Conventions Used In This Manual; Start-Up; Unit Preparation; Compressor Mounting - Carrier 48LC 04 Controls, Start-Up, Operation And Troubleshooting

Conventions Used in This Manual

The following conventions for discussing configuration points for
the local display (Scrolling Marquee or Navigator accessory) will
be used in this manual.
Point names will be written with the Mode name first, then any
submodes, then the point name, each separated by an arrow symbol
(). Names will also be shown in bold and italics. As an example,
the Thermostat Control Type which is located in the Configuration
mode, and Unit sub-mode would be written as Configuration
UNITT.CTL.
This path name will show the user how to navigate through the
local display to reach the desired configuration. The user would
scroll through the modes and sub-modes using the up and down
keys. The arrow symbol in the path name represents pressing
ENTER to move into the next level of the menu structure.
When a value is included as part of the path name, it will be shown
at the end of the path name after an equals sign. If the value
represents a configuration setting, an explanation will be shown in
parenthesis after the
ConfigurationUNITT.CTL = 1 (1 Stage Y1).
Pressing the ESCAPE and ENTER keys simultaneously will scroll
an expanded text description of the point name across the display.
The expanded description is shown in the local display tables but
will not be shown with the path names in text.
The CCN point names are also referenced in the local display
tables for users configuring the unit with CCN software instead of
the local display. See Appendix A of this manual.

START-UP

IMPORTANT: Do not attempt to start unit, even momentarily,
until all items on the Start- -Up Checklist (see page 87) and the
following steps have been read/completed.

Unit Preparation

Check that unit has been installed in accordance with these
installation instructions and all applicable codes.

Compressor Mounting

Compressors are internally spring mounted. Do not loosen or
remove compressor holddown bolts.

Refrigerant Service Ports

The refrigerant system has a total of 3 Schrader-type service gauge
ports per circuit. One port is located on the suction line, one on the
compressor discharge line, and one on the liquid line. Be sure that
caps on the ports are tight.

Crankcase Heater

The compressor is equipped with a crankcase heater. There is a
temperature switch used to turn the crankcase heaters on and off
when the compressor is not running. If the ambient is above 75_F
the switch will prevent the crankcase heater from turning on, and if
the ambient is below 60_F the switch will allow the crankcase
heater on.
IMPORTANT: Unit power must be on for 24 hours prior to
start- -up to allow the crankcase heater to run. Otherwise, damage to
the compressor may result.

Compressor Rotation

CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
Improper wiring will cause compressor stoppage and alarm.
Correct wiring by switching leads as indicated below.
value. As an example,
On 3-phase units, it is important to be certain the compressors are
rotating in the proper direction. To determine whether or not
compressors are rotating in the proper direction, use a
phase-rotation meter on the unit input power to check for
L1-L2-L3 or clockwise rotation or use the Service Test mode to
energize a compressor. If the compressor is rotating in the wrong
direction, the controls will stop the compressor and display alarm
for "Circuit A Failure to Pressurize,".
NOTE: Indoor or outdoor fan rotation direction may not indicate
proper input power phase sequence, as some 3-phase units use
single-phase fan motors.
To correct the wrong compressor rotation direction, perform the
following procedure:
1. Turn off power to the unit and lock out the power.
2. Switch any two of the incoming unit power leads.
3. Turn on power to the unit.
4. Verify corrected compressor rotation.

Power Supply

All 208/230-v units are factory wired for 230-v power supply. If
the 208/230-v unit is to be connected to a 208-v power supply, the
transformers (TRAN1, TRAN2 and TRAN3) must be rewired by
moving the wire from the 230-volt connection and moving to the
200-volt terminal on the primary side of the transformer. Refer to
unit label diagram for additional information.

Internal Wiring

Check all electrical connections in unit control boxes; tighten as
required.

Evaporator Fan

The Evaporator fan should be checked and may need to be
adjusted for specific applications. The unit can have a direct drive
Electronic Commutated Motor (ECM) fan system or a belt drive
motor powered by a Variable Frequency Drive (VFD). Refer to the
unit product data for Fan Performance tables and physical data.
On direct drive units, the ECM has 5 speed taps to allow a range of
fan performance. The ComfortlLink control has 3 output wires to
connect to 3 different taps. From the factory the low and high
speed wires are connected to the first and second speed taps,
respectively. The ventilation speed tap is disconnected. The speed
taps increase the speed the higher the tap number, so the first tap is
the lowest speed and tap 5 is the highest speed. If the low and high
speed wires are moved to higher taps, the ventilation speed wire
can be wired into the motor. To activate the use of the ventilation
speed wire, the Number of Speeds (Configurations
NSPD) configuration must be set to 3.

On belt drive units, the fan belt and variable pulleys are factory
installed and set, but may need to be adjusted for specific
applications. Check the fan to ensure its rotation is in the proper
direction before adjusting performance. To alter fan performance,
first adjust the pulley settings to provide the applications full load
design air flow when running at the Supply Fan Maximum Speed
(Configuration UNIT FS.MX). The unit operating speeds can
 
then be adjusted with Supply Fan Speed 1 (Configuration
I.FAN F.SP1), Supply Fan Speed 2 (Configuration
 
F.SP2), Supply Fan Speed 3 (Configuration

and Fan Speed – Ventilation (Configuration
Set the indoor fan pulley to the application design point CFM for
heating and cooling at 100% fan speed so that the CFM is not
lower than the minimum CFM allowed in the product data. If the
exact CFM cannot be set by the half turn pulley settings then adjust
the Supply Fan Maximum Speed (FS.MX) to fine tune the CFM to
the application requirements. The VFD's settings should not be
used for adjusting fan performance. Specific VFD information can
be found in the major components section.
IMPORTANT: The Supply Fan Maximum Speed (FS.MX) RPM
must not produce a supply CFM that is lower than the minimum
CFM allowed in the product data for heating and cooling.
6
I.FAN

I.FAN

I.FAN F.SP3),
 
I.FAN FS.VN).
 