Carrier 50VT-A installation instructions Defrost Control, Quiet Shift

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50VT-- A

 

 

 

HIGH

 

STD DEHUM

 

 

 

LOW

COM

 

 

 

 

QC5

 

 

 

 

QC4

QC3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KZ

 

 

 

 

KL

QCR

 

 

 

 

 

 

 

 

 

 

 

DCR

 

 

 

 

 

R13

C8

R11

Q1

C

CDM/C

07

09

0L0

08

 

 

ALO

D2

 

 

 

 

 

 

 

 

 

 

 

QC1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q3

AL2

24VAC/R

 

 

 

 

 

 

 

 

 

 

 

 

C9

C4

 

 

 

 

 

 

G1

RL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G2

 

3AMP

QIL

Z2

06

04

 

 

 

 

 

 

 

 

 

A7

R9

AB

A15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C0

F1

 

 

 

 

 

 

 

 

U1

 

Z1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C3

R4

RL4

D5

D3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JWZ

 

P3

 

 

R2

JW5

 

R3

R5

R6

 

 

 

 

 

 

 

 

 

P2

JW3

 

 

 

 

 

QCB

 

 

 

P4

 

 

 

 

 

 

 

 

 

 

SDL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y

 

 

R

W2 Y

 

C

W3 W3 W2 W2 C

 

 

 

 

 

 

 

 

 

 

 

JW4

 

 

 

SSTZ-8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P1

 

 

Y2

 

Y1 C

 

 

 

 

 

 

 

 

W3 W2

G

R

 

 

 

 

 

 

 

 

 

DH

 

Y

 

 

A09059

Fig. 16 - Interface Fan Board (IFB)

ACCUMULATOR

COMPRESSOR

OUTDOOR COIL

INDOOR COIL

TXV in Bypass

Position

LCS

HP S

 

 

 

 

 

 

 

 

Metering

 

LEGEND

Position

 

 

 

HPS – High Pressure Switch

 

 

LCS – Loss of Charge Switch

 

 

 

 

 

 

 

 

Accurater®Metering De vice

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arrow indicates direction of flow

C03012

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 17 - Typical Heat Pump Operation, Heating Mode

Step 3 — Defrost Control

If defrost thermostat is closed, speed-up pins (J1) must be shorted

Quiet Shift

by placing a flat head screw driver in between for 5 sec and

releasing, to observe a complete defrost cycle. When the Quiet

Quiet Shift is a field-selectable defrost mode, which will eliminate

Shift switch is selected, compressor will be turned off for two 30

occasional noise that could be heard at the start of defrost cycle and

sec intervals during this complete defrost cycle, as explained

restarting of heating cycle. It is selected by placing DIP switch 3

previously. When Quiet Shift switch is in factory default OFF

(on defrost board) in ON position.

position, a normal and complete defrost cycle will be observed.

When Quiet Shift switch is placed in ON position, and a defrost is

If defrost thermostat is in open position, and speedup pins are

initiated, the following sequence of operation will occur. Reversing

shorted (with a flat head screw driver) for 5 sec and released, a

valve will energize, outdoor fan will turn off, compressor will turn

short defrost cycle will be observed (actual length is dependent

off for 30 sec and then turn back on to complete defrost. At the

upon the selected Quiet Shift position). When Quiet Shift switch is

start of heating after conclusion of defrost reversing valve will

in ON position, the length of defrost is 1 minute (30 sec

de-energize, compressor will turn off for another 30 sec, and the

compressor off period followed by 30 sec of defrost with

outdoor fan will stay off for 40 sec, before starting in the Heating

compressor operation). On return to heating operation, compressor

mode.

will again turn off for an additional 30 sec and the outdoor fan for

Defrost

40 sec. When the Quiet Shift is in OFF position, only a brief 30

The defrost control is a time/temperature control which includes a

sec. cycle will be observed.

NOTE: Unit will remain in defrost until defrost thermostat

field-selectable time period (DIP switch 1 and 2 on the board)

between defrost cycles of 30, 60, 90, or 120 minutes (factory set at

reopens at approximately 65_F (18_C) coil temperature at liquid

60 minutes). To initiate a forced defrost, two options are available

line or remainder of defrost cycle time.

depending on the status of the defrost thermostat.

 

 

 

 

 

 

 

 

 

20

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Contents Table of Contents Safety ConsiderationsReceiving and Installation IntroductionCheck Equipment Provide Unit Support50VT-A24-30 Unit Dimensions 50VT-A36-60 Unit Dimensions Large Curb Rig and Place Unit InspectionRigging/Lifting of Unit See Fig Unit Falling HazardSelect and Install Ductwork Personal Injury HazardInstall Electrical Connections Provide for Condensate DisposalHigh-Voltage Connections Unit Component Damage HazardSpecial Procedures for 208-V Operation Accessory Electric Heaters InstallationStandard Connections Control Voltage ConnectionsPhysical Data Unit 50VT-A Minimum Airflow for Reliable Electric Heater Operation CFMConnection Wiring Schematics 208/230-1-60 Cont. Ladder Wiring Schematics 208/230-1-60 50VT a Cont. Ladder Wiring Schematics 208/230-3-60 Connection Wiring Diagram Cont. Ladder Wiring Diagram Start-Up Adjustments START-UPCheck for Refrigerant Leaks Checking Cooling and Heating Control OperationChecking and Adjusting Refrigerant Charge Indoor Airflow and Airflow AdjustmentsTwo Cooling Fan Speeds Set-up Dehumidification feature used Unit Operation HazardColor Coding for Indoor Fan Motor Leads Single Speed Cooling With Higher Electric Heat SpeedContinuous Fan Operation Defrost Defrost ControlQuiet Shift Dry Coil Air Delivery Downflow Discharge Horizontal and Downflow Filter Pressure Drop Table IN. W.CElectric Heat Pressure Drop Table in. W.C Small Cabinet Electric Heat Pressure Drop Table in. W.C Large CabinetMaintenance Air FilterIndoor Blower and Motor Personal Injury and Unit Damage HazardCooling Charging Table-Subcooling OF2 Electrical Controls and Wiring Outdoor Coil, Indoor Coil, and Condensate Drain PanOutdoor Fan Refrigerant CircuitPressure Switches Loss of Charge SwitchHigh-Pressure Switch Copeland Scroll Compressor Puron RefrigerantSystem Information TroubleshootingSTART-UP Checklist Puronr R-410A Quick Reference Guide Troubleshooting Chart Symptom Cause RemedyTemperatures Remove and Store in Job FilesPreliminary Information Model no III. START-UP Electrical Supply Voltage Compressor AmpsCatalog No 50VT---09SI
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50VT-A specifications

Carrier’s 50VT-A and 50EZ-A series exemplify cutting-edge advancements in heating, ventilation, and air conditioning (HVAC) technology. These products are engineered to meet diverse climate control needs in residential and commercial applications while ensuring operational efficiency and superior indoor air quality.

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