Trane FADA, FAHA Installation and Maintenance Manual

Installation, Operation, and Maintenance

Packaged Fresh Air Unit

For 100% Outdoor Air Applications

Models FADA and FAHA

“BO” and later design sequence

April 2003

FAXA-SVX01B-EN

general information

About This Manual

Literature Change History

Use this manual for Packaged Fresh Air units, models FADA and FAHA. This is the “B” issue of this manual, revised to include the total energy wheel option. It provides specific installation, operation, and maintenance instructions for “BO” and later design sequences.

These units have modular DDC controls that provide operating functions significantly different than conventional air conditioning units. Refer to the startup and test mode procedures within this manual. Also, reference the Trane publication, Packaged Fresh Air Unit Programming Guide, FAXA-SVP01B-EN.

For units with gas heat, also reference the Reznor Installation Form RGM 401 Installation/Operation/Service Manual.

Overview of Manual

This manual describes proper installation, startup, operation, and maintenance procedures for the Packaged Fresh Air unit. Carefully review the information within this manual and follow the instructions to minimize risk of improper operation and/or component damage.

The roof curb specifically designed for the Packaged Fresh Air unit is available in 14” or 24” height from Trane. The curb must be mounted on a permanent roof structure before attempting to install the unit. Reference the roof curb installation instructions in the Trane publication,

“Accessory Roof Curb Kit” Installation Manual, FAXA-SVN01B-EN. Dimensional data for use with curbs other than Trane, can be found on pages 15-32 of this manual.

Note: One copy of this manual ships inside the control panel of each unit.

It is important that you perform periodic maintenance to help ensure trouble free operation. Should equipment failure occur, contact a qualified Trane service organization for an experienced HVAC technician to properly diagnose and repair this equipment.

Note: Do not release refrigerant to the atmosphere!

If adding or removing refrigerant, the service technician must comply with all federal, state, and local laws.

Warnings and Cautions

WARNING

Warnings indicate potential hazardous situations, which if not avoided, can cause death or serious injury.

CAUTION

Cautions indicate a potentially hazardous situation, which if not avoided, may cause minor or moderate injury. Also, cautions may alert against unsafe practices.

CAUTION

Cautions indicate a situation that may cause equipment or property-damage only.

Examples follow below.

WARNING

Hazardous voltage!

Disconnect all electrical power including remote disconnects before servicing unit. Follow proper lockout/ tagout procedures to ensure power cannot be inadvertently energized. Failure to do so can cause death or serious injury.

cfm = cubic-feet-per-minute CKT. = circuit

CV = constant volume CW = clockwise

CCW = counterclockwise E/A = exhaust air

ECEM = exhaust/comparative enthalpy module

F/A = fresh air FAU = fresh air unit

GBAS = generic building automation system

HI = human interface I/O = inputs/outputs

IOM= installation/operation/maintenance manual

IPC = interprocessor communications LCI = LonTalk™ communication interface LH = left-hand

MCM = multiple compressor module MWU = morning warmup

NSB = night setback O/A = outside air

psig = pounds-per-square-inch, gage pressure

R/A = return air RH = right-hand

RPM = revolutions-per-minute RTM = rooftop module

S/A = supply air

SCM = single circuit module SZ = single-zone (unit airflow)

TCI = Tracer communications module UCM = unit control modules

VAV = variable air volume

VCM = ventilation control module VOM = ventilation override module ZSM = zone sensor module

CAUTION

Use copper conductors only!

Unit terminals are not designed to accept other type conductors. Failure to use copper conductors may cause equipment damage.

Common HVAC Acronyms

For convenience, a number of acronyms and abbreviations are used throughout this manual. These acronyms are alphabetically listed and defined below.

BAS = building automation systems

Special Note on Refrigeration Emissions

World environmental scientists have concluded that ozone in our upper atmosphere is being reduced due to the release of CFC fully halogenated compounds. Trane urges all HVAC service personnel to make every effort to prevent any refrigerant emissions while installing, operating, or servicing equipment. Always conserve refrigerants for continued use and follow all warnings and cautions in this manual.

©2003 American Standard Inc.

FAXA-SVX01B-EN

contents

Cross reference to related publications:

•Packaged Fresh Air Unit Programming Guide, FAXA-SVP01B-EN

•Accessory Roof Curb Installation Manual, FAXA-SVN01B-EN

•Reznor Installation Form RGM 401, Installation/Operation/Service for units with gas heat

Installation ……………………………………………………………2

General Information……………………………………………2

Pre-installation Considerations ………………………………8

Dimensions/Weights …………………………………………15

Mechanical Requirements …………………………………33

Electrical Requirements………………………………………36

Installation Procedure ………………………………………40

Pre-Startup Requirements …………………………………51

Startup …………………………………………………………52

Operation ……………………………………………………………54

General Information …………………………………………54

Sequence of Operation ………………………………………62

Maintenance………………………………………………………… 67

General Information …………………………………………67

Maintenance Procedures ……………………………………71

Periodic Checklists ……………………………………………77

Index ………………………………………………………………… 79

Note: This document is customer property and must be retained by the unit’s owner for use by maintenance personnel.

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3

general Installation information

Packaged Fresh Air unit Model Number Description

Following is a complete description of the Packaged FAU model number. Each digit in the model number has a corresponding code that identifies specific unit options.

F	A D A 040			6 G A,0 0,8,4 0 1 A 0 1 A 0,5,7 0,7 A 0 0 0 E F 0 1 0,0,0											0,0 A A A A
1	2	3	4 5,6,7	8 9 10,11 12,13,141516171819 20 21,22,23 24,25 26 27 28 29 30 31 32 33 34,35,36 37,38 39 40 41 42

Digit 1 – Unit model

F = fresh air unit

Digit 2 – Unit configuration

A= air cooled

Digit 3 – Unit discharge direction

D= downflow H= horizontal

Digit 4 – Development sequence

A = development sequence ‘A’

Digits 5, 6, 7 – Unit size

031 = 3100 cfm

040 = 4000 cfm

051 = 5100 cfm

066 = 6600 cfm

Digit 8 – Unit voltage

3 = 230 volt/60 hz/3 ph

4 = 460 volt/60 hz/3 ph

6 = 208 volt/60 hz/3 ph

Digit 9 – Heating system

0 = none

A= gas low rise, single bank, 2-stage B = gas low rise, single bank, 2:1

modulate

C = gas high rise, single bank, 2-stage D= gas high rise, single banks, 2:1

modulate

E = gas dual bank, 4-stage

F = gas dual bank 4:1 modulate G= electric heat, 3-stage

H= electric heat, 7-stage

K = hydronic interface only

Digits 10, 11 – Design sequence

** = factory assigned

Digits 12, 13, 14 – Heat input

000 = none

020 = 20 kW

026 = 26 kW

032 = 32 kW

042 = 42 kW

056 = 56 kW

070 = 70 kW

084 = 84 kW

100 = 100 kW

122 = 122 kW

125 = 125 MBh

150 = 150 MBh

200 = 200 MBh

250 = 250 MBh

300 = 300 MBh				107	= 1075	160 = 1600
350 = 350 MBh				110	= 1100	162 = 1625
400 = 400 MBh				112	= 1125	165 = 1650
500 = 500 MBh				115	= 1150	167 = 1675
600 = 600 MBh				117 = 1175		170 = 1700
700 = 700 MBh				120 = 1200		172 = 1725
800= 800 MBh				122 = 1225		175 = 1750
				125 = 1250		177 = 1775
Digit 15 – Heat exchanger material				127 = 1275		180 = 1800
0	= none			130 = 1300		182 = 1825
1	= 409 stainless steel, 409 stainless Burner			132 = 1325		185 = 1850
2	= 321 stainless steel, 409 stainless burner			135 = 1350		187 = 1875
				137 = 1375		190 = 1900
Digit 16 – Condenser reheat coil				140 = 1400		192 = 1925
0	= none			142 = 1425		195 = 1950
1	= condenser hot gas reheat coil			145 = 1450		197 = 1975
				147 = 1475		200 = 2000
Digit 17 – Ventilation damper type				150 = 1500		202 = 2025
0	= parallel blade damper			152 = 1525		205 = 2050
1	= TRAQ™ damper with air flow			155 = 1550		207 = 2075
	measurement			157 = 1575		210 = 2100
Digit 18 – Energy recovery				Digits 24, 25 – Supply fan horsepower
0	= none
1	= total energy wheel w/occupancy			01 = 1
	control			02 = 2
2	= total energy wheel w/dry bulb control			03 = 3
				05 = 5
Digit 19 – Return air damper				07	= 7.5
0	= none			10 = 10
1	= bottom	return/reference enthalpy		15 = 15
2	= bottom	return/comparative enthalpy		Digit 26 – Fan motor type
Digit 20 – Supply fan type1				A= standard efficiency ODP fan motor
A= 12 - 9 centrifugal fan				B = high efficiency ODP fan motor
B = 15 - 11 centrifugal fan				Digit 27 – Coil protection
C = 18 - 13 centrifugal fan
				0 = none
Digits 21, 22, 23 – Supply fan rpm				A= corrosion		inhibiting coating
037 = 375		072	= 725	Digit 28 – Unit cabinet protection
040 = 400		075	= 750
042 = 425		077	= 775	0 = standard prepainted steel finish
045 = 450		080	= 800	A= corrosion		inhibiting coating
047 = 475		082	= 825	Digit 29 – Filter type
050 = 500		085	= 850
052 = 525		087	= 875	0 = field-provided filter
055 = 550		090	= 900	1 = dirty filter switch (DFS) with field-
057 = 575		092	= 925		provided	filter
060 = 600		095	= 950	2 = 2” pleated media filters
062 = 625		097	= 975	3 = 2” pleated media filters & DFS
065 = 650		100	= 1000	Digit 30 – System control
067 = 675		102	= 1025
070 = 700		105	= 1050	A= supply air dehumidification
				B = supply air dehimidification with zone
Note1: The first number in this description indicates the					RH reference
	fan wheel diameter (in.). The second number			E = zone dehumidification
	indicates the fan wheel width.

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general Installation information

F = zone dehumidification with OA RH reference

G= supply air temperature control (no dehumidification)

J = zone temperature control (no dehumidification)

Digit 31 – Control interface options

0 = none

A= LonTalk® communications interface (LCI ) (comm5)

B = LCI (comm5) & generic building automation system (GBAS) (0-5 VDC)

C = LCI (comm5) & GBAS (0-5 VDC) & ventilation override module (VOM)

D= LCI (comm5) & VOM E = GBAS (0-5 VDC)

F = GBAS (0-5 VDC) & VOM G= VOM

Digit 32 – Miscellaneous system control options

0 = none

1 = interface for remote human interface

Digit 33 – Exhaust option

0 = none

1 = exhaust interface

Digits 34, 35, 36 – Exhaust air fan rpm

000	= none	127 = 1275
045	= 450	130 = 1300
047	= 475	132 = 1325
050	= 500	135 = 1350
052	= 525	137 = 1375
055	= 550	140 = 1400
057	= 575	142 = 1425
060	= 600	145 = 1450
062	= 625	147 = 1475
065	= 650	150 = 1500
067	= 675	152 = 1525
070	= 700	155 = 1550
072	= 725	157 = 1575
075	= 750	160 = 1600
077	= 775	162 = 1625
080	= 800	165 = 1650
082	= 825	167 = 1675
085	= 850	170 = 1700
087	= 875	172 = 1725
090	= 900	175 = 1750
092	= 925	177 = 1775
095	= 950	180 = 1800
097	= 975	182 = 1825
100	= 1000	185 = 1850
102	= 1025	187 = 1875
105	= 1050	190 = 1900
107	= 1075	192 = 1925
110	= 1100	195 = 1950
112	= 1125	197 = 1975
115	= 1150	200 = 2000
117 = 1175		202 = 2025
120 = 1200		205 = 2050
122 = 1225		207 = 2075
125 = 1250		210 = 2100

Digits 37, 38 – Exhaust air fan horsepower

00 = none

01 = 1

02 = 2

03 = 3

05 = 5

07 = 7.5

10 = 10

Digit 39 – Unit connection type

A= terminal block

B = non-fused disconnect switch

Digit 40 – Convenience outlet

0 = none

A= 115V, factory wired B = 115V, field wired

Digit 41 – Extended grease lines

0 = none

A= extended grease lines

Digit 42 – Agency approval

0 = no agency approval A= UL approval

Digit 43 – Roof curb

A= 14” curb

B = 24” curb

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general Installation information

Packaged Fresh Air unit Accessory Model Number Description

Following is a complete description of the Packaged FAU accessory model number. Each digit in the model number has a corresponding code that identifies specific accessory options.

P

F

K

A

031

3

A

A0

B

C

0

A

A

0

A

0

A

0

A

0

A

1

2

3

4

5, 6, 7

8

9

10,11

12

13

14

15

16

17

18

19

20

21

22

23

24

Digit 1 – Parts/accessories

C = 2” pleated media total energy wheel

Digit 17 – Zone sensor with timed override

P = parts/accessories

only

0

= none

Digit 2 – Unit type

D = 2” cleanable total energy wheel only

A = zone temperature densor with timed

E = 2” pleated media unit & total energy

override BAYSENS013*

F

= fresh air unit

wheel

F = 2” cleanable unit & total energy wheel

Digit 18 – Zone sensor with timed override

Digit 3 – Field installed kits

and local setpoint adjustment

K = field installed kits

Digit 13 – Control interface kits

0

= none

0 = none

A = zone temperature sensor with timed

Digit 4 – Development sequence

A= LonTalk® communications

interface

override buttons and local setpoint

A = development sequence

(LCI) (comm5)

adjustment BAYSENS014*

Digits 5, 6, 7 – Nominal size

B = LCI (comm5) & generic building

Digit 19 – Remote minimum position

automation system (GBAS) (0-5 VDC)

031= 3100 cfm

C = LCI (comm5) & GBAS (0-5 VDC) &

potentiometer control

040= 4000 cfm

ventilation override module (VOM)

0 = none

051= 5100 cfm

D= LCI (comm5) & VOM

A = remote minimum position

066= 6600 cfm

E = GBAS (0-5 VDC)

potentiomenter control BAYSTAT023*

Digit 8 – Unit voltage

F = GBAS (0-5 VDC) & VOM

Digit 20 – Dual setpoint sensor

G= VOM

3 = 230/60/3

0 = none

4

= 460/60/3

Digit 14 – Time clock

A = dual setpoint sensor

6

= 208/60/3

0 = none

Digit 21 – Dual setpoint sensor with system

A = time clock

Digit 9 – Roof curb

function

lights

0 = none

Digit 15 – Remote mounted human

0 = none

A = 14”

interface

A = dual setpoint sensor with system

B = 24”

0 = none

function

lights

C = acoustical

A = remote mounted human interface

D = 14” curb for unit w/ERV

B = remote mounted human interface with

Digits 22 – Space relative humidity kit

E = 24” extended for unit w/ERV

interprocessor

communication

bridge

0 = none

F

= 24” extended, acoustical for unit w/

module board kit

A = space relative humidity kit

ERV

C = interprocessor

communication

bridge

Digit 23 – Carbon dioxide sensor

module board kit

Digits 10, 11 – Design sequence

Digit 16 – Zone sensor

0 = none

A0 = design sequence

A = carbon dioxide sensor

0 = none

Digit 12 – Filter type

A = zone temperature sensor

Digit 24 – Dry-bulb duct sensor

0 = none

BAYSENS017*

0 = none

A = 2” pleated media

A = dry-bulb duct sensor

B = 2” cleanable

6	FAXA-SVX01B-EN

general Installation information

Unit Nameplate

The unit nameplate identifies the unit model number, appropriate service literature, and wiring diagram numbers. It is mounted on the control panel door. Reference this information when making inquiries or ordering parts or literature for the fresh air unit.

Unit mounted IntelliPak® microprocessor control with easy-to-read human interface

Horizontal or vertical discharge openings

Hi-rise electric (or gas) heat

1’’ Solid double-wall panels of foamed- in-place construction

Non-corrosive IAQ drain pan sloped in two directions

Optional condenser

Quiet FC fan reheat coil with modulating control

Figure I-GI-1. Packaged fresh air unit components

2’’ Pleated filter section with adjustable rack to 4’’

Standard protective bird screen on inlet hood

Traq® damper available for airflow measurement

Optional return air damper for unoccupied recirculation

All ship-with items are inside this compartment

FAXA-SVX01B-EN

7

pre-installation Installation considerations

Pre-Installation Considerations

Checklist

The following checklist is provided to give an overview of the factoryrecommended pre-installation considerations. Follow the procedures in this section to ensure the installation is complete and adequate for proper unit operation. Verify this checklist is complete before beginning unit installation.

οVerify the unit size and tagging with the unit nameplate to ensure the correct unit is received.

οInspect the unit for possible shipping damage and make any necessary claims with the freight delivery company immediately.

οBefore installing the roof curb, remember to allow minimum recommended clearances for routine maintenance and service. Refer to unit dimensions and clearances on submittals or in Dimensions and Weights section on page 15.

οVerify the unit roof curb is installed properly prior to beginning unit installation. See the Roof Curb Installation Manual, FAXA-SVN01B-EN.

οMake proper acoustic considerations before installing unit. Do not install unit above sound-senstive locations.

οAllow adequate space for service and operating clearances. Reference page 10.

οMake provisions for correct supply power and note electrical connection knockouts locations on the unit submittals or in the Dimensions and Weights section on page 15. This includes main power and dual power connections for electric heat.

Note: Verify electric stub-out within roof curb assembly, if using bottom electrical knockouts.

οElectrical supply power must meet specific balance and voltage requirements as described in the “Electrical Requirements” section on page 36.

οUnits with gas heat, ensure adequate gas service and piping is available at unit installation location.

οEnsure the unit installation location is level.

Receiving and Handling

Shipping Package

Packaged Fresh Air units ship fully assembled.

Ship-Separate Accessories

Field-installed sensors ship separately inside the unit’s filter/return air section. Units with gas heat have temporary panels in place for shipping. The permanent panels are located in this compartment and must be field-installed. Units with the total energy wheel option have an exhaust louver that ships inside the exhaust compartment. Install the louvers after installing the unit in its final position.

WARNING

No step surface!

Do not walk on the sheet metal drain pan. Walking on the drain pan can cause the supporting metal to collapse, causing death or serious injury.

8	FAXA-SVX01B-EN

pre-installation Installation considerations

Receiving Checklist

Complete the following checklist immediately after receiving unit shipment to detect possible shipping damage. If entry into the unit is necessary, bridge between the unit’s main supports using multiple 2 x 12 boards.

οVerify that the unit nameplate data corresponds to the sales order and bill of lading (including electrical data).

οVisually inspect the unit exterior for physical signs of shipping damage or material shortages.

οIf a unit appears damaged, inspect it immediately before accepting the shipment. Remove access panels and check for interiour component damage. Make specific notations concerning the damage on the freight bill. Do not refuse delivery.

οReport concealed damage to the freight line within the allotted time after delivery. Verify with the carrier what their allotted time is to submit a claim.

Note: Failure to follow these procedures may result in no reimbursement for damages from the freight company.

οDo not move damaged material from the receiving location. It is the receiver’s responsibility to provide reasonable evidence that concealed damage did not occur after delivery.

οDo not continue unpacking the shipment if it appears damaged. Retain all packaging. Take photos of damaged material if possible.

οNotify the carrier’s terminal of the damage immediately by phone and mail. Request an immediate joint inspection of the damage by the carrier and consignee.

οNotify your Trane representative of the damage and arrange for repair. Have the carrier inspect the damage before making any repairs to the unit.

Unit Storage

Isolate all side panel service entrances and base pan openings, such as conduit holes and supply and return air openings from the ambient air until the unit is ready for startup.

If relocating the unit is necessary after the initial delivery, position the unit on the open trailer so the inlet hood is facing the rear of the trailer.

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9

pre-installation Installation considerations

Service Access

Maintain adequate clearances around and above the fresh air unit to ensure proper unit operation and allow sufficient service access. See Figure I-PC-1 for recommended clearances. If installing the unit higher than the typical curb elevation, field-construct a catwalk around it to provide safe, easy maintenance access.

WARNING!

Hazardous voltage!

Disconnect electrical power source and remote disconnects before servicing unit. Follow proper lockout/ tagout procedures to ensure power cannot be inadvertently energized. Failure to do so may cause death or injury.

WARNING!

Disconnect gas supply!

Before servicing unit, FIRST turn off the gas supply. Failure to turn off the gas supply can cause death or serious injury.

WARNING!

Combustible materials!

Maintain proper clearance between the unit heat exchanger, vent surfaces, and combustible materials. Refer to this manual for proper clearances. Improper clearances can cause a fire hazard. Failure to maintain proper clearances can cause death, serious injury, or property damage.

unit without TE wheel

service access for removal of gas or electric heaters

air path into unit

condenser airflow and compressor maintenance

unit with TE wheel

service access for removal of

air path into

condenser airflow

Figure I-PC-1. Top view of fresh air unit showing recommended service and code clearances.

10	FAXA-SVX01B-EN

pre-installation Installation considerations

Roof Curb

You must install the roof curb before beginning unit installation. Reference the

Roof Curb Installation Manual, FAXA- SVN01B-EN for complete installation instructions. For reference, installation instructions are provided below. Reference roof curb dimensions in the Dimensions and Weights section on pages 15–32.

Note: Do not tighten any of the screws used to assemble this section until the curb has been leveled and squared in its installed location.

Roof Curb and Ductwork

Ensure the unit curb encloses the entire unit base area. It is referred to as a “full perimeter” type curb. Fabricate and install the supply air and return air ductwork adjoining the roof curb before the unit is set into place. Note electrical stub-ups within the curb.

General

Set the roof curb and Packaged Fresh Air unit level to ensure proper operation. If providing a field-fabricated roof curb, see page 12 for roof curb details for units without the total energy wheel option. See page 13 for units with the total energy wheel option. All installations must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code ANSI Z223.1.

Note: Trane has a roof curb specifically designed for the Packaged Fresh Air unit available in the following options: 14” or 24” height, and an acoustic curb. To install it, reference the Accessory Roof Curb Installation Manual, FAXA- SVN01B-EN.

Roof Support

The roof must be capable of adequately supporting the weight of the Packaged Fresh Air unit as well as the curb. See Figure I-IP-1 on page 40 for approximate unit four-corner weights.

Trane Roof Curb Installation

If the building is new, the curb may be assembled at any convenient location and installed as soon as the roof support members are in place. The curb must be mounted on the roof deck and support

provided directly below the flanges of the roof curb for further support and to minimize vibration. If the fresh air unit is to be installed on an existing building, hoist the curb shipping container to the roof, where the curb can be assembled more conveniently.

Standard Perimeter Curb Rail Assembly

Follow the procedure below as an example of how to field-assemble a field roof curb. This procedure also applies to the Trane standard 14” roof curb. Reference pages 12 & 13 for assembly drawings.

1.Attach corner angle (7) using 4 sheet metal screws to the end of end rail (1) adjacent to side rail (3). Place the clearance holes in the corner angle toward the top of the curb.

2.Attach end rail (1) to side rail (3) using 4 sheet metal screws.

3.Align side rail (4) next to side rail (3) and attach crossmember (11) perpendicular to both side rails at the joint using eight sheet metal screws.

4.Attach corner angle (8) using eight sheet metal screws to end rail (2) and side rail (4). Place the clearance holes in the corner angle toward the top of the curb.

5.Attach corner angle (9) using eight sheet metal screws to end rail (2) and side rail (5). Place the clearance holes in the corner angle toward the top of the curb.

6.Align side rail (6) next to side rail (5) and attach crossmember (11) perpendicular to both side rails at the joint using eight sheet metal screws.

7.Attach corner angle (10) using eight sheet metal screws to end rail (1) and side rail (6). Place the clearance holes in the corner angle toward the top of the curb.

Return and Exhaust Air Opening

Assembly

8.Place end rail (12) between side rail (3) and side rail (6) with flanges positioned away from the return air opening and attach it with two sheet metal screws at each end. Use rails (14), (15), (16), and (17) as spacers.

9.Place side rail (14) between end rail (1) and end rail (12) with flanges positioned away from the return air opening and attach it with two sheet metal screws at each end.

10.Place side rail (15) between end rail

(1)and end rail (12) with flanges positioned toward the return air opening and attach it with two sheet metal screws at each end.

11.Place side rail (16) between end rail

(1)and end rail (12) with flanges positioned away from side rail (15) and attach it with two sheet metal screws at each end.

12.Place side rail (17) between end rail

(1)and end rail (12) with flanges positioned away from the exhaust air opening and attach it with two sheet metal screws at each end.

Supply Air Opening Assembly

13.Place end rail (13) between side rail

(4)and side rail (5) with flanges positioned away from the supply air opening and attach it with two sheet metal screws at each end. Use rails (18) and (19) as spacers.

14.Place side rail (18) between end rail

(2)and end rail (13) with flanges positioned away from the supply air opening and attach it with two sheet metal screws at each end.

15.Place side rail (19) between end rail

(2)and end rail (13) with flanges positioned away from the supply air opening and attach it with two sheet metal screws at each end.

Units with the Total Energy Wheel Only

16.Attach corner angle (26) using five sheet metal scres to the side of duct support (25) without flanges. Place the clearance holes in the corner angle toward the top of the curb.

17.Align side rail (23) next to side rail (3) and attach crossmember assembly (25) and (26) perpendicular to both side rails at the joint using ten sheet metal screws.

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11

pre-installation Installation considerations

Standard roof curb assembly, units without TE wheel option

7

1

23

15

R/A

14

E/A

17

16

10	6

Note: Center lines connect corresponding holes in the rails and crossmember. All screws are installed from outside the curb.

corner angle

end rail

Typical std. curb corner assembly for units without the total energy wheel option

Curb legend
(1) end rail (R/A end)	(13) duct support end rail
(2) end rail (S/A end)	(14) duct support end rail (R/A end)
(3) side rail	(15) duct support side rail (R/A end)
(4) side rail	(16) duct support side rail (E/A end)
(5) side rail	(17) duct support side rail (E/A end)
(6) side rail	(18) duct support side rail (S/A end)
(7) corner angle	(19) duct support side rail (S/A end)
(8) corner angle	(20)	6” wood nailer; side
(9) corner angle	(21)	6” wood nailer; side
(10) corner angle	(22)	6” wood nailer; end
(11) crossmember	(23) 6” wood nailer; end
(12) duct support end rail
20

8

	3
12			4
			13
	11		S/A
		5	18
			19

22

21

2

9

side rails

side rail	return air end

supply air end supply air end

crossmember

Note: Center lines connect corresponding holes in the rails and crossmember. All screws are installed from outside the curb.

Typical std. curb rail and crossmember assembly for units without the total energy wheel option

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pre-installation Installation considerations

Standard roof curb assembly, units with the TE wheel

Curb legend
(1) end rail (R/A, E/A end)		(15)	duct support end rail
(2) end rail (S/A end)		(16)	duct support side rail (R/A end)
(3) side rail		(17)	duct support side rail (R/A end)
(4) side rail		(18)	duct support side rail (E/A end)
(5) side rail		(19)	duct support side rail (E/A end)
(6) side rail		(20)	duct support side rail (S/A end)
(7) corner angle		(21)	duct support side rail (S/A end)
(8) corner angle		(22)	crossmember
(9) corner angle		(23) side rail
(10)	corner angle	(24) side rail
(11)	crossmember	(25) duct support end rail
(12)	crossmember	(26)	corner angle
(13)	crossmember	(27)	corner angle
(14)	duct support end rail

GEND

side rail

corner angle

side rail

duct support end rail

Typical standard roof curb assembly for units with the TE wheel

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13

pre-installation Installation considerations

Acoustic Considerations

Before determining the final unit installation site, remember that proper unit placement is critical in reducing transmitting sound levels to the building. The ideal time to make provisions to reduce sound transmissions is during the design phase. The most economical means of avoiding a potential acoustical problem is to place units in areas that are not acoustically sensitive. Ideal locations are over over corridors, utility rooms, toilets, or other areas where higher sounds levels below the unit may be acceptable.

Follow these basic guidelines to help minimize sound transmission through the building structure:

•Locate the unit’s center of gravity close to or over a column or main support beam.

•If the roof structure is very light, replace roof joists using a structural shape in the critical areas described above.

Note: Cut applicable holes only for the supply, exhaust, and return duct penetration in the roof deck. To maintain roof integrity and prevent possible property damage, do not remove the roof decking from the inside perimeter of the curb.

Installation Preparation

Before installing the unit, perform the following procedures to ensure proper unit operation.

1.Verify the roof curb is level. To ensure proper unit operation, install the unit level (zero tolerance) in both horizontal axes. Failure to level the unit properly can result in condensate management problems, such as standing water inside the unit. Standing water and wet surfaces inside units can result in microbial growth (mold) in the drain pan that may cause unpleasant odors and serious health-related indoor air quality problem.

2.Allow adequate service and code clearances as recommended in “Service Access” section on page 10.

3.Position the unit and skid assembly in its final location. Test lift the unit to determine exact unit balance and stability before hoisting it to the installation location. See Figure I-IP-2 on page 41 for typical rigging procedures, including cautions and proper uses of such equipment as fork lifts, spreader bars, and hooks.

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Installation	dimensions
	& weights

Typical exterior dimensions, ft./in.

outdoor side view, unit without total energy wheel

outdoor side view, unit with total energy wheel

detail B

lifting hole detail A

CONTROL PANEL

END VIEW

inlet hood end view

control panel end view

unit size

A

B

C

D

E

F

G

H

J

K

L

M

N

P

without TE wheel

031, 041

18' - 10"

2' - 7" 4' - 2"

3' - 10"

—

3' - 2"

10"

9"

1' - 11 1/2"

1 1/4"

1' - 6 1’4"

ø 2

1/2"

—

—

051, 066

19' - 3"

3'

5' - 10"

4' - 1"

—

3' - 6"

1' - 3"

10 1’4"

2' - 4 1/2"

1 1/4"

3' - 6 3/4"

ø 3"

withTEwheel

031, 041

24' - 2"

2' - 7" 4' - 2"

3' - 10"

9 1/4"

3' - 2"

10"

9"

1' - 11 1/2"

1' 6"

1' - 6 1’4"

ø 2 1/2"

7"

1' - 3/4"

051, 066

24' - 7"

3'

5' - 10"

4' - 1"

8"

3' - 6"

1' - 3"

10 - 1’4"

2' - 4 1/2"

1' 8"

3' - 6 3/4"

ø 3"

7"

11"

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15

	dimensions
Installation	& weights

unit without TE wheel - indoor side view (electric heat version shown)

unit with TE wheel - indoor side view (electric heat version shown)

single & dual gas heater options

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Installation	dimensions
	& weights

Unit base plan view, duct openings & thru-base power openings, unit sizes 031 & 040

unit without TE wheel

unit with TE wheel

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17

	dimensions
Installation	& weights

Unit base plan view, duct openings & thru-base power openings, unit sizes 051 & 066

unit without TE wheel

unit with TE wheel

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Installation	dimensions
	& weights

Fresh air unit control panel detail, all unit sizes

detail A

3x

THRU-BASE MAIN POWER WIRING ENTRANCE

HOLE Ø3.000’’

NOTE: DRILL OR PUNCH HOLE IN COVER PLATE FOR

SMALLER CONDUIT CONNECTION

top view

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19

	dimensions
Installation	& weights

Exterior features for unit sizes 031 & 040, without TE wheel

CONDENSER FANS

CONVENIENCE OUTLET (OPTION)
LIFTING HOLES
			HORIZONTAL DISCHARGE
MAIN COMPRESSOR ACCESS PANEL			(OPTION)
(40x35)	MAIN CONDENSER		HUMAN INTERFACE
REHEAT COMPRESSOR/COIL ACCESS PANEL	COIL ACCESS		ACCESS DOOR
(34x36)	PANEL	(68x36)
			UNIT CONTROL PANEL
		MAIN POWER WIRING ENTRANCE
		(CAN ALSO BE RUN THRU-	24 VOLT CONTROL CIRCUIT WIRING ENTRANCE
		BASE)
			(CAN ALSO BE RUN THRU-BASE)

DUAL GAS HEAT ACCESS PANEL (EACH HEATER HAS SEPARATE PANEL)

(16x23)

INLET HOOD

GAS CONNECTION–DUAL GAS HEAT (EACH HEATER HAS SEPARATE GAS CONNECTIONS)

NATURAL GAS 250–400 MBH: Æ.500 NPT INTERNAL

		CONDENSATE	FILTER AND DAMPER ACCESS DOOR
		DRAIN CONNECTION
			(25x39)
	ELECTRIC HEAT POWER WIRING ENTRANCE
	(ALSO CAN BE RUN THRU-BASE)		EVAP COIL AND
	ELECTRIC HEATER ELECTRICAL PANEL (24x30)
			CONDENSATE DRAIN PAN
	-OR-		ACCESS DOOR (18x34)
	GAS HEAT PANEL (16x23)
	-OR-
	FIXED PANEL FOR NO-HEAT OPTION
	OR HYDRONIC HEAT INTERFACE OPTION (24x47)
	SUPPLY FAN ACCESS DOOR
20	(33X34)		FAXA-SVX01B-EN

Installation	dimensions
	& weights

Exterior features, unit sizes 031 & 040 with TE wheel

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21

	dimensions
Installation	& weights

Exterior features for unit sizes 051 & 066, without TE wheel

CONDENSER FANS

LIFTING HOLES

REHEAT COMPRESSOR/

COIL ACCESS PANEL (40x52)

MAIN COMPRESSOR/	MAIN COMPRESSOR/
COIL ACCESS PANEL (34x52)	COIL ACCESS PANEL
	(68x52)

CONVENIENCE OUTLET

(OPTION) MAIN POWER WIRING ENTRANCE (CAN ALSO BE RUN THRU-BASE)

HORIZONTAL DISCHARGE (OPTION)

HUMAN INTERFACE

ACCESS DOOR

UNIT CONTROL PANEL

24 VOLT CONTROL CIRCUIT WIRING ENTRANCE (CAN ALSO BE RUN THRU-BASE)

DUAL GAS HEAT ACCESS PANEL (EACH HEATER HAS SEPARATE PANEL)

(16x23)

GAS CONNECTION–DUAL GAS HEAT (EACH HEATER HAS SEPARATE GAS CONNECTIONS)

ELECTRIC HEAT POWER WIRING ENTRANCE FOR 208/230 V: 70, 84, 100, 122 kW (CAN ALSO BE RUN THRU-BASE)

ELECTRIC HEATER ELECTRICAL PANEL (24x49)

-OR-

SINGLE GAS HEAT ACCESS PANEL (16x23)

-OR-

FIXED PANEL FOR NO-HEAT OPTION

OR HYDRONIC HEAT INTERFACE OPTION (24x67)

GAS CONNECTION–SINGLE GAS HEATER

INLET HOOD

CONDENSATE DRAIN

CONNECTION

FILTER AND DAMPER ACCESS DOOR (25x59)

SUPPLY FAN ACCESS DOOR (33x54)

EVAP COIL & CONDENSATE DRAIN PAN ACCESS DOOR

(18x54)

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Installation	dimensions
	& weights

Exterior features for unit sizes 051 & 066 with TE wheel

FAXA-SVX01B-EN

23

	dimensions
Installation	& weights

Standard curb, unit sizes 031 & 040 without TE wheel

6’’ WOOD NAILER

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Installation	dimensions
	& weights

Standard roof curb, unit sizes 031 & 040 with TE wheel

6" WOOD NAILER

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25

	dimensions
Installation	& weights

Standard curb , unit sizes 051 & 66 without TE wheel

6’’ WOOD NAILER

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