Pace PAI Guide

PAI/PAO
Indoor and Outdoor
Air Handling Units
Installation and Assembly Manual
Form PA102.20-N1 (718) │ Supersedes: PA102.20-N1 (1017)
LD22601

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 2Form PA102.20-N1
This equipment is a relatively complicated apparatus.
During rigging, installation, operation, maintenance, or
service, individuals may be exposed to certain compo-
nents or conditions including, but not limited to: heavy
objects, refrigerants, materials under pressure, rotat-
ing components, and both high and low voltage. Each
of these items has the potential, if misused or handled
improperly, to cause bodily injury or death. It is the ob-
ligation and responsibility of rigging, installation, and
operating/service personnel to identify and recognize
these inherent hazards, protect themselves, and pro-
ceed safely in completing their tasks. Failure to comply
with any of these requirements could result in serious
damage to the equipment and the property in which it
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
is situated, as well as severe personal injury or death
to themselves and people at the site.
This document is intended for use by owner-authorized
rigging, installation, and operating/service personnel. It
is expected that these individuals possess independent
training that will enable them to perform their assigned
tasks properly and safely. It is essential that, prior to
performing any task on this equipment, this individual
shall have read and understood the on-prooduct labels,
this document, and any referenced materials. This in-
dividual shall also be familiar with and comply with all
applicable industry and governmental standards and
regulations pertaining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to specific situations:
Indicates a possible hazardous situa-
tion which will result in death or serious
injury if proper care is not taken.
Indicates a potentially hazardous situa-
tion which will result in possible injuries
or damage to equipment if proper care
is not taken.
Identies a hazard which could lead
to damage to the machine, damage to
other equipment and/or environmental
pollution if proper care is not taken or
instructions and are not followed.
Highlights additional information useful
to the technician in completing the work
being performed properly.
External wiring, unless specied as an optional connection in the manufacturer’s product line,
is not to be connected inside the control cabinet. Devices such as relays, switches, transduc-
ers and controls and any external wiring must not be installed inside the micro panel. All wir-
ing must be in accordance with PACE's published specications and must be performed only
by a qualied electrician. PACE will NOT be responsible for damage/problems resulting from
improper connections to the controls or application of improper control signals. Failure to fol-
low this warning will void the manufacturer’s warranty and cause serious damage to property
or personal injury.

Form PA102.20-N1 3
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
MANUAL DESCRIPTION FORM NUMBER
PACE Air Handling Units Operation and Maintenance PA102.20-OM2
Steps to Protect New Equipment Warranty PA102.20-CL1
Air Handling Units Start-up Checklist PA100.00-CL1
Long-Term Storage Requirement - Field Preparation - Air Handling Units PA50.20-NM3
Long-Term Storage Periodic Checklist and Logs - Air Handling Units PA50.20-CL3
Limited Warranty PA50.05-NM2
CHANGEABILITY OF THIS DOCUMENT
In complying with PACE's policy for continuous product
improvement, the information contained in this docu-
ment is subject to change without notice. PACE makes
no commitment to update or provide current informa-
tion automatically to the manual or product owner. Up-
dated manuals, if applicable, can be obtained by con-
tacting the nearest PACE sales representative.
It is the responsibility of rigging, installation, and operat-
ing/service personnel to verify the applicability of these
documents to the equipment. If there is any question
regarding the applicability of these documents, rig-
ging, lifting, and operating/service personnel should
verify whether the equipment has been modified and
if current literature is available from the owner of the
equipment prior to performing any work on the unit.
CHANGE BARS
Revisions made to this document are indicated with a
line along the left or right hand column in the area the
revision was made. These revisions are to technical in-
formation and any other changes in spelling, grammar
or formatting are not included.
ASSOCIATED LITERATURE

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 4Form PA102.20-N1
MODEL NOMENCLATURE
PA
PRIMARY IDENTIFIER
PA
ENVIRONMENT
I=Indoor
O=Outdoor
I
NOMINAL
HEIGHT
27 to 132
NOMINAL
WIDTH
27 to 288
075
048 xD
SUPPLY AND RETURN/EXHAUST FAN OPTIONS
A=None
B=DWDI FC Fan without Motor Controller
C=DWDI FC Fan with Service Disconnect Only
D=DWDI FC Fan with Motor Starter
E=DWDI FC Fan with Variable Frequency Drive (VFD)
F=DWDI AF Fan without Motor Controller
G=DWDI AF Fan with Service Disconnect Only
H=DWDI AF Fan with Motor Starter
J=DWDI AF Fan with VFD
K=SWSI PL Fan without Motor Controller
L=SWSI PL Fan with Service Disconnect only
M=SWSI PL Fan with Motor Starter
N=SWSI PL Fan with VFD
P=SWSI PL Fan Direct Drive without Motor Controller
Q=SWSI PL Fan Direct Drive with Service Disconnect Only
R=SWSI PL Fan Direct Drivee with Motor Starter
S=SWSI PL Fan Direct Drive with VFD
C
FACTORY MOUNTED
END DEVICES
0=No
1=Yes
046
M
MOTOR HORSEPOWER
SUPPLY AND RETURN/EXHAUST
FAN
A=0
B=1/2
C=3/4
D=1
E=1 1/2
F=2
G=3
H=5
J=7 1/2
K=10
L=15
M=20
N=25
P=60
Q=40
R=50
S=60
T=75
U=100
V=125
K
VOLTAGE CODE
12=120-1-60
17=200 or 208-3-60
27=277-1-60
28=230 or 240-3-60
40=360-3-60
44=440-3-50
46=460-3-60
50=380 or 415-3-50
58=575-3-60
63=220-3-50
A
DESIGN
A=Original Unit Design
Note: The terms skid and section have the same meaning in this document;
Variable Speed Drive (VSD) and Variable Frequency Drive (VFD) do as well.

Form PA102.20-N1 5
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
TABLE OF CONTENTS
SECTION 1 - GENERAL INFORMATION AND SAFETY.......................................................................................13
Introduction.....................................................................................................................................................13
Warranty.........................................................................................................................................................13
Responsibility for Safety.................................................................................................................................13
SECTION 2 - PRODUCT DESCRIPTION...............................................................................................................15
Typical Operation ...........................................................................................................................................15
Ventilation System.................................................................................................................................15
Economizer System (Typical)................................................................................................................15
Heating and Cooling System..........................................................................................................................16
Cleaning .........................................................................................................................................................16
Hand Orientation ............................................................................................................................................16
AHU Identification (ID)....................................................................................................................................16
AHU ID Label ........................................................................................................................................17
Skid ID Label.........................................................................................................................................17
Segment ID Box ....................................................................................................................................17
Shipped Loose Parts.............................................................................................................................18
Direction of Airflow..........................................................................................................................................18
SECTION 3 - HANDLING, STORAGE, AND INSTALLATION ...............................................................................19
Delivery and Storage......................................................................................................................................19
Short Term.............................................................................................................................................19
Long Term .............................................................................................................................................20
Inspection, Damage, and Shortage ...............................................................................................................20
Check Doors and Latches.....................................................................................................................21
Indoor AHUs..........................................................................................................................................21
Outdoor AHUs .......................................................................................................................................21
Shipped Loose Parts.............................................................................................................................21
Lifting Weights................................................................................................................................................21
Moving the AHU .............................................................................................................................................21
Rigging ...........................................................................................................................................................21
Using Fork Lift in Special Circumstances.......................................................................................................22
Come-A-Longs (Power Pulls).........................................................................................................................22
Proper Lifting with Shackles ..........................................................................................................................22
Preparing the Site...........................................................................................................................................23
Clearance for Outdoor AHUs.................................................................................................................23
Assembling the PACE Provided Curb ...................................................................................................24
Clearance and Mounting for Indoor AHUs.............................................................................................26
Installing Ceiling Suspended AHUs.......................................................................................................27
Tools Required to Install AHU.........................................................................................................................28
Installing Outdoor AHU...................................................................................................................................28
Single Piece Outdoor AHU....................................................................................................................28
Multi-Piece Outdoor AHU ......................................................................................................................29
Setting Up the Sections ........................................................................................................................31
Pulling the AHU Sections Together .......................................................................................................32
Installing Hood with Moisture Eliminators..............................................................................................33
Outdoor Air Temperature and/or Humidity Sensors............................................................................... 33
Installing Indoor AHU......................................................................................................................................34
Installing an AHU with Expanded Cabinet ............................................................................................35

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 6Form PA102.20-N1
TABLE OF CONTENTS (CONT'D)
Setting Up and Pulling AHU Sections Together.....................................................................................36
Installing a Tiered AHU..........................................................................................................................38
Assembling the End Channel Shipping Split.........................................................................................40
Installing Damper Actuator ....................................................................................................................41
Installing Multi-Zone (MZ) Dampers......................................................................................................42
Installing Field Supplied MZ Damper Actuators ...................................................................................43
Shipped Loose Parts......................................................................................................................................43
Pipe Chase, Hoods and Seam Caps.....................................................................................................44
Additional Parts .....................................................................................................................................46
Air Filters ........................................................................................................................................................47
Maintaining and Replacing Filters .........................................................................................................47
Filter Installation
Installing a 2 in. Pleated Filter ...............................................................................................................50
Installing a 4 in. Pleated Filter ...............................................................................................................51
Installing a Single Headered (SH) Filter................................................................................................52
Installing a 2 in. Pre-Filter Combined with a SH Final Filter..................................................................52
Installing a Multi-Cell SBM Double Headered (DH) Filter......................................................................53
Installing a 2 in. and 4 in. Pre-Filter Combined with a DH Final Filter...................................................54
Hepa Filters....................................................................................................................................................56
Koch HEPA Filter Frame .......................................................................................................................56
Welded Bevel Seal Frame.....................................................................................................................57
Visual Control Filter Clamps...........................................................................................................................57
HEPA Filter Applications........................................................................................................................57
Filling Inertia Fan Base ..................................................................................................................................60
Thrust Restraint Replacement and Adjustment.............................................................................................. 60
Rear Discharge Orientation...................................................................................................................60
Aligning Sheaves ...........................................................................................................................................62
Using a Straightedge.............................................................................................................................62
Using a String........................................................................................................................................62
Belt Replacement Tensioning and Sheave Alignment for Top Mount.............................................................63
Steam Humidifier............................................................................................................................................65
UVC Emitter Lamps........................................................................................................................................65
Two Types of Lamps .............................................................................................................................65
Air Measuring Device Connections ...............................................................................................................70
Air Measuring at the Fan Inlets .............................................................................................................70
Air Measuring at Unit Outside Air Inlets.................................................................................................70
Back Draft Dampers for Dual Fans and Fan Arrays ......................................................................................71
Installing the Pipe Chase................................................................................................................................71
Tools and Materials ...............................................................................................................................71
Preparing Pipe Chase for Installation....................................................................................................71
Apply Gaskets .......................................................................................................................................72
Attach Pipe Chase.................................................................................................................................72
Seal Pipe Chase to AHU .......................................................................................................................73
Install Cover Angles...............................................................................................................................73
Install Base Rail Covers (If Applicable) .................................................................................................74
Installing External Vent Piping for Outdoor AHUs ..........................................................................................75
Condensate Drain Arrangement............................................................................................................75
General Electrical Information........................................................................................................................77
Power Connections ........................................................................................................................................77
Single Point Power................................................................................................................................77

Form PA102.20-N1 7
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
Motors for Supply, Return, and Exhaust Fans.......................................................................................78
Wiring the Energy Recovery Wheel ...............................................................................................................78
Wiring the Gas Heat Device...........................................................................................................................79
Wiring the Electric Heat Device......................................................................................................................80
Power Options.......................................................................................................................................80
Disconnect Switch Options....................................................................................................................80
Control Options .....................................................................................................................................81
Installing Electrical Heat Option ............................................................................................................81
Electric Humidifier ..........................................................................................................................................84
Humidifier .......................................................................................................................................................84
Field Penetrations for Piping and Electrical Connections...............................................................................85
Tools Required ......................................................................................................................................85
Material Required..................................................................................................................................85
Procedure..............................................................................................................................................85
Lights for AHUs ..............................................................................................................................................87
Piping Connections ........................................................................................................................................87
Coil Piping ......................................................................................................................................................88
Staggered Coils.....................................................................................................................................88
Hot and Chilled Water Coils ..................................................................................................................89
Water Treatment.............................................................................................................................................91
Freeze Protection..................................................................................................................................91
Steam Coils...........................................................................................................................................91
Steam Distributing Coils........................................................................................................................91
Steam Control .......................................................................................................................................91
Steam Traps..........................................................................................................................................91
Drains and Traps ............................................................................................................................................93
Condensate Drain Piping ......................................................................................................................93
Elevating AHU for Gravity Floor Drain Connections..............................................................................94
Duct Connections...........................................................................................................................................94
Duct Connection Guidelines..................................................................................................................94
Flanged Duct or Sleeves.......................................................................................................................94
Raw or Straight Edge Duct or Sleeves..................................................................................................95
Sound and Vibration Transmission .......................................................................................................95
Installing Top Discharge Outdoor AHU Duct .........................................................................................95
Installing Front and Rear Discharge Outdoor AHU Duct.......................................................................95
Vertical Tube Integral Face and Bypass (VIFB) and Integral Face and Bypass (IFB).................................... 97
Shipping Bolts (VIFB Only)....................................................................................................................97
Piping Suggestions ...............................................................................................................................97
Flexible Connectors (VIFB Only)...........................................................................................................97
Freezing Conditions ..............................................................................................................................97
Refrigeration.................................................................................................................................................101
DX Direct Expansion Coils ..................................................................................................................101
Available Coil Arrangements ..............................................................................................................103
Thermostatic Expansion Valves (TXV) ........................................................................................................105
Hot Gas Bypass (HGBP)..............................................................................................................................105
Dx Coil Circuiting and Staging......................................................................................................................105
Advantages of Multiple Control Stages ...............................................................................................106
Maintaining Adequate Airflow .....................................................................................................................106
VAV Systems................................................................................................................................................107
TABLE OF CONTENTS (CONT'D)

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 8Form PA102.20-N1
LIST OF FIGURES
FIGURE 1 - Cutaway Showing Segmented Construction .......................................................................................15
FIGURE 2 - AHU and Coil Hand Identication ........................................................................................................16
FIGURE 3 - AHU ID Label.......................................................................................................................................17
FIGURE 4 - Skid ID Label .......................................................................................................................................17
FIGURE 5 - Example of Segment ID Box................................................................................................................17
FIGURE 6 - Metal Spacers on Doors ......................................................................................................................21
FIGURE 7 - Recommended Lifting with Multiple Points..........................................................................................22
FIGURE 8 - Typical Come-A-Longs ........................................................................................................................22
FIGURE 9 - Proper Lifting with Shackle with Corner Connector Corners ...............................................................22
FIGURE 10 - Proper Lifting with Shackle at Lifting Lug...........................................................................................23
FIGURE 11 - Proper Lifting with Base Rail..............................................................................................................23
FIGURE 12 - Minimum Service Clearances............................................................................................................24
FIGURE 13 - Typical Curb Assembly ......................................................................................................................25
FIGURE 14 - No Base Rail - Housekeeping Pad Required to Accommodate Trap Height .....................................26
FIGURE 15 - No Housekeeping Pad - Base Rail Required to Accommodate Trap Height .....................................26
FIGURE 16 - With Base or Base Rail and Housekeeping Pad ............................................................................... 26
FIGURE 17 - Ceiling Suspended AHU on Structural Steel......................................................................................27
FIGURE 18 - Tools Needed to Assemble Shipping Splits .......................................................................................28
FIGURE 19 - Shipping Split Examples....................................................................................................................29
FIGURE 20 - Shipping Split Examples Using Structural Steel Baserails ................................................................ 30
FIGURE 21 - Applying Gasket Square, Neoprene Gasket and Caulk to Raceway Split.........................................30
FIGURE 22 - Typical Come-A-Longs ......................................................................................................................31
FIGURE 23 - Electrical Connector (Not Connected) ...............................................................................................31
FIGURE 24 - Electrical Connectors (Connected)....................................................................................................31
FIGURE 25 - Remove and Reposition Shipping Split Angle ...................................................................................31
FIGURE 26 - Come-A-Long Attached to a Section .................................................................................................32
FIGURE 27 - Bring Shipping Splits Together...........................................................................................................32
FIGURE 28 - Applying Caulk to Seams...................................................................................................................32
FIGURE 29 - Installing Gaskets ..............................................................................................................................33
FIGURE 30 - Corner Connector Hole Plug (P/N 021-19568-000)........................................................................... 33
FIGURE 32 - Use Gasket (P/N 028-11883-010) at Shipping Split ..........................................................................34
FIGURE 31 - Installing Hood with Optional Moisture Eliminators............................................................................34
FIGURE 34 - Assembly of End Channel Shipping Split with an Expanded Cabinet ...............................................35
FIGURE 33 - Use Gasket (P/N 028-11873-010) to Door Frame at Shipping Split ..................................................35
FIGURE 35 - Come-A-Long Attached to a Section .................................................................................................36
FIGURE 36 - Remove Lifting Lugs in Expanded Cabinet........................................................................................36
FIGURE 37 - Electrical Connector (Not Connected) ...............................................................................................36
FIGURE 38 - Electrical Connectors (Connected)....................................................................................................36
FIGURE 39 - Remove and Reposition Shipping Split Angle ...................................................................................37
FIGURE 40 - Bring Shipping Splits Together...........................................................................................................37
FIGURE 41 - Fasten Bottom Lifting Lugs................................................................................................................37
FIGURE 42 - Corner Connector Hole Plug (P/N 021-19568-000)........................................................................... 38
FIGURE 43 - Tiered AHU ........................................................................................................................................38
FIGURE 44 - Second Tier Tie-Down Fastener Pack (P/N 386-03419-000) ............................................................38
FIGURE 45 - Apply Gaskets to Top Panel on Bottom Tier ......................................................................................38
FIGURE 46 - Guide Brackets Together ...................................................................................................................39
FIGURE 47 - Lights Tier Transition Drawing ...........................................................................................................39

Form PA102.20-N1 9
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
LIST OF FIGURES (CONT'D)
FIGURE 48 - Assembling the End Channel Shipping Split with Energy Recovery Wheel ...................................... 40
FIGURE 49 - Installing the Direct Coupled Actuator................................................................................................ 41
FIGURE 50 - Installing MZ Damper......................................................................................................................... 42
FIGURE 51 - Damper Shaft Extension Kit (P/N 026-33715-002)............................................................................ 43
FIGURE 52 - Second Tier Tie-Down Fastener Pack (P/N 386-03419-000) ............................................................ 43
FIGURE 53 - Bottom Raceway Shipping Split Fastener Pack (P/N 386-03418-000).............................................. 43
FIGURE 54 - Base Rail Shipping Split Fastener Pack (P/N 386-03417-000) ......................................................... 44
FIGURE 55 - Top Raceway Bracket Assembled (P/N 386-04747-000)................................................................... 44
FIGURE 56 - Neoprene Gasket - 1/4 In. X 2 In. X 25 Ft (P/N 028-15954-010)....................................................... 44
FIGURE 57 - Neoprene Gray Gasket - 1/4 In X 3/4 In X 35 Ft (P/N 028-11873-010) for Door............................... 44
FIGURE 58 - Phillips Hex Head Screw (P/N 021-32268-011) For Indoor Unit Seam Cap...................................... 44
FIGURE 59 - Hex Head Screw For Outdoor Roof Seam Cap, Pipe Chase, and Rain Hood - 1/4 In-14 X 1 In (P/N
021-30530-052) ................................................................................................................................. 44
FIGURE 60 - Butyl Tape - 3/16 In X 3/4 In X 40 Ft (P/N 013E-03327-010)............................................................. 44
FIGURE 61 - Polyurethane caulk (Grey: P/N 021-19568-000; Champagne: P/N 013-03317-040) For Pipe Chase
Only ................................................................................................................................................... 45
FIGURE 62 - Roof Seam Cap (Assembled)............................................................................................................ 45
FIGURE 63 - Pipe Chase, Trim Angle, and Cover................................................................................................... 45
FIGURE 64 - Hood .................................................................................................................................................. 45
FIGURE 65 - Damper Shaft Extension Kit (P/N 026-33715-002)............................................................................ 46
FIGURE 66 - Corner Connector Hole Plug (P/N 021-19568-000) (8) ..................................................................... 46
FIGURE 67 - Touch-Up Spray - 12 Oz. (P/N 013-03322-000) ................................................................................ 46
FIGURE 68 - Shipping Split Corner Gasket - 3.5 X 3. 5 (P/N 028-11883-010) ...................................................... 46
FIGURE 69 - Spare Fan Belt................................................................................................................................... 46
FIGURE 70 - Conduit (P/N 025-39024-001) and SJO Cord (P/N 025-35746-001)................................................. 46
FIGURE 71 - Typical Filter Types............................................................................................................................ 47
FIGURE 72 - Filter Latches ..................................................................................................................................... 48
FIGURE 73 - Correctly Installed Latch Pin (P/N 026-35788-702) ........................................................................... 50
FIGURE 74 - Fully Installed Filter............................................................................................................................ 51
FIGURE 75 - Correctly Installed Latch Pin (P/N 026-35788-604) ........................................................................... 51
FIGURE 76 - Place End of Latch Over Filter Frame ............................................................................................... 51
FIGURE 77 - Correctly Installed Cartridge Filter ..................................................................................................... 52
FIGURE 78 - Correctly Installed Latch Pin (P/N 026-35788-604) ........................................................................... 52
FIGURE 79 - Correctly Installed Cartridge with Pleats............................................................................................ 52
FIGURE 80 - Correct use of Knockouts .................................................................................................................. 53
FIGURE 81 - Correct Latchout/Knockout Conguration.......................................................................................... 53
FIGURE 82 - Frame with Four Latches Installed on the Sides................................................................................ 53
FIGURE 83 - Spring Latch Pulled and Fastened in Filter Hole ............................................................................... 53
FIGURE 84 - Correct Latchout/Knockout Conguration (P/N 026-35788-612)....................................................... 54
FIGURE 85 - Spring Latch Pulled and Fastened in Filter Hole ............................................................................... 54
FIGURE 86 - Installing Pre-Filter Latch................................................................................................................... 54
FIGURE 87 - Position Pre-Filter in Front of Final Filter ........................................................................................... 55
FIGURE 88 - Spring End of Latch ........................................................................................................................... 55
FIGURE 89 - Completed Assembly......................................................................................................................... 55
FIGURE 90 - Installation of Koch HEPA Filters ....................................................................................................... 56
FIGURE 91 - Koch HF............................................................................................................................................. 57
FIGURE 92 - Hepa Filter (Cross Section) ............................................................................................................... 57

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 10 Form PA102.20-N1
LIST OF FIGURES (CONT'D)
FIGURE 94 - Installing Hepa Filter.......................................................................................................................... 58
FIGURE 93 - Visual Control Filter Clamps .............................................................................................................. 58
FIGURE 95 - Installing Welded Bevel Seal Filter .................................................................................................... 59
FIGURE 96 - Supply Fan Restraint ......................................................................................................................... 60
FIGURE 97 - Thrust Restraint Assembly................................................................................................................. 61
FIGURE 98 - Plenum Fan Thrust Restraint............................................................................................................. 61
FIGURE 99 - Alignment Using Straight Edge.......................................................................................................... 63
FIGURE 100 - Alignment Using String .................................................................................................................... 63
FIGURE 101 - Sheave Angular Misalignment ......................................................................................................... 64
FIGURE 102 - Motor Base Lowered........................................................................................................................ 64
FIGURE 103 - Sheave Angular Alignment............................................................................................................... 64
FIGURE 104 - Sheave Angular Misalignment ......................................................................................................... 64
FIGURE 105 - V-Max Grid Lamps........................................................................................................................... 65
FIGURE 106 - Installing V-Mod Lamp ..................................................................................................................... 65
FIGURE 107 - Installing V-Max Grid Lamps............................................................................................................ 65
FIGURE 108 - UV Control Panel Wiring (8 amps)................................................................................................... 67
FIGURE 109 - UV Control Panel Wiring (Greater Than 8 Amps)............................................................................ 68
FIGURE 110 - High and Low Connections for an in Fan Air Monitoring System..................................................... 70
FIGURE 111 - High and Low Connections and Associated Tubing for Fan Mounted Air Monitoring System ......... 70
FIGURE 112 - Port Locations for Fan Mounted Air Monitoring System................................................................... 70
FIGURE 113 - Counterbalance Locked Into Place for Shipping.............................................................................. 71
FIGURE 114 - Counterbalance Unlocked for Start-Up............................................................................................ 71
FIGURE 117 - Install Pipe Chase Base Rail to AHU Base Rail............................................................................... 72
FIGURE 115 - Install Gasket Under Roof Overhang............................................................................................... 72
FIGURE 116 - Apply Gasket to Pipe Chase ............................................................................................................ 72
FIGURE 118 - Install Flanges.................................................................................................................................. 72
FIGURE 119 - Apply Caulk to Base Rail.................................................................................................................. 73
FIGURE 120 - Apply Caulk Between Pipe Chase and AHU.................................................................................... 73
FIGURE 121 - Install Pipe Chase to Roof ............................................................................................................... 73
FIGURE 122 - Install Cover Angle........................................................................................................................... 74
FIGURE 123 - Position Cover Angle Properly......................................................................................................... 74
FIGURE 124 - Properly Install Screws .................................................................................................................... 74
FIGURE 125 - Apply Base Rail Cover..................................................................................................................... 74
FIGURE 126 - Gas Furnace Fuel Venting System.................................................................................................. 75
FIGURE 127 - Gas Furnace Condensate Drain Trap.............................................................................................. 76
FIGURE 128 - Single Point Power Connection ....................................................................................................... 77
FIGURE 131 - Access Electrical Box....................................................................................................................... 78
FIGURE 129 - Typical Motor Data/Name Plate....................................................................................................... 78
FIGURE 130 - Another Typical Motor Data/Name Plate.......................................................................................... 78
FIGURE 132 - Typical Power Wiring of Energy Recovery Wheel ........................................................................... 78
FIGURE 133 - Gas Burner Component Locations .................................................................................................. 79
FIGURE 134 - Main Power and Control Panel with Cover Open ............................................................................ 79
FIGURE 135 - Typical Electrical Heat Control Panel Interior Wiring and Components........................................... 80
FIGURE 136 - Typical Field and Power Connections.............................................................................................. 80
FIGURE 137 - Pressure Probe Direction................................................................................................................. 82
FIGURE 138 - Air Flow Switch Connections ........................................................................................................... 82
FIGURE 139 - Layout of Typical Humidier Panel .................................................................................................. 84

Form PA102.20-N1 11
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
LIST OF TABLES
TABLE 1 - Definition of Segment IDs......................................................................................................................18
TABLE 2 - Koch Filter Clips - Single Filter Application............................................................................................49
TABLE 3 - Koch Filter Clips - Pre-Filter / Final Filter Application ............................................................................49
TABLE 4 - AAF Clips for Filter Frames - Single Filter Application...........................................................................49
TABLE 5 - AAF Pre-Filter/Final Filter Application ...................................................................................................50
TABLE 6 - Visual Control Filter Clamps for HEPA Filters .......................................................................................58
TABLE 7 - TSP and Drain Trap...............................................................................................................................76
TABLE 8 - Maximum Current..................................................................................................................................83
FIGURE 140 - Supply Power Knockouts.................................................................................................................84
FIGURE 141 - Humidier Points..............................................................................................................................84
FIGURE 142 - Penetrations and Grommet Details.................................................................................................86
FIGURE 143 - AHU with Lights Tier Transition Drawing..........................................................................................87
FIGURE 144 - Pipe Chase Enclosure .....................................................................................................................87
FIGURE 145 - Factory Coil Connections.................................................................................................................88
FIGURE 146 - Staggered Coil - Angled Wall...........................................................................................................88
FIGURE 147 - Split Coil - Opposite Side Connections............................................................................................89
FIGURE 148 - Chilled Water Coil Connections Example - (Not for Construction) ..................................................89
FIGURE 149 - Hot Water Piping with 2-Way Valve Example (Not for Construction)............................................... 90
FIGURE 150 - Hot Water Piping with Diverting Valve Example (Not for Construction)...........................................90
FIGURE 151 - Steam Coil Piping Arrangements.....................................................................................................92
FIGURE 152 - Drain Trap Showing Water Location for Draw Through Operation ..................................................93
FIGURE 153 - Trap Detail for Drain Pan in Negative Environment (Draw Through)............................................... 93
FIGURE 154 - Trap Detail for Drain Pan in Positive Environment (Blow Through).................................................93
FIGURE 155 - Combining Drain Lines ....................................................................................................................94
FIGURE 156 - Recommended Discharge Duct Arrangement when Turns are Required........................................ 94
FIGURE 157 - Duct Arrangement for Flange and Raw Edge Ducts........................................................................95
FIGURE 159 - Roof to Duct Installation (Horizontal Discharge)..............................................................................96
FIGURE 158 - Duct Penetration of Roof .................................................................................................................96
FIGURE 160 - IFB Coil (Horizontal Tubes Available with Steam and Hot Water) ...................................................98
FIGURE 161 - VIFB Coil (Face-Mounted Actuator Shown).....................................................................................98
FIGURE 162 - Hot Water Piping Schematic for 2-Row Coil VIFB........................................................................... 98
FIGURE 163 - Hot Water Piping for IFB..................................................................................................................99
FIGURE 164 - Steam Piping for VIFB ...................................................................................................................100
FIGURE 165 - Typical Piping and Sundries at the DX Coil ...................................................................................102
FIGURE 166 - DX Coil Circuiting Types................................................................................................................102
FIGURE 167 - Non-Stacked Coil Design (Special Quote).....................................................................................103
FIGURE 168 - Non-Stacked Coil Design (Standard).............................................................................................103
FIGURE 169 - Stacked Coil Design (Standard) ....................................................................................................104
FIGURE 170 - Stack Coil Designs (Special Quote)...............................................................................................104
FIGURE 171 - Stacked Coil Circuiting...................................................................................................................105
FIGURE 172 - One Coil Circuit Per Refrigerant Circuit.........................................................................................105
FIGURE 173 - Two Coil Circuit Per Refrigerant Circuit .........................................................................................105
FIGURE 174 - Three Compressor Unit .................................................................................................................106
FIGURE 175 - Six Compressor Unit......................................................................................................................106
LIST OF FIGURES (CONT'D)

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 12 Form PA102.20-N1
SERVICE TASK REFERENCE
Air Filters 47
Installing a 2 in. Pleated Filter 50
Installing a 4 in. Pleated Filter 51
Installing a Single Headered (SH) Filter 52
Installing a 2 in. Pre-Filter Combined with a
SH Final Filter 52
Installing a Multi-Cell SBM Double Headered
(DH) Filter 53
Installing a 2 in. and 4 in. Pre-Filter Combined
with a DH Final Filter 54
Air Measuring Device Connections 70
Assembling the End Channel Shipping Split 40
Assembling the PACE Provided Curb 24
Clearance and Mounting for Indoor AHUs 26
Coil Piping 88
Staggered Coils 88
Hot and Chilled Water Coils 89
Water Treatment 91
Condensate Drain Arrangement 75
Drains and Traps 93
Condensate Drain Piping 93
Elevating AHU for Gravity Floor Drain
Connections 94
Duct Connections 94
Duct Connection Guidelines 94
Flanged Duct or Sleeves 94
Raw or Straight Edge Duct or Sleeves 95
Sound and Vibration Transmission 95
General Electrical Information 77
HEPA Filters 56
Hot Gas Bypass (HGBP) 105
Inspection, Damage, and Shortage 20
Receiver's Responsibility 20
Shipped Loose Parts 21
Installing Ceiling Suspended AHUs 27
Installing Damper Actuator 41
Installing Multi-Zone (MZ) Dampers 42
Installing Field Supplied MZ Damper Actuators 43
Installing External Vent Piping for Outdoor
AHUs 75
Installing Hood with Moisture Eliminator 33
Installing Indoor AHU 34
Installing an AHU with Expanded Cabinet 35
Installing Outdoor AHU 28
Single Piece 28
Multi-Piece 29
Installing Pipe Chase 71
Tools and Materials 71
Apply Gaskets 72
Attach the Pipe Chase 72
Install Cover Angles 73
Install Base Rail Covers 74
Installing Tiered AHU 38
Long Term Storage 20
Piping Connections 87
Power Connections 77
Single Point Power 77
Wiring the Gas Heat Device 79
Wiring the Electric Heat Device 80
Electric Humidier 84
Humidier 84
Lights for AHUs 87
Preparing the Site 23
Proper Lifting with Shackles 22
Refrigeration 101
DX Direct Expansion Coils 101
Available Coil Arrangements 103
Rigging 21
Indoor and Outdoor AHUs 21
Shipped Loose Parts 43
Short Term Storage 19
Thermostatic Expansion Valves (TXV) 105
Tools Required to Install AHU 28
UVC Emitter Lamps 65
Two Types of Lamps 65
VAV System 107
VIFB and IFB 97
Shipping Bolts 97
Visual Control Filter Clamps 57

Form PA102.20-N1 13
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
1
SECTION 1 - GENERAL INFORMATION AND SAFETY
INTRODUCTION
The air handling unit (AHU) is manufactured to the
highest design and construction standards to ensure
high performance, reliability and adaptability to all
types of air handling installations.
This manual and any other document supplied with the
AHU are the property of PACE™, which reserves all
rights. This manual may not be reproduced, in whole
or in part, without prior written authorization from an
authorized PACE representative.
In addition, this manual:
• Includes suggested best working practices and
procedures, which are issued for guidance only,
and they do not take precedence over the above
stated individual responsibility and/or local safety
regulations.
• Contains all the information required for correct in-
stallation and commissioning of the AHU, together
with operating and maintenance instructions.
• Should be read thoroughly before attempting to
operate or service the AHU.
• Contains detailed procedures, including installa-
tion, commissioning and maintenance tasks that
must only be performed by suitably trained and
qualied personnel.
Rigging and lifting should only be done by a profes-
sional rigger in accordance with a written rigging and
lifting plan. The most appropriate rigging and lifting
method will depend on job specific factors, such as the
rigging equipment available and site needs. Therefore,
a professional rigger must determine the rigging and
lifting method to be used, and it is beyond the scope of
this manual to specify rigging and lifting details.
The manufacturer will not be liable for any injury or
damage caused by incorrect installation, commission-
ing, operation, or maintenance resulting from a failure
to follow the procedures and instructions detailed in the
manual.
WARRANTY
PACE warrants AHUs in accordance with the Limited
Warranty Engineered Systems Equipment procedure.
Refer to the Standard Limited Warranty Engineered
Systems Equipment (Form PA50.05-NM2) for more
information.
PACE warrants all equipment and materials against
defects in workmanship and materials for a period of
18 months from the date of shipment or 12 months
from the date of start-up, whichever comes first, un-
less labor or extended warranty has been purchased
as part of the contract.
The warranty is limited to parts only replacement and
shipping of any faulty part, or subassembly, which has
failed due to defects in workmanship and materials. All
claims must be supported by evidence that the failure
has occurred within the warranty period, and that the
AHU was operated within the designed parameters
specified.
All warranty claims must specify the AHU model, se-
rial number, order number, and run hours/starts. Model
and serial number information is printed on the AHU
identification plate.
The AHU warranty will be void if any modification to the
AHU is carried out without prior written approval from
PACE. For warranty purposes, the following conditions
must be satisfied:
• Only genuine PACE approved spare parts must
be used.
• All of the scheduled maintenance operations de-
tailed in this manual must be performed at the
specied times by suitably trained and qualied
personnel.
• Failure to satisfy any of these conditions will au-
tomatically void the warranty. Refer to Standard
Limited Warranty Engineered Systems Equipment
(Form PA50.05-NM2) for details.
RESPONSIBILITY FOR SAFETY
Every care has been taken in the design and manufac-
ture of the AHU to ensure compliance with the safety
requirements. However, the individual operating or
working on any equipment is primarily responsible for:
• Personal safety, safety of other personnel, and
the equipment.
• Correct utilization of the equipment in accordance
with the procedures detailed in this manual.

PACE │Installation & Assembly Manual
Issue Date: 07/03/2018 14 Form PA102.20-N1
THIS PAGE INTENTIONALLY LEFT BLANK.

Form PA102.20-N1 15
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
2
SECTION 2 - PRODUCT DESCRIPTION
Ventilation System
The purpose of a ventilation system is to remove air that
is substandard to creature comfort or a process, and re-
place it with suitable air. Depending on the application,
the system will operate at various specified rates, vol-
umes, and conditions. A ventilation system may employ
an AHU with a supply fan working in conjunction with a
remote exhaust fan(s). A more effective method would
employ a supply fan and an exhaust fan in the AHU.
Economizer System (Typical)
The economizer system typically consists of:
• Outdoor and return air dampers
• Damper actuator
• Enthalpy control
• Minimum outdoor air adjustment
• Exhaust air control
The economizer system provides the first stage of cool-
ing whenever the outdoor air is cool and dry enough to
satisfy the internal cooling demand. The outdoor and
the return air dampers are operated by individual ac-
tuators. As the outdoor air dampers are opened by the
damper actuator, the return air dampers are closed.
The AHU features segmented construction, and is fac-
tory assembled. Segment arrangements will vary to suit
the job application as shown in Figure 1 on page 15.
Features of the AHU include:
• Heavy gauge galvanized steel is used on the ex-
terior and interior of the AHU.
• Access doors are provided for accessibility to the
various sections.
• Removable access panels are standard in lieu of
doors on commercial performance AHUs.
• Panels and doors are constructed with double
walls.
• Panels, doors, and structural frame are insulated
with spray-injected foam.
TYPICAL OPERATION
The operation of the AHU is divided into four systems:
1. Ventilation
2. Economizer (Return Air/Mixing Box Section)
3. Heating
4. Cooling
5. Cleaning
LD13764
Figure 1 - Cutaway Showing Segmented Construction

SECTION 2 - PRODUCT DESCRIPTIONPACE │Installation & Assembly Manual
Issue Date: 07/03/2018 16 Form PA102.20-N1
HEATING AND COOLING SYSTEM
Various types of heating and cooling may be applied,
which include:
• Hot water or steam coils
• Electric or fuel burner heat
• Factory mounted chilled water coils
• Direct expansion refrigerant coils
CLEANING
Various types opf cleaning include filters and UV lights.
HAND ORIENTATION
Coil connections and other components are located
and described as left or right hand. The proper orienta-
tion to describe the proper hand is when airflow is at
your back as shown in Figure 2 on page 16.
AHU IDENTIFICATION (ID)
Indoor and outdoor AHUs are labeled with the following
ID labels:
• AHU
• Skid
• Loose Components
Indoor AHUs are shrink wrapped with skid ID labels on
the outside of the wrapping and on each skid.
LD08004
Figure 2 - AHU and Coil Hand Identification
FAN SECTION RIGHT
REAR
LEFT HAND (LH)
COIL CONNECTION
RETURN AIR
LEFT
INLET SECTION
OUTSIDE AIR
FRONT
RIGHT HAND (RH)
COIL CONNECTION
DRIVE HAND AND COIL HAND DETERMINED
BY FACING THE INLET SECTION

Form PA102.20-N1 17
Installation & Assembly Manual │ PACESECTION 2 - PRODUCT DESCRIPTION
Issue Date: 07/03/2018
2
AHU ID Label
The AHU ID label contains the following information as
shown in Figure 3 on page 17:
• Model Number
• Serial Number/Date Code
• Job ID Number
• Segment ID Number
• Number of Skids
• AHU Tag Number
• Electrical Ratings
• Coil Data
• Manufacturing Location
Figure 3 - AHU ID Label
AHU_ID_PA
Skid ID Label
Each skid in a multi-piece AHU is marked with a skid
ID label, which indicates its order of assembly in the
direction of airflow as shown in Figure 4 on page 17.
Segment ID Box
The segment ID box indicates the skids and segments
used on a multi-piece AHU. The contents of each skid
are indicated by the segment(s) surrounded by paren-
theses as shown in Figure 5 on page 17. Refer to
Table 1 on page 18 for the segment definitions.
LD11729b
Figure 4 - Skid ID Label
(Skid 4 of 5)
(Skid 3 of 5)
(Skid 2 of 5)
(Skid 1 of 5)
Direction of
Order of Assembly
Figure 5 - Example of Segment ID Box
LD11752a
(Skid 5 of 5)
(FS)(CC-HM)(XA-IC-XA-RF)(EE) (FR)

SECTION 2 - PRODUCT DESCRIPTIONPACE │Installation & Assembly Manual
Issue Date: 07/03/2018 18 Form PA102.20-N1
Table 1 - Definition of Segment IDs
FAN SEGMENTS
FS – SUPPLY
Forward Curved DWDI
Airfoil DWDI
Industrial Airfoil DWDI
SWSI Airfoil Plenum (Belt and Direct Drive)
FR – RETURN
Forward Curved DWDI
Airfoil DWDI
Industrial Airfoil DWDI
SWSI Airfoil Plenum (Belt and Direct Drive)
FE – EXHAUST
Forward Curved DWDI
Airfoil DWDI
Industrial Airfoil DWDI
SWSI Airfoil Plenum (Belt and Direct Drive)
COIL SEGMENTS
CC – COOLING COIL
HC – HEATING COIL
VC – VERTICAL COIL
MZ – MULTI-ZONE
HEAT SEGMENTS
IC – INTEGRAL FACE AND BYPASS COIL
IG – INDIRECT GAS FIRED FURNACE
EH – ELECTRIC HEATER
ENERGY RECOVERY
ER – HEAT WHEEL
HW – HEAT WHEEL
FILTER SEGMENTS
FF – FLAT FILTER (2 or 4 in.)
AF – ANGLE FILTER (2 or 4 in.)
RF – HIGH EFFICIENCY FILTER
Rigid Filter (12 in.)
Bag Filter (21 in.)
Mini-Pleat Filter (4 in.)
HF – HIGH EFFICIENCY FILTER
INLET SEGMENTS
MB – MIXING BOX
FM – FILTER/MIXING BOX
EF – FILTER/ECONOMIZER
EE – ECONOMIZER
IP – INLET PLENUM
VE – VERTICAL ECONOMIZER
VF – VERTICAL FILTER/ECONOMIZER
IO – INLET/OUTLET
ACCESSORY SEGMENTS
VP – VERTICAL PLENUM
DP – DISCHARGE PLENUM
TN – TURNING PLENUM
DI – DIFFUSER
XA – ACCESS SEGMENT
AB – AIR BLENDER
EB – EXTERNAL BYPASS
IB – INTERNAL BYPASS
FD – FACE DAMPER
HM – HUMIDIFIER
AT – SOUND ATTENUATOR
UV – UV LIGHTS
Shipped Loose Parts
Each loose component has a label to show where it
should be installed on the AHU. The segment ID box
on the label will show the skid on which it is to be in-
stalled. If the loose component is used in only one seg-
ment on a skid, the segment ID (e.g. MB) will be bold.
DIRECTION OF AIRFLOW
The direction of airflow is always read from right to left.

Form PA102.20-N1 19
Installation & Assembly Manual │ PACE
Issue Date: 07/03/2018
3
DELIVERY AND STORAGE
To ensure consistent quality and maximum reliability,
all AHUs are tested and inspected before leaving the
factory.
Short Term
Indoor AHUs: Under no circumstances
should outdoor storage be used.
• Remove of ventilate wrapping to
prevent condensation.
Outdoor AHUs: Recover AHUs after
inspection or use tarps during storage.
Short term storage is six months or less from date of
shipment. Storage maintenance during this time is
usually limited to the following:
• Rotate fans every four weeks, starting on the de-
livery date to prevent moisture from damaging the
bearing.
• If the AHUs are going to be stored out-of-doors,
prior to installation, special care must be taken to
cover and protect the AHUs from:
• Dust
• Rain and snow
• Rodents
• Construction vehicles and personnel.
• Condensation / Ventilation required
• Protect all parts and porous materials from rain
and other sources of moisture. Decontaminate or
replace parts as needed to make sure microbial
growth is not introduced to the AHU.
• Store the AHU on a rm, at surface to prevent
distortion. Block the AHU off the ground to protect
components from water or ground moisture.
SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
Rigging and lifting should only be done by a professional rigger in accordance with a written
rigging and lifting plan. The most appropriate rigging and lifting method will depend on job spe-
cic factors, such as the rigging equipment available and site needs. Therefore, a professional
rigger must determine the rigging and lifting method to be used, and it is beyond the scope of
this manual to specify rigging and lifting details.
LD19197

SECTION 3 - HANDLING, STORAGE, AND INSTALLATIONPACE │Installation & Assembly Manual
Issue Date: 07/03/2018 20 Form PA102.20-N1
Long Term
Long term storage is more than six months from the
date of shipment. If long term storage is anticipated,
contact the PACE sales representative for the proper
instructions and requirements.
It is mandatory that a detailed record be maintained
during this long term period, such as, but not limited to
the following:
• Proper sealing of the cabinet
• Rotation of the blowers and bearings
• Protection of all motors from moisture
Refer to Long Term Storage Requirement - Field Prep-
aration (Form PA50.20-NM3) and Long Term Storage
Periodic Checklist and Logs (Form PA50.20-CL3) for
more information.
Failure to fulfill the long term storage
requirements will void the warranty.
Receiver’s Responsibility
The receiver is solely responsible for noting the
freight bill and filling out the freight claims IMME-
DIATELY. In addition, the receiver must:
• Note the visible damage on the signed and
dated bill of lading with a request that the
carrier inspect the damage within 72 hours
of notification.
• Remove the shipping wrapper, and replace it
with a tarp or similar protective covering. Any
concealed damage reported after 15 days will
compromise a claim settlement.
• Request inspections by telephone or in person,
but confirm in writing. If assistance is needed
with the claim process, contact a PACE sales
representative and refer to the shipping
damage form.
INSPECTION, DAMAGE, AND
SHORTAGE
Check the AHU shipment on arrival to make sure that
all major pieces, boxes, and crates are received. Check
each AHU on the trailer or rail car when received, be-
fore unloading, for any visible signs of damage. Report
any damage or signs of possible damage to the trans-
portation company immediately for its inspection.
After inspecting the AHU for damage, open all contain-
ers and check the contents against the packing list.
Report any material shortage to PACE immediately.
PACE WILL NOT BE RESPONSIBLE
FOR ANY DAMAGE OR LOSS OF PARTS
IN SHIPMENT OR AT JOB SITE. Refer
to Shipping Damage Claims (Form
50.15-NM).
Preventive Maintenance Prior to Long
Term Storage
Take the following precautions prior to extended stor-
age:
• Grease the fan and motor bearings per the manu-
facturer’s specications.
• Protect the motors and sheaves from free mois-
ture or high humidity, which may be accomplished
by:
• Spraying components with an anti-rust solu-
tion (P/N 026-37707-000).
• Disconnecting the belts. Wrapping the
sheaves and motor and sealing them with
plastic. Inserting a desiccant to absorb mois-
ture that may penetrate the plastic protection.
• Meg the fan motor windings and record for com-
parison prior to placing the AHU in service.
• If the fan housing was supplied with a drain con-
nection, remove the plug to prevent moisture from
accumulating in this part of the fan during storage.
Periodic Fan Check
On a monthly basis, perform the following tasks:
• Rotate the fan and motor several times to replen-
ish the bearing surfaces with fresh grease.
• Turn the fan impeller 180° from the previous
month's position to prevent the belts from taking
a set position.
Monthly Log Sheet
It is the customer's responsibility to submit a monthly
log sheet from the Long Term Storage Periodic Check-
list and Logs (Form PA50.20-CL3) that shows the con-
dition of the AHU and to note any discrepancies. Send
a copy of the log sheet to the PACE Field Service Of-
fice for its records.