Carrier 48DK024 - Page 9

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FAN DISCHARGE/ELECTRIC HEAT SECTION

Fig. 11 — Thermistor T1 Location, 50DK034,044 Units

GAS SECTION (48DK) FAN DISCHARGE/ELECTRIC HEAT

SECTION (50DY)

Fig. 12 — Thermistor T1 Location, 48DK/50DY054-074 Units

Main Page

Table of Contents1
T3 - Saturated Condensing Temperature, Circuit1
Introduction2
Processor Board2
- P2 - Economizer Position2
- P3 - Reset Limit4
- P4 - Demand Limit4
- P6 - Warm-Up Set Point4
- Configuration Header and Dip Switch Assembly5
VAV Control System2
Display Board5
Relay Board5
Thermistors5
- T2 - Return-Air Thermistor7
- T4 - Saturated Condensing Temperature, Circuit7
- T10 - Reset Temperature7
Accessory Board7
- P3 - Reset Limit7
- P6 - Morning Warm-Up Temperature7
Compressor Operation7
- Control Relay (Cr)7
Demand Limit Control Module (DLCM)12
Digital Display12
- Codes 0 through 6, Capacity Steps12
- Codes 20 through 30 and 88, Operational12
- Codes 51 through 87, Overload Information13
Operating Information12
Single-Step Demand Unit12
Operating Sequence13
- Size 024-034 and 054-074 Units13
- Size 044 Units14
Head Pressure Control14
- Size 024-030 Units14
- Size 034-074 Units14
Inlet Guide Vanes14
Temperature Reset14
Building Pressurization Mode17
Demand Limit Control17
Quick Test Program17
Smoke Purge Mode17
Units Equipped with Static Pressure Control17
Inlet Guide Vane Differential Pressure Switch21
- Pressure Control Option)21
Inlet Guide Vane Motor21
- Vanes and Static Pressure Control Option)21
Modulating Power Exhaust Differential Pressure Switch21
Service and Troubleshooting21
Differential Pressure Switch Set Point and Null22
- Span22
- And Static Pressure Control Option)22
Differential Pressure Switch Set Point and Null Span (Units Equipped with Modulating Power Exhaust Option)23
VAV Diagnostic Information23
- Codes 59 and 60: Low-Pressure Switch24
- Codes 63 and 64: Oil Pressure Switch24
- Codes 71 to 76: Thermistor/Resistor Failure24
- Code 81: Reset Thermistor or Potentiometer Failure24
- Potentiometer Failure24
- Code 83: Economizer Feedback24
- Code 84: Reset Limit Potentiometer Failure24
- Code 85: Demand Limit Potentiometer (P4) Failure25
- Code 86: Minimum Position Economizer Potentiometer Failure25
- Code 87: Warm-Up Temperature Set Point25
Electronic Controls Checkout25
- Display Board Checkout28
- Two-Step Demand Limit Control Module29
Control Wiring29
Thermistor Troubleshooting29

Carrier 48DK024 - Page 9

Table of Contents

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