Unitary products group DW-20 Manuals

Manuals and User Guides for Unitary products group DW-20. We have 1 Unitary products group DW-20 manual available for free PDF download: Installation Manual

Unitary products group DW-20 Installation Manual (68 pages)

Gas/electric single package air conditioners

Brand: Unitary products group | Category: Air Conditioner | Size: 2 MB

Table of Contents
2
General
4
Safety Considerations
4
Inspection
4
Reference
4
Renewal Parts
5
Approvals
5
Product Nomenclature
6
PRODUCT NOMENCLATURE - Continued
7
Installation
17
Installation Safety Information
17
Limitations
17
Location
18
Rigging and Handling
19
Clearances
19
Center of Gravity
19
Ductwork
20
Fixed Outdoor Air Intake Damper
20
Condensate Drain
21
Compressors
21
Filters
21
Service Access
21
Fixed Outdoor Air Damper
21
Thermostat
23
Power and Control Wiring
23
Optional Electric Heat
23
Optional Gas Heat
24
Gas Piping
24
Gas Connection
24
Pipe Sizing
24
L.p. Units, Tanks and Piping
25
External Supply Connection External
25
Shut-Off
25
Bottom Supply Connection External
25
Vent and Combustion Air Hoods
26
Optional Economizer/Motorized Damper Rain
26
Hood
26
Optional Power Exhaust/Barometric Relief Damper and Rain Hood
26
Vent and Combustion Air Hood
26
Optional Economizer and Power Exhaust
27
Tion
27
Minimum Position Adjustment
27
Enthalpy Set Point Adjustment
27
Power Exhaust Damper Setpoint (with or With- out Power Exhaust)
27
Indoor Air Quality Aq
27
Enthalpy Setpoint Adjustment
28
Four and Six Point Loads
29
Center of Gravity
29
Physical Data
30
Dw Electrical Data Without Powered Convenience Outlet
31
Dw Electrical Data with Powered Convenience Outlet
33
Cfm, Static Pressure, and Power - Altitude and Temperature Corrections
37
Supply Air Blower Performance (15 Ton) - Cooling Only 180 Mbh - Bottom Duct
39
Supply Air Blower Performance (17.5 Ton) - Cooling Only 210 Mbh - Bottom Duct
40
Supply Air Blower Performance (20 Ton) - Cooling Only 240 Mbh - Bottom Duct
41
Supply Air Blower Performance (15 Ton) - Gas Heat 180 Mbh - Bottom Duct
42
Supply Air Blower Performance (17.5 Ton) - Gas Heat 210 Mbh - Bottom Duct
43
Supply Air Blower Performance (20 Ton) - Gas Heat 240 Mbh - Bottom Duct Connections
44
Supply Air Blower Performance (25 Ton) - Gas Heat 300 Mbh - Bottom Duct Connections
45
Connections
46
Static Resistances
46
Blower Motor and Drive Data
46
Charging Chart - 15 Ton
47
Charging Chart - 17.5 Ton
47
Charging Chart - 20 Ton
48
Charging Chart - 25 Ton
48
Phasing
49
Checking Supply Air Cfm
49
Air Balance
50
Operation
50
Sequence of Operations Overview
50
Pressure Drop Across a Dry Indoor Coil Vs Supply Air Cfm for All Unit Tonnages
50
Cooling Sequence of Operation
51
Continuous Blower
51
Intermittent Blower
51
No Outdoor Air Options
51
Economizer with Single Enthalpy Sensor
51
Economizer with Dual Enthalpy Sensors
51
Economizer (Single or Dual) with Power Exhaust
51
Motorized Outdoor Air Dampers
52
Cooling Operation Errors
52
High-Pressure Limit Switch
52
Low-Pressure Limit Switch
52
Freezestat
52
Low Ambient Cooling
52
Safety Controls
53
Compressor Protection
53
Flash Codes
53
Reset
53
Electric Heating Sequence of Operations
53
Heating Operation Errors
53
Temperature Limit
53
Saftey Controls
54
Flash Codes
54
Reset
54
Heat Anticipator Setpoints
54
Gas Heating Sequence of Operations
54
Limit Control Setting
54
Gas Heating Operation Errors
55
Temperature Limit
55
Gas Valve
56
Safety Controls
56
Limit Control Setting
56
Flash Codes
57
Resets
57
Heat Anticipator Setpoints
57
Start-Up (Cooling)
57
Prestart Check List
57
Operating Instructions
57
Post Start Check List
57
Shut down
58
Start-Up (Gas Heat)
58
Pre-Start Check List
58
Operating Instructions
58
To Light Pilot and Main Burners
58
To Shut down
58
Post-Start Check List (Gas)
58
Manifold Gas Pressure Adjustment
59
Pilot Checkout
59
Burner Instructions
59
Burner Air Shutter Adjustment
59
Checking Gas Input
60
Natural Gas
60
Adjustment of Temperature Rise
60
Belt Drive Blower
60
Troubleshooting
60
Cooling Troubleshooting Guide
60
Gas Heat Troubleshooting Guide
65
Unit Flash Codes
68
Unit Control Board Flash Codes
68

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