Page 3 - If roof curb is not used, support unit with steel beams along; Positioning —; Provide clearance around and above unit; UNIT; Fig. 1 — Rigging Label
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 liftinglug location. Positioning — Provide clearance around and above unit for airflow, safety, and service access. Do no...
Page 6 - Table 2 — Operating Weights of Options and Accessories; Field-Fabricated Ductwork —; Units are designed for; UNIT CENTER OF GRAVITY AND CORNER WEIGHTS; Fig. 2 — Weight Distribution and Center of Gravity
Table 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 450450380 480480465 515560515 515560515 515560515 Condenser Section Roof Curb — — 540 540 625 Economizer 300* 300* 530* 530* 530* Power Exhaust 600* 600...
Page 15 - ROOF MOUNT DRAIN; Fig. 8 — Condensate Drain Piping Details
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. 13 — Psychrometric Chart for
Fig. 10 — Outdoor-Air Damper Adjustments (Inside of Hood Shown) O ENTHALPYSENSOR Fig. 11 — Enthalpy Sensor Fig. 12 — Enthalpy Sensor Location CONTROL CURVE CONTROL POINT (Approx Deg) AT 50% RH A 73 B 68 C 63 D 58 Fig. 13 — Psychrometric Chart for Enthalpy Control 16
Page 17 - Field Wire Routing; If field power wiring is brought through the roof curb, route; Field Electrical Connections; Fig. 14 — Wiring Connections for Solid-State
Field Wire Routing UNIT SIZES 034 AND 044 — Field wiring can be broughtinto the unit through the basepan and roof curb or throughthe 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 i...
Page 18 - — Ground; Fig. 18 — Field Power Wiring Connections
POWER WIRING — Units are factory wired for the voltageshown on the unit nameplate. The main terminal block issuitable for use with aluminum or copper wires. Maximumwire size is 3/0 AWG (American Wire Gage). When installing units, provide a disconnect per NEC (National Electrical Code) of adequate si...
Page 19 - Table 3 — Electrical Data, 034 Units
Table 3 — Electrical Data, 034 Units 208/230-3-60 (V-Ph-Hz) VOLTAGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONLY EXHAUST FAN ELECTRIC HEAT* BASE UNIT WITH EXHAUST FAN AND/OR ELECTRIC HEAT* RLA LRA RLA LRA Total FLA Hp FLA MCA MOCP Total Hp Total FLA kW FLA MCA MOCP 187-254 53.2 266.0 53.2 26...
Page 22 - Table 4 — Electrical Data, 044 Units
Table 4 — Electrical Data, 044 Units 208/230-3-60 (V-Ph-Hz) VOLTAGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONLY EXHAUST FAN ELECTRIC HEAT* BASE UNIT WITH EXHAUST FAN AND/OR ELECTRIC HEAT* RLA LRA RLA LRA Total FLA Hp FLA MCA MOCP Total Hp Total FLA kW FLA MCA MOCP 187-254 69.2 345.0 69.2 34...
Page 25 - Table 5 — Electrical Data, 054 Units
Table 5 — Electrical Data, 054 Units 208/230-3-60 (V-Ph-Hz) VOLTAGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONLY EXHAUST FAN ELECTRIC HEAT* BASE UNIT WITH EXHAUST FAN AND/OR ELECTRIC HEAT* RLA LRA RLA LRA Total FLA Hp FLA MCA MOCP Total Hp Total FLA kW FLA MCA MOCP 187-254 107.7 506.0 74.4 3...
Page 28 - Table 6 — Electrical Data, 064 Units
Table 6 — Electrical Data, 064 Units 208/230-3-60 (V-Ph-Hz) VOLTAGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONLY EXHAUST FAN ELECTRIC HEAT* BASE UNIT WITH EXHAUST FAN AND/OR ELECTRIC HEAT* RLA LRA RLA LRA Total FLA Hp FLA MCA MOCP Total Hp Total FLA kW FLA MCA MOCP 187-254 107.7 506.0 107.0 ...
Page 31 - Table 7 — Electrical Data, 074 Units
Table 7 — Electrical Data, 074 Units 208/230-3-60 (V-Ph-Hz) VOLTAGE RANGE COMPR NO. 1 COMPR NO. 2 OFM IFM BASE UNIT ONLY EXHAUST FAN ELECTRIC HEAT* BASE UNIT WITH EXHAUST FAN AND/OR ELECTRIC HEAT* RLA LRA RLA LRA Total FLA Hp FLA MCA MOCP Total Hp Total FLA kW FLA MCA MOCP 187-254 107.7 506.0 142.3 ...
Page 34 - NOTES AND LEGEND FOR FIG. 20; Fig. 19 — Field Control Thermostat Wiring
CONTROL WIRING — Install a Carrier-approved acces-sory 24-v thermostat assembly according to the installationinstructions shipped with the accessory. Locate thermostatassembly to sense average temperature. Route thermostat cableor equivalent leads of colored wire from subbase terminalsto terminal bo...
Page 35 - Fig. 20 — Field Wiring for Building Pressurization and Smoke Purge
034 AND 044 UNITS BASE UNIT OPTIONAL MODULATING POWER EXHAUST OPTIONAL NON-MODULATING EXHAUST 054-074 UNITS BASE UNIT BASE UNIT OPTIONAL MODULATING POWER EXHAUST OPTIONAL NON-MODULATING EXHAUST Fig. 20 — Field Wiring for Building Pressurization and Smoke Purge 35
Page 36 - Fig. 21 — Gas Piping Details
Gas Piping (48 Series Units Only) — Unit is equipped for use with natural gas only. Installation must conform withlocal building codes, or in the absence of local codes, withthe National Fuel Gas Code, ANSI Z223.1. A 1/8-in. NPT tapping plug, accessible for test gage con- nection, must be field inst...
Page 38 - Table 8 — Oil Charge; UNIT SIZE
PRE-START-UP Unit Preparation — Check to see that unit has been installed in accordance with these Installation Instructionsand all applicable codes. Compressor Mounting — Loosen compressor hold- down bolts until sidewise movement of the washer undereach holddown bolt head can be obtained. Do not lo...
Page 43 - All gas system components are in the gas section.; Fig. 35 — Modulating Power Exhaust Damper
LIQUID SERVICE VALVES, FILTER DRIERS, AND SIGHTGLASSES Sizes 034 and 044 — Access to these components is throughthe 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 charging unit, routeservice...
Page 44 - The electric heater control box contains:; Fig. 37 — Gas Section Detail, 48 Series 034 and; Fig. 40 — Flue Box Assembly, 48 Series Units Only
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 FILTER SECTIONon the sides of the unit. ELECTRIC HEATER CONTROL BOX (50 Series Units Only)— Access to the electric heater control box is through thedoor ...
Page 45 - Fig. 42 — Typical Electric Heat Control Box
NOTE: Only the heater element contactors are located in theheater box. The heaters are located in the unit airstream. 25% OUTDOOR-AIR DAMPER — Access to adjust thedamper is through the hoods. Remove filters to gain accessinto unit to adjust linkage arms. MODULATING POWER EXHAUST DAMPER MOTOR— The mo...
Page 46 - Adjustments; Fig. 44 — Motor Plate Adjustment
Adjustments EVAPORATOR FAN AND POWER EXHAUST MOTORPLATE — Adjust using a 15 ⁄ 16 -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 ...
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 acomplete operating charge of R-22. See unit nameplate andTables 1A and 1B for amount of charge. When adding a com-plete charge, evacuate system using sta...
Page 50 - Fig. 60 — Auxiliary Switch Stroke Adjustment
GAS VALVE ADJUSTMENT (48 Series Units Only) — Thegas valve opens and closes in response to the thermostat orlimit 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 o...
Page 51 - Fig. 61 — Auxiliary Switch Adjustment
Moisture/Liquid Indicator — A clear flow of liquid refrigerant indicates sufficient charge in the system. Bubblesindicate 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...
Page 52 - Table 11 — Pressure Switch Settings (psig); Control Circuit, 115 V —; Table 12 — Economizer Motor Checkout
Table 11 — Pressure Switch Settings (psig) SWITCH CUTOUT CUT-IN High 426 6 7 320 6 20 Low 27 6 4 67 6 7 Control Circuit, 115 V — This control circuit is pro- tected against overcurrent by a 5-amp circuit breaker. Breakercan be reset. If it trips, determine cause of trouble beforeresetting. Control C...
Page 53 - Unit Control Board Checkout —; Table 16 — Economizer Control Board Checkout,
Table 14 — Economizer Control Board Checkout, Test 2 MOTOR TEST PROCEDURE EXPECTED RESULT AND RESPONSE A Turn enthalpy set pointpotentiometer to theA 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- l...
Page 54 - — Plug; 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. 3. Turn unit power on and check if the indoor (evaporator) fan contactor (IFC) coil has been pulled in. If the ...
Page 56 - Fig. 65 — Compressor Lockout Connections
LEGEND CLO — Compressor LockoutP — Plug SC — Safety Circuit Fig. 65 — Compressor Lockout Connections 56
Page 70 - PACKAGED SERVICE TRAINING; equipment discussed in this manual. Product programs cover:
PACKAGED SERVICE 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 large selection of product, theo...