Carrier 48FK- Manuals

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...

Page 12 - Temperature Reset —; Accessory temperature reset al-; Fig. 15 — Accessory Relay Board; Fig. 17 — Enthalpy Sensor Location

Variable Frequency Drive (VFD) — The optional VFD is used to modulate supply fan airflow to maintain ductstatic pressure on VAV applications. The VFD is located inthe supply fan section (see Fig. 18 and 19), and can be ac-cessed by opening the fan section access door. The unit is supplied with a pre...

Page 18 - Demand Limit —; SPACE TEMPERATURE RESET — 4 SENSOR AVERAGING APPLICATION; SPACE TEMPERATURE RESET — 9 SENSOR AVERAGING APPLICATION; Fig. 26 — Space Temperature Sensor Averaging

Demand Limit — The demand limit function provides a means to limit the cooling capacity of the VAV unit usingan external discrete switch function. When enabled by theclosure of the external switch, the control will limit the avail-able compressor staging capacity according to user set pointsestablis...

Page 19 - Fig. 29 — 115-Volt Field Wiring to Accessory

Connect the potentiometer end terminals to terminals 8 and 9 on control terminal block TB3 (sizes 034-048) or TB4(sizes 054-104) (see Fig 27). Connect the switch terminalsto the potentiometer wiper arm terminal and to terminal 10on TB3 or TB4. To enable demand limit function, change DIP switch 5 to ...

Page 21 - Smoke Control Modes; Fig. 30 — Remote SASP Wiring; Fig. 31 — External Alarm Indication

EXTERNAL ALARM SIGNAL — The unit controls pro-vide an external alarm status signal via a 115-vac output sig-nal at the relay board J5, available at TB2-4 and TB2-5(common). This signal can be forwarded to the BMS by add-ing a signal relay at the alarm output, placing its coil acrossterminals TB2-4 a...

Page 22 - Table 5 — Smoke Control Modes; OPERATING SEQUENCE; Table 6 — Smoke Control Switches Required for Each Mode

INSTALLATION — To enable one or more of the possiblesmoke control modes available with these units, determinethe switches required for the desired mode(s) from Table 6,field-supply and install the appropriate switches and field wireper Fig. 32. Switch functions are shown in Table 7. Table 5 — Smoke ...

Page 23 - Table 7 — Switch Functions; Air Pressure Tubing —; Table 8 — Tubing Size

Table 7 — Switch Functions SWITCH NUMBER CONFIGURATION VOLTAGE FUNCTION SW-1 N.C. 115 Deenergize 115-v (OFC, Comp, IFC, Electric Heaters) SW-2 N.C. 115 Deenergize TRAN7 (Process Board) SW-3 N.O. 24 Energize EOR (Open Economizer Outside Air Dampers) SW-4 N.O. 115 Energize IFC and CR-3 (IGV/VFD) SW-5 ...

Page 24 - ALL UNITS; Fig. 32 — Smoke Control Wiring

VIO NC NO C WHT REMOVEDFROM C-DPS SW-8 SW-7 ALL UNITS DPS GRA REMOVE JUMPER 034-048 UNITS 5 6 TB2 TB2 SW-1 1 2 TB2 TB2 SW-2 REMOVE JUMPER 8 9 TB2 TB2 SW-5 REMOVE JUMPER TB3 SW-3 TB3 1 5 TB2 TB2 5 9 SW-4 TB2 SW-6 TB2 5 8 TB3 TB3 SW-9A 3 4 TB4 TB4 SW-9A 3 4 TB4 REMOVE JUMPER 054-104 UNITS 13 14 TB2 TB...

Page 25 - Initial Check; Verify unit has been installed per the Installation Instruc-; Fig. 33 — Modulating Power Exhaust and Inlet

MODULATING POWER EXHAUST — The tubing for thebuilding pressure control (achieved via the Modulating PowerExhaust option) should sample building pressure in the areanear the entrance lobby (or other appropriate and sensitivelocation) so that location is controlled as closely to designpressures as pos...

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

Table 9 — Potentiometer Inputs and Ranges POTENTIOMETER DESCRIPTION LOCATION CONTROL VALID RANGE DEFAULT VALUE P1 Supply Air Set Point Display Board 45 to 70 F 45 F if -22 F < P1 < 45 F70 F if P1 > 70 F OR IF P1 < -22 F P2* Economizer Position Economizer Motor 0 to 100% None (0 if P2 is ...

Page 27 - Table 12 — DIP Switches; Adjusting Set Points; — Set points for unit operation; Potentiometers; — All of the set point potentiometers

DIP SWITCH NO. 1 — Supply Air Set Point (SASP) ResetType. Factory setting is OFF. Do not change. DIP SWITCH NO. 2 — SASP Reset Enabled. Factory set-ting is OFF (no SASP reset enabled). If SASP reset has beeninstalled, enable it by changing switch position to ON. DIP SWITCH NO. 3 — Economizer option....

Page 28 - Supply Fan Control with IGV Option; — The inlet; Supply Fan Control with VFD Option; — The VFD

Supply Fan Control with IGV Option — The inlet guide vane option will modulate the supply fan airflow inorder to maintain the static pressure in the supply duct. Theset point for duct static pressure is established at the differ-ential pressure switch for the IGV control. SIZE 034-048 UNITS — The in...

Page 29 - Fig. 39 — Differential Pressure Switch for Inlet Guide; SPEED CTRL; SETUP; STOP; Fig. 40 — Variable Frequency Drive Keypad

DETERMINE VFD SET POINT — The unit of measure forthe Duct Pressure set point at the VFD is output frequency(Hz), representing the desired DP set point (DPSP) in inchesof water gage (in. wg). To convert desired DPSP into theVFD set point, refer to Table 13. Locate the pressure valuein the table close...

Page 30 - Table 13 — VFD Set Point (Frequency Command) for Duct Pressure; — The Modulating Power Exhaust system will main-

Table 13 — VFD Set Point (Frequency Command) for Duct Pressure PRESSURE (in. wg) VFD SET POINT (Hz) CONTROL SIGNAL (mA) PRESSURE (in. wg) VFD SET POINT (Hz) CONTROL SIGNAL (mA) 0.00 0 4.0 2.00 24 10.4 0.25 3 4.8 2.25 27 11.2 0.50 6 5.6 2.50 30 12.0 0.75 9 6.4 2.75 33 12.8 1.00 12 7.2 3.00 36 13.6 1....

Page 32 - Table 15 — Quick Test, Unit Configuration and Switch Check

Table 15 — Quick Test, Unit Configuration and Switch Check QUICK TEST STEP NO. NORMAL DISPLAY DESCRIPTION CONTROL SWITCH 1. 01 Type Unit — Air-Cooled VAV Configuration Header 2. 2 No. of Compressors Configuration Header 3. 2 1 No. of Unloaders(034,038,048-088) (044, 104) DIP Switch No. 6 and 7 4. 60...

Page 34 - Table 18 — Sensor Resistance Values; OPERATING INFORMATION

Table 18 — Sensor Resistance Values TEMP (F) RESISTANCE (Ohms) TEMP (F) RESISTANCE (Ohms) TEMP (F) RESISTANCE (Ohms) −60 362,640 45 11,396 150 1,020 −55 297,140 50 9,950 155 929 −50 245,245 55 8,709 160 844 −45 202,841 60 7,642 165 768 −40 168,250 65 6,749 170 699 −35 139,960 70 5,944 175 640 −30 11...

Page 35 - Operating Sequence —

Operating Sequence — The sequence presented be- low assumes that the unit is equipped with heat for morningwarm-up and an economizer. If these items are not enabledwith the appropriate DIP switches, the processor bypassesthese subroutines. This sequence is also based on an EPROM(erasable, programmab...

Page 36 - Head Pressure Control —

SIZE 044 UNITS — These units have 2 compressors and 1unloader on compressor no. 1. See Fig. 42 for compressorand condenser fan motor locations. The unit operating se-quence is as follows:Stage 1 Relays K1 and K3 are energized. Compressorno. 1 starts with the unloader energized. Com-pressor no. 1 is ...

Page 42 - Table 19 — Compressor Loading and Unloading Sequences

Table 19 — Compressor Loading and Unloading Sequences COOLING STAGE SIZE 034 UNITS Lead Circuit Lag Circuit Active Cylinders Percent Capacity Comp 1 Unloader U1 Unloader U2 Comp 2 0 OFF OFF OFF OFF 0 0 1 ON ON ON OFF 2 17 2 ON ON OFF OFF 4 33 3 ON OFF OFF OFF 6 50 4 ON ON ON ON 8 67 5 ON ON OFF ON 1...

Page 43 - Table 19 — Compressor Loading and Unloading Sequences (cont)

Table 19 — Compressor Loading and Unloading Sequences (cont) COOLING STAGE SIZE 054 UNITS Lead Circuit Lag Circuit Active Cylinders Percent Capacity Comp 1 Unloader U1 Unloader U2 Comp 2 0 OFF OFF OFF OFF 0 0 1 ON ON ON OFF 2 20 2 ON ON OFF OFF 4 40 3 ON OFF OFF OFF 6 60 4 ON ON OFF ON 10 80 5 ON OF...

Page 44 - Table 21 — Operation Status Codes; Restart Procedure —; Table 20 — Controls Troubleshooting

TROUBLESHOOTING By using the display module, actual operating conditions of the unit are displayed while it is running. The Quick Testfunction allows proper operation of compressors, compres-sor unloaders, fans, and other components to be checked whileunit is stopped. If an operating fault is detect...

Page 45 - Diagnostic Codes —; Table 22 — Diagnostic Codes

Diagnostic Codes — Diagnostic codes are warnings of abnormal or fault conditions, and may cause either onecircuit or the whole unit to shut down. They are assignedcode numbers as described below. Table 22 contains a description of each diagnostic code error and possible cause. Manual reset is accomp...

Page 48 - Fig. 48 — Processor Board Test Points; Fig. 49 — Relay Board Test Points

These 2 steps will help determine if a component other than a board is at fault or if the problem is external to controlcircuit. A volt-ohmmeter will be needed to troubleshoot boards. A digital meter is preferred but a Simpson 260 or equivalentwill work. To prevent damage to solid-state electronic c...

Page 49 - Table 23 — Voltage Reading; Place the other lead on terminals shown in table below,; nector J1, and mark them for later replacement.

Step 5 — Check Relay Board Outputs from the ProcessorBoard — This step involves checking the output signals fromrelays K1-K3 on the relay board.1. Turn power to OFF position.2. Connect negative test probe to TP19 (meter still set to dc). 3. Turn switch to ON position and enter Quick Test mode.4. Con...

Page 51 - Enthalpy Sensor Checkout; Table 28 — Enthalpy Sensor Checkout

Table 27 — Terminal Strip J5 Connector Resistance Reading QUICK TEST STEP NO. J5 PIN NUMBERS 1 2 3 4 5 1. to 2.5. ` ` ` ` 0 2.6 0 0 ` ` 0 2.7. 0 ` 0 ` 0 2.8. 0 ` ` 0 0 2.9. to 3.3. 0 ` ` ` 0 LEGEND ` — Infinity Step 2 — Check the Display LEDs1. Enter Quick Test mode. 88 2. If is not displayed, repla...

Page 53 - Table 29 — Carrier Default Program Parameter Values

Table 29 — Carrier Default Program Parameter Values PARAMETER GROUP PARAMETER DEFAULT VALUE SEtP (Setup) ACC1 60.0 Sec DEC1 60.0 Sec UL 60.0 Hz LL 10.0 Hz* Luln 1 P3 20% F-P3 0.0 Hz P4 100% F-P4 60 Hz tHr1 See Table 31 StC1 0 StL1 110% OLN 1 tYP 5* Gr.F (Fundamental) FH 60 Hz Pt 2 Gr.Fb (Feedback) F...

Page 54 - VFD Operation —; VFD Operational Status —; Table 30 — Required User Adjusted Defaults; Unit Wiring —; Fig. 53 — Variable Frequency Drive Terminal Block

VFD Operation — When troubleshooting the VFD, check first that all required conditions for VFD operation aresatisfied. For the VFD to run, the following conditions must be met at the VFD:1. Drive enable jumper is installed from terminals CC-ST (factory supplied) (see Fig. 53 and 54). 2. Proper rotat...

Page 55 - LEGEND AND NOTES FOR FIG. 55

LEGEND AND NOTES FOR FIG. 55 ALM — Alarm C — Contactor CB — Circuit Breaker CCB — Control Circuit Breaker COMP — CompressorCH — Crankcase Heater CR — Control Relay DPS — Differential Pressure Switch DPT — Discharge Pressure Transducer EAT — Enering-Air Temperature EC — Enthalpy Control ECR — Economi...

Page 58 - SERVICE TRAINING; ] Packaged Service Training

SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equip-ment discussed in this manual, including: • Unit Familiarization• Installation Overview • Maintenance• Operating Sequence A large selection of product, theory, and skills programs are ava...

Page 59 - CONTROL SETTINGS

START-UP CHECKLIST MODEL NO.: DATE: SERIAL NO.: TECHNICIAN: I. PRE-START-UP: M VERIFY THAT UNIT IS LEVEL M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT M LOOSEN ALL SHIPPING HOLDDOWN BOLTS AND REMOVE SHIPPING BRACKETS PER INSTRUCTIONS M VERIFY THAT COMPRESSOR SUSPENSION SPRINGS HAVE...

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User Manual Carrier 48FK

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Manual Carrier 48FK

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Carrier Manuals