Installation Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS
INSTALLATION
Step 4 -Rigand Place Unit
Step 3 -InstallExternal Trap for Condensate Drain
Step 1 -ProvideUnit Support
Step 2 -FieldFabricate Ductwork
551C
551B,C
Fig. 2 --- Roof Curb Details
551B
Fig. 4 --- Condensate Drain Connection
551B,C
MAXIMUM ALLOWABLE DIFFERENCE in
Fig. 3 --- Unit Leveling Tolerances
Fig. 7 --- Roof Curb Alignment
551B,C
XOB LOR TNO C
551B 036-072Base Unit Dimensions
551B,C
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COMPRESSOR
Fig. 9 --- 551C 024-060Base Unit Dimensions
ACCESS
551B,C
Heat Anticipator Settings
Step 5 -MakeElectrical Connections
Field Power Supply
Field Control Wiring
Table 1-PhysicalData 551B
551B,C
Table 2-PhysicalData 551C
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Indoor Evaporator Fan Contactor
Fig. 11 --- Power Wiring Connections
Fig. 12 --- Field Control Wiring Raceway
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Table 3-Electrical Data-551C
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Table 3 - Electrical Data-551Ccont
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Table 3 - Electrical Data-551Ccont
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VOLTAGE
Table 3 - Electrical Data-551Ccont
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VOLTAGE
Table 3 - Electrical Data-551Ccont
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NONE
Table 4-Electrical Data-551B
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Table 4 - Electrical Data-551Bcont
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Table 4 - Electrical Data-551Bcont
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UNIT
Table 4 - Electrical Data-551Bcont
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UNIT
Table 4 - Electrical Data-551Bcont
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VOLTAGE
Assembly
Step 6 -Adjust Factory-InstalledOptions
Fig. 13 --- Accessory Field-InstalledHumidistat
Disconnect Switch
Factory Wiring
Humidistat Wiring 208/230-VUnit Shown
Damper Installed
LTLO - Low Temperature Lockout
Fig. Fig
Outdoor-AirDamper Position Setting
Fig. 22 --- Typical Access Panel Locations
551B,C
Table 5-SupplyAir Sensor Temperature
Fig. 24 --- Indoor Coil Access Panel Relocation
Outdoor Air Temperature OAT Sensor
Supply Air Temperature SAT Sensor
Outdoor Dry Bulb Changeover
Fig. 27 --- EconoMi$er IV Wiring
551B,C
EconoMi$er IV Control Modes
Fig. 28 --- Barometric Flow Capacity
551B,C
Outdoor Enthalpy Changeover
Differential Enthalphy Control
Indoor Air Quality IAQ Sensor Input
Exhaust Set Point Adjustment
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and LED Locations
Changeover Set Points
Fig. 34 --- Outside Air Temperature
Fig. 35 --- Return Air Temperature or Enthalpy
551B,C
Fig. 37 --- EconoMi$er IV Control
CO2 Sensor Configuration
Fig. 38 --- CO2 Sensor Maximum Range Setting
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Dehumidification of Fresh Air with DCV Control
Step 7 -Adjust Evaporator-FanSpeed
Table 7-CO2 Sensor Standard Settings
551B,C
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Fig. 41 --- Evaporator-FanPulley Adjustment
UNIT
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GENERAL FAN PERFORMANCE NOTES
Table 14 - Evaporator-FanMotor Efficiency
Belt Drive
Belt Drive
Belt Drive
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Belt Drive
AIRFLOW
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AIRFLOW
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Belt Drive
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AIRFLOW
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AIRFLOW
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Belt Drive
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Belt Drive
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Standard Motor Belt Drive
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Standard Motor Belt Drive
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High-StaticMotor Belt Drive
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AIRFLOW
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START-UP
Internal Wiring
Refrigerant Service Ports
PRE-START-UP
Ventilation Continuous Fan
Safety Relief
Cooling
Heating
Fig. 42 --- Perfect Humidityt Normal
SERVICE
Step 1 -Cleaning
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Step 2 -Lubrication
Fig. 45 --- Cleaning Condenser Coil
Evaporator Fan Belt Adjustment
Fig. 48 --- Condenser-FanAdjustment
Step 3 -Condenser-FanAdjustment
Step 4 -EconoMi$erIV Adjustment
Step 5 -RefrigerantCharge
Fig. 52 --- Cooling Charging Chart
Fig. 51 --- Cooling Charging Chart Standard 551B
Fig. 53 --- Cooling Charging Chart, 551B 036 with
Fig. 50 --- Cooling Charging Chart
Fig. 56 --- Cooling Charging Chart, 551B 072 with
Step 6 -ReplacementParts
Fig. 54 --- Cooling Charging Chart, 551B 048 with
Fig. 55 --- Cooling Charging Chart, 551B 048 with
551C - 2 TON CHARGING CHART
Fig. 57 --- Cooling Charging Chart Standard 551C
551C - 3 TON CHARGING CHART
Fig. 58 --- Cooling Charging Chart Standard 551C
Fig. 60 --- Cooling Charging Chart Standard 551C
551C - 5 TON CHARGING CHART
551C - 4 TON CHARGING CHART
Fig. 59 --- Cooling Charging Chart Standard 551C
551B,C
TROUBLESHOOTING
Unit Troubleshooting
Economi$er IV Troubleshooting
Table 35-CoolingService Analysis
EconoMi$er IV Troubleshooting Completion
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Table 38-EconoMi$erIV Input/Output Logic
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Fig. 61 --- EconoMi$er IV Functional View
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III. START-UP
GENERAL
START-UPCHECKLIST Remove and Store in Job File
I. PRELIMINARY INFORMATION
