Carrier 42S Series Dimensions and installation guide

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420017-01 Printed in U.S.A. Form 42S-4SI Pg 1 8-18 Replaces: 42S-3SI
Installation, Start-Up and Service
Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 2
Unpack and Inspect Units . . . . . . . . . . . . . . . . . . . . 2
Protect Units From Damage . . . . . . . . . . . . . . . . . . 2
Prepare Jobsite for Unit Installation . . . . . . . . . . . 3
Identify and Prepare Units. . . . . . . . . . . . . . . . . . . 13
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Step 1 — Place Units in Position . . . . . . . . . . . . . 13
• 42SG, SH, AND SJ UNITS
• 42SU UNIVERSAL ARRANGEMENT
• 42SM UNITS
Step 2 — Make Electrical Connections . . . . . . . . 22
• FACTORY-INSTALLED OPTIONS
• STANDARD WIRING PACKAGES
Step 3 — Make Duct Connections . . . . . . . . . . . . 23
Step 4 — Frame and Finish Unit . . . . . . . . . . . . . . 23
Step 5 — Cut Out Openings for Grilles and
Thermostats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Step 6 — Make Final Preparations . . . . . . . . . . . . 24
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Cooling/Heating System . . . . . . . . . . . . . . . . . . . . 25
Air System Balancing . . . . . . . . . . . . . . . . . . . . . . 26
Water System Balancing . . . . . . . . . . . . . . . . . . . . 26
Water Treatment. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Controls Operation . . . . . . . . . . . . . . . . . . . . . . . . 26
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Excessive Condensation on Unit . . . . . . . . . . . . . 26
To Clean Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Check Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Fan Motor Bearings . . . . . . . . . . . . . . . . . . . . . . . . 27
Clean Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Clean Electric Heater . . . . . . . . . . . . . . . . . . . . . . . 27
Electrical Wiring and Controls . . . . . . . . . . . . . . . 27
Valves and Piping . . . . . . . . . . . . . . . . . . . . . . . . . 27
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
APPENDIX A — BLOCK-OUT
CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . .29
APPENDIX B — POTENTIOMETER
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .32
APPENDIX C — EVO/ECM 4-SPEED
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .33
START-UP CHECKLIST FOR 42S SERIES
FAN COIL AIR CONDITIONERS . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation of this unit can be hazardous due to electrical
components and equipment location (such as an elevated
structure). Only trained, qualified installers and service me-
chanics should install and service this equipment.
See Fig. 1 for the Proposition 65 warning label.
CAUTION
When installing this unit, observe precautions in the liter-
ature, labels attached to the equipment, and any other
safety precautions that apply.
• Follow all safety codes.
• Wear safety glasses and work gloves. Never wear
bulky or loose fitting clothing when working on any
mechanical equipment. Gloves should be worn for
proper protection against heat and other possible inju-
ries. Safety glasses or goggles should always be worn
when drilling, cutting, or working with chemicals
such as refrigerants or lubricants.
• Use care in handling and installing this unit.
• Never pressurize any equipment beyond specified test
pressures. Always pressure-test with an inert fluid or
gas such as clear water or dry nitrogen to avoid possi-
ble damage or injury in the event of a leak or compo-
nent failure during testing. Always protect adjacent
flammable material when welding or soldering. Use a
suitable heat-shield material to contain sparks or drops
of solder. Have a fire extinguisher readily available.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or
death.
Before performing installation, service, or maintenance opera-
tions on unit, turn off main power switch to unit and install
lock(s) and lockout tag(s). Ensure electrical service to unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
42S Series
Fan Coil Air Conditioners

2
Fig. 1 — Proposition 65 Warning Label
INTRODUCTION
Carrier fan coil units represent a prudent investment offering
trouble-free operation and long service with proper installa-
tion, operation, and regular maintenance. Your equipment is
initially protected under the manufacturer’s standard warran-
ty; however, this warranty is provided under the condition
that the steps outlined in this manual for initial inspection,
proper installation, regular periodic maintenance, and every-
day operation of the equipment be followed in detail. This
manual should be fully reviewed in advance before initial in-
stallation, start-up, and any maintenance. Should any ques-
tions arise, please contact your local sales representative or
the factory BEFORE proceeding.
This document contains general installation instructions for
the 42S unit fan coils. Refer to the unit wiring diagram in-
stalled on the blower housing or specific manufacturer litera-
ture for any other type of factory-mounted controls.
See drawings for unit configurations, dimensions, clearances,
and pipe connections. Refer to unit wiring label for all electri-
cal connections; follow NEC (National Electrical Code) and
local codes.
PHYSICAL DATA
Component weight data, shipping weights, and filter data of
the 42S units are provided in Table 1.
PRE-INSTALLATION
Unpack and Inspect Units
All units are carefully inspected at the factory throughout the
manufacturing process under a strict detailed quality assur-
ance program, and, where possible, ALL major components
and sub-assemblies are carefully tested for proper operation
and verified for full compliance with factory standards. Oper-
ational testing of some customer-furnished components such
as electronic control valves and digital controllers may be a
possible exception.
Each unit is carefully packaged for shipment to avoid damage
during normal transit and handling. Equipment should always
be stored in a dry place, and in the proper orientation as
marked on the carton. All shipments are made from factory
FOB and are the responsibility of the receiving party to in-
spect the equipment upon arrival. Any obvious damage to the
carton and/or its contents should be recorded on the bill of
lading and a claim should be filed with the transportation
company, and Carrier should be advised. After determining
the condition of the carton exterior, carefully remove each
unit from the carton and inspect for hidden damage. At this
time, check to make sure that “furnished only” items such as
thermostats, grilles etc. are accounted for whether packaged
separately or shipped at a later date. Any hidden damage
should be recorded and immediately reported to the transpor-
tation company, a claim should be filed with the transporta-
tion company, and Carrier should be notified. In the event a
claim for shipping damage is filed, the unit, shipping carton,
and all packing must be retained for physical inspection by
the transportation company. All equipment should be stored
in the factory shipping carton with internal packing in place
until installation.
At the time of receipt, the equipment type and arrangement
should be verified against the order documents. Should any
discrepancy be found, the local sales representative should be
notified immediately so that proper action may be taken.
Should any questions arise concerning warranty repairs, the
factory must be notified BEFORE any corrective action is
taken. Where local repairs or alterations can be accom-
plished, the factory must be fully informed of the extent and
expected cost of those repairs before work is begun. Where
factory operations are required, the factory must be contacted
for authorization to return equipment and a Return Authoriza-
tion Number will be issued. Unauthorized return shipments of
equipment and shipments not marked with an authorization
number will be refused. In addition, any claims for unautho-
rized expenses will not be accepted by the manufacturer.
Protect Units from Damage
All equipment is designed and fabricated with robust materi-
als and presents a rugged appearance. Still, great care must be
taken to assure that no force or pressure is applied to the coil,
risers, or piping during handling. Never use the risers to lift
the unit. Also, depending on the options and accessories,
some units could contain delicate components that may be
damaged by improper handling. Lifting or supporting the
cabinet only at the top and bottom should be avoided to main-
tain the straight and square cabinet alignment. The unit must
be lowered into the space taking care to properly align the ris-
ers to engage the riser swaged section on the unit below. The
risers should never be bent or pushed together to be passed
through the floor slot and should never be lifted up or pulled
down to meet the risers on the floor below or above. The ris-
ers are designed with a 3-in. swage to accommodate a 2-in.
overlap and minor floor to floor variations.
This product can expose you to chemicals
including Acrylamide, which is known to the
State of California to cause cancer and birth
defects or other reproductive harm.
For more information, go to
www.P65Warnings.ca.gov
WARNING
!
!
!
AVERTISSEMENT
ADVERTENCIA
Ce produit peut vous exposer à des produits
chimiques, y compris l’acrylamide, qui est
connu dans l’État de Californie pour causer
le cancer et des malformations congénitales
ou d’autres problèmes de reproduction. Pour
de plus amples informations, prière de
consulter www.P65Warnings.ca.gov
Este producto puede exponerlo a productos
químicos como la acrilamida, que en el
estado de California es causante de cáncer
y defects de nacimiento u otros daños
reproductivos. Para mayor información, visite
www.P65Warnings.ca.gov
343839-101 REV.A

3
The equipment must always be properly supported. Tempo-
rary supports used during installation or service must be ade-
quate to hold the equipment securely. Equipment should al-
ways be stored in the proper orientation as marked on the car-
ton. To maintain warranty, protect units against hostile
environment (such as rain, snow, or extreme temperatures),
theft, vandalism, and debris on jobsite. Equipment covered in
this manual is not suitable for outdoor installations. Do not al-
low foreign material to fall into drain pan. Prevent dust and
debris from being deposited on motor, fan wheels and cool-
ing/heating coils. Failure to do so may have serious adverse
effects on unit operation, and in the case of the motor and
blower assembly, may result in immediate or premature fail-
ure. Manufacturer's warranty is void if foreign material is al-
lowed to be deposited on the motor or blower wheels of any
unit. Some units and/or job conditions may require some
form of temporary covering during construction.
Prepare Jobsite for Unit Installation
To save time and to reduce the possibility of costly errors, set
up a complete sample installation in a typical room at jobsite.
Check all critical dimensions such as pipe, wire, and duct
connection requirements. Refer to job drawings and product
dimension drawings as required (see Fig. 2-11). Instruct all
trades in their part of the installation.
Table 1 — Physical Data — 42S Series Units
*Calculate Operating Weight of Unit: Shipping Weight + Coil Water Weight x Number of Coil Rows.
†42SJ units require two filters.
UNIT SIZE 42S 03 04 06 08 10 12 14 16 20
NOMINAL AIRFLOW (cfm) 300 400 600 800 1000 1200 1400 1600 2000
SHIPPING WEIGHT (lb)*
42SGA,SGM,SU 180 225 240 260 280 305 — — —
42SH 202 247 262 286 311 336 — — —
42SJ 360 450 480 520 560 610 — — —
42SGS 162 203 216 234 252 275 — — —
42SM ——————390390390
COILS
FPI 14 fins/inch
BLOWER (qty)
42SGA,SH,SU,SGM,SGS,SM 11111111 1
42SJ 222222———
FILTERS
Nominal Size (in.) (1-in. thick) 121/2x 241/4161/4x 263/4201/2x 291/4241/2x 291/2261/2x 291/2
Qty 1†
PIPING CONNECTIONS
Inlet (in. OD) 1/2, unless larger size valve package is selected

4
Fig. 2 — 42SGA Furred-In Stack Dimensions
†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
NOM
AIRFLOW
(CFM)
DIMENSIONS (in.) UNIT
WEIGHT†
(lb)
Single Supply Double Supply TOP Supply EGH I
AB A BCD
03 300 14 8 14 6 14 10 17 11/211/214 180
04 400 14 12 14 6 14 10 17 11/211/214 225
06 600 18 10 18 6 16 12 20 1 2 18 240
08 800 18 12 18 6 16 12 20 1 2 18 260
10 1000 — — 22 8 18 16 24 1 3 22 280
12 1200 — — 22 8 18 16 24 1 3 22 305
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D— Drain
HR — Hot Water Return
HS — Hot Water Supply
R— Return
S—Supply
**Factory-Installed.
††Field-Installed.
ITEM DESCRIPTION QTY
1Electrical Knockouts 1
23-in. Expanded Section 3/5
3Strip Heater (Optional) 1
4Limit Switch**†† (Optional) 1
51/2-in. Isolation Ball Valves** 2/4
6Flexible Drain Tube/P-Trap 1
7Coil 1/2-in. OD Copper Tube 1
8Filter, Throwaway, 1-in.** 1
9Return Air Opening 1
10 Air Vent, Manual 1
11 Molex Connector for Field-Installed Stat 1
12 Control Box 1
13 Knockout (For Optional Remote Mounting) 2
14 Riser, Supply and Return (Copper) 2/4
15 Riser, Drain (Copper) 1
16 Drain Pan 1
17 Acoustical Bypass Panel 1
18 Blower 1
19 Motor, 3-Speed, PSC, with Quick Connect 1
20 Access Panel (Control Box) 1
21 Control Opening (Surface Mount Stat) 1
22 Duct Collar, 1/2-in. Extension (Typical) 1/2/3
23 Supply Air Opening(s) 1/2/3
24 Top Supply Collar 1-in Extension
(Optional) 1
*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with (1/2-in. or 3/4-in. thick) closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated.
7. Riser length = [(floor to floor) +2-in.], maximum riser length = 119-in.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.
24

5
Fig. 3 — 42SHA Cabinet Dimensions
†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
NOM
AIRFLOW
(CFM)
DIMENSIONS (in.)
UNIT
WEIGHT†
(lb)
SINGLE
SUPPLY
DOUBLE
SUPPLY CDEFG
ABAB
03 300 14 8 14 6 17 223/821/2221/8143/4202
04 400 14 12 14 8 17 223/821/2221/8143/4247
06 600 14 12 14 8 20 253/821/2265/8173/4262
08 800 14 16 14 10 20 253/821/2265/8173/4286
10 1000 18 16 14 12 24 293/821/2311/8173/4311
12 1200 18 16 14 12 24 293/821/2311/8173/4336
*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck, painted with Arctic White.
2. Risers are piped to coil with valves as specified.
3. Blower, motor, valves, coil, and filter are accessible through the return air opening.
4. Unit and control box are insulated.
5. Riser length = [(floor to floor) +2-in.], maximum riser length = 119-in.
6. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
7. Expansion loops in hot water heating circuits as required.
8. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion and
contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
9. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
10. 42SHA available in front return only.
11. All dimensions are in inches.
**Factory-Installed.
††Field-Installed.
ITEM DESCRIPTION QTY
1Full Riser Chase 1
2Electrical Knockouts 1
33-in. Expansion Section 3/5
4Strip Heater (Optional) 1
5Limit Switch**†† (Optional) 1
61/2-in. Isolation Ball Valves** 2/4
7Flexible Drain Tube/P-Trap 1
8Drain Pan 1
9Coil 1/2-in. OD Tube 1
10 Filter, Throwaway, 1-in.** 1
11 Air Vent, Manual 1
12 Control Box 1
13 Cabinet Camloc® Fasteners 2
14 3-Speed Switch (Optional) 1
15 Electrical Access Panel 1
16 Riser, Supply and Return (Copper) 2/4
17 Riser, Drain (Copper) 1
18 Return Air Panel 1
19 Motor, 3-Speed, PSC 1
20 Blower 1
21 Thermostat (Optional) 1
22 Hinged Control Access Door 1
23 Double Deflection Steel Core Grille Assembly 1
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D— Drain
HR — Hot Water Return
HS — Hot Water Supply
R— Return
S—Supply
23
22
21
20
19

6
Fig. 4 — 42SJ Back-to-Back Furred-In Stack Dimensions
†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
NOM
AIRFLOW
(CFM)
DIMENSIONS (in.)
UNIT
WEIGHT†
(lb)
SINGLE
SUPPLY
DOUBLE
SUPPLY TOP SUPPLY EG H I J
ABA BCD
03 300 14 8 14 6 14 10 17 11/211/214 395/8360
04 400 14 12 14 6 14 10 17 11/211/214 395/8450
06 600 18 10 18 6 16 12 20 1 2 18 455/8480
08 800 18 12 18 6 16 12 20 1 2 18 455/8520
10 1000 ——22 81816241 32253
5/8560
12 1200 ——22 81816241 32253
5/8610
*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated.
7. Riser length = [(floor to floor) +2-in.], maximum riser length = 119-in.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.
**Factory-Installed.
††Field-Installed.
ITEM DESCRIPTION QTY
1Electrical Knockouts 6
2Gypsum Board, 5/8-in. Type “X” 1
33-in. Expanded Section 3/5
4Strip Heater** (Optional) 2
5Limit Switch**†† (Optional) 2
61/2-in. Isolation Ball Valves** 4/8
7Thermafiber Insulation 2
8Flexible Drain Tube/P-Trap 2
9Coil 1/2-in. OD Copper Tube 2
10 Filter, Throwaway, 1-in.** 2
11 Return Air Opening 2
12 Air Vent, Manual 2
13 Knockout (For Optional Remote
Mounting) 2
14 Molex Connector for Field Installed Stat 2
15 Control Box 2
16 Riser, Drain (Copper) 1
17 Riser, Supply and Return (Copper) 2/4
18 Drain Pan 2
19 Return Air Blockoff Panel (Optional) 1
20 Blower 2
21 Motor, 3-Speed, PSC, with Quick Connect 2
22 Access Panel (Control Box) 2
23 Control Opening (Surface Mount Stat) 2
24 Duct Collar, 1/2-in. Extension (Typical) 1/2/3
25 Supply Air Opening(s) 1/2/3
26 Top Supply Duct Collar, 1-in. Extension
(Optional) 1
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D—Drain
HR — Hot Water Return
HS — Hot Water Supply
R—Return
S—Supply
SJA
4-PIPE
OPTION
HR
HS
D
CR
CS
3(76)
3(76)
3-5/8(92)
3-5/8(92)*
3(76)
25
24
23
22
21
20
19
18
17
16
I
E
1 (25)
15
14
13
12
11
10
9
85 (127)
63
(1600) 54
(1372)
E
J
Rise Length
(NOTE7)
88
2558
SIDE VIEW
4
5
6
A
G
3
B
3(76)
2
1
1-1/4
(32)
D
H
TOP VIEW CSJA
H
R
D
S
SJB
FRONT VIEW
26
C
L
7

7
Fig. 5 — 42SGM Furred-In Master Stack Dimensions
†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
NOM
AIRFLOW
(CFM)
DIMENSIONS (in.)
UNIT
WEIGHT†
(lb)
SINGLE
SUPPLY
DOUBLE
SUPPLY
TOP
SUPPLY EGH I
AB A BCD
03 300 14 8 14 6 14 10 17 11/211/214 180
04 400 14 12 14 6 14 10 17 11/211/214 225
06 600 18 10 18 6 16 12 20 1 2 18 240
08 800 18 12 18 6 16 12 20 1 2 18 260
10 1000 ——22 81816241 322 280
12 1200 ——22 81816241 322 305
**Factory-Installed.
††Field-Installed.
ITEM DESCRIPTION QTY
1Electrical Knockouts 1
23-in. Expanded Section 3/5
3Strip Heater** (Optional) 1
4Limit Switch**†† (Optional) 1
51/2-in. Isolation Ball Valves** 2/4
6Flexible Drain Tube/P-Trap 1
7Coil 1/2-in. OD Copper Tube 1
8Filter, Throwaway, 1-in.** 1
9Return Air Opening 1
10 Air Vent, Manual 1
11 Knockout (For Optional Remote Mounting) 2
12 Molex Connector for Field-Installed
Thermostat 1
13 Control Box 1
14 Riser, Supply and Return (Copper) 2/4
15 Riser, Drain (Copper) 1
16 Drain Pan 1
17 Acoustical Bypass Panel 1
18 Blower 1
19 Motor, 3-Speed, PSC, with Quick Connect 1
20 Access Panel (Control Box) 1
21 Control Opening (Surface Mount Thermostat) 1
22 Duct Collar, 1/2-in. Extension (Typical) 1/2/3
23 Supply Air Opening(s) 1/2/3
24 Top Supply Duct Collar, 1-in. Extension
(Optional) 1
*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated.
7. Riser length = [(floor to floor) +2-in.], maximum riser length = 119-in.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.
24
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D—Drain
HR — Hot Water Return
HS — Hot Water Supply
R—Return
S—Supply

8
Fig. 6 — 42SGS Furred-In Slave Stack Dimensions
*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated.
7. Riser length = [(floor to floor) +2-in.], maximum riser length = 119-in.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion and con-
traction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.
†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
NOM
AIRFLOW
(CFM)
DIMENSIONS (in.)
UNIT
WEIGHT†
(lb)
SINGLE
SUPPLY
DOUBLE
SUPPLY TOP SUPPLY EGH I
ABABCD
03 300 14 8 14 6 14 10 17 11/211/214 162
04 400 14 12 14 6 14 10 17 11/211/214 203
06 600 18 10 18 6 16 12 20 1 2 18 216
08 800 18 12 18 6 16 12 20 1 2 18 234
10 1000 — — 22 8 18 16 24 1 3 22 252
12 1200 — — 22 8 18 16 24 1 3 22 275
**Factory-Installed.
††Field-Installed.
ITEM DESCRIPTION QTY
1Electrical Knockouts 1
2Strip Heater** (Optional) 1
3Limit Switch**†† (Optional) 1
41/2-in. Isolation Ball Valves** 2/4
5Coil Stub Outs 2/4
6Shipping Brace 2/4
7Flexible Drain Tube/P-Trap 1
8Coil 1/2-in. OD Copper Tube 1
9Filter, Throwaway, 1-in.** 1
10 Return Air Opening 1
11 Air Vent, Manual 1
12 Knockout (For Optional Remote Mounting) 2
13 Molex Connector for Field-Installed Stat 1
14 Control Box 1
15 Drain Pan 1
16 Return Air Blockoff Panel (Optional) 1
17 Blower 1
18 Motor, 3-Speed, PSC, with Quick Connect 1
19 Access Panel (Control Box) 1
20 Control Opening (Surface Mount
Thermostat) 1
21 Duct Collar, 1/2-in. Extension (Typical) 1/2/3
22 Supply Air Opening(s) 1/2/3
23 Top Supply Duct Collar 1-in. Extension
(Optional) 1
23
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D—Drain
HR — Hot Water Return
HS — Hot Water Supply
R—Return
S—Supply

9
Fig. 7 — 42SU Universal Furred-In Stack Dimensions
*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
UNIT
WEIGHT*
(lb)
DIMENSIONS (in.)
FILTER SIZE
(in.)
SIDE SUPPLY TOP SUPPLY
A B SIZE C D SIZE E F H I
03 180 14 12 14 x 12 14 10 14 x 10 17 3 11/214 121/2x 241/4x 1
04 225
06 240 18 12 18 x 12 16 12 16 x 12 20 1 2 18 161/4x 263/4x 1
08 260
10 280 22 16 22 x 16 18 16 18 x 16 24 1 3 22 201/2x 291/4x 1
12 305
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. Thermostats shipped loose for field connection.
3. Blower, motor, valves, coil, and filter are accessible through the return air opening.
4. Unit and control box are insulated with 1/2-in. (13 mm) coated fiberglass insulation.
5. All risers will ship separately from units. Riser dimensions are measured from centerline of knockout.
6. Drain knockouts on three sides of cabinet.
7. Flex hoses ship with unit.
8. Thread fittings on both ends of flex hoses must be field tightened and leak tested.
9. Return air panel not shown.
10. All dimensions are in inches (mm).
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D—Drain
HR — Hot Water Return
HS — Hot Water Supply
PSC — Permanent Split Capacitor
SWT — Sweat
ITEM DESCRIPTION QTY
1Float Switch (Optional) 1
2Drain Pan 1
3Flexible Drain Tube/P-Trap 1
4Drain Knockout (3 Sides) 1 each
side
5Blower 1
6Riser Knockouts (3 Sides) 2/4
71/2-in. Flare Adaptor (SWT x 37.5) 2/4
8Coil, 1/2-in. OD Copper Tube 1
91 in. Throwaway Filter
(Factory Installed) 1
10 Manual Air Vent 1
11 Return Air Opening 1
12 Knockout (For Optional Thermostat
Remote Mounting) 3
13 Molex Connector for Field-Installed
Thermostat 1
14 Control Box 1
15 Duct Collar Extension
(1/2-in. Side, 1-in. Top) 1/2/3
16 Outside Air Knockout
(On Each Side Panel) 1
17 Electrical Knockouts
(Near Each Side) 1
18 Service Switch (Optional) 1
19 Motor, 3-Speed, PSC, with Quick
Connect 1
20 Access Panel for Motor and Blower
Assembly 1
21 Access Panel (Control Box) 1
22 Control Opening Knockout
(Surface Mount Thermostat) 1
23 Supply Air Openings
(4 Sides and Top, Stitch Cut) 1/2/3
8
(203)
51
(1295)
I
E
19
8
14
23 15
22
10
11
9
3
5
2
E
63
(1600)
21
12
13
17
7
6
16
A
B
F
39
(991)
5
(127)
1-1/4
(32)
4
(102)
88
(2235)
H
R
H
S
C
R
C
S
D
1-1/4
(32)
HCH
HR CR CSHS D
3-5/8
(92)
3-5/8
(92)
3
(76)
3
(76)
4
1-1/4
(32)
20
18
1
DETAIL SIDE VIEW
TOP VIEW
FRONT VIEW SIDE VIEW

10
Fig. 8 — 42SU Universal Furred-In Stack with Heater Dimensions
*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
UNIT
SIZE
UNIT
WEIGHT*
(lb)
DIMENSIONS (in.) FILTER SIZE
(in.)
SIDE SUPPLY TOP SUPPLY
AB SIZE CD SIZE EFH I
03 182 14 12 14 x 12 14 10 14 x 10 17 3 11/214 121/2x 241/4x 1
04 227
06 242 18 12 18 x 12 16 12 16 x 12 20 1 2 18 161/4x 263/4x 1
08 262
10 282 22 16 22 x 16 18 16 18 x 16 24 1 3 22 201/2x 291/4x 1
12 307
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. Thermostats shipped loose for field connection.
3. Blower, motor, valves, coil, and filter are accessible through the return air opening.
4. Unit and control box are insulated with 1/2-in. (13 mm) coated fiberglass insulation.
5. All risers will ship separately from units. Riser dimensions are measured from centerline of
knockout.
6. Drain knockouts on three sides of cabinet.
7. Flex hoses ship with unit.
8. Thread fittings on both ends of flex hoses must be field tightened and leak tested.
9. Return air panel not shown.
10. All dimensions are in inches (mm).
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D—Drain
HR — Hot Water Return
HS — Hot Water Supply
PSC — Permanent Split Capacitor
SWT — Sweat
6
5
8
(203)
51
(1295)
I
E
21
10
16
25 17
24
12
13
11
3
7
2
E
63
(1600)
23 14
15
19
9
8
18
A
B
F
39
(991)
5
(127)
1-1/4
(32)
4
(102)
88
(2235)
H
R
H
S
C
R
C
S
D
1-1/4
(32)
HCH
HR CR CSHS D
3-5/8
(92)
3-5/8
(92)
3
(76)
3
(76)
4
1-1/4
(32)
1
22
20
TOP VIEW
FRONT VIEW SIDE VIEW
DETAIL SIDE VIEW
ITEM DESCRIPTION QTY
1Float Switch (Optional) 1
2Drain Pan 1
3Flexible Drain Tube/P-Trap 1
4Drain Knockout (3 Sides) 1 each
side
5Limit Switch (Factory Installed) 1
6Strip Heater 1
7Blower 1
8Riser Knockouts (3 Sides) 2/4
91/2-in. Flare Adapter (SWT x 37.5) 2/4
10 Coil, 1/2-in. OD Copper Tube 1
11 1-in. Throwaway Filter
(Factory Installed) 1
12 Manual Air Vent 1
13 Return Air Opening 1
14 Knockout (For Optional
Thermostat Remote Mounting) 3
15 Molex Connector for
Field-Installed Thermostat 1
16 Control Box 1
17 Duct Collar Extension
(1/2-in. Side, 1-in. Top) 1/2/3
18 Outside Air Knockout
(On Each Side Panel) 1
19 Electrical Knockouts
(Near Each Side) 1
20 Service Switch (Optional) 1
21 Motor, 3-Speed, PSC,
with Quick Connect 1
22 Access Panel for Motor and Blower
Assembly 1
23 Access Panel (Control Box) 1
24 Control Opening Knockout
(Surface Mount Thermostat) 1
25 Supply Air Openings
(4 Sides and Top, Stitch Cut) 1/2/3

11
Fig. 9 — 42SM Mega Furred-In Stack Dimensions
NOTES:
1. Unit measurements on drawings are shown in inches (millimeters).
2. Units are fabricated of galvanized steel with a 16 gage galvanized fan deck.
3. Blower, motor, valves, coil, and filter are accessible through the return air opening.
4. Unit and control box are insulated with 1/2-in. (13 mm) coated fiberglass insulation.
5. Maximum riser size is 21/2-in. (64 mm) diameter. If larger sizes are required, please
consult the factory.
6. This drawing is pictorial. (See unit arrangements for actual supply and return air
orientation.)
7. Riser length = [floor to floor + 2-in. (51 mm)]. Maximum riser length is 119-in.
(3023 mm).
8. Unit shipping weight is approximately 390 lb (176 kg).
LEGEND
CR — Cold Water Return
CS — Cold Water Supply
D—Drain
HR — Hot Water Return
HS — Hot Water Supply
PSC — Permanent Split Capacitor
SWT— Sweat
30
(762)
28
(711)
SWT X 37.5
FLARE
ADAPTER
ACOUSTICAL
SERVICE
ACCESS PANEL
FLEXIBLE
DRAIN
TUBE/P-TRAP
FILTER
RISER
KNOCKOUTS (OPTIONAL)
RETURN AIR
PANEL
DRAIN PAN
SUPPLY AIR
OPENING
CONTROL BOX
COIL
MOTOR/BLOWER,
3 SPEED, PSC,
HIGH STATIC
24
(610)
5
(127)
66*
(1676)
59
(1499)
39
(991)
SUPPLY
TOP DUCT
COLLAR, 1"(25)
(OPTIONAL)
INTERLOCKING
DISCONNECT
SWITCH
ELECTRICAL
KNOCKOUTS
5
(127)
3
(76) 3
(76)
DHS CR 1-1/4
(32)
3
(76)
11
(280)
24
(610)
3
(76)
3
(76)
3-5/8
(92)
3-5/8
(92) DHS CSCRHR 1-1/4
(32)
3
(76)
11
(280)
24
(610)
SUPPLY PLENUM
(OPTIONAL)
22
(559)
422
(559)
4 (102) 4 (102)
4-3/4 (121)
16
(406)
4-3/4 (121)
16
(406)
1 (25) 22
(559) 1 (25)
4-PIPE 2-PIPE

12
Fig. 10 — Return-Air Wall Panels for Furred-In Units — Panels with No Frame Dimensions
PANEL DIMENSIONS (in.)
NOTE: Dimensions in inches.
PANEL
NO. UNIT UNIT SIZE A
1
42SG,SJ,
SU
03, 04 15.5
06, 08 19.5
10, 12 23.5
42SM 14,16,20 29.5
242SG,SJ
03, 04 15.5
06, 08 19.5
10, 12 23.5
342SG,SJ
03, 04 15.2
06, 08 19.2
10, 12 23.2
PANEL NO. 1
55.5
A
PANEL NO. 3
55.3
A
PANEL NO. 2 WITHOUT DOOR
61.1
A
PANEL NO. 1 FOR 42SU
52.5
A
PANEL NO. 1 FOR 42SM
60.5
A
PANEL NO. 2
61.1
A

13
Fig. 11 — Return-Air Wall Panels for Furred-In Units — Panels with Frame Dimensions
Identify and Prepare Units
Be sure power requirements match available power source.
Refer to unit nameplate and wiring diagram.
1. Check all tags on unit to determine if shipping screws or
braces are to be removed. Remove screws as directed.
2. Rotate the fan wheel by hand to ensure that the fan is
unrestricted and can rotate freely. Check for shipping
damage and fan obstructions. Adjust blower motor as
required.
NOTE: When optional factory-installed risers are ordered, see
Appendix A on page 29 for block-out construction dimensions.
INSTALLATION
Step 1 — Place Units in Position
A factory tag is on top of each unit. The tag states riser tier
number, floor, room number (if furnished), and supply-air ar-
rangement. Check unit for any other labels that apply to in-
stallation. Units should not be installed at locations other than
that marked on the unit identification tag. If no specific detail
is shown on tag for unit location, then determine configura-
tion for the Universal unit based on information within this
manual. Should any questions arise regarding unit configura-
tion, contact the sales representative or the factory BEFORE
proceeding. Remove unit from pallet and take directly to as-
signed space for installation. While all equipment is designed
and fabricated with sturdy materials and may present a rug-
ged appearance, great care must be taken to assure that no
force or pressure be applied to the coil, risers or piping during
PANEL AND FRAME DIMENSIONS (in.)
NOTE: Dimensions in inches.
PANEL NO. UNIT UNIT SIZE A
442SG,SJ,
SU
03, 04 15.1
06, 08 19.1
10, 12 23.1
542SG,SJ
03, 04 15.1
06, 08 19.1
10, 12 23.1
PANEL NO. 4
54.7
A
PANEL NO. 5 WITH CONTROL DOOR
60.4
A
PANEL NO. 5 WITHOUT DOOR
60.4
A
PANEL NO. 4 FOR 42SU
51.7
A

14
handling. Never use the riser to lift the unit. To maintain the
straight and square cabinet alignment, avoid lifting or sup-
porting the cabinet only at the top and bottom.
While the manufacturer does not become involved in the de-
sign and selection of support methods and components, it
should be noted that unacceptable system operating charac-
teristics and/or performance may result from improper or in-
adequate unit structural support. Due to variations in building
construction, floor plans, and unit configurations, each instal-
lation is different. The actual step-by-step method of installa-
tion may vary from unit to unit. However, the risers should be
moved as little as possible to avoid damage to the unit and in-
ternal components.
42SG, SH, AND SJ UNITS
1. Begin on lowest floor and progress upward, floor by
floor, to top.
2. Examine drain line (Fig. 2-6). Be sure both ends are in
place and that it forms a trap. Avoid pinching drain line.
3. Tip unit over riser hole in building floor. As unit is
righted, align riser with unit below.
NOTE: The unit must be lowered into the space, taking care to
properly align the risers to engage the riser swaged section on the
unit below. The riser should never be bent or pushed together to
be passed through the floor slot and should never be lifted up or
pulled down to meet the riser on the floor below or above.
4. Install isolator pads beneath the four corners of unit if
applicable.
5. Before anchoring the equipment in place, the unit must
be leveled, and the cabinet must be squared and brought
into line with any adjacent or included walls. The unit
may be anchored in place by bolting directly through the
unit floor or attaching to the cabinet in some location that
will not interfere with drywall or other items such as the
supply grille, thermostat, or return access panel. When
attaching to the unit cabinet, care must be taken to not
penetrate the cabinet in locations that may damage inter-
nal components or wiring. The mounting technique is a
matter of choice; however, the unit should always be
anchored securely to prevent movement during construc-
tion and riser expansion and contraction. On certain
units, shipping screws or braces must be removed after
the unit is installed. Be sure to check all tags on the unit
to determine which, if any, of these devices need to be
removed.
6. If installing a 42SJ unit, follow steps a-h. For 42SG and
42SH units, continue to Step 7.
NOTE: The 42SJ back-to-back fan coils have been designed to
serve two separate rooms. These products are classified by Un-
derwriters Laboratories Inc. for use in penetration firestop sys-
tems, control number 27WL when ordered with 1-hr rated chase.
See UL Fire Resistance Directory for more information. Figure
12 shows the 42SJ unit with standard risers and with Siamese
risers.
a. Lay out the control lines for the drywall track and
studs in the floor and ceiling (see Fig. 13).
NOTE: Tracking may be installed now or after the unit is set.
b. Position the 42SJ fan coil assembly between two
rooms with the unit drywall separation spotted over
the wall control lines.
Fig. 12 — 42SJ Unit with Standard and Siamese
Risers
Fig. 13 — 42SJ Wall Board Installation
c. If not already installed, install the floor and ceiling
tracks up to and over the 42SJ fan coil unit.
d. Position the vertical studs and fasten into each of the
stud pockets formed into the chase side panels (see
Fig. 13).
NOTE: The studs may be mechanically fastened to the 42SJ fan
coil. Care should be taken, however, not to penetrate the supply
or return water risers or internal piping. Given the levelness of
the floor and/or the fan coil assembly, some shimming may be
necessary.
e. Assemble the specified wall construction up to and
over the top of the fan coil unit (see Fig. 14).
f. With the fire-wall separation being complete, the
drywall skin on the surface of the individual fan
coils can be applied. Drywall can be applied directly
to the surface, or, if necessary, studding may be
installed on the corners for vertical control (see Fig.
14).
g. For ease of installation of the access panel, apply
drywall on the return-air side directly to the surface
of the unit (see Fig. 14). When applying the wall
board directly to the unit cabinet, it may be neces-
sary to shim the wall board in some areas to achieve
the desired finished wall surface.
h. After all drywalling and painting is complete, install
thermostats, supply air grilles and return air panels.
42SJB
42SJA
42SJB
42SJA
INSTALL WALL
STUD INTO
POCKET
FORMED BY
CHASE SIDE
PANEL
CHASE
SIDE
PANEL
DRYWALL
TRACK AND
STUD
CONTROL
LINES
INSTALL STUDSFROM TOP OF
UNIT TO CEILING (4 CORNERS)

15
Fig. 14 — 42SJ Unit Installation
7. Attach unit risers:
NOTE: Submittals and product literature detailing unit opera-
tion, controls, and connections should be thoroughly reviewed
BEFORE beginning the connection and testing of risers and pip-
ing. The supply and return connections are marked on the coil
stub-outs and the valve package with an “S” meaning supply or
inlet and “R” meaning return or outlet indicating flow direction
to and from the coil. Blue letters mark the chilled water connec-
tions and red letters mark the hot water connections.
a. Each riser has a 3-in. swaged portion at top and suf-
ficient extension at bottom for an inserted length of
approximately 2 inches. This unit-to-unit joint is
NOT intended for full bottoming in the joint, but
allows for variations in floor-to-floor dimensions
and for correct riser positioning.
If job requires that unit risers be supplemented with
between-the-floor extensions, pieces may be field-
supplied or factory-supplied. If factory-supplied,
insulation is also provided.
b. Level unit to ensure proper coil operation and con-
densate drainage. Proper riser installation and verti-
cal positioning in the unit provides for a unit piping
run-out to the service valves, which are centered in
the access slots and level or sloping down slightly
away from the riser. This prevents condensation
from running back to the riser and possible damage
from dripping at the bottom of a riser column. Each
job has specific requirements, and satisfying those
requirements is the responsibility of the installer.
After units are positioned and riser centered in pipe
chase, make unit plumb in two directions, using unit
frame as a reference.
c. Anchor unit to building. Use bolts or lag screws
through holes provided in unit frame.
d. After all units in a stack are anchored, make unit-to-
unit riser joints. First, center each coil-to-riser line
within the expansion slot in the unit back panel.
Each riser joint must be in vertical alignment with at
least 1-in. penetration into the swaged joint. This
condition is met if floor-to-floor dimension is as
specified and coil-to-riser lines are properly cen-
tered. Wide variations in floor-to-floor dimensions
may necessitate cutting off or extending individual
risers. Such modifications are the full responsibility
of the installing contractor.
e. Before making the riser joints, the riser insulation
must be pulled back away from the joint and pro-
tected from heat during the brazing process. The
riser joint filler material must be selected to with-
stand the total operating pressure (both static and
pumping head) to which the system will be sub-
jected. Low temperature lead alloy solders such as
“50/50” and “60/40” are normally not suitable.
8. Anchor risers as required:
a. Do not fasten risers rigidly within each unit. Risers
must be free to move within pipe chase in response
to normal vertical expansion and contraction. The
unit internal piping is designed to accommodate a
total riser vertical movement of ± 3/4-in., due to ther-
mal expansion and/or contraction, when positioned
properly at the jobsite.
b. Built-in risers must be anchored at some point to
building structure. Unit design accommodates up to
11/2-in. expansion and contraction in riser assem-
blies when positioned properly at the job-site. Risers
must be anchored to the building structure to limit
expansion and contraction movement to a maximum
of 11/2-in. Riser anchoring and expansion compensa-
tion is not included in the factory-supplied unit and
must be field-provided. While some special riser
features are available from the factory, riser end
caps, air vents, and/or flushing loops are normally
provided on the job by the installer.
9. Test the system for leaks after the connections are com-
pleted. When testing with air or some other gas, it might
be necessary to tighten stem packing nuts on some valves
to maintain air pressure in the riser. Pressure testing ris-
ers with water should be done with the unit service
valves closed to prevent flushing debris into the unit
valve packages. This will also allow risers to be drained
down after testing in the winter to avoid freeze-up prob-
lems. In the event that leaking or defective components
are discovered, the sales representative must be notified
before any repairs are attempted. All leaks should be
repaired before proceeding with the installation.
10. After system integrity has been established, pull the riser
insulation back into place over the joint and glue or seal
to prevent sweating and heat loss or gain. Internal chilled
CAUTION
Toxic residues and loose particles resulting from manu-
facturing and field piping techniques such as joint com-
pounds, soldering flux, and metal shavings may be pres-
ent in the unit and the piping system. Special consider-
ation must be given to system cleanliness when
connecting to solar, domestic or potable water systems.
Failure to heed this warning could result in equipment
damage.
WALL STUDS
INSTALL WALL
GYPSUM
BOARD
(TO WALL AND
OVER TOP OF
UNIT)
INSTALL
GYPSUM
BOARD TO
UNIT SIDES
INSTALL
GYPSUM
BOARD TO
FACE OF
UNIT WITH
CUT OUTS
FOR SUPPLY,
RETURN AND
THERMOSTAT
IMPORTANT: Chilled water and hot water risers should
never be piped to drain down into the condensate riser. Exten-
sive water damage can occur due to drain overflow. Drain
chilled and hot water risers to a remote location away from
the unit such as sink, room or floor drains.

16
water piping and valves are located over the drain pan
and need not be insulated.
11. If required, fireproof where necessary. Any fireproofing
requirements where risers or piping penetrate floors or
walls are the responsibility of the installer. This work
should be done only after all pressure testing is com-
pleted. The fireproofing method used must accommodate
pipe expansion and contraction and the piping must be
protected from abrasion and chemical attack. The pipe
insulation also must be maintained to prevent sweating
and must be protected from wear or erosion at the joint
between the insulation and the fireproofing material.
42SU UNIVERSAL ARRANGEMENT
The unique design of the universal stack fan coil unit allows
for field configuration for each unit. Air discharge, riser,
drain, and outside air knockouts have been strategically locat-
ed on each unit. Risers, shown with unit, are for reference on-
ly. All risers are factory fabricated and shipped loose for field
installation.
It is important that you identify all of the unit feature loca-
tions and which knockouts you intend to use before proceed-
ing with the installation. See Fig. 15-19. Also, it must be de-
termined whether your application requires a Mating Unit
(primary/secondary) and its configuration. Consult your local
sales representative or the factory for further details on pri-
mary/secondary arrangements.
Potential Universal Arrangement Unit Configurations
Risers: Three Locations
The pre-installed supply, return, and drain risers (2-pipe or 4-
pipe applications) can be oriented on any of three sides of the
unit (see Fig. 15).
Risers cannot be installed on the return air side of the cabinet.
Fig. 15 — 42SU Unit Configuration
Unit orientation is determined based on the location of the
risers in the building. The riser side of the universal stack unit
always determines the rear of the unit. See Fig. 16.
Fig. 16 — 42SU Unit Orientation
Return Air: Single Location
The return air/access panel may then be oriented on the left,
right, or front of the unit.
Supply Air: Five Locations (4 sides and top)
Includes stitched design for 1/2-in. duct flanges.
Outside Air: Two Locations
Either side adjacent to the return air opening.
NOTE: Outside air opening may be used on a side if risers are
configured on that same side.
Supply, Return, and Drain Riser Installation
1. Three sides of each universal stack unit have four supply
and return riser knockouts along the center and one drain
knockout near the lower part of the unit (see Fig. 17).
Identify whether your application uses a 2-pipe or 4-pipe
configuration.
a. Two-pipe configurations typically use the two inner
riser knockouts.
b. Four-pipe configurations will use all four riser
knockouts.
2. Locate and mark the riser and drain knockouts that apply
to your particular unit application, ensuring proper orien-
tation of the return air opening in room.
3. Insert a flat head screw driver into knockout slot shown
in Fig. 18.
4. Pry screw driver back and forth until knockout tabs break
away from the unit.
5. Discard knockout. Be careful of sharp edges.
6. Use a sharp retractable knife (see Fig. 19) and vertically
cut the insulation down the center of the riser and drain
knockouts the full length of the knockout.
7. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
42SU
CABINET
RETURN AIR
HR CRDHS CS
HR CRDHS CS
HR CRDHS CS
DCR
HS CS
HR
RDS
HR = HOT WATER RETURN
HS = HOT WATER SUPPLY
D = DRAIN
CR = COLD WATER RETURN
CS = COLD WATER SUPPLY
R = RETURN
D = DRAIN
S = SUPPLY
2- or 4-PIPE
REAR
RISER SIDE
42SU
CABINET
RIGHT
FRONT
LEFT

17
Fig. 17 — Locate 42SU Unit Knockouts
Fig. 18 — Remove 42SU Unit Knockouts
Fig. 19 — 42SU Unit Knockout Insulation Removal
Submittals and product literature detailing unit operation,
controls, and connections should be thoroughly reviewed BE-
FORE beginning the connection and testing of risers and
piping.
To assure optimal unit performance, the supply connection(s)
are marked on the unit’s coil with an “S” meaning supply or
inlet and “R” meaning return or outlet indicating flow direc-
tion to and from the coil. Blue letters mark the chilled water
connections and red letters mark the hot water connections.
The unit’s internal piping is designed to accommodate a total
riser vertical movement of ±1½ in., due to thermal expansion
and/or contraction, when positioned properly at the jobsite.
Risers must be anchored to the building structure to limit ex-
pansion and contraction movement to a maximum of 3 inch-
es. Riser anchoring and expansion compensation is not in-
cluded in the unit and must be provided. Riser end caps, air
vents, and/or flushing loops must be provided at the jobsite
by the installer.
Proper field riser installation and vertical positioning in the
unit should have a pipe run-out to the service valves which
are centered in the knockout access slots and that slope down
slightly away from the riser (see Fig. 20). This prevents con-
densation from running back to the riser and possible damage
from dripping at the bottom of a riser column. Each job has
specific requirements and satisfying those requirements is the
responsibility of the installer.
Riser to Unit Installation
Before making the riser joints, the riser insulation must be
pulled back away from the joint and protected from heat
during the brazing process. Each riser joint must be in vertical
alignment. Variations in floor-to-floor dimensions may re-
quire field work such as cutting off or extending the risers.
This operation is the responsibility of the installer. The riser
joint filler material must be selected to withstand the total op-
erating pressure (both static and pumping head) to which the
system will be subjected. Low temperature lead alloy solders
such as “50/50” and “60/40” are normally not suitable.
Riser to Drain Installation
1. After the applicable supply, return, and drain knockouts
have been removed, carefully position the unit so that the
riser ball valves penetrate into the unit through the riser
TOP SUPPLY
AIR KNOCKOUT
TOP VIEW
ELECTRICAL
KNOCKOUTS
SIDE SUPPLY AIR
KNOCKOUT
1 PER SIDE
RISER KNOCKOUTS
4 PER SIDE,
EXCEPT ON
RETURN AIR SIDE
DRAIN KNOCKOUT
1 PER SIDE,
EXCEPT ON
RETURN AIR SIDE
OUTSIDE AIR
KNOCKOUT
2 SIDES ONLY,
ADJACENT TO
RETURN AIR
OPENING
SIDE VIEW
RETURN
AIR
OPTIONAL
ELECTRICAL
KNOCKOUTS
KNOCKOUT
SLOT
KNOCKOUT
TAB
KNOCKOUT
KNOCKOUT
TAB
DRAIN
KNOCKOUT
SUPPLY AND RETURN
CAUTION
Toxic residues and loose particles resulting from manu-
facturing and field piping techniques such as joint com-
pounds, soldering flux, and metal shavings may be pres-
ent in the unit and the piping system. Special consider-
ation must be given to system cleanliness when
connecting to solar, domestic or potable water systems.
DRAIN
INSULATION
CUT LINE
SUPPLY AND RETURN
INSULATION CUT LINE

18
knockouts, making sure the insulation penetrates into the
unit as shown in Fig. 20-23.
2. Before anchoring the equipment in place, the unit must
be leveled and the cabinet must be plumb and squared.
The unit may be anchored in place by bolting directly
through the unit floor or attaching to the cabinet in some
location that will not interfere with drywall or other
items such as the supply grille, thermostat, or return
access panel. When attaching to the unit cabinet, care
must be taken to not penetrate the cabinet in locations
that may damage internal components or wiring. The
mounting technique is a matter of choice; however, the
unit should always be anchored securely to prevent
movement during construction and riser expansion and
contraction. After anchoring the unit, it is then ready for
the various service connections such as riser connections
and electrical.
3. The plastic flare caps on the end of the riser ball valves
should be removed and discarded.
4. All universal stack units use reinforced braided stainless
steel flexible hose kits for piping between field-installed
risers and unit water coils as shown in Fig. 21. The hose
kit design has threaded connections on each end. The
hose kits allow for riser fluctuations due to thermal
expansion.
Fig. 20 — 42SU Unit Riser to Unit Installation Setup
Fig. 21 — 42SU Unit Riser to Unit Installation
Fig. 22 — 42SU Unit Riser to Unit Installation
(Tighten Swivel Connections)
Fig. 23 — 42SU Unit Riser to Drain Installation
5. Use a wrench to tighten the swivel connections. Use a
backup wrench to hold the riser ball valve stationary to
prevent it from bending or twisting during installation as
shown in Fig. 22. Be careful not to over-tighten swivel
connections.
6. Locate the unit’s coil fitting.
7. The plastic flare caps on the end of the coil fitting should
be removed and discarded.
8. Use a wrench to tighten the swivel connections. The baf-
fle acts as a secondary wrench. Be careful not to over-
tighten swivel connections.
9. Locate the p-trap drain and rubber hose factory installed
to the drain pan connection in the bottom of the unit as
shown in Fig. 23.
10. Push the rubber drain hose over the riser drain stubout.
Be careful not to bend the drain stubout.
11. Adjust the hose clamp over the riser stubout and rubber
hose to hold in place as shown in Fig. 23.
12. Test for leaks. Any and all leaks should be repaired
before proceeding with installation. When testing with
air or some other gas, it might be necessary to tighten
stem packing nuts on some valves to maintain air pres-
sure in the riser. Pressure testing risers with water should
be done with the unit service valves closed to prevent
flushing debris into the unit valve packages. This will
FLARE CAP
BALL
VALVE
RISER STUBOUT
INSULATION
THREADED
FLARE FITTING
UNIT INSULATION
OUTER
CABINET
RISER KNOCKOUT
SLOT
FLEXIBLE
HOSE KIT
RISER
BALL
VALVE
RISER STUBOUT
INSULATION
CONNECTION POINT TO ANY FACTORY
FURNISHED AND INSTALLED
COMPONENTS.
COIL
BAFFLE
CAUTION
Hose connection torque requirements are 350 in. lb +10/
–0 in. lb to prevent leaks.
CAUTION
Hose connection torque requirements are 350 in. lb +10/
–0 in. lb to prevent leaks.
BACKUP
WRENCH
BALL
VALVE WRENCH
SWIVEL
CONNECTION
DRAIN PAN
DRAIN
CLAMP
CLAMP
RISER KNOCKOUT
UNIT INSULATION
PTRAP
UNIT WALL
RISER
RISER STUBOUT

19
also allow risers to be drained down after testing in the
winter to avoid freeze-up problems. In the event that
leaking or defective components are discovered, the
sales representative must be notified BEFORE any
repairs are attempted. All leaks should be repaired before
proceeding with the unit installation.
13. After system integrity has been established, the riser
insulation must be pulled back into place over the joint
and glued or sealed to prevent sweating and heat loss or
gain. All of the risers, including the riser stubouts, should
be properly covered with insulation. Internally mounted
chilled water piping and valves are located over the drain
pan and need not be insulated.
Any fireproofing requirements where risers or piping pene-
trate floors or walls are the responsibility of the installer. This
work should be done only after all pressure testing is com-
pleted. The fireproofing method used must accommodate
pipe expansion and contraction and the piping must be pro-
tected from abrasion and chemical attack. The pipe insulation
also must be maintained to prevent sweating and must be pro-
tected from wear or erosion at the joint between the insulation
and the fireproofing material.
When no risers are ordered for the universal stack unit, it is
the responsibility of the installer to make sure that an isola-
tion ball valve is installed between each supply and return
piping connection to the unit. Flare fittings are factory pro-
vided to allow connection between the ball valves and the
hoses.
Supply Air Installation
Each side of the unit has one supply air knockout as well as a
supply air knockout on the top of the unit (see Fig. 17).
1. Determine which supply air opening/openings are
required for your application.
NOTE: The supply air opening on the riser side of the unit
should not be used.
2. Use a sharp retractable knife to trim insulation using cen-
ter knockout slot/trim line as pattern (see Fig. 24).
3. Use a sharp standard needle nose pliers and grab knock-
out tab (see Fig. 24).
Fig. 24 — 42SU Unit Supply Air Knockout Tab
Location
4. Twist or pry pliers back and forth until knockout tab
breaks away from unit.
5. Repeat for all supply air tabs until all have been broken.
6. Discard center knockout piece. Be careful of sharp
edges.
7. Use a sharp retractable knife to trim any excess insula-
tion using knockout hole as pattern.
8. Use duct pliers (hand seamers) to fold duct flange out of
the unit 90 degrees for each side of the supply air open-
ing along duct break (see Fig. 24). The 90-degree flanges
can now be used as drywall stops to prevent coverage of
discharge opening (see Fig. 25).
Fig. 25 — 42SU Supply Air Installation
9. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
10. For ducted applications tape should be applied along and
around all of the supply air opening knockouts to prevent
air leakage.
All installations should be made in compliance with all gov-
erning codes and ordinances. Compliance with all codes is
the responsibility of the installing contractor.
42SM UNITS
The unique design of the mega stack fan coil unit allows for
field-configuration of each unit. Risers, shown with unit, are
for reference only. All risers are factory-fabricated and
shipped loose for field installation.
It is important that you identify all of the unit feature loca-
tions before proceeding with the installation (see Fig. 9). Al-
so, it must be determined whether your application requires a
mating unit (primary/secondary) and its configurations. Con-
sult your local sales representative or the factory for further
details on primary/secondary arrangements.
Unit orientation is determined based on the location of the
risers in the building. Risers can only be installed on the rear
side of the unit and always determine the rear of the mega
stack unit. The return air is always on the front (see Fig. 26).
Fig. 26 — 42SM Unit Installation
KNOCKOUT TAB
10 PLACES
DUCT BREAK
4 PLACES
KNOCKOUT TAB
TRIM LINE
UNIT
WALL
UNIT
INSULATION
90°
DUCT FLANGE
RETURN AIR
42SM
CABINET
HR CRDHS CS
HR = HOT WATER RETURN
HS = HOT WATER SUPPLY
D = DRAIN
CR = COLD WATER RETURN
CS = COLD WATER SUPPLY
DCR
HS CS
HR
R = RETURN
D = DRAIN
S = SUPPLY
RDS
2 or 4PIPE
RIGHTLEFT
REAR
FRONT

20
Supply, Return, and Drain Risers
Submittals and product literature detailing unit operation,
controls, and connections should be thoroughly reviewed BE-
FORE beginning the connection and testing of risers and
piping.
The supply and return connections are marked on the coil
stubouts and the valve package depending on your configura-
tion. “CS” means cold water supply, “CR” means cold water
return, “HS” means hot water supply, and “HR” means hot
water return to indicate flow direction to and from the coil.
Blue letters mark the chilled water connections and red letters
mark the hot water connections.
The unit internal piping is designed to accommodate a total
riser vertical movement of ±11/2 in., due to thermal expansion
and/or contraction, when positioned properly at the jobsite.
Risers must be anchored to the building structure to limit riser
expansion and contraction movement to a maximum of 3
inches. Riser anchoring and expansion compensation is not
included in the factory-supplied unit and must be field-pro-
vided. While some special riser features are available from
the factory, riser end caps, air vents, and/or flushing loops are
normally provided on the job by the installer.
Riser to Unit Installation
Proper riser installation and vertical positioning in the unit
provides for a unit piping run-out to the service valves which
are centered in the access slots and level or sloping down
slightly away from the riser. This prevents condensation from
running back to the riser and possible damage from dripping
at the bottom of a riser column. Each job has specific require-
ments and satisfying those requirements is the responsibility
of the installer.
Riser to Drain Installation
1. Carefully position the unit so that the riser ball valves
penetrate into the unit through the riser slot making sure
the insulation penetrates into the unit as shown in Fig. 27
and 28.
Fig. 27 — 42SM Riser to Unit Installation
Fig. 28 — 42SM Riser to Unit Connection
2. Before anchoring the equipment in place, the unit must be
leveled and the cabinet must be plumb and squared. The
unit may be anchored in place by bolting directly through
the unit’s floor or attaching to the building walls through
the cabinet walls in some location that will not interfere
with drywall or other items such as the supply grille, ther-
mostat, or return access panel. When attaching sheet rock
to the unit cabinet, care must be taken to not penetrate the
cabinet in locations that may damage internal components
or wiring. The mounting technique is a matter of choice;
however, the unit should always be anchored securely to
the building to prevent movement during construction and
riser expansion and contraction. After anchoring the unit,
it is then ready for the various service connections such as
riser connections and electrical.
3. The plastic flare caps on the end of the riser ball valves
should be removed and discarded.
4. All mega stack units use reinforced braided stainless
steel flexible hose kits for piping between field-installed
risers and unit water coils as shown in Fig. 28. Each hose
has threaded connections on each end. The hose kits
allow for riser fluctuations due to thermal expansion.
5. Use a wrench to tighten the swivel connections. Use a
backup wrench to hold the riser ball valve stationary to
prevent it from bending or twisting during installation as
shown in Fig. 29. Be careful not to over-tighten swivel
connections.
Fig. 29 — 42SM Riser to Unit Installation
(Tighten Swivel Connections)
CAUTION
Toxic residues and loose particles resulting from manu-
facturing and field piping techniques such as joint com-
pounds, soldering flux, and metal shavings may be pres-
ent in the unit and the piping system. Special consider-
ation must be given to system cleanliness when
connecting to solar, domestic or potable water systems.
BALL
VALVE
RISER STUBOUT
INSULATION
THREADED
FLARE FITTING
FLARE CAP
UNIT INSULATION
OUTER
CABINET
RISER KNOCKOUT
SLOT
CAUTION
Hose connection torque requirements are 350 in. lb +10/
–0 in. lb to prevent leaks.
FLEXIBLE
HOSE KIT
RISER
BALL
VALVE
RISER STUBOUT
INSULATION
CONNECTION POINT TO ANY FACTORY
FURNISHED AND INSTALLED
COMPONENTS.
COIL
BAFFLE
BACKUP
WRENCH
BALL
VALVE WRENCH
SWIVEL
CONNECTION