York 20 Series - Page 68

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Subject to change without notice. Printed in U.S.A. 349215-JIM-B-1008

Johnson Controls Unitary Products

5005 York Drive

Norman, OK 73069

Main Page

Table of Contents2
General4
Safety Considerations4
Inspection4
Reference4
Renewal Parts5
Approvals5
Product Nomenclature6
Installation7
Installation Safety Information7
Limitations7
Location8
Unit Application Data8
Rigging and Handling9
Clearances9
Typical Rigging9
Center of Gravity9
Ductwork10
Fixed Outdoor Air Intake Damper10
Condensate Drain11
Compressors11
Filters11
Service Access11
Fixed Outdoor Air Damper11
Recommended Drain Piping11
Typical Field Wiring12
Thermostat13
Space Sensor13
Power and Control Wiring13
Optional Electric Heat13
Control Wire Sizes13
Optional Gas Heat14
Gas Piping14
Electric Heat Application Data14
Gas Heat Application Data14
Pipe Sizing14
Gas Connection15
L.p. Units, Tanks and Piping16
Vent and Combustion Air Hoods16
External Supply Connection External Shut-Off16
Bottom Supply Connection External Shut-Off16
Optional Economizer/Motorized Damper Rain Hood17
Optional Power Exhaust/Barometric Relief17
Damper Rain Hood17
Optional Economizer and Power Exhaust Damper Set Point Adjustments and Information17
Minimum Position Adjustment17
Enthalpy Set Point Adjustment17
Power Exhaust Damper Setpoint17
Indoor Air Quality Aq17
Vent and Combustion Air Hood17
Optional Bas-Ready Economizer Power Exhaust Damper Set Point Adjustment18
Optional Variable Air Volume (Vav)18
Duct Static Pressure Transducer18
Vav Control Board18
Factory-Installed Vfd19
Manual Bypass19
Bas-Ready Vfd20
Vfd-Ready' for Customer-Installation20
Optional Hot Gas Bypass (Hgbp)21
Enthalpy Setpoint Adjustment21
Economizer Control (Excludes Vfd and Bas Options)22
Four and Six Point Loads22
Center of Gravity23
Four and Six Point Loads23
Physical Data24
Supply Fan Vfd Weights, in Lbs24
Dj Electrical Data Without Powered Convenience Outlet25
Dj Electrical Data with Powered Conve- Nience Outlet27
Front View Dimensions 15, 17.5, 20 & 25 Ton29
Rear View Dimensions30
Unit Clearances and Rain Hood Dimensions31
Cfm, Static Pressure, and Power - Altitude and Temperature Corrections32
Pg. # 11 ALTITUDE CORRECTION FACTORS32
Factor33
Supply Air Blower Performance (15 Ton) - Cooling Only 180 Mbh - Bottom Duct Connections34
Supply Air Blower Performance (17.5 Ton) - Cooling Only 210 Mbh - Bottom Duct Connections35
Supply Air Blower Performance (20 Ton) - Cooling Only 240 Mbh - Bottom Duct Connections36
Supply Air Blower Performance (15 Ton) - Gas Heat180 Mbh - Bottom Duct Connections37
Supply Air Blower Performance (17.5 Ton) - Gas Heat 210 Mbh - Bottom Duct Connections38
Supply Air Blower Performance (20 Ton) - Gas Heat 240 Mbh - Bottom Duct Connections39
Supply Air Blower Performance (25 Ton) - Gas Heat 300 Mbh - Bottom Duct Connections40
Static Resistances41
Power Exhaust Performance41
Blower Motor and Drive Data41
Charging Chart - 15 Ton42
Charging Chart - 17.5 Ton42
Charging Chart - 20 Ton43
Charging Chart - 25 Ton43
Phasing44
Checking Supply Air Cfm44
Air Balance44
Belt Adjustment44
Operation45
Sequence of Operations Overview45
Cooling Sequence of Operation45
Continuous Blower45
Intermittent Blower45
Pressure Drop Across a Dry Indoor Coil Vs Supply Air Cfm for All Unit Tonnages45
Optional Vav Blower Operation46
No Outdoor Air Options46
Economizer with Single Enthalpy Sensor46
Economizer with Dual Enthalpy Sensors46
Economizer (Single or Dual Enthalpy) with Power Exhaust47
Economizer with Optional Vav Control47
Economizer with Optional Vav Blower with Power Exhaust47
Motorized Outdoor Air Dampers47
Cooling Operation Errors47
High-Pressure Limit Switch48
Low-Pressure Limit Switch48
Freezestat48
Low Ambient Cooling48
Safety Controls48
Compressor Protection49
Flash Codes49
Reset49
Electric Heating Sequence of Operations49
Heating Operation Errors49
Temperature Limit49
Safety Controls49
Flash Codes50
Reset50
Heat Anticipator Setpoints50
Gas Heating Sequence of Operations50
Limit Control Setting50
Electric Heat Anticipator Setpoints50
Gas Heating Operation Errors51
Temperature Limit51
Gas Valve51
Gas Valve Piping51
Safety Controls52
Flash Codes52
Resets52
Gas Valve and Controls52
Limit Control Setting52
Heat Anticipator Setpoints53
Start-Up (Cooling)53
Prestart Check List53
Operating Instructions53
Post Start Check List53
Shut down53
Start-Up (Gas Heat)53
Gas Heat Anticipator Setpoints53
Operating Instructions54
To Light Pilot and Main Burners54
To Shut down54
Post-Start Check List (Gas)54
Typical Gas Valves54
Manifold Gas Pressure Adjustment55
Pilot Checkout55
Burner Instructions55
Burner Air Shutter Adjustment55
Checking Gas Input55
Natural Gas55
Proper Flame Adjustment55
Typical Flame Appearance55
Adjustment of Temperature Rise56
Belt Drive Blower56
Troubleshooting56
Cooling Troubleshooting Guide56
Gas Rate - Cubic Feet Per Hour56
Gas Heat Troubleshooting Guide61
Unit Control Board Flash Codes64
Unit Control Board Option Setup65
Option Byte Setup65
Heat Delay Setup65
Unit Control Board65
Optional Vav Control Board Flash Codes66
Heat Delay66
Vav Control Board Flash Codes66

York 20 Series - Page 68

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