Carrier 48FK- Manual

Carrier 48FK

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Table of Contents:

  • Page 3 – Table 1 — Pin Terminal Connector J1; In addition to the unit status switch inputs, the processor; Fig. 1 — Processor Board
  • Page 6 – Table 3 — Output Pin and Terminal Assignments
  • Page 10 – Economizer —; Economizer control is used to control; Fig. 13 — Thermistor T3 and T4 Locations,
  • Page 12 – Temperature Reset —; Accessory temperature reset al-; Fig. 15 — Accessory Relay Board; Fig. 17 — Enthalpy Sensor Location
  • Page 18 – Demand Limit —; SPACE TEMPERATURE RESET — 4 SENSOR AVERAGING APPLICATION; SPACE TEMPERATURE RESET — 9 SENSOR AVERAGING APPLICATION; Fig. 26 — Space Temperature Sensor Averaging
  • Page 19 – Fig. 29 — 115-Volt Field Wiring to Accessory
  • Page 21 – Smoke Control Modes; Fig. 30 — Remote SASP Wiring; Fig. 31 — External Alarm Indication
  • Page 22 – Table 5 — Smoke Control Modes; OPERATING SEQUENCE; Table 6 — Smoke Control Switches Required for Each Mode
  • Page 23 – Table 7 — Switch Functions; Air Pressure Tubing —; Table 8 — Tubing Size
  • Page 24 – ALL UNITS; Fig. 32 — Smoke Control Wiring
  • Page 25 – Initial Check; Verify unit has been installed per the Installation Instruc-; Fig. 33 — Modulating Power Exhaust and Inlet
  • Page 26 – Table 9 — Potentiometer Inputs and Ranges; Configuration Header; — The configuration header; Table 10 — Configuration Header and; DIP Switches; — The DIP switches configure the unit
  • Page 27 – Table 12 — DIP Switches; Adjusting Set Points; — Set points for unit operation; Potentiometers; — All of the set point potentiometers
  • Page 28 – Supply Fan Control with IGV Option; — The inlet; Supply Fan Control with VFD Option; — The VFD
  • Page 29 – Fig. 39 — Differential Pressure Switch for Inlet Guide; SPEED CTRL; SETUP; STOP; Fig. 40 — Variable Frequency Drive Keypad
  • Page 30 – Table 13 — VFD Set Point (Frequency Command) for Duct Pressure; — The Modulating Power Exhaust system will main-
  • Page 32 – Table 15 — Quick Test, Unit Configuration and Switch Check
  • Page 34 – Table 18 — Sensor Resistance Values; OPERATING INFORMATION
  • Page 35 – Operating Sequence —
  • Page 36 – Head Pressure Control —
  • Page 42 – Table 19 — Compressor Loading and Unloading Sequences
  • Page 43 – Table 19 — Compressor Loading and Unloading Sequences (cont)
  • Page 44 – Table 21 — Operation Status Codes; Restart Procedure —; Table 20 — Controls Troubleshooting
  • Page 45 – Diagnostic Codes —; Table 22 — Diagnostic Codes
  • Page 48 – Fig. 48 — Processor Board Test Points; Fig. 49 — Relay Board Test Points
  • Page 49 – Table 23 — Voltage Reading; Place the other lead on terminals shown in table below,; nector J1, and mark them for later replacement.
  • Page 51 – Enthalpy Sensor Checkout; Table 28 — Enthalpy Sensor Checkout
  • Page 53 – Table 29 — Carrier Default Program Parameter Values
  • Page 54 – VFD Operation —; VFD Operational Status —; Table 30 — Required User Adjusted Defaults; Unit Wiring —; Fig. 53 — Variable Frequency Drive Terminal Block
  • Page 55 – LEGEND AND NOTES FOR FIG. 55
  • Page 58 – SERVICE TRAINING; ] Packaged Service Training
  • Page 59 – CONTROL SETTINGS
Loading the manual

Controls Operation,

and Troubleshooting

CONTENTS

Page

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . 2

GENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Rooftop Information

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

VAV Control System

. . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Processor Board

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

•

P1 — SUPPLY-AIR SET POINT

•

P2 — ECONOMIZER POSITION

•

P3 — RESET LIMIT

•

P4 — DEMAND LIMIT

•

P5 — ECONOMIZER MINIMUM POSITION

•

P6 — WARM-UP SET POINT

•

P7 — SASP RESET TEMPERATURE

•

PROCESSOR BOARD OUTPUTS

•

CONFIGURATION HEADER AND DIP SWITCH
ASSEMBLY

Relay Board

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Display Board

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Thermistors

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

•

T1 — SUPPLY-AIR TEMPERATURE THERMISTOR

•

T2 — RETURN-AIR TEMPERATURE THERMISTOR

•

T3 — SATURATED CONDENSING TEMPERATURE,
CIRCUIT 1

•

T4 — SATURATED CONDENSING TEMPERATURE,
CIRCUIT 2

•

T10 — RESET TEMPERATURE

Compressor Operation

. . . . . . . . . . . . . . . . . . . . . . . . . 7

•

CONTROL RELAY (CR)

Accessory Board

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

•

P3 — RESET LIMIT

•

P5 — ECONOMIZER MINIMUM POSITION

•

P6 — MORNING WARM-UP TEMPERATURE

Single-Step Demand Unit

. . . . . . . . . . . . . . . . . . . . . . . 7

Demand Limit Control Module (DLCM)

. . . . . . . . . . . . 7

Economizer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

•

ENTHALPY CONTROL

•

DIFFERENTIAL ENTHALPY

Variable Frequency Drive (VFD)

. . . . . . . . . . . . . . . . . 12

Temperature Reset

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

CONTROLS INSTALLATION

. . . . . . . . . . . . . . . . . . . 13-25

Control Wiring

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

•

NIGHT SETBACK THERMOSTAT

•

SPACE TEMPERATURE RESET ACCESSORY
(50DJ900021)

Space Temperature Reset

. . . . . . . . . . . . . . . . . . . . . . 13

•

INSTALLATION

•

CONFIGURATION

•

OPERATING SEQUENCE

Demand Limit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

•

SINGLE-STEP DEMAND LIMIT

•

TWO-STEP DEMAND LIMIT

•

INSTALLATION

•

CONFIGURATION

•

OPERATING SEQUENCE

Control From Remote Building Management

System (BMS)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

•

OCCUPIED/UNOCCUPIED

Page

•

NIGHT SETBACK CONTROL

•

UNIT SUPPLY AIR SET POINT ADJUSTMENT

•

DEMAND UNIT (1-STAGE OR 2-STAGE)

•

SUPPLY DUCT PRESSURE SET POINT ADJUSTMENT

•

EXTERNAL ALARM SIGNAL

•

REMOTE ECONOMIZER CONTROL

Smoke Control Modes

. . . . . . . . . . . . . . . . . . . . . . . . . 21

•

FIRE SHUTDOWN MODE

•

PRESSURIZATION MODE

•

EVACUATION MODE

•

SMOKE PURGE MODE

•

INSTALLATION

•

CONFIGURATION

•

OPERATING SEQUENCE

Air Pressure Tubing

. . . . . . . . . . . . . . . . . . . . . . . . . . . 23

•

INLET GUIDE VANES

•

VARIABLE FREQUENCY DRIVE

•

MODULATING POWER EXHAUST

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-30

Initial Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Configuration Header

. . . . . . . . . . . . . . . . . . . . . . . . . 26

DIP Switches

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Adjusting Set Points

. . . . . . . . . . . . . . . . . . . . . . . . . . 27

Potentiometers

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Supply Fan Control with IGV Option

. . . . . . . . . . . . . 28

Supply Fan Control with VFD Option

. . . . . . . . . . . . 28

Modulating Power Exhaust

(Option or Accessory)

. . . . . . . . . . . . . . . . . . . . . . . 30

START UNIT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-34

Quick Test Program

. . . . . . . . . . . . . . . . . . . . . . . . . . . 31

OPERATING INFORMATION

. . . . . . . . . . . . . . . . . . . 34-43

Digital Display

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

•

CODES 0 THROUGH 8, CAPACITY STEPS

•

CODES 20 THROUGH 30 AND 88, OPERATIONAL
STATUS

•

CODES 51 THROUGH 87, DIAGNOSTIC
INFORMATION

Operating Sequence

. . . . . . . . . . . . . . . . . . . . . . . . . . 35

•

SIZE 034, 038 AND 048-088 UNITS

•

SIZE 044 UNITS

•

SIZE 104 UNITS

Head Pressure Control

. . . . . . . . . . . . . . . . . . . . . . . . 36

Supply Fan Control with IGV

. . . . . . . . . . . . . . . . . . . 38

Supply Fan Control with VFD

. . . . . . . . . . . . . . . . . . . 38

Modulating Power Exhaust (Option or

Accessory Except FY,JY Units)

. . . . . . . . . . . . . . . 38

Unit Staging

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

TROUBLESHOOTING

. . . . . . . . . . . . . . . . . . . . . . . . 44-57

Checking Display Codes

. . . . . . . . . . . . . . . . . . . . . . . 44

Complete Unit Stoppage

. . . . . . . . . . . . . . . . . . . . . . . 44

Single Circuit Stoppage

. . . . . . . . . . . . . . . . . . . . . . . 44

Restart Procedure

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Diagnostic Codes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

•

CODES 51, 52, 55, 56: COMPRESSOR FAILURE

48FK,JK034-074

50FK,FY,JK,JY034-104

Variable-Air Volume Rooftop Units

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1

1

Tab

1a 1b

PC 111

Catalog No. 534-716

Printed in U.S.A.

Form 48/50F,J-1T

Pg 1

4-99

Replaces: 48/50D,F,J-1T

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Summary

Page 3 - Table 1 — Pin Terminal Connector J1; In addition to the unit status switch inputs, the processor; Fig. 1 — Processor Board

Several temperature inputs are connected to the proces- sor. There are either 4 or 5 thermistors (depending on thefield-installed accessories) which input temperature datainto the processor through pin terminal connector J1. SeeTable 1 and Fig. 2. Several status switches are also monitored. These sw...

Page 6 - Table 3 — Output Pin and Terminal Assignments

Table 3 — Output Pin and Terminal Assignments OUTPUT PIN- TERMINAL NAME RATING DEVICE J6-1 Stage 1Compressor Relay (K1)* 24 vac CR1 J6-2 Stage 2Compressor Relay (K2)* U2** J6-3 Stage 3Compressor Relay (K3)* U1 J6-4 Stage 4Compressor Relay (K4)† Not Used J6-5 Stage 5Compressor Relay (K5)† CR2 J6-6 St...

Page 10 - Economizer —; Economizer control is used to control; Fig. 13 — Thermistor T3 and T4 Locations,

Economizer — Economizer control is used to control the outside and return air dampers of the unit, to satisfy spacecooling demand using all outside air (when permitted), andto satisfy cooling in conjunction with compressor operation(when conditions permit). During Occupied periods withoutcooling dem...

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