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York 20 Series User Manual
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349215-JIM-B-1008
Johnson Controls Unitary Produ
cts
33
FIGURE 16 - AL
TITUDE/TEMPERA
TUR
E CONVERSION F
ACTOR
32
34
Table of Contents
Table of Contents
2
General
4
Safety Considerations
4
Inspection
4
Reference
4
Renewal Parts
5
Approvals
5
Product Nomenclature
6
Installation
7
Installation Safety Information
7
Limitations
7
Location
8
Unit Application Data
8
Rigging and Handling
9
Clearances
9
Typical Rigging
9
Center of Gravity
9
Ductwork
10
Fixed Outdoor Air Intake Damper
10
Condensate Drain
11
Compressors
11
Filters
11
Service Access
11
Fixed Outdoor Air Damper
11
Recommended Drain Piping
11
Typical Field Wiring
12
Thermostat
13
Space Sensor
13
Power and Control Wiring
13
Optional Electric Heat
13
Control Wire Sizes
13
Optional Gas Heat
14
Gas Piping
14
Electric Heat Application Data
14
Gas Heat Application Data
14
Pipe Sizing
14
Gas Connection
15
L.p. Units, Tanks and Piping
16
Vent and Combustion Air Hoods
16
External Supply Connection External Shut-Off
16
Bottom Supply Connection External Shut-Off
16
Optional Economizer/Motorized Damper Rain Hood
17
Optional Power Exhaust/Barometric Relief
17
Damper Rain Hood
17
Optional Economizer and Power Exhaust Damper Set Point Adjustments and Information
17
Minimum Position Adjustment
17
Enthalpy Set Point Adjustment
17
Power Exhaust Damper Setpoint
17
Indoor Air Quality Aq
17
Vent and Combustion Air Hood
17
Optional Bas-Ready Economizer Power Exhaust Damper Set Point Adjustment
18
Optional Variable Air Volume (Vav)
18
Duct Static Pressure Transducer
18
Vav Control Board
18
Factory-Installed Vfd
19
Manual Bypass
19
Bas-Ready Vfd
20
Vfd-Ready' for Customer-Installation
20
Optional Hot Gas Bypass (Hgbp)
21
Enthalpy Setpoint Adjustment
21
Economizer Control (Excludes Vfd and Bas Options)
22
Four and Six Point Loads
22
Center of Gravity
23
Four and Six Point Loads
23
Physical Data
24
Supply Fan Vfd Weights, in Lbs
24
Dj Electrical Data Without Powered Convenience Outlet
25
Dj Electrical Data with Powered Conve- Nience Outlet
27
Front View Dimensions 15, 17.5, 20 & 25 Ton
29
Rear View Dimensions
30
Unit Clearances and Rain Hood Dimensions
31
Cfm, Static Pressure, and Power - Altitude and Temperature Corrections
32
Pg. # 11 ALTITUDE CORRECTION FACTORS
32
Factor
33
Supply Air Blower Performance (15 Ton) - Cooling Only 180 Mbh - Bottom Duct Connections
34
Supply Air Blower Performance (17.5 Ton) - Cooling Only 210 Mbh - Bottom Duct Connections
35
Supply Air Blower Performance (20 Ton) - Cooling Only 240 Mbh - Bottom Duct Connections
36
Supply Air Blower Performance (15 Ton) - Gas Heat180 Mbh - Bottom Duct Connections
37
Supply Air Blower Performance (17.5 Ton) - Gas Heat 210 Mbh - Bottom Duct Connections
38
Supply Air Blower Performance (20 Ton) - Gas Heat 240 Mbh - Bottom Duct Connections
39
Supply Air Blower Performance (25 Ton) - Gas Heat 300 Mbh - Bottom Duct Connections
40
Static Resistances
41
Power Exhaust Performance
41
Blower Motor and Drive Data
41
Charging Chart - 15 Ton
42
Charging Chart - 17.5 Ton
42
Charging Chart - 20 Ton
43
Charging Chart - 25 Ton
43
Phasing
44
Checking Supply Air Cfm
44
Air Balance
44
Belt Adjustment
44
Operation
45
Sequence of Operations Overview
45
Cooling Sequence of Operation
45
Continuous Blower
45
Intermittent Blower
45
Pressure Drop Across a Dry Indoor Coil Vs Supply Air Cfm for All Unit Tonnages
45
Optional Vav Blower Operation
46
No Outdoor Air Options
46
Economizer with Single Enthalpy Sensor
46
Economizer with Dual Enthalpy Sensors
46
Economizer (Single or Dual Enthalpy) with Power Exhaust
47
Economizer with Optional Vav Control
47
Economizer with Optional Vav Blower with Power Exhaust
47
Motorized Outdoor Air Dampers
47
Cooling Operation Errors
47
High-Pressure Limit Switch
48
Low-Pressure Limit Switch
48
Freezestat
48
Low Ambient Cooling
48
Safety Controls
48
Compressor Protection
49
Flash Codes
49
Reset
49
Electric Heating Sequence of Operations
49
Heating Operation Errors
49
Temperature Limit
49
Safety Controls
49
Flash Codes
50
Reset
50
Heat Anticipator Setpoints
50
Gas Heating Sequence of Operations
50
Limit Control Setting
50
Electric Heat Anticipator Setpoints
50
Gas Heating Operation Errors
51
Temperature Limit
51
Gas Valve
51
Gas Valve Piping
51
Safety Controls
52
Flash Codes
52
Resets
52
Gas Valve and Controls
52
Limit Control Setting
52
Heat Anticipator Setpoints
53
Start-Up (Cooling)
53
Prestart Check List
53
Operating Instructions
53
Post Start Check List
53
Shut down
53
Start-Up (Gas Heat)
53
Gas Heat Anticipator Setpoints
53
Operating Instructions
54
To Light Pilot and Main Burners
54
To Shut down
54
Post-Start Check List (Gas)
54
Typical Gas Valves
54
Manifold Gas Pressure Adjustment
55
Pilot Checkout
55
Burner Instructions
55
Burner Air Shutter Adjustment
55
Checking Gas Input
55
Natural Gas
55
Proper Flame Adjustment
55
Typical Flame Appearance
55
Adjustment of Temperature Rise
56
Belt Drive Blower
56
Troubleshooting
56
Cooling Troubleshooting Guide
56
Gas Rate - Cubic Feet Per Hour
56
Gas Heat Troubleshooting Guide
61
Unit Control Board Flash Codes
64
Unit Control Board Option Setup
65
Option Byte Setup
65
Heat Delay Setup
65
Unit Control Board
65
Optional Vav Control Board Flash Codes
66
Heat Delay
66
Vav Control Board Flash Codes
66
5
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York 20 Series Specifications
General
Brand
York
Model
20 Series
Category
Air Conditioner
Language
English
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