SAFETY CONSIDERATIONS
TABLE OF CONTENTS
INSTALLATION
Installation Instructions
Step 1 -ProvideUnit Support
Step 3 -InstallExternal Trap for Condensate Drain
Step 2 -FieldFabricate Ductwork
Step 4 -Rigand Place Unit
Fig. 2 --- Roof Curb Details
551B,C
551B
551C
MAXIMUM ALLOWABLE DIFFERENCE in
551B,C
Fig. 3 --- Unit Leveling Tolerances
Fig. 4 --- Condensate Drain Connection
Fig. 7 --- Roof Curb Alignment
551B,C
551B,C
551B 036-072Base Unit Dimensions
C06375
XOB LOR TNO C
ACCESS
Fig. 9 --- 551C 024-060Base Unit Dimensions
551B,C
COMPRESSOR
Field Power Supply
Step 5 -MakeElectrical Connections
Field Control Wiring
Heat Anticipator Settings
Table 1-PhysicalData 551B
551B,C
Table 2-PhysicalData 551C
551B,C
Fig. 12 --- Field Control Wiring Raceway
Fig. 11 --- Power Wiring Connections
551B,C
Indoor Evaporator Fan Contactor
Table 3-Electrical Data-551C
551B,C
Table 3 - Electrical Data-551Ccont
551B,C
Table 3 - Electrical Data-551Ccont
551B,C
VOLTAGE
Table 3 - Electrical Data-551Ccont
551B,C
VOLTAGE
Table 3 - Electrical Data-551Ccont
551B,C
NONE
Table 4-Electrical Data-551B
551B,C
Table 4 - Electrical Data-551Bcont
551B,C
Table 4 - Electrical Data-551Bcont
551B,C
UNIT
Table 4 - Electrical Data-551Bcont
551B,C
UNIT
Table 4 - Electrical Data-551Bcont
551B,C
VOLTAGE
Fig. 13 --- Accessory Field-InstalledHumidistat
Step 6 -Adjust Factory-InstalledOptions
Disconnect Switch
Assembly
Damper Installed
Humidistat Wiring 208/230-VUnit Shown
LTLO - Low Temperature Lockout
Factory Wiring
Fig. 22 --- Typical Access Panel Locations
Outdoor-AirDamper Position Setting
551B,C
Fig. Fig
Outdoor Air Temperature OAT Sensor
Fig. 24 --- Indoor Coil Access Panel Relocation
Supply Air Temperature SAT Sensor
Table 5-SupplyAir Sensor Temperature
551B,C
Fig. 27 --- EconoMi$er IV Wiring
EconoMi$er IV Control Modes
Outdoor Dry Bulb Changeover
Outdoor Enthalpy Changeover
551B,C
Differential Enthalphy Control
Fig. 28 --- Barometric Flow Capacity
551B,C
Exhaust Set Point Adjustment
and LED Locations
Indoor Air Quality IAQ Sensor Input
Fig. 35 --- Return Air Temperature or Enthalpy
Fig. 34 --- Outside Air Temperature
551B,C
Changeover Set Points
Fig. 38 --- CO2 Sensor Maximum Range Setting
CO2 Sensor Configuration
551B,C
Fig. 37 --- EconoMi$er IV Control
Table 7-CO2 Sensor Standard Settings
Step 7 -Adjust Evaporator-FanSpeed
551B,C
Dehumidification of Fresh Air with DCV Control
551B,C
Fig. 41 --- Evaporator-FanPulley Adjustment
UNIT
551B,C
551B,C
GENERAL FAN PERFORMANCE NOTES
Table 14 - Evaporator-FanMotor Efficiency
Belt Drive
Belt Drive
Belt Drive
551B,C
Belt Drive
AIRFLOW
551B,C
AIRFLOW
551B,C
Belt Drive
551B,C
AIRFLOW
551B,C
AIRFLOW
551B,C
Belt Drive
551B,C
Belt Drive
551B,C
Standard Motor Belt Drive
551B,C
Standard Motor Belt Drive
551B,C
High-StaticMotor Belt Drive
551B,C
AIRFLOW
551B,C
Refrigerant Service Ports
Internal Wiring
PRE-START-UP
START-UP
Cooling
Safety Relief
Heating
Ventilation Continuous Fan
Step 1 -Cleaning
SERVICE
551B,C
Fig. 42 --- Perfect Humidityt Normal
Fig. 45 --- Cleaning Condenser Coil
Step 2 -Lubrication
Evaporator Fan Belt Adjustment
551B,C
Step 4 -EconoMi$erIV Adjustment
Step 3 -Condenser-FanAdjustment
Step 5 -RefrigerantCharge
Fig. 48 --- Condenser-FanAdjustment
Fig. 53 --- Cooling Charging Chart, 551B 036 with
Fig. 51 --- Cooling Charging Chart Standard 551B
Fig. 50 --- Cooling Charging Chart
Fig. 52 --- Cooling Charging Chart
Fig. 54 --- Cooling Charging Chart, 551B 048 with
Step 6 -ReplacementParts
Fig. 55 --- Cooling Charging Chart, 551B 048 with
Fig. 56 --- Cooling Charging Chart, 551B 072 with
551C - 3 TON CHARGING CHART
Fig. 57 --- Cooling Charging Chart Standard 551C
Fig. 58 --- Cooling Charging Chart Standard 551C
551C - 2 TON CHARGING CHART
551C - 4 TON CHARGING CHART
551C - 5 TON CHARGING CHART
Fig. 59 --- Cooling Charging Chart Standard 551C
Fig. 60 --- Cooling Charging Chart Standard 551C
Unit Troubleshooting
TROUBLESHOOTING
Economi$er IV Troubleshooting
551B,C
Table 35-CoolingService Analysis
EconoMi$er IV Troubleshooting Completion
551B,C
Table 38-EconoMi$erIV Input/Output Logic
551B,C
Fig. 61 --- EconoMi$er IV Functional View
551B,C
C06053
START-UPCHECKLIST Remove and Store in Job File
GENERAL
I. PRELIMINARY INFORMATION
III. START-UP