VDC) or a tri-state (24VAC)
signal.

Chilled Water with Face and Bypass Control

Units equipped with a chilled water coil and face and bypass con-
trol shall modulate the face and bypass damper via a spring return
actuator, controlled by a proportional signal (2-5.5V). The face
and bypass damper regulates the amount of return air and outside
air passing through the chilled water coil. On a call for cooling, the
damper shall open to the face of the coil proportionally based on
how many degrees the room temperature is from the setpoint.
18

OPERATION

CONTROLS