Carrier 48JK038 Manuals

Manuals and User Guides for Carrier 48JK038. We have 1 Carrier 48JK038 manual available for free PDF download: Controls Operation And Troubleshooting

Carrier 48JK038 Controls Operation And Troubleshooting

Carrier 48JK038 Controls Operation And Troubleshooting (60 pages)

Variable-Air Volume Rooftop Units

Brand: Carrier | Category: Air Conditioner | Size: 1.91 MB

Table of Contents

Table of Contents
1
Circuit 2
1
General
2
Processor Board
2
- P3 - Reset Limit
  5
- P4 - Demand Limit
  5
- Assembly
  5
Rooftop Information
2
Safety Considerations
2
VAV Control System
2
Display Board
5
Relay Board
5
Thermistors
5
- T1 - Supply-Air Temperature Thermistor
  5
  - T2 - Return-Air Temperature Thermistor
    5
  - T3 - Saturated Condensing Temperature
    5
Accessory Board
7
- P3 - Reset Limit
  7
Compressor Operation
7
Demand Limit Control Module (DLCM)
7
Single-Step Demand Unit
7
Economizer
10
- Enthalpy Control
  10
  - Differential Enthalpy
    10
Temperature Reset
12
- Controls Installation
  13
Variable Frequency Drive (VFD)
12
Control Wiring
13
- Night Setback Thermostat
  13
  - Space Temperature Reset Accessory
    13
Space Temperature Reset
13
INSTALLATION CONFIGURATION OPERATING SEQUENCE Demand Limit
18
- Operating Sequence
  19
Control from Remote Building Management
19
- System (BMS)
  19
- Occupied/Unoccupied
  19
- Supply Duct Pressure Set Point Adjustment
  19
- External Alarm Signal
  19
Smoke Control Modes
21
- Pressurization Mode
  22
- Smoke Purge Mode
  22
- Operating Sequence
  22
Air Pressure Tubing
23
Initial Check
25
Start-Up
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
Quick Test Program
31
Start Unit
31
Digital Display
34
- Codes 20 through 30 and 88, Operational Status
  34
Operating Information
34
Operating Sequence
35
Head Pressure Control
36
Modulating Power Exhaust (Option or Accessory Except FY,JY Units)
38
Supply Fan Control with IGV
38
Supply Fan Control with VFD
38
Unit Staging
38
Checking Display Codes
44
Complete Unit Stoppage
44
Restart Procedure
44
Single Circuit Stoppage
44
Troubleshooting
44
Diagnostic Codes
45

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