Installation guide

ManualsBrandsCarrier ManualsCentral air conditionerOfficial Carrier package unit

Installation Instructions

NOTE: Read and become familiar with these instructions before

beginning installation.

SAFETY CONSIDERATIONS

Installing and servicing air-conditioning equipment can be

hazardous due to system pressures and electrical components.

Only trained and qualified personnel should install or service

air-conditioning equipment. When working on air-conditioning

equipment, observe the precautions provided in literature, tags,

and labels attached to the unit.

Follow all safety codes. Wear safety glasses, protective clothing,

and work gloves. Use quenching cloth for brazing operations.

Have fire extinguisher available. Read these instructions

thoroughly and follow all warnings or cautions included in

literature and attached to the unit. Consult local building codes

and National Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety-alert symbol i_x.

When you see this symbol on the unit and in instructions or

manuals, be alert to the potential for personal injury.

Understand these signal words: DANGER. WARNING, and

CAUTION. These words are used with the safety-alert symbol.

DANGER identifies the most serious hazards which will result in

severe personal injury or death. WARNING signifies hazards

which could result in personal injury or death. CAUTION is used

to identify unsafe practices which may result in minor personal

injury or product and property damage. NOTE is used to

highlight suggestions which will result in enhanced installation,

reliability, or operation.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Before beginning any modification or installation of this kit,

be sure the main electrical disconnect is in the OFF position.

Ensure power is disconnected to the fan coil unit. On some

systems both the fan coil and the outdoor unit may be on the

same disconnect. Tag the disconnect switch with a suitable

warning label. There may be more than one disconnect.

GENERAL

IMPORTANT: Heat pump models require an isolation relay to

prevent fan cycling in heat pump mode. See Table 1 for isolation

relay part numbers.

Table 1--Isolation Relay Part Numbers

38BNQO09/012 HN61KK912 P283-0294 120v

38BCQ018/024 HN61 KK912 P283-0294 120v

38BNQ018/038 HN61 KK913 P283-0295 240v

38QRR/QRF HN61 KK068 P283-0293 24v

538B R/538Q R HN61KK068 P283-0293 24v

Wind baffles are re( uired for all R410a units (18-60k are blow

through design) used for low ambient operation. Wind baffles are

not available from the factory for R-22 condensers (draw through

design). If required, the}, will need to be field fabricated.

Winter Start Control (part number KAAWS0101AAA) is

recommended when low ambient conditions exist (cooling only

018-060 units). The Winter Start Control kit uses a time-delay

relay to bypass the low-pressure switch for three (3) minutes on

start-up, the time delay relay will take the low pressure switch

out of the control circuit to allow the system to build pressure

eliminating nuisance trips. _h_its with low pressure switches:

38HDR/HDF/QRR/QRF and 538E_F/538Q_F.

Crankcase Heater is required for low ambient operation.

NOTE: Some condensers have a Crankcase Heater as standard.

check unit Installation and Service Instructions.

These instructions cover the installation of low ambient

temperature controller accessory kit on the duct-free cooling and

heat pump condensing units.

The low ambient temperature head pressure controller (HPC) is a

fan control device activated by a high cycle rate pressure switch.

It is specifically designed for use with duct-free systems, cooling

only and heat pump units.

The low ambient temperature controller is designed to maintain a

condensing pressure of 200 to 225 psig for BNC/BNQ models

and 321 to 362 psig for HDF/HDR and QRF/QRR models by

cycling the outdoor-fan motor. No field adjustments or

calibrations are required.

All of the components necessary for installing the low ambient

temperature controller are included in the package. This kit

consists of a pressure switch and installation instructions. When

unpacking the accessory, carefully inspect for shipping damage.

If damage is evident, return for replacement.

Summary of content (4 pages)

PAGE 1
Installation NOTE: Read and become beginning familiar with these instructions before installation. CONSIDERATIONS prevent Installing and servicing air-conditioning equipment can be hazardous due to system pressures and electrical components. Only trained and qualified personnel should install or service air-conditioning equipment. When equipment, observe the precautions and labels attached to the unit. all safety codes.
PAGE 2
INSTALLATION STEP 1 --Mount Pressure Switch STEP 1. Place 3 drops of compressor oil in the pressure switch for lubrication. Use oil appropriate for R-22 or R-410a depending 2. Mount 2 --Connect All wiring ('ode Power must comply (NEC) requirements. Wiring with local codes and National See Fig. 3-5 for accessory on system. the pressure 3. ('oil up the excess switch. switch as shown wire and secure in Fig. 1-2. next to the pressure L0_ A_i_m _0m_C_ER- D06005 Fig.
PAGE 3
COOLING ONLY MODELS Model No. 38BNC009-036 38HDF018-036 White Black Wire Color 38HDR018-060 538A Series Black Black 538B Series Black SEE CHART LAC _,_}_ _ FOR COLOR + 8LU 8LU TO TERMINAL CONNECT]ON + _ MAINPOWER FAN MOTOR LEGEND LAC = Low Ambient (Temperature) Control D06002 Fig. 3 - Low Ambient Temperature Cooling Only Control Wiling Models HEAT PUMP MODELS (Reversing Valve Energized Model No.
PAGE 4
CHECK OPERATION Before starting the system to check operation of low ambient temperature controller, ensure that the power wiring and location of controller assembly are correct. To check operation of low The ambient 38QRR-018-060 models (-+ 10 psig). When the set point is reached, the outdoor fan will cycle to maintain the set point condensing pressure. temperature controller: 1. Turn power on to system. 2. Set thermostat below room 3. Ensure that there the microprocessor 4. Check temperature.