Trane LO User Manual
Installation
Operation
Maintenance
UniTrane® Fan-Coil Room Conditioners
Force Flo™ Cabinet Heaters
Sizes 02-12
Low Vertical Fan-Coils
Sizes 03-06
Models
“LO” Design Sequence and Later
April 2000
UNT-IOM-6
Supercedes UNT-IOM-5
Table of Contents
General Information3
Cabinet Styles4
Model Number Description6
Receiving and Handling9
Jobsite Storage10
Installation Considerations11
Service Access12
Installation Checklist13
Vertical Units15
Installing the Unit15
Horizontal Units16
External Insulating Require-
ments20
Startup Checklist20
Units with Hydronic Coil Connec-
tions Only21
Piping21
Units with Steam Coils22
Factory Piping Package Connec-
tions24
Installing the Auxiliary Drain
Pan25
Condensate Overflow Detection
Device26
Automatic Changeover Sensor26
Automatic Electric Heat Lockout
Switch (Fan-coil) 27
Ductwork Recommendations32
Duct Connections32
Supply Power Wiring33
Electrical Connections33
Wall Mounted Control Interconnec-
tion Wiring35
Electrical Grounding Restric-
tions35
Fan Mode Switch 36
Installation36
Installing Wall Mounted Con-
trols36
Zone Sensor Installation37
Fan Mode Switch39
Tracer® ZN.010 and ZN.51040
Thermostat Module Operating
Information41
Binary Inputs42
Binary Outputs43
Analog Inputs44
Fan Mode Switch44
Zone Sensors44
Supply Fan Operation45
LED Activity46
Troubleshooting46
Yellow COMM LED47
Manual Output Test48
Diagnostics50
Resetting Diagnostics51
Troubleshooting 53
Tracer® ZN.52059
Troubleshooting83
Troubleshooting85
Tracer® Communication Wiring
88
Service Communication Wiring
89
Wall-Mounted Zone Sensor
Module89
TUC Human Interface90
Cooling and Heating Operation92
TUC Sequence of Operation92
Fan Mode Operation93
Entering Water Temperature
Sampling Function94
2-Pipe with Auxiliary Electric Heat
(Fan-coils)94
Fresh Air Damper Options95
BIP4: Low Temperature Detection
Option97
BIP3: Condensate Overflow
Detection Device97
BIP4: Smoke Input98
BIP1: External Interlock98
BIP3: Occupied/Unoccupied
Mode98
BIP2: Motion Detection99
Autocycle Test99
Reading Diagnostics 101
Reading the Operating Machine
State 102
Reading the Operating Control
Mode104
Resetting Diagnostics107
Diagnostics107
Unit Mode Listed as Standby108
Troubleshooting 109
Maintenance Procedures116
Periodic Maintenance Check-
list116
Maintenance116
Inspecting and Cleaning Drain
Pans118
Winterizing the Coil 120
Inspecting and Cleaning Coils121
Inspecting and Cleaning the
Internal Insulation on Fan-
Coils123
Inspecting and Cleaning the
Fan124
Fan Board Assembly Removal126
Factory Piping Packages128
Appendix128
Typical Wiring Diagrams129-134
2 UNT-IOM-6
General Information
UniTrane® fan-coil and Force Flo cabinet heaters units are single
room units with load capabilities of 200 to 1200 cfm. See Figure 1
for unit components. Fan-coil units are available as 2-pipe with or
without electric heat (one hydronic circuit) or 4-pipe (two hydronic
circuits). Force Flo units feature 2-pipe hydronic coils, electric heat
only, or steam only. Also, units feature a variety of factory piping
packages. See the Appendix on page 100 for more information on
available factory-installed piping packages.
®
Three control options are available with the UniTrane
Force Flo cabinet heater units.
1. fan mode switch
®
2. Tracer
ZN.010 and ZN.510, ZN.520
3. terminal unit controller (TUC)
All control options are available as unit or wall mounted. Units with a
®
Tracer
ZN.010, ZN.510, ZN.520 or TUC also feature a split combina-
tion: unit mounted fan mode switch with a wall mounted setpoint dial.
The Tracer® controllers (ZN.010, ZN.510 and ZN.520) utilize binary
outputs to operate 2-position control valves, supply fan/s, 2-position
dampers, and electric heat.
fan-coil and
The TUC utilizes binary outputs to control the fan and optional
auxiliary heat. In addition, it operates 2-position or 3 wire floating
point control valves and the fresh air damper.
Available supply and return openings vary with each cabinet style. In
addition, a fresh air opening with either a manual or motorized air
damper is an available option. See pages 4-5 for available cabinet
styles.
Control panel
*Main drain pan
Supply fan(s)
Fan motor(s)
*Featured on fan-coils only
Figure 1. Main components of a fan-coil or cabinet heater unit.
Hydronic coil
Throwaway filter
Piping package
*Auxiliary
drain pan
UNT-IOM-6 3
Model A
Vertical Concealed
Cabinet Styles
Model B
Vertical Cabinet
Model C
Horizontal Concealed
Model E
Horizontal Recessed
4 UNT-IOM-6
Model D
Horizontal Cabinet
Model F
Wall Hung Cabinet**
Model H
Vertical Recessed
Model J
Vertical Slope Top Cabinet
Model K
Low Vertical Concealed*
Model M
Inverted Vertical Cabinet**
*Fan-coil only
**Force Flo cabinet heater only
Model L
Low Vertical Cabinet*
Model N
Inverted Vertical Recessed**
UNT-IOM-6 5
Model Number
Description
Each UniTrane® fan-coil and Force Flo cabinet heater has a
multiple character model number unique to that particular unit. To
determine a units specific
options, reference the model
number on the unit nameplate
on the fan scroll. The unit
nameplate also identifies the
serial number, sales order
number, and installation and
operating specifications. See
Figure 2 for the nameplate
location.
Reference pages 7-8 for a
detailed explanation of the
model number.
Complete the installation checklist on page 13 to ensure proper and
safe operation.
Figure 2. The unit nameplate is
on the fan scroll.
6 UNT-IOM-6
Model Number Description
Digits 1 & 2 Unit Type
FC
FF
Digit 3 Model
A Vertical concealed
B Vertical cabinet
C Horizontal concealed
D Horizontal cabinet
E Horizontal recessed
F Vertical wall hung*
H Vertical recessed
J Vertical slope top
K Low vertical concealed
L Low vertical cabinet
M Inverted vertical cabinet*
N Inverted vertical recessed*
Digit 4 Development Sequence
B
Digits 57 Unit Size
020 200 cfm
030 300 cfm
040 400 cfm
060 600 cfm
080 800 cfm
100 1000 cfm
120 1200 cfm
Digit 8 Unit Voltage
1 115/60/1
2 208/60/1
3 277/60/1
4 230/60/1
5 208/60/3
6 230/6j0/3
7 480/60/3
8 110-120/50/1
9 220-240/50/1
A 220-240/50/3
B 380-415/50/3
Digit 9 Piping System Placement
A W/o piping, RH conn.,
w/o aux. drain pan
B W/o piping, LH conn.,
w/o aux. drain pan
C W/o piping, RH conn.,
w/ aux. drain pan
D W/o piping, LH conn.,
w/ aux. drain pan
E W/o piping, RH conn.,
w/o aux. drain pan,
ext. end pocket
F W/o piping, LH conn.,
w/o aux. drain
G W/o piping, RH conn.,
w/ aux. drain pan,
ext. end pocket
H W/o piping, LH conn.,
w/ aux. drain pan, ext. end
pocket
J With piping, RH
K With piping, LH
L With piping, RH, ext. end pocket
M With piping, RH, ext. end pocket
Digits 10 & 11 Design Sequence
LO
Digit 12 Inlet
A Front toe space
B Front bar grille
C Front stamped louver
D Bottom stamped louver
E Bottom toe space
F Back duct collar
G Open return
H Back stamped louver
Digit 13 Fresh Air Damper
0 None
A Manual, bottom opening
B Manual, back opening
C Manual, top opening
D Auto, 2 pos., bottom opening
E Auto, 2 pos., back opening
F Auto, 2 pos. top opening
G Auto, economizer,
bottom opening
H Auto, economizer, back opening
J Auto, economizer, top opening
K No damper, bottom opening
L No damper, back opening
M No damper, top opening
Digit 14 Outlet
A Front duct collar
B Front bar grille
C Front stamped louver
D Front quad grille
E Bottom duct collar
F Bottom stamped louver
G Top quad grille
H Top bar grille
J Top duct collar
K Bottom bar grille
Digit 15 Color
0 None
1 Deluxe beige
2 Soft dove
3 Cameo white
4 Driftwood grey
5 Stone grey
6 Rose mauve
Digit 16 Tamperproof Locks
& Leveling Feet
0 None
A Keylock panel
B Keylock access door
C Keylock panel & access door
D Leveling feet
E Keylock panel with leveling feet
F Keylock access door
w/leveling feet
G Keylock panel & access door
w/leveling feet
Digit 17 Motor
A Free discharge
B High static
Digit 18 Coil
A 2 row cooling/heating
B 3 row cooling/heating
C 4 row cooling/heating
D 2 row cooling, 1 row heating
E 2 row cooling, 2 row heating
F 3 row cooling, 1 row heating
G 2 row cooling or heating only
H 3 row cooling or heating only
J 4 row cooling or heating only
K 2 row cooling/heating, elec. heat
L 3 row cooling/heating, elec. heat
M 4 row cooling/heating, elec. heat
N Electric heat only, 1 stage
P 2 row cooling/heating,
1 row heating
Q 2 row cooling/heating,
2 row heating
R 3 row cooling/heating,
1 row heating
U Electric heat only, 2 stage
V Electric heat only, low kw, 1 stage
W Steam coil
Digit 19 Coil Fin Series
2 144
Digit 20 Air Vent
A Automatic
M Manual
Digits 21, 22, & 23 Electric Heat kW
[208 V kW derate in brackets]
000 None
010 1.0 [0.75]
015 1.5 [1.1]
020 2.0 [1.5]
025 2.5 [1.9]
030 3.0 [2.2]
040 4.0 [3.0]
045 4.5 [3.3]
050 5.0 [3.7]
060 6.0 [4.4]
070 7.0 [5.3]
075 7.5 [5.7]
080 8.0 [6.0]
100 10.0
105 10.5 [7.9]
110 11.0 [9.0]
120 12.0
135 13.5 [10.2]
150 15.0
180 18.0 [13.5]
200 20.0 [15.0]
*Force Flo cabinet heater only
UNT-IOM-6 7
Digit 24 Reheat
0 None
A Steam
B Hot water
Digit 25 Disconnect Switch
0 None
D With disconnect
Digit 26 Filter
0 None
11 TA
2 1 TA pltd. media
3 1 TA + 1 extra
4 1 TA pltd. media + 1 extra
5 1 TA + 2 extra
6 1 TA pltd. media + 2 extra
7 1 TA + 3 extra
8 1 TA pltd. media + 3 extra
Digit 27 Main Control Valve
0 None
A 2 way, 2 pos., N.O. (25 psig)
B 3 way, 2 pos., N.O. (30 psig)
C 2 way, 2 pos., N.C. (25 psig)
D 3 way, 2 pos., N.C. (15 psig)
E 2 way, 2 pos., N.O. (50 psig)
F 3 way, 2 pos., N.O. (50 psig)
G 2 way, 2 pos., N.C. (50 psig)
H 3 way, 2 pos., N.C. (50 psig)
J 2 way, mod., Cv = 0.7 (50 psig)
K 3 way, mod., Cv = 0.7 (50 psig)
L 2 way, mod., Cv = 1.5 (50 psig)
M 3 way, mod., Cv = 1.5 (50 psig)
N 2 way, mod., Cv = 2.5 (50 psig)
P 3 way, mod., Cv = 2.5 (50 psig)
Q 2 way, mod., Cv = 4.0 (50 psig)
R 3 way, mod., Cv = 4.0 (50 psig)
Digit 28 Auxiliary Control Valve
0 None
A 2 way, 2 pos., N.O. (25 psig)
B 3 way, 2 pos., N.O. (30 psig)
C 2 way, 2 pos., N.C. (25 psig)
D 3 way, 2 pos., N.C. (15 psig)
E 2 way, 2 pos., N.O. (50 psig)
F 3 way, 2 pos., N.O. (50 psig)
G 2 way, 2 pos., N.C. (50 psig)
H 3 way, 2 pos., N.C. (50 psig)
J 2 way, mod., Cv = 0.7 (50 psig)
K 3 way, mod., Cv = 0.7 (50 psig)
L 2 way, mod., Cv = 1.5 (50 psig)
M 3 way, mod., Cv = 1.5 (50 psig)
N 2 way, mod., Cv = 2.5 (50 psig)
P 3 way, mod., Cv = 2.5 (50 psig)
Q 2 way, mod., Cv = 4.0 (50 psig)
R 3 way, mod., Cv = 4.0 (50 psig)
Digit 29 Piping Package
0 None
A Ball valve supply & return
B Ball valve supply & manual circuit
setter return
C Ball valve supply & auto circuit
setter
D Ball valve supply & return
w/strainers & unions
E Ball valve supply & manual circuit
setter w/strainers & unions
F Ball valve supply & auto circuit
setter w/strainers & unions
Digit 30 Control Type
A Fan Speed Switch
C TUC
D TUC w/Trane ICS
E Tracer
F Tracer
®
ZN.010
®
ZN.510
G Tracer® ZN.520
Digit 31 Control Options
D Unit mtd. fan mode switch (OHML)
K Wall mtd. fan mode switch (OHML)
V Unit mtd. zone sensor, w/SP
rotary, & fan mode switch
(OAHML),
W Wall mtd. zone sensor w/
SP rotary, & fan mode switch
(OAHML),
X Unit mtd. fan mode switch, wall
mtd. setpoint dial zone sensor
Digit 32-34 Future Control Options
Digit 35 Control Function 3
0 None
2 Condensate overflow detection
Digit 36 Control Function 4
0 None
2 Low temperature detection
Digits 37 & 38 Future Control Options
Digit 39 Recessed Options
0 None
A Stand. 5/8 recessed panel
B 2 projection panel
C 2.5 projection panel
D 3 projection panel
E 3.5 projection panel
F 4 projection panel
G 4.5 projection panel
H 5 projection panel
J 5.5 projection panel
K 6 projection panel
L 2 falseback
M 3 falseback
N 4 falseback
P 5 falseback
Q 6 falseback
R 7 falseback
T 8 falseback
Digit 40 Main Auto Circuit Setter GPM
0 None
A 0.5
B 0.75
C 1.0
D 1.5
E 2.0
F 2.5
G 3.0
H 3.5
K 4.5
L 5.0
M 6.0
N 7.0
P 8.0
Q 9.0
R 10.0
T11.0
U 12.0
J 4.0
Digit 41 Auxiliary Auto Circuit Setter GPM
0 None
A 0.5
B 0.75
C 1.0
D 1.5
E 2.0
F 2.5
G 3.0
H 3.5
K 4.5
L 5.0
M 6.0
N 7.0
P 8.0
Q 9.0
R 10.0
T11.0
U 12.0
J 4.0
Digit 42 Subbase
0 None
A 2 height
B 3 height
C 4 height
D 5 height
E 6 height
F 7 height
Digit 43 Recessed Flange
0 None
A Recessed flange
Digit 44 Wallbox
0 None
A Anodized
8 UNT-IOM-6
Receiving and Handling
UniTrane® fan-coil and Force Flo cabinet heaters ship in individual
cartons for maximum protection during shipment and for handling and
storage ease. Each carton has tagging information such as the
model number, sales order number, serial number, unit size, piping
connections, and unit style to help properly locate the unit in the floor
plan. If specified, the unit will ship with tagging designated by the
customer.
Complete the following checklist before accepting delivery of units to
detect any shipping damage.
o 1. Inspect each piece of the shipment before accepting it.
Check for rattles, bent carton corners, or other visible indications of
shipping damage.
o 2. If the carton appears damaged, open it immediately and
inspect the contents before accepting. Do not refuse the shipment.
Make specific notations concerning the damage on the freight bill.
Check the unit casing, fan rotation, coils, condensate pan, filters, and
all options or accessories.
o 3. Inspect the unit for concealed damage and missing compo-
nents soon after delivery and before storing. Report concealed
damage to the delivering carrier within the allotted time after
delivery (check with the carrier on the allotted time to submit a
claim).
o 4. Do not move damaged material from the receiving location if
possible. It is the receivers responsibility to provide reasonable
evidence that concealed damage did not occur after delivery.
o 5. Do not continue to unpack shipment if it appears damaged.
Retain all internal packing, cartons, and crate. Take photos of the
damaged material if possible.
o 6. Notify the carriers terminal of damage immediately by phone
and mail. Request an immediate joint inspection of the damage by
the carrier and consignee.
o 7. Notify the Trane sales representative of the damage and
arrange for repair. Have the carrier inspect the damage before beginning any repairs to the unit.
UNT-IOM-6 9
Jobsite Storage
This unit is intended for indoor use only. To protect the unit from
damage due to the elements and prevent it from possibly becoming a
contaminant source for IAQ problems, store the unit indoors. If indoor
storage is not possible, the Trane Company makes the following
provisions for outdoor storage:
1. Place the unit(s) on a dry surface or raised off the ground to assure
adequate air circulation beneath unit and to assure that no portion of
the unit contacts standing water at any time.
2. Cover the entire unit with a canvas tarp only. Do not use clear,
black or plastic tarps as they may cause excessive moisture condensation and equipment damage.
Note: Wet interior unit insulation can become an amplification site for
microbial growth (mold), which may cause odors and health-related
indoor air quality problems. If there is visable evidence of microbial
growth (mold) on the interior insulation, remove and replace the
insulation prior to operating the system. Refer to the Inspecting and
Cleaning the Internal Insulation section on page 123 for more
information.
10 UNT-IOM-6
Installation
Considerations
Complete the following checklist before installing the unit.
o 1. Clearances
Allow adequate space for free air circulation, service clearances,
piping and electrical connections, and any necessary ductwork. For
specific unit dimensions, refer to the submittals. Allow clearances
according to local and national electric codes. See the following
section on Service Access and refer to Figure 3 on page 12 for
recommended service and operating clearances. Provide removable
panels for concealed units.
o 2. Structural Support
The floor should be strong enough to adequately support floor
mounted units. The installer is responsible to supply adequate
support rods for installation of ceiling units.
o 3. Level
If necessary, prepare the floor or ceiling to ensure the unit installation
is level (zero tolerance) in both horizontal axis to allow proper
operation.
Set the unit level using the chassis end panels as a reference point.
Do not use the coil or drain pan as the reference point since the coil
is pitched and the drain pan has an inherent positive slope to provide
proper drainage.
o 4. Condensate Line
A continuous pitch of 1 inch per 10 feet of condensate line run is
necessary for adequate condensate drainage.
o 5. Wall and Ceiling Openings
Recessed units only:
Refer to the submittal for specific dimensions of wall or ceiling
openings before attempting to install the unit.
Horizontal concealed units only:
The installation of horizontal concealed units must meet the requirements of the National Fire Protection Association (N.F.P.A.) Standard 90A or 90B concerning the use of concealed ceiling spaces as
return air plenums.
o 6. Exterior
Touch up painted panels if necessary. If panels need paint, sanding
is not necessary. However, clean the surface of any oil, grease, or
dirt residue so the paint will adhere. Purchase factory approved touch
up epoxy paint from your local Trane Service Parts Center and apply.
UNT-IOM-6 11
Service
Access
24 in.
Vertical or Low
Vertical Cabinet
A
Service access is available from the front on vertical units and from
the bottom on horizontal units. Cabinet and recessed units have
removable front or bottom panels to allow access into the unit. See
Figure 3 for recommended service and operating clearances.
Units have either right or left hand piping. Reference piping locations
by facing the front of the unit (airflow discharges from the front). The
control panel is always on the end opposite the piping.
The unit has a modular fan board assembly that is easy to remove.
Also, the main drain pan is easily removable for cleaning. See the
Maintenance section beginning on page 88 for more details on
servicing.
8.5 in.
12 in.
both sides
both sides
Vertical or Low Vertical
Concealed or Vertical
Recessed
3 in.
A
36 in.
12 in.
both sides
24 in.
C
28 in.
6 in.
B
Horizontal
Cabinet
A- Front Access or Front Free Discharge B- Control Access Door C- Front Free Discharge D- Back Louvered Return
Figure 3. Recommended Service and Operating Clearances
12 UNT-IOM-6
8.5 in.
both sides
Horizontal Concealed
or Recessed
28 in.
Installation Checklist
The following checklist is only an abbreviated guide to the detailed
installation procedures given in this manual. Use this list to ensure all
necessary procedures are complete. For more detailed information,
refer to the appropriate sections in this manual.
WARNING: Allow rotating fan to stop before
!
servicing equipment. Failure to do so may cause severe
personal injury or death.
o 1. Inspect the unit for shipping damage.
o 2. Level installation location to support the unit weight ad-
equately. Make all necessary wall or ceiling openings to allow
adequate air flow and service clearances.
o 3. Ensure the unit chassis is level.
CAUTION: The unit must be installed level (zero
!
tolerance) in both horizontal axis for proper operation.
Failure to do so may result in condensate management
problems such as standing water inside the unit. Standing water and wet surfaces may result in microbial
growth (mold) in the drain pan that may cause unpleasnt
odors and serious health-related indoor air quality problems.
o 4. Secure the unit and any accessory items properly to the
wall or ceiling support rods.
o 5. Complete piping connections correctly.
o 6. Check field sweat connections for leaks and tighten the
valve stem packing, if necessary.
o 7. Install the auxiliary drain pan properly under piping package
on fan-coil units.
o 8. Pitch condensate drain line 1 inch drop per 10 feet of line
run on fan-coil units.
UNT-IOM-6 13
o 9. Complete condensate drain line connections on fan-coil
units.
o 10. Install automatic changeover sensor option on the
supply water line.
o 11. Install automatic electric heat lockout switch option on
the supply water line.
o 12. Install condensate overflow switch option correctly on
the auxiliary drain pan.
o 13. Install the low temperature detection device option correctly.
o 14. Complete all necessary duct connections.
o 15. Complete all interconnection wiring for the wall mounted fan
mode switch or zone sensor per the wiring schematic and guidelines
established in the Wall Mounted Control Interconnection Wiring
section on page 35.
o 16. Install the wall mounted fan mode switch, or zone sensor
module options properly.
o 17. Connect electrical supply power according to the NEC and
unit wiring diagrams.
o 19. Remove any miscellaneous debris, such as sheetrock, that
may have infiltrated the unit during construction.
o 20. Replace the air filter as required.
14 UNT-IOM-6
Installing the Unit
Before beginning installation, refer to Table 1 on page 17 for unit
weights and Figure 3 on page 12 for service and operating clearances.
In addition, refer to the unit submittal for installation details.
CAUTION: Do not allow electrical wire to fall
!
between the unit and installation surface. Failure to
comply may cause electrical shorts or difficulty in accessing wires.
Vertical Units
Cabinet & Concealed Units
Size L (in.)
02 21 1/4
03 21 1/4
04 26 1/4
06 35 3/4
08 44 1/4
10 63 1/4
12 63 1/4
Install vertical units in an upright position using the 5/8 inch diameter
double key slot hanger holes, located on the back of unit. The hanger
holes allow a maximum shank size of 5/16 inch diameter threaded
rods or lag screws (installer provides). Follow the installation procedure below.
1. Prepare wall openings for recessed units. Reference unit submittal
for each unit size dimensions.
2. If the unit has leveling legs, adjust them correctly to level unit.
3. Mark the position of the keyslot hanger holes on the wall according
to the dimensions given in Figure 4 for each unit size. Align the
hole locations evenly.
L
15.5 in.
Low Vertical Cabinet & Concealed
Size L (in.)
03 26 1/4
04 35 3/4
06 44 1/4
L
12.19 in.
7.5 in.
Floor Level
Figure 4. Keyslot Hanger Hole Locations
UNT-IOM-6 15
Floor Level
4. Insert the threaded rods or lag screws in the wall before setting the
unit in place.
5. Remove the front panel (cabinet unit only) by lifting it upward.
6. Position the hanger holes, located on the back of the unit, over the
rod or lag screw heads, pushing the unit downward to properly
position.
7. Complete piping and wiring connections, in addition to any necessary ductwork to the unit as instructed in the following sections.
Ensure that the auxiliary drain pan is in position on fan-coil units.
8. Install the front panel before starting the unit.
On cabinet units, replace the front panel by aligning the bottom tabs
on the unit with the respective slots on the panel bottom. Align the
top edge of the unit with the panel.
On recessed units, install the front panel by aligning and locking
together the interlocking support channel of the panel and unit. While
holding the panel against the unit, tighten the screws at the top of the
panel until it fits tight against the units front. Do not over tighten the
screws.
CAUTION: All unit panels and filters must be in
!
place prior to unit start-up. Failure to have panels and
filters in place may cause motor overload.
Horizontal Units
16 UNT-IOM-6
Install horizontal units suspended from the ceiling using the four 5/8
inch diameter double key slot hanger holes, located on the top of the
unit. The hanger holes allow a maximum shank size of 5/16 inch
diameter threaded rods or lag screws (installer provided). Follow the
installation procedure below.
Note: Follow the requirements of National Fire Protection Association
(NFPA) Standard 90A or 90B, concerning the use of concealed
ceiling spaces as return air plenums.
1. Prepare the ceiling opening for recessed units. Reference the unit
submittals for each unit size dimensions.
2. Position and install the suspension rods or a suspension device
(supplied by installer) according to the unit size dimensions in
Figure 4 on page 15. Also refer to the weight range chart given in
Table 1.
3. On cabinet units, remove the bottom panel by using a 5/32 inch
Allen wrench to unscrew fasteners. Swing the panel down and lift
outward.
4. Level the unit by referencing the chassis end panels. Adjust the
suspension device.
5. Complete piping and wiring connections, in addition to any neces
sary ductwork as instructed in the following sections. Ensure that
the auxiliary drain pan is in position on fan-coil units.
6. Install the bottom panel before starting the unit.
7. Ensure condensate drain line is pitched 1 inch per 10 feet of pipe
away from fan-coil unit.
Table 1. Unit Operating Weights, pounds (kg)
Unit Cabinet Concealed Recessed Low Vertical Low Vertical
Size Models Models Models Cabinet Models Concealed
Models
02 84 (38) 68 (31) 68 (31) NA NA
03 84 (38) 68 (31) 68 (31) 112 (51) 96 (44)
04 112 (51) 96 (44) 78 (35) 139 (63) 123 (56)
06 139 (63) 123 (56) 118 (54) 148 (67) 131 (59)
08 148 (67) 131 (59) 129 (59) NA NA
10 200 (91) 182 (83) 243 (110) NA NA
12 200 (91) 182 (83) 243 (110) NA NA
Note: All weights are approximate. Individual weights may vary depending upon the units options.
UNT-IOM-6 17
Cabinet units:
Install the bottom panel by placing the hinged end on the units hinged
end (always at the return end of the unit). See Figure 4 on page 15 for
keyslot hanger hole locations. Swing the panel upward into position.
Tighten the panel to the unit with the fasteners provided. Do not overtighten the fasteners.
Recessed units:
See Figure 5 on page 19 and follow the procedure below.
· Insert the mounting bolts through the panel brackets of the trim ring
and secure to the hanger holes on the unit. Tighten the mounting
bolts to pull the trim ring snug against the finished ceiling.
· Install the bottom panel by placing the hinged end on the trim ring
hinged end (always at the units return end).
· Adjust the inner duct of the expansion collar (on units with a bottom
return) to ensure a tight fit against the insulation located on the
perimeter of the bottom panels return louver.
· Safety chain assembly: close s-hook on each end of chain. Insert s hooks through holes in unit and door. Close s-hook on door.
· Insert retaining screws through bottom panel door and place
retaining rings on screws.
· Swing the bottom panel upward into position. Hook the safety chain
to the bottom panel and the unit. Tighten the panel to the unit with
the fasteners provided. Do not over tighten the removable front
access panel.
CAUTION: All unit panels and filters must be in
!
place prior to unit start-up. Failure to have panels and
filters in place may cause motor overload.
Note: The trim ring assembly cannot accomodate unlevel ceilings.
18 UNT-IOM-6
Figure 5. Trim ring assembly installation.
UNT-IOM-6 19
Startup Checklist
o 1. Ensure all panels are in place.
o 2. Tighten unions adequately if unit has a factory deluxe piping
package.
o 3. Properly vent the hydronic coil to allow water flow through the
unit.
o 4. Set water flow to the unit properly if unit piping has the circuit
setter valve.
o 5. Check strainers (if supplied) for debris after applying system
water.
o 6. Install the auxiliary drain pan and route the main drain pan
hoses to the auxiliary drain pan on vertical fan-coil units.
o 7. Ensure all grille options are in place.
External Insulating
Requirements
o 8. Ensure the air filter is in place.
o 9. Set the damper position to allow the fresh air requirement on
units with a fresh air damper.
Note: Some circumstances may require the unit to run before building
construction is complete. These operating conditions may be beyond
the design parameters of the unit and may adversely affect the unit.
Insulate all cold surfaces to prevent condensation. Moisture mixed
with accumulated dirt and organic matter may create an amplification
site for microbial growth (mold) causing unpleasant odors and healthrelated indoor air quality (IAQ) problems.
The Trane Company recommends field-insulation of the following
areas to prevent potential condensate and IAQ problems:
1. Supply and return water piping connections
2. Condensate drain lines and connections
3. Fresh air intake duct connections
4. Discharge duct connections
5. Wall boxes
20 UNT-IOM-6
Piping
Units with
Hydronic Coil
Connections Only
Piping Considerations
Before installing field piping to the coil, consider the following .
· All coil connections are 5/8 inch O.D. (or 1/2 inch nominal) female
copper connections.
· The supply and return piping should not interfere with the auxiliary
drain pan or condensate line. See Connecting the Condensate
Drain section on page 25 for more detailed information.
· The installer must provide adequate piping system filtration and
water treatment.
· Condensate may be an issue (fan-coils only) if field piping does not
have a control valve.
Refer to Figure 6 for supply and return header locations.
CAUTION: When using a field supplied piping
!
package in a fan-coil unit, allow sufficient room to install
the auxiliary drain pan. In addition, piping package must
not extend over edges of auxiliary drain pan.
S
R
S
2-Pipe
4-Pipe (C)
R
Air flow
2-Pipe
4-Pipe (C)
R
Air flow
Left end view of coil
Figure 6. Supply and return header locations on the hydronic
coil.
Connecting field piping to coil:
1. Slide a 1/2 inch sweat connection coupling (installer provided) onto
the coil headers.
2. Remove the auxiliary drain pan, if it is in place, to prevent exposure
to dripping solder or excessive temperatures.
UNT-IOM-6 21
S
R
4-Pipe (H)
S
4-Pipe (H)
Right end view of coil
Units with Steam
Coils
Note: For vertical fan-coil units, push the main condensate drain
hose and overflow condensate drain hose through to the inside of the
chassis end panel to prevent them from being burned when making
sweat connections. Be sure to pull the hoses back through and route
to the auxiliary drain pan when the end panel has cooled.
3. Solder the joint using bridgit lead-free solder (ASTM B32-89) to
provide a watertight connection. Avoid overheating factory soldered
joints when soldering field connections to the coil to prevent
leakage from occurring.
4. Insulate all piping to coil connections as necessary after connections are complete.
Note: Maintain a minimum distance of one foot between the reduction
fitting for the 1/2 inch diameter line and the fan-coil unit piping
connections.
Install the auxiliary drain pan, which ships in the accessory packet
CAUTION: In all steam coil installations, the con-
!
densate return connections must be at the low point of
the coil to ensure condensate flows freely from the coil
at all times. Failure to do so may cause physical coil
damage from water hammer, unequal thermal stresses,
freeze-up and/or corrosion.
1. Make piping connections to the steam coil as shown in Figure 7.
Cap the unused connection.
2. The coil is already pitched within the unit to provide proper pitch to
drain condensate out of the coil. Ensure that the unit has been
properly leveled. Refer to page 13 for unit leveling instructions.
3. Install a 1/2 inch, 15-degree swing check vacuum breaker in the
unused condensate return tapping as close as possible to the coil.
Figure 7. Steam coil header ports. The center port is the supply
connection. The return port is below the supply. The top port
must be closed off.
22 UNT-IOM-6
4. Vent the vacuum breaker line to atmosphere or connect it into the
return main at the discharge side of the steam trap.
5. Pitch all steam supply and return mains down a minimum of 1 inch
per 10 feet in the direction of flow.
6. Do not drain the steam mains or take-off through the coils. Drain
the mains ahead of the coils through a steam trap to the return line.
7. Overhead returns require 1 psig of pressure at the steam trap
discharge for each 2-foot elevation to ensure continuous condensate
removal.
8. Proper steam trap selection and installation is necessary for
satisfactory coil performance and service life. For installation, use the
following steps:
a. Locate the steam trap discharge at least 12 inches below the
condensate return connection. This provides sufficient hydrostatic
head pressure to overcome trap losses and ensure complete condensate removal.
b. Trane Company recommends using flat and thermostatic traps
because of gravity drain and continuous discharge operation.
c. Use float and thermostatic
traps with atmospheric pressure
gravity condensate return, with
automatic controls or where the
ST = Strainer
FT = Float and
thermostatic
steam trap
MV = Manual
air vent
GV= Gate valve
VB = Vacuum
breaker, 15°
swing check
valve
possibility of low pressure supply
steam exists.
d. Always install strainers as
close as possible to the trap inlet
side.
Reference Figure 8 for an example of a properly piped steam
coil.
Figure 8. Example of typical piping to the steam coil.
UNT-IOM-6 23
Factory Piping
Package
Connections
Before installing water piping supply and return lines to factory
piping package, note the following items.
· All piping connections are 5/8 inch O.D. (1/2 inch nominal) female
copper connections.
Piping Considerations
Connecting Water Piping to
Factory Piping Package
· The fan-coil supply and return piping should not interfere with the
auxiliary drain pan or condensate line. See Connecting the
Condensate Drain section on page 25 for more information.
· The installer must provide adequate piping system filtration and
water treatment.
· If the unit has a factory deluxe piping package, the piping includes
a strainer with a 20 mesh size screen, which allows minimal
protection from debris. Therefore, clean the strainer regularly.
NOTE: Maintain a minimum distance of one foot between the
reduction fitting for the 1/2 inch diameter line and the fan-coil piping
connections.
1. The factory piping package ships with brackets to adequately
support the piping during shipment. Remove these brackets before
connecting water piping to the unit. See Figure 9.
2. Close the piping end valves to the fully open position to prevent
damage to the valve seat during brazing.
3. Remove the auxiliary drain pan, if it is in place, to prevent exposure to dripping solder or excessive temperatures.
4. Solder water piping connections to supply and return end
connections. Avoid overheating
factory soldered joints to
prevent the possibility of
leakage.
5. Insulate fan-coil piping to
auxiliary drain pan connections
and any piping that is not above
the auxiliary drain pan.
Figure 9. Remove the shipping
brackets which support the
factory piping package before
connecting piping.
24 UNT-IOM-6
Installing the
Auxiliary Drain
Pan
The auxiliary drain pan ships loose with a fan-coil unit with factory
piping. To install the auxiliary drain pan, insert the tabs, located on
the side of the drain pan, into the slots located in the chassis end
panel. Slide the pan into the narrow groove section to lock into place.
See Figures 10 and 11. Make sure the auxiliary pan is pushed all the
way into the fully locked position.
Note: The function of the auxiliary drain pan is to collect condensate
from the main drain pan and the factory installed piping package only.
It also provides a convenient field connection for the condensate
drain line for units without factory piping. Moreover, the auxiliary drain
pan may not be adequate to collect condensate from a field-installed
piping package. Apply additional insulation as needed.
Connecting the
Condensate Drain
Figure 10. Insert the auxiliary
drain pan tabs into these slots
in the fan-coil chassis end
panel.
1. De-burr the pipe end before making the connection to the drain pan.
2. Connect a 7/8 inch O.D. copper pipe or tube, with a 0.20 inch wall
thickness, to the auxiliary drain pan. This should be a mechanical
connection that allows easy removal of the auxiliary drain pan when
servicing the piping end pocket.
3. Slide the copper pipe over the drain pan nipple and tighten the
collar on the pipe with a hose clamp (installer supplied).
Maintain a continuous drain line pitch of 1 inch per 10 feet of drain line
run to provide adequate condensate drainage. Extend the drain line
straight from the drain pan a minimum distance of 6 inches before
making any turns. The installer must provide proper support for the
drain line to prevent undue stress on the auxiliary drain pan.
Install a secondary overflow drain line if necessary by punching out
the overflow drain nipple on the auxiliary drain pan. Next, place a 3/8
Figure 11. The horizontal
auxiliary drain pan in its
installed position.
UNT-IOM-6 25
inch inside diameter flexible plastic tube over the nipple and secure
with a field supplied hose clamp.
Note: The installer is responsible for adequately insulating field
piping. See the External Insulating Requirements section on page 20
for more information.
Condensate
Overflow
Detection Device
Automatic
Changeover
Sensor
The condensate overflow detection device is an option on fan-coil
units with either a Tracer
The float switch, mounting bracket, and coiled leads ship attached
inside the piping end pocket of the unit. Install the switch by placing
the hole or slot in the bracket over the condensate overflow drain (of
the auxiliary drain pan) with the switch float extending over the pan.
Secure the drain pan by attaching the pans bracket with the factory
provided clip. See Figures 12 and 13.
Figure 12. Condensate
overflow switch installed in a
vertical auxiliary drain pan.
Two-pipe changeover units with either the Tracer
ZN.520 or TUC control have an automatic changeover sensor that
determines heating or cooling mode based on the supply water
temperature. On units with a factory piping package, the factory
straps the changeover sensor to the piping supply water pipe. See
Figure 14 on page 27.
®
ZN.010, ZN.510, ZN.520 or TUC control.
Figure 13. Condensate
overflow switch installed in a
horizontal auxiliary drain pan.
®
ZN.010, ZN.510,
If the unit does not have a factory piping package, the factory attaches the sensor and coiled lead wires to the piping side end panel.
The installer should attach the sensor parallel to and in direct contact
with the supply water pipe.
Note: The installer is responsible to ensure the changeover sensor is
installed in a location that can sense active water temperature.
Otherwise, the unit may fail to sense the correct operating mode and
disable temperature control.
26 UNT-IOM-6
When using field supplied 3-way valves, position the changeover
sensor upstream of the valve on the supply water pipe.
Recommendation: When using field supplied 2-way control
valves, attach the changeover sensor in a location that will
detect an active water temperature. The unit must always be
able to sense the correct
system water temperature,
regardless of the control valve
position.
Note: The maximum length of
the automatic changeover wire
cannot exceed 10 feet from the
control panel. If the sensor
extends beyond the unit chassis,
use shielded conductors to
eliminate radio frequency
interference (RFI).
Figure 14. The changeover
sensor strapped to the supply
water pipe.
Automatic Electric
Heat Lockout
Switch (Fan-coil)
Two-pipe fan-coil units with auxiliary electric heat have an automatic
electric heat lockout switch that disengages the electric heat when
hydronic heat enables. If the unit has a factory piping package and
electric heat, the factory attaches the switch to the supply water
pipe. When the lockout switch detects the supply water temperature
above 95° F, it disengages the
electric heat. This eliminates
electric heat and hydronic heat
working simultaneously.
If the fan-coil unit does not have
a factory piping package, the
factory attaches the switch and
coiled lead wires to the piping
side end panel. The installer
should position the lockout
switch on the supply water line of
the unit by sliding its spring
connector over the pipe.
See Figure 15.
Figure 15. Units with electric
heat have an electric heat
lockout switch on the supply
water pipe.
UNT-IOM-6 27
Venting the Hydronic
Coil
The hydronic coil contains a vent, either manual or automatic, to
release air from the unit. This vent is not sufficient for venting the
water piping system in the building.
Locate the coil air vent on the piping side, above the coil connections
on the unit. Perform the following steps to vent the coil after installing
the unit. See Figure 16.
1. Pressurize the building piping system with water and vent any
trapped air at system vents.
2. For units with manual air vents, back the set screw out to expel air
from the unit and then re-tighten the set screw.
The automatic air vent should require no adjustment for the coil to
vent. However, if the coil does not vent immediately, unscrew the outer
portion of the fitting to expel air from the port.
If debris has become trapped in the vent, completely remove the outer
portion of the fitting and clean.
Figure 16. The hydronic coil air vent is above the coil
connections. A horizontal unit is on the left and a vertical on
the right.
28 UNT-IOM-6
Balancing The Manual
Circuit Setter Valve
The manual circuit setter valve is an optional end valve supplied on
the return pipe of the factory piping package. The valve allows the
operator to regulate water flow through the hydronic coil, balance the
water flow through the unit with other units in the piping system, and
serves as a shutoff or end valve. See Figure 17.
Follow the procedure below to set maximum water flow through the
coil.
1. Establish water flow through the coil. Perform an open override of
the valve if the control valve is closed to the coil, either manually or
®
by Tracer
.
If the piping package has 2-position, normally closed valves:
Drive open the valve using a 24V signal.
If the piping package has 2position, normally open
valves:
Manually drive open the valve by
removing power to the valve.
If the piping package has
modulating valves:
To manually drive the valve open,
depress the button stem on top
of the valve and push the lever
located on the side of the valve to
Figure 17. Manual circuit setter
valve.
the full open position.
2. For presetting, use the appropriate valve curve shown in Figure 19
on page 30 to determine which setting is necessary to achieve the
appropriate pressure drop.
3. Carefully remove the Schrader pressure port connection caps on
the manual circuit setter, since they will be at the same temperature
as the pipeline.
4. Bleed all air from the hoses and meter before reading the pressure
drop. Refer to the gauge operating instructions.
5. Adjust the circuit setter valve by turning the valve stem until the
appropriate pressure drop is achieved. See Figure 18 on page 30.
6. After achieving the proper setting, slightly loosen the two socket
head cap screws and rotate the memory stop around until it
touches the back side of the indicator. Then tighten the screws to
UNT-IOM-6 29
securely set the open memory position. The memory stop indicates
the last set open position.
7. If using a 3-way valve: close the control valve to the coil, with the
differential pressure meter still
connected. This will divert flow to
the bypass side of a 3-way valve.
Adjust the balancing fitting to
obtain the same pressure drop
across the circuit setter valve as
in step 2 when the control valve
was open to the coil.
Figure 18. Close-up view of
manual circuit setter valve.
Figure 19. Setting the manual circuit setter valve, differential
pressure vs. flow.
30 UNT-IOM-6