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Fig. 48 — Pulley Alignment Fig. 49 — Condenser-Fan Adjustment (All Units Except Size 035) AIR PRESSURE TRANSDUCER FIELD ADJUST- MENT — All transducers have been factory calibrated and should not require field adjustment. If field adjustment is necessary, follow the instructions below. To re-calibrate a transducer: 1. Shut the unit power off. 2. Take the wiring and pressure tubing off the transducer. Take the transducer out of the unit. 3. Connect a 24-vdc power supply to transducer terminals EXC(+) and COM(–). See Fig. 51. 4. Using a digital multimeter measure the current between terminals EXC(+) and OUT. 142 5. With both pressure ports open to atmosphere adjust the Zero (Z) screw potentiometer on the transducer and read the multimeter until the desired current output at 0 in. wg pressure is obtained (see Fig. 51). 6. Reinstall the transducer in the unit. 7. Restore power to the unit. FAN ORIFICE Cleaning — Inspect unit at the beginning of each heating and cooling season and during each season as operating conditions may require. MICROCHANNEL HEAT EXCHANGER (MCHX) CON- DENSER COIL MAINTENANCE AND CLEANING RECOMMENDATIONS CAUTION PLASTIC FAN PROPELLER CLEARANCE OF 0.25 INCHES (6.4 MM) FOR STANDARD CONDENSER FANS FAN DECK SURFACE Fig. 50 — Condenser Fan Position (Size 035 Units) TRANSDUCER PART NUMBER INPUT RANGE (in. wg) OUTPUT RANGE OUTPUT AT 0 IN. WG HK05ZG019 0-5 4-20 mA 4 mA HK05ZG020 0-1 4-20 mA 4 mA HK05ZG021 0-15 4-20 mA 4 mA HK05ZG022 –0.25-0.25 4-20 mA 12 mA PRESSURE PORTS Fig. 51 — Transducer Details USAGE Supply Duct/ Air Foil Fan Cfm Forward Curved Fan Cfm Return/ Exhaust Fan Cfm Building Pressure HIGH LOW COM OUT EXC Do not apply any chemical cleaners to MCHX condenser coils. These cleaners can accelerate corrosion and damage the coil. S Z
Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will greatly increase the life of the coil and extend the life of the unit. The following steps should be taken to clean MCHX condenser coils: 1. Remove any foreign objects or debris attached to the core face or trapped within the mounting frame and brackets. 2. Put on personal protective equipment including safety glasses and/or face shield, waterproof clothing and gloves. It is recommended to use full coverage clothing. 3. Start high pressure water sprayer and purge any soap or industrial cleaners from sprayer before cleaning condenser coils. Only clean potable water is authorized for cleaning condenser coils. 4. Clean condenser face by spraying the core steady and uniformly from top to bottom while directing the spray straight toward the core. Do not exceed 900 psig or 30 degree angle. The nozzle must be at least 12 in. from the core face. Reduce pressure and use caution to prevent damage to air centers. CAUTION Excessive water pressure will fracture the braze between air centers and refrigerant tubes. CONDENSATE DRAIN — Check and clean each year at start of cooling season. In winter, keep drains and traps dry. FILTERS — Clean or replace at start of each heating and cooling season, or more often if operating conditions require. Refer to Installation Instructions for type and size. 1. Remove economizer outdoor-air filters from the hoods by removing the filter retainers. 2. Clean filters with steam or hot water and mild detergent. 3. Reinstall filters in hoods after cleaning. Never replace cleanable filters with throwaway filters. OUTDOOR-AIR INLET SCREENS — Clean screens with steam or hot water and a mild detergent. Do not use disposable filters in place of screens. Lubrication FAN SHAFT BEARINGS — Lubricate fan shaft bearings at least once a year with suitable bearing grease. Extended grease lines are provided on pulley side of blower. Typical lubricants are given below: MANUFACTURER LUBRICANT Texaco Regal AFB-2* Mobil Mobilplex EP No. 1 Sunoco Prestige 42 Texaco Multifak 2 *Preferred lubricant because it contains rust and oxidation inhibitors. FAN MOTOR BEARINGS — The condenser-fan and evaporator-fan motors have sealed bearings so no field lubrication is required. DOOR HINGES — All door hinges should be lubricated at least once a year. Refrigerant Feed Components — Each refrigerant circuit (2 per unit) has all the necessary refrigerant controls. Thermostatic Expansion Valve (TXV) — On sizes 030 and 035, each circuit has one TXV. On sizes 040-100, each circuit has 2 TXVs on which superheat may be adjusted if necessary. Adjustment is not normally required or recommended. The TXV is set to maintain 10 to 13 F superheat leaving the evaporator coil. It controls the flow of refrigerant to the evaporator coils. 143 Refrigeration Circuits LEAK TESTING — Units are shipped with a full operating charge of R-410A (see unit nameplate). If there is no pressure in the system, introduce enough nitrogen to search for the leak. Repair the leak using good refrigeration practices. After leaks are repaired, system must be evacuated and dehydrated using methods described in GTAC II, Module 4, System Dehydration. REFRIGERANT CHARGE — Amount of refrigerant charge is listed on unit nameplate. Refer to Carrier GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure. NOTE: Do not use recycled refrigerant as it may contain contaminants. NO CHARGE — Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant from the unit nameplate. LOW CHARGE COOLING — Due to the compact, all aluminum design, microchannel heat exchangers will reduce refrigerant charge and overall operating weight. As a result, charging procedures for MCHX units require more accurate measurement techniques. Charge should be added in small increments. Using cooling charging charts provided (Fig. 52- 89), add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in 1 / 4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts. To Use the Cooling Charging Chart — Use the outdoor air temperature, saturated suction temperature and saturated condensing temperature (available on the ComfortLink display), and find the intersection point on the cooling charging chart. If intersection point is above the line, carefully recover some of the refrigerant. If intersection point is below the line, carefully add refrigerant. NOTE: Indoor-air cfm must be within normal operating range of unit. In order to determine which charging chart to use, the technician can verify the evaporator configuration of the unit (High Cap or Std Cap) by counting the number of rows on the installed evaporator. Use Table 103 to identify the correct unit configuration for refrigerant charging. Units With Humidi-MiZer® Adaptive Dehumidification System NOTE: All circuits must be running in normal cooling mode. Indoor airflow must be within specified air quantity limits for cooling. All outdoor fans must be on and running at normal speed. Table 103 — Unit Capacity Type UNIT SIZE NUMBER OF ROWS ON EVAPORATOR 48/50P High Capacity Std Capacity 030 4 3 035 N/A 4 040 6 3 050 6 4 055 6 4 060 6 4 070 6 4 075 6 4 090 6 4 100 6 4
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Controls, Start-Up, Operation, Serv
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WARNING What to do if you smell gas
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and the ENTER keys until the desire
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START-UP IMPORTANT: Do not attempt
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Table 4 — Fan Performance — 48P
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AIRFLOW (cfm) Table 10 — Fan Perf
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AIRFLOW (Cfm) LEGEND Table 18 — F
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AIRFLOW (cfm) LEGEND Bhp — Brake
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HIGH-EFFICIENCY MOTORS Nominal Maxi
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2. Under the Setpoints menu, set th
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would use Period 2 and set days Sat
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there is a loss of communication be
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and when ON, the control sets a cap
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System Mode Test — When the syste
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Table 31 — Unit Configuration ITE
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SETTING UP THE SYSTEM Machine Contr
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High SST Alert Delay Time (H.SST)
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Table 36 — Cool/Heat Set Point Of
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Table 38 — Run Status Cool Displa
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To use Demand Limiting, select the
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Size 050, 055, 060 Contactor OFM(s)
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Whenever the outdoor ambient temper
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Demand Level Low Heat Off Offset (L
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Limit Switch Low Temp (SW.L.T) —
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STAGE Table 49 — IGC LED Indicato
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Table 50 — Static Pressure Contro
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Table 53 — Dirty Filter Switch Po
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NOTE: If the user wishes to disable
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the economizer modulates when attem
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P = K * BP.P * (error) I = K * BP.I
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its smoke. Closing the economizer (
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Table 57 — Indoor Air Quality Con
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Table 58 — Humidity Configuration
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The default sensor is the return ai
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TEMPERATURE COMPENSATED START LOGIC
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Sensor Trim Configuration — The T
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SUPPLY FAN VFD CONFIGURATION — Th
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REMOTE SWITCH LOGIC CONFIGURATION (
Page 91 and 92: Alarms and Alarm History for for an
Page 93 and 94: Transducer Troubleshooting — The
Page 95 and 96: Table 75 — 10K Thermistor vs Resi
Page 97 and 98: TEMP RESISTANCE (F) (Ohms) -25 98,0
Page 99 and 100: PRESSURE (PSIG) Table 80 — Suctio
Page 101 and 102: Table 81 — Discharge Pressure Tra
Page 103 and 104: Table 82 — Auto View of Run Statu
Page 105 and 106: Table 84 — Cooling Information Di
Page 107 and 108: equalize compressor oil levels. If
Page 109 and 110: Table 91 — Alert and Alarm Codes
Page 111 and 112: T072 (Evaporator Discharge Reset Se
Page 113 and 114: This alarm will disable mechanical
Page 115 and 116: This is the reverse of the Pressuri
Page 117 and 118: 117 a48-8408 Fig. 19 — Typical Po
Page 119 and 120: OD ENTHALPY SWITCH LOW REMOTE OCCUP
Page 121 and 122: Fig. 23 — Typical Electric Heat U
Page 123 and 124: 123 Fig. 25 — Typical Gas Heat Se
Page 125 and 126: 125 Fig. 27 — Component Arrangeme
Page 127 and 128: ACCSY — Accessory ACC’Y — Acc
Page 129 and 130: Table 93 — Rooftop Control Board
Page 131 and 132: Table 96 — Control Expansion Modu
Page 133 and 134: LEGEND IAQ — Indoor Air Quality V
Page 135 and 136: the motor position to be configured
Page 137 and 138: TIME EWT LWT SETP Run Status Servic
Page 139 and 140: Fig. 37 — Door Latch Fig. 38 —
Page 141: SUPPLY FAN AND POWER EXHAUST MOTOR
Page 145 and 146: Saturated Discharge Temperature (de
Page 163 and 164: Gas System Adjustment (48P Only) GA
Page 165 and 166: APPENDIX A — LOCAL DISPLAY TABLES
Page 177 and 178: APPENDIX B — CCN TABLES (cont) ST
Page 179 and 180: APPENDIX B — CCN TABLES (cont) ST
Page 181 and 182: APPENDIX B — CCN TABLES (cont) SE
Page 187 and 188: APPENDIX B — CCN TABLES (cont) MA
Page 189 and 190: APPENDIX B — CCN TABLES (cont) MA
Page 191 and 192: TESTACTC TESTCOOL TESTFANS TESTHEAT
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APPENDIX C — UNIT STAGING TABLES
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* 41 for Supply Fan Motor VFD, 42 f
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Fig. B — VFD Keypad START UP WITH
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Upload All Parameters — To upload
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To replace the main fan for frame s
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ALARM CODE ALARM NAME IN PANEL 2001
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APPENDIX E — MODE SELECTION PROCE
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CONTROLS SET POINT AND CONFIGURATIO
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Controls, Start-Up, Operation, Service and ... - Climayoreo

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