Carrier 50HCQA Installation Manual download pdf (Page 6)

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 value. As an example,

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 103) 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

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 compressor is not

operating.

IMPORTANT: Unit power must be on for 24 hours prior to

start--up. Otherwise, damage to compressor may result.

Compressor Rotation

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.

CAUTION

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 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

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 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 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.

48/50HC04--06 units with direct drive fans

The ECM has 5 speed taps to allow a range of fan performance.

The ComfortLink control has 1 output wires 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.

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, adjust the pulley settings to

provide the applications full load design air flow. Set the indoor

fan pulley to the application design point CFM for heating and

cooling so that the CFM is not lower than the minimum CFM

allowed in the product data.

Belt drive units with a VFD

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 Fan Speed -- Free Cool Lo (Configuration



I.FAN



FS.E1), Fan Speed -- Mech Cooling (Configuration



I.FAN



FS.CL), Fan Speed -- Reheat 2 (Configuration



I.FAN



FS.RH), and Fan Speed – Ventilation (Configuration



I.FAN



FS.VN). 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

ComfortLINK v2.X

1 2 3 4 5 6 7 8 9 10 11 ... 103 104

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Carrier 50HCQA Installation Manual Page 6

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