Carrier NP034-074 Installation, Start-Up And Service Instructions Manual
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Carrier NP034-074 Installation, Start-Up And Service Instructions Manual

Carrier NP034-074 Installation, Start-Up And Service Instructions Manual

Single package heating and cooling units
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GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37
Rigging and Unit Placement . . . . . . . . . . . . . . . . . . 2
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Roof Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Field-Fabricated Ductwork . . . . . . . . . . . . . . . . . . . . 6
Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Install Outdoor Hoods . . . . . . . . . . . . . . . . . . . . . . . 10
Outdoor-Air Inlet Adjustments . . . . . . . . . . . . . . . 10
Field Wire Routing . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• UNIT SIZES 034 AND 044
Field Electrical Connections . . . . . . . . . . . . . . . . . 17
Gas Piping (48 Series Units Only) . . . . . . . . . . . . 36
Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
• UNIT SIZES 034 AND 044
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-41
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . 38
Evaporator-Fan Shipping Brackets . . . . . . . . . . . 38
• UNIT SIZES 034 AND 044
• UNIT SIZES 054-074
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Refrigerant Service Valves . . . . . . . . . . . . . . . . . . . 38
Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Gas Manifold Pressure (48 Series
Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Unit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Leak Test and Dehydration . . . . . . . . . . . . . . . . . . 39
Condenser Fans and Motors . . . . . . . . . . . . . . . . . 40
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Economizer Inlet Screens . . . . . . . . . . . . . . . . . . . 40
Economizer Dampers . . . . . . . . . . . . . . . . . . . . . . . 40
25% Outdoor-Air Damper . . . . . . . . . . . . . . . . . . . . 40
Initial Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41,42
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Operating Sequences . . . . . . . . . . . . . . . . . . . . . . . 41
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
PC 111
Tab
1a 1b
Single Package Heating and Cooling Units
Installation, Start-Up and
Service Instructions
Page
Catalog No. 564-818
Printed in U.S.A.
50DJ,DK,DW,DY,NB,NP034-074
CONTENTS
• COOLING, UNITS WITH ECONOMIZER
• HEATING, UNITS WITH ECONOMIZER
CHANGEOVER THERMOSTAT
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . 42
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-53
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
• ECONOMIZER DAMPER MOTOR
• HEATER BOX (50 Series Units Only)
• 25% OUTDOOR-AIR DAMPER
• RETURN-AIR FILTERS
• CONDENSER FANS AND FAN MOTORS
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
• COMPRESSORS
• FAN SHAFT BEARINGS
Optional Inlet Guide Vanes)
• FAN MOTOR BEARINGS
• DOOR HINGES
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
PRESSURE SWITCH
SWITCH (Units With Optional Inlet Guide Vanes and
Static Pressure Control)
• PULLEY ALIGNMENT
(Evaporator Fan Only)
• 25% OUTDOOR-AIR DAMPER
• REFRIGERANT CHARGE
• PILOT LIGHT OFF (48 Series Units Only)
Form 48/50D,N-9SI
48DJ,DK,NP034-074
Pg 1
3-96
Replaces: 48DJ,DK-3SI;
48/50NB,NP-1SI; 50DJ,DK-9SI
Page

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Summary of Contents for Carrier NP034-074

  • Page 1: Table Of Contents

    Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 1 PC 111 Catalog No. 564-818 1a 1b 50DJ,DK,DW,DY,NB,NP034-074 Single Package Heating and Cooling Units CONTENTS Page • COOLING, UNITS WITH ECONOMIZER •...

  • Page 2: General

    CONTENTS (cont) • AUTOMATIC PILOT ADJUSTMENT (48 Series Units Only) • GAS VALVE ADJUSTMENT (48 Series Units Only) • MAIN BURNER ADJUSTMENT (48 Series Units Only) Main Burner Removal (48 Series Units Only) . . 50 Switch Adjustment ......50 Refrigerant Feed Components .

  • Page 3: Positioning

    NOTES: 1. Sizes 034,044: Rig with 4 cables and spread with two 95 in. (2413 mm) and A long spreader bars. Sizes 054-074: Rig with 4 cables and spread with four 95 in. (2413 mm) and A long spreader bars. 2.
  • Page 4 BASE UNIT* NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Base Unit 48 Series, Low Heat 48 Series, High Heat 50 Series, Horizontal Discharge 50 Series, Vertical Discharge With Economizer 48 Series, Low Heat 48 Series, High Heat 50 Series, Horizontal Discharge 50 Series, Vertical Discharge COMPRESSORS Quantity...Type...
  • Page 5 BASE UNIT* NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Base Unit 48 Series, Low Heat 48 Series, High Heat 50 Series, Horizontal Discharge 50 Series, Vertical Discharge With Economizer 48 Series, Low Heat 48 Series, High Heat 50 Series, Horizontal Discharge 50 Series, Vertical Discharge COMPRESSORS Quantity...Type...

  • Page 6: Field-Fabricated Ductwork

    Table 2 — Operating Weights of Options and Accessories OPTION OR ACCESSORY Roof Curb 48DJ,DK,NP 50DW,DY,NB 50DJ,DK,NP Condenser Section Roof Curb Economizer Power Exhaust Barometric Relief High-Efficiency Filters Bag filters Hail Guard Copper Condenser Coil Fins Electric Heat† Inlet Guide Vanes *Includes hood.
  • Page 7 UNIT UNIT MODEL SIZE 48DJ,DK,NP 6606 50DW,DY,NB 50DJ,DK,NP 6131 48DJ,DK,NP 7825 50DW,DY,NB 50DJ,DK,NP 7344 UNIT LEVELING TOLERANCES DIMENSIONS* (degrees and inches) *From edge of unit to horizontal. ft-in. ft-in. 21-8 ⁄ 4056 13- 3 ⁄ 20-1 ⁄ 3311 10-10 ⁄ 25-8 ⁄...
  • Page 8 UNIT UNIT MODEL SIZE ft-in. 48DJ,DK,NP 054,064 2474 ⁄ 50DW,DY,NB 054,064 50DJ,DK,NP 054,064 2458 ⁄ 48DJ,DK,NP 3383 11-1 ⁄ 50DW,DY,NB 50DJ,DK,NP 3367 11-0 ⁄ UNIT LEVELING TOLERANCES DIMENSIONS* (degrees and inches) *From edge of unit to horizontal. ft-in. ft-in. 8476 27-9 ⁄...
  • Page 9 DIMENSION X UNIT SIZE Ft-in. 054,064 0-10 ⁄ 0-10 ⁄ Fig. 3C — Condenser Section Roof Curb (054-074 Units Only) UNIT LEVELING TOLERANCES (degrees and inches) *From edge of unit to horizontal. NOTE: To prevent the hazard of stagnant water build-up in the drain pan of the indoor-air section, unit can only be pitched as shown.

  • Page 10: Condensate Drains

    Condensate Drains — See Fig. 4A-4D and Fig. 5 for drain locations. The drain assemblies, each consisting of a 10-gage plate with a 1 ⁄ -in. half coupling welded to it, are shipped in the unit fan section. Also included are 16-gage seal plates to cover the drain holes not being used.
  • Page 11 ⁄ 3769 12-4 For smaller service and operational clearances, con- tact Carrier Product Engineering Department. 4. Vertical discharge ducts designed to be attached to accessory roof curb. If unit is mounted on dunnage, support the ducts using cross braces as done on the accessory roof curb.
  • Page 12 ⁄ 3769 For smaller service and operational clearances, con- tact Carrier Product Engineering Department. 4. Vertical discharge ducts designed to be attached to accessory roof curb. If unit is mounted on dunnage, support the ducts using cross braces as done on the accessory roof curb.
  • Page 13 ⁄ Economizer End — 6 -0 (except power exhaust units 10 -0 ) For smaller service and operational clearances, contact Carrier Product Engineering Department. 4. Vertical discharge ducts designed to be attached to accessory roof curb. If unit is mounted on dunnage, support the ducts using cross braces as done on the accessory roof curb.
  • Page 14 37-4 ⁄ Economizer End — 6 -0 (except power exhaust units 10 -0 ) For smaller service and operational clearances, contact Carrier Product En- gineering Department. 4. Vertical discharge ducts designed to be attached to accessory roof curb. If unit is mounted on dunnage, support the ducts using cross braces as done on the accessory roof curb.
  • Page 15 034 UNITS ROOF MOUNT DRAIN 044-074 UNITS Fig. 5 — Drain Location Selection SLAB MOUNT DRAIN Fig. 8 — Condensate Drain Piping Details Fig. 6 — Condensate Drain Location Fig. 9 — Outdoor-Air Hood Fig. 7 — Seal Plate Location...
  • Page 16 Fig. 10 — Outdoor-Air Damper Adjustments (Inside of Hood Shown) ENTHALPY SENSOR Fig. 11 — Enthalpy Sensor Fig. 12 — Enthalpy Sensor Location CONTROL CONTROL POINT CURVE (Approx Deg) AT 50% RH Fig. 13 — Psychrometric Chart for Enthalpy Control...

  • Page 17: Power Wiring

    NOTES: 1. Switches shown in high enthalpy state. Terminals 2 and 3 close on enthalpy decrease. 2. When standard economizer is used with accessory differential en- thalpy sensor, set enthalpy control to ‘‘D’’ setting. Fig. 14 — Wiring Connections for Solid-State Enthalpy Sensor (HH57AC077) Fig.
  • Page 18 Use care when drilling into corner post to avoid damage to con- denser coil. Fig. 17 — Disconnect Location, 054-074 Units POWER WIRING — Units are factory wired for the voltage shown on the unit nameplate. The main terminal block is suitable for use with aluminum or copper wires.
  • Page 19 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 187-254 53.2 266.0 53.2 266.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 20 Table 3 — Electrical Data, 034 Units (cont) COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 414-508 28.8 120.0 28.8 120.0 460-3-60 (V-Ph-Hz) BASE UNIT ONLY Total MOCP 11.0 81.2 10.0 14.0 84.2 15.0 21.0 91.2 20.0 27.0 97.2 BASE UNIT WITH EXHAUST ELECTRIC EXHAUST FAN...
  • Page 21 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 518-632 23.1 96.0 23.1 96.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 22 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE Total 187-254 69.2 345.0 69.2 345.0 16.2 Table 4 — Electrical Data, 044 Units 208/230-3-60 (V-Ph-Hz) BASE UNIT EXHAUST ONLY Total MOCP 21.2/20.0 10.0 33.4/30.0 15.0 48.4/44.0 — — — 21.2/20.0 24.2/ 196.1/ 250/ 21.2/20.0...
  • Page 23 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 414-508 34.6 173.0 34.6 173.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 24 Table 4 — Electrical Data, 044 Units (cont) COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 518-632 26.7 120.0 26.7 120.0 575-3-60 (V-Ph-Hz) BASE UNIT ONLY Total MOCP 76.3 10.0 11.0 78.3 15.0 17.0 84.3 20.0 22.0 89.3 BASE UNIT WITH EXHAUST ELECTRIC EXHAUST FAN...
  • Page 25 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 187-254 107.7 506.0 74.4 345.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 26 Table 5 — Electrical Data, 054 Units (cont) COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 414-508 50.6 253.0 34.6 173.0 460-3-60 (V-Ph-Hz) BASE UNIT ONLY Total MOCP 15.0 21.0 129.6 20.0 27.0 135.6 10.8 25.0 34.0 142.6 30.0 40.0 148.6 BASE UNIT WITH EXHAUST...
  • Page 27 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 518-632 39.1 176.0 28.8 120.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 28 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 187-254 107.7 506.0 107.0 506.0 Table 6 — Electrical Data, 064 Units 208/230-3-60 (V-Ph-Hz) BASE UNIT EXHAUST ONLY Total Total MOCP 10.0 15.0 20.0 — — — 10.0 46.2/ 310.1/ 400/ 15.0 10.0 42.0 305.9...
  • Page 29 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 414-508 50.6 253.0 50.6 253.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 30 Table 6 — Electrical Data, 064 Units (cont) COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 518-632 39.1 176.0 39.1 176.0 575-3-60 (V-Ph-Hz) BASE UNIT ONLY Total MOCP 15.0 17.0 114.6 20.0 22.0 119.6 25.0 27.0 124.6 30.0 32.0 129.6 BASE UNIT WITH EXHAUST ELECTRIC...
  • Page 31 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 187-254 107.7 506.0 142.3 690.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...
  • Page 32 Table 7 — Electrical Data, 074 Units (cont) COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 414-508 50.6 253.0 65.4 345.0 460-3-60 (V-Ph-Hz) BASE UNIT ONLY Total MOCP 15.0 21.0 166.8 20.0 27.0 172.8 13.5 25.0 34.0 179.8 30.0 40.0 185.8 BASE UNIT WITH EXHAUST...
  • Page 33 COMPR COMPR NO. 1 NO. 2 VOLTAGE RANGE 518-632 39.1 176.0 52.6 276.0 LEGEND — Constant Volume — ETL Testing Laboratory — Full Load Amps — Nominal Horsepower — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps (for wire sizing) MOCP —...

  • Page 34: Control Wiring

    CONTROL WIRING — Install a Carrier-approved acces- sory 24-v thermostat assembly according to the installation instructions shipped with the accessory. Locate thermostat assembly to sense average temperature. Route thermostat cable or equivalent leads of colored wire from subbase terminals to terminal board (P1). The terminal board (P1) is located on...
  • Page 35 034 AND 044 UNITS 054-074 UNITS BASE UNIT BASE UNIT BASE UNIT OPTIONAL MODULATING POWER EXHAUST OPTIONAL MODULATING POWER EXHAUST OPTIONAL NON-MODULATING EXHAUST OPTIONAL NON-MODULATING EXHAUST Fig. 20 — Field Wiring for Building Pressurization and Smoke Purge...

  • Page 36: Gas Piping (48 Series Units Only)

    Gas Piping (48 Series Units Only) — for use with natural gas only. Installation must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1. A 1/8-in. NPT tapping plug, accessible for test gage con- nection, must be field installed immediately upstream of gas supply connection to unit, but after manual gas valve.

  • Page 37: Only)

    Fig. 24 — Flue Hood FLUE DEFLECTOR BAFFLE (BOTTOM HOOD ONLY) FLUE DEFLECTOR BAFFLE (BOTH HOODS) Fig. 25 — Flue Deflector Baffles, 034,044 Units FLUE DEFLECTOR BAFFLE FOR BOTTOM HOOD ONLY Fig. 26 — Flue Deflector Hood, 034,044 Units (Assembled) FLUE AND FLUE DEFLECTOR...

  • Page 38: Unit Sizes

    If oil level is below the sight glass and cannot be seen, add oil until the level is approximately 1/4 of sight glass. See Carrier Standard Service Techniques, Refriger- ants section, for procedures to add or remove oil. Fig. 31 — Shipping Brackets; 48 Series 054-074 Units and 50 Series Horizontal Discharge 054-074 Units Table 8 —...

  • Page 39: Units Only)

    After leaks are re- paired, remove and recover refrigerant from the system. For leak testing procedures, see Carrier Standard Service Tech- niques, Refrigerants section. Do not use the system com- pressors to remove refrigerant from the system.

  • Page 40: Condenser Fans And Motors

    Table 9B — Field-Supplied Evaporator-Fan Pulley Data, 054-074 Units MOTOR PULLEY Type Size (in.) Grooves IFM — Indoor (Evaporator) Fan Motor Check rotation of wheel with arrow on the fan housing. Check fan speed with a strobe-type tachometer, or use this formula: motor rpm x motor sheave pitch diameter (in.) fan sheave pitch diameter (in.)

  • Page 41: Initial Check

    Fig. 32 — Condenser-Fan Adjustment Initial Check IMPORTANT: Do not attempt to start unit, even mo- mentarily, until all items on the Start-Up Checklist and the following steps have been completed. 1. Verify unit has been installed per the Installation section of this literature.

  • Page 42: Ventilation Air Circulation (Continuous Fan)

    When the first-stage thermostat is satisfied, first-stage main gas valve and the pilot valve close. Induced-draft motor shuts off. Time-delay relay (built into constant volume control board) opens and timer sequence begins. When sequence is com- plete (after 110 ± 5 seconds) evaporator-fan motor shuts off. 48 Series High-Heat Units —...

  • Page 43: Liquid Service Valves, Filter Driers, And Sight Glasses

    Fig. 33 — Door Latch LIQUID SERVICE VALVES, FILTER DRIERS, AND SIGHT GLASSES Sizes 034 and 044 — Access to these components is through the access panel on the right side of the unit. See Fig. 34. There is also a Schrader port in each suction line that is ac- cessible through this same panel.

  • Page 44: Unit Sizes 034 And

    NOTE: High heat consists of sections 1 and 2. Low heat consists of section 1 only. Fig. 37 — Gas Section Detail, 48 Series 034 and 044 Units NOTE: High heat consists of sections 1-3. Low heat consists of section 1 and 2 only. Fig.

  • Page 45: Modulating Power Exhaust Damper Motor

    NOTE: Only the heater element contactors are located in the heater box. The heaters are located in the unit airstream. 25% OUTDOOR-AIR DAMPER — Access to adjust the damper is through the hoods. Remove filters to gain access into unit to adjust linkage arms. MODULATING POWER EXHAUST DAMPER MOTOR —...

  • Page 46: Adjustments

    Adjustments EVAPORATOR FAN AND POWER EXHAUST MOTOR PLATE — Adjust using a ⁄ -in. wrench on the adjusting bolts: 1. Loosen holddown bolts. (See Fig. 44.) 2. Turn the adjusting bolts to move the motor mounting plate toward or away from the fan to loosen or tighten the belts. Make the same number of turns to each bolt.
  • Page 47 Fig. 45 — Pulley Alignment 25% OUTDOOR-AIR DAMPER — See Manual Outdoor- Air Damper section on page 10 for adjustment details. REFRIGERANT CHARGE — All units are shipped with a complete operating charge of R-22. See unit nameplate and Tables 1A and 1B for amount of charge. When adding a com- plete charge, evacuate system using standard evacuating pro- cedures and weigh in the specified amount of charge.
  • Page 48 Fig. 49 — Charging Chart, 034 Units; System 2, All Condenser Fans Running Fig. 50 — Charging Chart, 044 Units; System 1, One Condenser Fan Running Fig. 51 — Charging Chart, 044 Units; System 1, All Condenser Fans Running Fig. 52 — Charging Chart, 044 Units; System 2, One Condenser Fan Running Fig.

  • Page 49: Automatic Pilot Adjustment (48 Series Units Only)

    Fig. 55 — Charging Chart, 054 Units; System 2, All Condenser Fans Running Fig. 56 — Charging Chart, 064 Units; System 1, All Condenser Fans Running Fig. 57 — Charging Chart, 064 Units; System 2, All Condenser Fans Running Fig. 58 — Charging Chart, 074 Units; System 1, All Condenser Fans Running Fig.

  • Page 50: Gas Valve Adjustment (48 Series Units Only)

    GAS VALVE ADJUSTMENT (48 Series Units Only) — The gas valve opens and closes in response to the thermostat or limit control. When power is supplied to valve terminal 3 (D1 on low heat), the pilot valve opens to the preset posi- tion.

  • Page 51: Moisture/Liquid Indicator

    Yellow — moisture above 130 ppm (wet) Change filter driers at the first sign of moisture in the sys- tem. See Carrier Charging Handbook for more information. IMPORTANT: Unit must be in operation at least 12 hours before moisture indicator can give an accu- rate reading.

  • Page 52: Control Circuit, 115 V

    Fig. 62 — Typical Compressor Overtemperature, High- and Low-Pressure Switch Locations Table 11 — Pressure Switch Settings (psig) SWITCH CUTOUT High Control Circuit, 115 V — This control circuit is pro- tected against overcurrent by a 5-amp circuit breaker. Breaker can be reset.

  • Page 53: Unit Control Board Checkout

    Table 14 — Economizer Control Board Checkout, Test 2 MOTOR PROCEDURE EXPECTED RESULT TEST Turn enthalpy set point 1. The relays energize. If not, potentiometer to the check return enthalpy re- A position. sistor. If resistor is o.k., control board is faulty. 2.
  • Page 54 LEGEND CLO — Compressor Lockout — Plug — Safety Circuit Fig. 64 — Control Board Component Arrangement Symptom: Evaporator fan will not operate. 1. Turn unit power off and disconnect plug P1 from the con- trol board. 2. Install a jumper across Pin R and Pin G at plug P1 on the control board.
  • Page 55 c. If proper voltage is indicated at the contactor and con- tactor closes, the board is operating properly. 8. To verify compressor lockout logic: a. Disconnect CLO sensor wires connected to CLO1 at the control board. Check wires for continuity. If there is no continuity, replace the sensor.
  • Page 56 LEGEND CLO — Compressor Lockout — Plug — Safety Circuit Fig. 65 — Compressor Lockout Connections...
  • Page 57 LEGEND FOR FIG. 66-73 — Accessory — Building Pressure — Contactor — Circuit Breaker — Control Circuit Breaker — Check Filter Switch — Compressor Lockout — Common COMM — Communication Plug COMP — Compressor COND — Condenser — Control Relay —...
  • Page 58 Fig. 66 — Gas Heat Sections; 48DJ,NP034,044 Units...
  • Page 68 Fig. 72 — Typical Control Wiring Schematic; 48/50NP,50NB Units (054-074 Shown) (cont)
  • Page 70 For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are included (U.S.A. and Canada only). Copyright 1996 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

  • Page 72: Start-Up Checklist

    VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 47-49 GENERAL ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS Copyright 1996 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 1 PC 111 Catalog No.

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