TABLE OF CONTENTS
SECTION 1: Air Handler Safety..............................................1
1.1 Description of Operation...............................................1
1.2 Inspection and Setup ................................................... 1
1.3 Safety Labels and Their Placement .............................2
1.4 California Proposition 65 .............................................. 2
SECTION 2: Installer Responsibility ..................................... 3
2.1 Wall Tag ....................................................................... 3
2.2 Corrosive Chemicals.................................................... 3
2.3 National Standards and Applicable Codes .................. 4
2.4 Required Equipment .................................................... 4
SECTION 3: Critical Considerations ..................................... 5
3.1 Required Clearances to Combustibles......................... 5
3.2 Purge of Supply Duct ................................................... 6
3.3 Hardware ..................................................................... 6
SECTION 4: National Standards and Applicable Codes ..... 7
4.1 Gas Codes................................................................... 7
4.2 Installation Codes ........................................................7
4.3 Aircraft Hangars ........................................................... 7
4.4 Parking Structures and Repair Garages ...................... 7
4.5 Electrical ...................................................................... 7
4.6 Venting......................................................................... 7
4.7 High Altitude ................................................................ 7
SECTION 5: Specifications .................................................... 8
SECTION 6: Liftingan Air Handler ...................................... 10
6.1 Lifting an Air Handler ................................................. 10
SECTION 7: Roof Curb ......................................................... 12
7.1 Roof Curb Assembly and Installation ........................ 12
7.2 Air Handler Mounting to Roof Curb ........................... 14
SECTION 8: Legs For Horizontal Mounting........................ 15
8.1 Leg Mounting............................................................. 15
8.2 Leg Mounting - Horizontal Air Handler....................... 15
SECTION 9: Upright Installation .......................................... 16
9.1 Upright Leg Assembly................................................ 16
9.2 Upright Installation ..................................................... 16
9.3 Attaching Air Handler................................................. 16
SECTION 10: Filter Section .................................................. 21
10.1 Filter Section Support Assembly Installation (XT-115 -
XT-130).................................................................................... 21
10.2 Filter Section Installation - Horizontal Air Handlers .. 22
10.3 Filter Section Installation - Upright Air Handlers.......22
SECTION 11: Inlet Hood ....................................................... 23
11.1 Inlet Hood Assembly................................................. 23
SECTION 12: Dampers ........................................................ 30
12.1 Discharge Damper .................................................. 31
12.2 Inlet Damper ........................................................... 31
SECTION 13: Discharge Heads and Splash Plates............32
13.1 Three-Way Discharge Head Installation .................. 32
13.2 Splash Plate Installation........................................... 33
SECTION 14: Duct Considerations...................................... 35
14.1 Inlet Duct Work ........................................................ 35
14.2 Return Duct Work .................................................... 35
14.3 Discharge Duct Work ............................................... 35
SECTION 15: Gas Piping...................................................... 36
15.1 Gas Manifolds .......................................................... 36
15.2 Gas Piping and Pressures ....................................... 36
15.3 Gas Manifold Venting............................................... 36
15.4 Gas Piping ............................................................... 39
15.5 Pressure Test Ports .................................................. 39
15.6 Line Pressure Test - Leak Testing ............................39
SECTION 16: Electrical ......................................................... 40
16.1 Disconnect Fuse Sizing .......................................... 41
16.2 Wiring and Electrical Connections ........................... 41
16.3 Remote Panel .......................................................... 41
16.4 Motor Current Draw................................................. 41
16.5 Control Current Draw............................................... 42
16.6 Safety Systems........................................................ 42
16.7 Interlocks ................................................................. 45
16.8 Control Options........................................................ 45
SECTION 17: Sequence of Operation ................................. 47
17.1 Air Handler Configuration ......................................... 47
17.2 HVAC Remote Panels and Panel Options ................ 49
17.3 Basic Air Handler Sequence of Operation................ 51
SECTION 18: Direct Fired Burner ........................................ 55
18.1 Direct Fired Burner Ignition...................................... 56
18.2 Direct Fired Burner Flame Proving (Flame Rod)...... 57
SECTION 19: Direct fired process air heaters .................... 58
19.1 Direct Fired Process Air Heater Models................... 59
19.2 Installer's Responsibilities........................................ 59
19.3 Installer's Responsibility for Process Heaters Connected
to Paint Booths ....................................................................... 60
SECTION 20: Start-up Procedures ...................................... 61
20.1 Installation of Recirculating Air Handler................... 62
20.2 Mechanical .............................................................. 62
20.3 Electrical.................................................................. 63
20.4 Airflow...................................................................... 63
20.5 Gas Piping and Initial Pressure Settings.................. 64
20.6 Safety Shut Off Valve Check.................................... 66
20.7 Temperature Control System Calibration ................. 66
SECTION 21: Maintenance................................................... 69
21.1 General .................................................................... 70
21.2 Unit Exterior ............................................................. 70
21.3 Blower Section ........................................................ 70
21.4 Manifold and Controls .............................................. 73
21.5 Burner ..................................................................... 73
21.6 Optional Equipment ..................................................74
SECTION 22: Replacement Parts ........................................ 75
SECTION 23: Troubleshooting............................................ 79
23.1 Initial Checks ........................................................... 80
23.2 Motor and Blower ................................................... 80
23.3 Burner..................................................................... 81
23.4 Temperature Controls ............................................. 82
23.5 A1014 Amplifier - Field Checklist ............................ 83
23.6 A44 Amplifier - Field Service Checklist................... 85
SECTION 24: WEATHER-RITE™XT-Series Start-Up Proce-
dures...................................................................................... 87
SECTION 25: The WEATHER-RITE™XT-Series Warranty .. 89
