Conventions Used In This Manual; Start-Up; Unit Preparation; Compressor Mounting - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

This requires that any previous table database be completely
removed first. Failure to do this will not allow the user to dis-
play the new points that have been created and the CCN inter-
face will have a different table database than the unit control.

Conventions Used in This Manual

The following conventions for discussing configuration points
for the local display (scrolling marquee or Navigator accesso-
ry) 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
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 value. As an example, Configu-
 
ration 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 momentar-
ily, until all items on the Start-Up Checklist (see CL-1) and
the following steps have been read/completed.

Unit Preparation

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

Compressor Mounting

Compressors are internally spring mounted. Do not loosen or
remove compressor hold-down bolts.

Refrigerant Service Ports

Each independent 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(s)

Compressor crankcase heater operation varies depending on
the unit size and type. In general for all units, the crankcase
heaters are energized if there is power to the unit and the com-
pressor is not operating.
IMPORTANT: Unit power must be on for 24 hours prior to
start-up. Otherwise, damage to compressor may result.
T.CTL.

Compressor Rotation

EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
unit.
DO not bypass the VFD while running the motor. Do not
change VFD parameter associated with motor characteris-
tics, these are factory programmed for motor protection.
Damage to the motor or the VFD can occur.
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 be-
low.
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 dis-
play alarm for "Circuit x Failure to Pressurize" where x is the
corresponding A or B compressor circuit.
NOTE: Indoor or outdoor fan rotation direction may not indicate
proper input power phase sequence, as some 3-phase units use sin-
gle-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 sup-
ply, the transformers 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 dia-
gram for additional information.

Internal Wiring

Check all electrical connections in unit control boxes; tighten
as required. See Fig. 4 and 5 for panel and filter locations.

Evaporator Fan

The evaporator fan should be checked and may need to be ad-
justed for specific applications. The 48/50HC04-06 size units
can have a direct drive Electronic Commutated Motor (ECM)
fan system; all other units have a belt drive motor. The belt
drive motor can also be powered from an optional Variable
Frequency Drive (VFD). Refer to the unit product data for Fan
Performance tables and physical data.

48/50HC 04-06 UNITS WITH DIRECT DRIVE FANS

The ECM has 5 speed taps to allow a range of fan perfor-
mance. The ComfortLink control has 1 output wire to connect
to 1 tap. From the factory the control wire is connected to the
first tap. 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.
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CAUTION
CAUTION