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Carrier NP034-074 manual

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Table of contents for the manual

  • Page 1

    Installation, Start-Up and Service Instructions CONTENTS Page GENERAL ...................................2 SAFETY CONSIDERA TIONS ...................2 INST ALLA TION ............................. 2-37 Rigging and Unit Placement ..................2 Roof Curb ...................................2 Roof Mount ..................................2 Slab Mou[...]

  • Page 2

    CONTENTS (cont) • AUTOMA TIC PILOT ADJUSTMENT (48 Series Units Only) • GAS V AL VE ADJUSTMENT (48 Series Units Only) • MAIN BURNER ADJUSTMENT (48 Series Units Only) Main Burner Removal (48 Series Units Only) ..5 0 Switch Adjustment .........................5 0 Refrigerant Feed Components ...............5 0 Thermostatic Expansion V alve (TXV) [...]

  • Page 3

    If roof curb is not used, support unit with steel beams along its entire length and then support steel as required. As a mini- mum, unit must be supported across its width at each lifting lug location. Positioning — Provide clearance around and above unit for airflow , safety , and service access. Do not restrict top (area above condenser fans) [...]

  • Page 4

    T able 1A — Physical Data; 034, 044 Units BASE UNIT* 034 044 NOMINAL CAP ACITY (tons) 30 40 OPERA TING WEIGHT (lb) Base Unit 48 Series, Low Heat 5641 6541 48 Series, High Heat 5770 6670 50 Series, Horizontal Discharge 5970 6620 50 Series, V ertical Discharge 5400 6050 With Economizer 48 Series, Low Heat 5941 6841 48 Series, High Heat 6070 6970 50[...]

  • Page 5

    T able 1B — Physical Data; 054-074 Units BASE UNIT* 054 064 074 NOMINAL CAP ACITY (tons) 50 60 75 OPERA TING WEIGHT (lb) Base Unit 48 Series, Low Heat 8700 9000 9420 48 Series, High Heat 8820 9120 9550 50 Series, Horizontal Discharge 8250 8550 8970 50 Series, V ertical Discharge 7700 8000 8430 With Economizer 48 Series, Low Heat 9230 9530 9950 48[...]

  • Page 6

    T able 2 — Operating Weights of Options and Accessories OPTION OR ACCESSORY UNIT SIZE 034 044 054 064 074 Roof Curb 48DJ,DK,NP 50DW ,DY ,NB 50DJ,DK,NP 450 450 380 480 480 465 515 560 515 515 560 515 515 560 515 Condenser Section Roof Curb — — 540 540 625 Economizer 300* 300* 530* 530* 530* Power Exhaust 600* 600* 710* 710* 710* Barometric Rel[...]

  • Page 7

    UNIT MODEL UNIT SIZE XY mm ft-in. mm ft-in. 48DJ,DK,NP 034 6606 21-8 1 ⁄ 16 4056 13- 3 11 ⁄ 16 50DW ,DY ,NB 034 50DJ,DK,NP 034 6131 20-1 3 ⁄ 8 331 1 10-10 3 ⁄ 8 48DJ,DK,NP 044 7825 25-8 1 ⁄ 16 4893 16- 0 5 ⁄ 8 50DW ,DY ,NB 044 50DJ,DK,NP 044 7344 24-1 1 ⁄ 8 4141 13- 7 1 ⁄ 16 UNIT LEVELING TOLERANCES DIMENSIONS* (degrees and inches) [...]

  • Page 8

    UNIT MODEL UNIT SIZE XY Z mm ft-in. mm ft-in. mm ft-in. 48DJ,DK,NP 054,064 2474 8-1 3 ⁄ 8 8476 27-9 11 ⁄ 16 6965 22-10 3 ⁄ 16 50DW ,DY ,NB 054,064 50DJ,DK,NP 054,064 2458 8-0 3 ⁄ 4 7444 24-5 1 ⁄ 16 5933 19- 5 9 ⁄ 16 48DJ,DK,NP 074 3383 1 1-1 3 ⁄ 16 8476 27-9 11 ⁄ 16 6965 22-10 3 ⁄ 16 50DW ,DY ,NB 074 50DJ,DK,NP 074 3367 1 1-0 9 ?[...]

  • Page 9

    UNIT SIZE DIMENSION X mm Ft-in. 054,064 270 0-10 5 ⁄ 8 074 255 0-10 1 ⁄ 16 UNIT LEVELING TOLERANCES DIMENSIONS* (degrees and inches) AB Deg in. Deg in. 1.0 2.0 .50 .75 *From edge of unit to horizontal. NOTE: T o prevent the hazard of stagnant water build-up in the drain pan of the indoor-air section, unit can only be pitched as shown. Fig. 3C ?[...]

  • Page 10

    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 1 ⁄ 4 -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. Open the access door marked F AN SECTION to find the drai[...]

  • Page 11

    UNIT SIZE WEIGHT A B C D E F G H J lb kg mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. 48DJD,DKD,NPD 034 5641 2559 4498 14-9 1 ⁄ 8 3662 12-0 3 ⁄ 16 7278 23-10 9 ⁄ 16 1709 5-7 5 ⁄ 16 2216 7- 3 1 ⁄ 4 4228 13-10 7 ⁄ 16 2746 9-0 1 ⁄ 8 — — 3626 12-10 9 ⁄ 16 48DJE,NPE 5770 2617 4474 14-8 1 ?[...]

  • Page 12

    UNIT SIZE WEIGHT A B C D E F G H lb kg mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. 50DJ,DK,NP 034 5400 2449 4198 13-9 1 ⁄ 4 2916 9-6 13 ⁄ 16 6802 22-3 13 ⁄ 16 171 1 5-7 3 ⁄ 8 2216 7- 3 1 ⁄ 4 4428 9-0 1 ⁄ 8 3762 12-4 3 ⁄ 8 —— 044 6050 2744 4948 16-2 13 ⁄ 16 3746 12-3 1 ⁄ 2 8015 26-3 9 ⁄ 16 [...]

  • Page 13

    UNIT SIZE WEIGHT A B C D E F G lb kg mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. 48DJD,DKD,NPD 054 8700 3946 5969 19-7 6717 22-0 7 ⁄ 16 1 163 3-9 13 ⁄ 16 1 1,524 37-9 11 ⁄ 16 2718 8-1 1 6541 21-5 1 ⁄ 2 1 1,140 36-6 9 ⁄ 16 48DJE,NPE 8820 4000 50DW ,DY ,NB 8250 3742 6045 19-10 7676 25-2 3 ⁄ 16 2830 9-3 3 ⁄ 4 64[...]

  • Page 14

    UNIT SIZE Weight A B C D E F Lb Kg mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. 50DJ,DK,NP 054 7700 3493 5537 18-2 1 163 3-9 13 ⁄ 16 10,476 34-4 7 ⁄ 16 2864 9-4 3 ⁄ 4 10,092 33-1 5 ⁄ 16 5347 17-6 1 ⁄ 2 064 8000 3629 074 8430 3824 5969 21-3 1 163 3-9 13 ⁄ 16 1 1,385 37-4 1 ⁄ 4 3727 12-2 3 ⁄ 4 1 1,001 36-1 1 ⁄ 8 4483 [...]

  • Page 15

    034 UNITS 044-074 UNITS Fig. 5 — Drain Location Selection Fig. 6 — Condensate Drain Location Fig. 7 — Seal Plate Location ROOF MOUNT DRAIN SLAB MOUNT DRAIN Fig. 8 — Condensate Drain Piping Details Fig. 9 — Outdoor-Air Hood 15[...]

  • Page 16

    Fig. 10 — Outdoor-Air Damper Adjustments (Inside of Hood Shown) O ENTHALPY SENSOR Fig. 1 1 — Enthalpy Sensor Fig. 12 — Enthalpy Sensor Location CONTROL CURVE CONTROL POINT (Approx Deg) A T 50% RH A 73 B 68 C 63 D 58 Fig. 13 — Psychrometric Chart for Enthalpy Control 16[...]

  • Page 17

    Field Wire Routing UNIT SIZES 034 AND 044 — Field wiring can be brought into the unit through the basepan and roof curb or through the corner post in the side of the unit next to the control box. A 3-1/2 in. NPT coupling for field power and a 3/4-in. NPT coupling for 24 v control wiring are provided in the basepan. There are two 4-5/8 in. knocko[...]

  • Page 18

    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. Maximum wire size is 3/0 A WG (American W ire Gage). When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (MOCP [Maxi- mum Overcurrent Protection][...]

  • Page 19

    T able 3 — Electrical Data, 034 Units 208/230-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 187-254 53.2 266.0 53.2 266.0 10.8 7.5 24.2/ 22.0 154.7/ 152.5[...]

  • Page 20

    T able 3 — Electrical Data, 034 Units (cont) 460-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 414-508 28.8 120.0 28.8 120.0 5.4 7.5 1 1.0 81.2 100 6.0 9.[...]

  • Page 21

    T able 3 — Electrical Data, 034 Units (cont) 575-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 518-632 23.1 96.0 23.1 96.0 4.8 7.5 9.0 65.8 80 6.0 7.8 —[...]

  • Page 22

    T able 4 — Electrical Data, 044 Units 208/230-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 187-254 69.2 345.0 69.2 345.0 16.2 7.5 24.2/ 22.0 196.1/ 193.9[...]

  • Page 23

    T able 4 — Electrical Data, 044 Units (cont) 460-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 414-508 34.6 173.0 34.6 173.0 8.1 7.5 1 1.0 96.9 125 6.0 9.[...]

  • Page 24

    T able 4 — Electrical Data, 044 Units (cont) 575-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 518-632 26.7 120.0 26.7 120.0 7.2 7.5 9.0 76.3 100 6.0 7.8 [...]

  • Page 25

    T able 5 — Electrical Data, 054 Units 208/230-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 187-254 107.7 506.0 74.4 345.0 21.6 15.0 46.2/ 42.0 276.8/ 272[...]

  • Page 26

    T able 5 — Electrical Data, 054 Units (cont) 460-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 414-508 50.6 253.0 34.6 173.0 10.8 15.0 21.0 129.6 175 10.0[...]

  • Page 27

    T able 5 — Electrical Data, 054 Units (cont) 575-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 518-632 39.1 176.0 28.8 120.0 9.6 15.0 17.0 104.3 125 10.0 [...]

  • Page 28

    T able 6 — Electrical Data, 064 Units 208/230-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 187-254 107.7 506.0 107.0 506.0 21.6 15.0 46.2/ 42.0 310.1/ 30[...]

  • Page 29

    T able 6 — Electrical Data, 064 Units (cont) 460-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 414-508 50.6 253.0 50.6 253.0 10.8 15.0 21.0 145.6 175 10.0[...]

  • Page 30

    T able 6 — Electrical Data, 064 Units (cont) 575-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 518-632 39.1 176.0 39.1 176.0 9.6 15.0 17.0 114.6 150 10.0 [...]

  • Page 31

    T able 7 — Electrical Data, 074 Units 208/230-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 187-254 107.7 506.0 142.3 690.0 27.8 15.0 46.2/ 42.0 358.8/ 85[...]

  • Page 32

    T able 7 — Electrical Data, 074 Units (cont) 460-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 414-508 50.6 253.0 65.4 345.0 13.5 15.0 21.0 166.8 225 10.0[...]

  • Page 33

    T able 7 — Electrical Data, 074 Units (cont) 575-3-60 (V -Ph-Hz) VOL T AGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONL Y EXHAUST FA N ELECTRIC HEA T* BASE UNIT WITH EXHAUST F AN AND/OR ELECTRIC HEA T* RLA LRA RLA LRA T otal FLA Hp FLA MCA MOCP T otal Hp T otal FLA kW FLA MCA MOCP 518-632 39.1 176.0 52.6 276.0 12.0 15.0 17.0 133.8 175 10.0[...]

  • Page 34

    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 locat[...]

  • Page 35

    034 AND 044 UNITS BASE UNIT OPTIONAL MODULA TING POWER EXHAUST OPTIONAL NON-MODULA TING EXHAUST 054-074 UNITS BASE UNIT BASE UNIT OPTIONAL MODULA TING POWER EXHAUST OPTIONAL NON-MODULA TING EXHAUST Fig. 20 — Field Wiring for Building Pressurization and Smoke Purge 35[...]

  • Page 36

    Gas Piping (48 Series Units Only) — Unit is equipped 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 con[...]

  • Page 37

    Fig. 24 — Flue Hood FLUE DEFLECTOR BAFFLE (BOTTOM HOOD ONL Y) FLUE DEFLECTOR BAFFLE (BOTH HOODS) FLUE DEFLECTOR HOOD Fig. 25 — Flue Deflector Baff les, 034,044 Units TOP (WHEN INST ALLED) FLUE DEFLECTOR BAFFLE FOR BOTTOM HOOD ONL Y Fig. 26 — Flue Deflector Hood, 034,044 Units (Assembled) LARGE INLET HOOD LARGE INLET HOOD LOCA TION (48 SERIE[...]

  • Page 38

    PRE-ST ART -UP Unit Preparation — Check to see that unit has been installed in accordance with these Installation Instructions and all applicable codes. Compressor Mounting — Loosen compressor hold- down bolts until sidewise movement of the washer under each holddown bolt head can be obtained. Do not loosen completely , as bolts are self-lockin[...]

  • Page 39

    If oil charge is above sight glass, do not remove any oil until the compressor crankcase heater has been on for at least 24 hours. When additional oil or a complete char ge is needed, use only Carrier-approved compressor oil. Approved oils: T exaco, Inc. ................................................. Capella WF-32 Shrieve Chemical Co. ..........[...]

  • Page 40

    T able 9B — Field-Supplied Evaporator-Fan Pulley Data, 054-074 Units IFM Hp IFM RPM MOTOR PULLEY BLOWER PULLEY BEL TS 48 Series and 50 Series Horizontal Discharge Units 50 Series V ertical Discharge Units No. Grooves T ype Size (in.) No. Grooves T ype Size (in.) Quantity T ype Size (in.) Quantity T ype Size (in.) 15 450 2 B5V 4.3 2 B5V 18.5 2 5VX[...]

  • Page 41

    Initial Check IMPOR T ANT : 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. V erify unit has been installed per the Installation section of this literature. 2. Certify that all auxiliary components (sensors, controls, etc.) have been installed and wired to [...]

  • Page 42

    When the first-stage thermostat is satisfied, first-stage main gas valve and the pilot valve close. Induced-draft motor shuts of f. T ime-delay relay (built into constant volume control board) opens and timer sequence begins. When sequence is com- plete (after 1 10 ± 5 seconds) evaporator-fan motor shuts of f. 48 Series High-Heat Units — Unit[...]

  • Page 43

    LIQUID SER VICE V AL VES, FIL TER 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. When char ging unit, route service line through the round holes and repl[...]

  • Page 44

    ECONOMIZER DAMPER MOTOR — On units so equipped, the economizer motor is located in the mixing box section. Access to it is through the doors labeled FIL TER SECTION on the sides of the unit. ELECTRIC HEA TER CONTROL BOX (50 Series Units Only) — Access to the electric heater control box is through the door on the right side of the unit next to t[...]

  • Page 45

    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. MODULA TING POWER EXHAUST DAMPER MOT OR — The modulating power exhaust damper motor is [...]

  • Page 46

    Adjustments EV APORA TOR F AN AND POWER EXHAUST MOTOR PLA TE — Adjust using a 15 ⁄ 16 -in. wrench on the adjusting bolts: 1. Loosen holddown bolts. (See Fig. 44.) 2. T urn 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. 3. Retighten hold[...]

  • Page 47

    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 T ables 1A and 1B for amount of charge. When adding a com- plete charge, evacuate system using standard evacuating pro- cedures and weigh i[...]

  • 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. 53 — Charging Chart, 044 Units; System 2,[...]

  • Page 49

    AUTOMA TIC PILOT ADJUSTMENT (48 Series Units Only) 1. Set system selector switch at OFF position to shut of f unit. T urn of f power to unit. 2. Remove screw cap cover on pilot gas valve to expose adjusting screw . 3. T o ensure that main burners do not ignite, remove wire from gas valve terminal 2. T ape wire. Do not allow wire to be grounded. 4. [...]

  • Page 50

    GAS V AL VE 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. When power is supplied to terminal 2 (W1 on low heat), the main valve opens to its preset position. The regulato[...]

  • Page 51

    Moisture/Liquid Indicator — A clear flow of liquid refrigerant indicates suf f icient charge in the system. Bubbles indicate undercharged system or the presence of noncon- densables. Moisture in the system measured in parts per mil- lion (ppm) changes the color of the indicator: Green — moisture below 45 ppm (dry) Chartreuse — 45 to 130 ppm [...]

  • Page 52

    T able 1 1 — Pressure Switch Settings (psig) SWITCH CUTOUT CUT -IN High 426 6 7 320 6 20 Low 27 6 46 7 6 7 Control Circuit, 1 15 V — This control circuit is pro- tected against overcurrent by a 5-amp circuit breaker . Breaker can be reset. If it trips, determine cause of trouble before resetting. Control Circuit, 24 V — This control circuit i[...]

  • Page 53

    T able 14 — Economizer Control Board Checkout, T est 2 MOTOR TEST PROCEDURE EXPECTED RESUL T AND RESPONSE A T urn enthalpy set point potentiometer to the A position. 1. The relays energize. If not, check return enthalpy re- sistor . If resistor is o.k., control board is faulty . 2. Motor drives open. If re- lays energize, but motor does not drive[...]

  • Page 54

    Symptom: Evaporator fan will not operate. 1. T urn unit power of f 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. 3. T urn unit power on and check if the indoor (evaporator) fan contactor (IFC) coil has been pulled in. If the con- tactor has not been pulled in, check the [...]

  • Page 55

    c. If proper voltage is indicated at the contactor and con- tactor closes, the board is operating properly . 8. T o 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 . b. Connect the multimeter to read voltage between Pi[...]

  • Page 56

    LEGEND CLO — Compressor Lockout P— Plug SC — Safety Circuit Fig. 65 — Compressor Lockout Connections 56[...]

  • Page 57

    LEGEND FOR FIG. 66-73 ACC — Accessory BP — Building Pressure C— Contactor CB — Circuit Breaker CCB — Control Circuit Breaker CF — Check Filter Switch CLO — Compressor Lockout COM — Common COMM — Communication Plug COMP — Compressor COND — Condenser CR — Control Relay CS — Centrifugal Switch CV — Constant V olume DP — D[...]

  • Page 58

    Fig. 66 — Gas Heat Sections; 48DJ,NP034,044 Units 58[...]

  • Page 59

    Fig. 67 — Gas Heat Sections; 48DJ,NP054-074 Units 59[...]

  • Page 60

    Fig. 68 — Gas Heat Section; 48DK034,044 Units 60[...]

  • Page 61

    Fig. 69 — Gas Heat Section; 48DK054-074 Units 61[...]

  • Page 62

    Fig. 70 — T ypical Wiring Schematic; 48/50DJ,50DW Units (054-074 Shown) 62[...]

  • Page 63

    Fig. 70 — T ypical Wiring Schematic; 48/50DJ,50DW Units (054-074 Shown) (cont) 63[...]

  • Page 64

    Fig. 71 — T ypical Wiring Schematic; 48/50DK,50DY Units (054-074 Shown) 64[...]

  • Page 65

    Fig. 71 — T ypical Wiring Schematic; 48/50DK,50DY Units (054-074 Shown) (cont) 65[...]

  • Page 66

    Fig. 72 — T ypical Control Wiring Schematic; 48/50NP ,50NB Units (054-074 Shown) 66[...]

  • Page 67

    Fig. 72 — T ypical Control Wiring Schematic; 48/50NP ,50NB Units (054-074 Shown) (cont) 67[...]

  • Page 68

    Fig. 72 — T ypical Control Wiring Schematic; 48/50NP ,50NB Units (054-074 Shown) (cont) 68[...]

  • Page 69

    Fig. 73 — T ypical Power Wiring Schematic; 48/50NP ,50NB Units (054-074, 208/230 and 460 v Shown) 69[...]

  • Page 70

    P ACKAGED SER VICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of the equipment discussed in this manual. Product programs cover: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A lar ge selection of product, theory , and skills programs is available. [...]

  • Page 71

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  • Page 72

    ST ART -UP CHECKLIST MODEL NO.: DA TE: SERIAL NO.: TECHNICIAN: PRE-ST ART -UP: M VERIFY THA T ALL P ACKING MA TERIALS HA VE BEEN REMOVED FROM UNIT M LOOSEN ALL SHIPPING HOLDDOWN BOL TS AND REMOVE SHIPPING BRACKETS PER INSTRUCTIONS M VERIFY INST ALLA TION OF ECONOMIZER HOOD M VERIFY INST ALLA TION OF EXHAUST HOOD M VERIFY THA T CONDENSA TE CONNECTIO[...]