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 Information3 Cabinet Styles4 Model Number Description6 Receiving and Handling9 Jobsite Storage10 Installation Considerations11 Service Access12 Installation Checklist13 Vertical Units15 Installing the Unit15 Horizontal Units16 External Insulating Require-

ments20 Startup Checklist20 Units with Hydronic Coil Connec-

tions Only21 Piping21 Units with Steam Coils22 Factory Piping Package Connec-

tions24 Installing the Auxiliary Drain

Pan25 Condensate Overflow Detection

Device26 Automatic Changeover Sensor26 Automatic Electric Heat Lockout

Switch (Fan-coil) 27 Ductwork Recommendations32 Duct Connections32 Supply Power Wiring33 Electrical Connections33 Wall Mounted Control Interconnec-

tion Wiring35 Electrical Grounding Restric-

tions35 Fan Mode Switch 36 Installation36 Installing Wall Mounted Con-

trols36 Zone Sensor Installation37 Fan Mode Switch39 Tracer® ZN.010 and ZN.51040 Thermostat Module Operating

Information41 Binary Inputs42 Binary Outputs43 Analog Inputs44 Fan Mode Switch44 Zone Sensors44 Supply Fan Operation45 LED Activity46 Troubleshooting46 Yellow COMM LED47 Manual Output Test48 Diagnostics50 Resetting Diagnostics51

Troubleshooting 53 Tracer® ZN.52059 Troubleshooting83 Troubleshooting85 Tracer® Communication Wiring

88

Service Communication Wiring

89

Wall-Mounted Zone Sensor

Module89 TUC Human Interface90 Cooling and Heating Operation92 TUC Sequence of Operation92 Fan Mode Operation93 Entering Water Temperature

Sampling Function94 2-Pipe with Auxiliary Electric Heat

(Fan-coils)94 Fresh Air Damper Options95 BIP4: Low Temperature Detection

Option97 BIP3: Condensate Overflow

Detection Device97 BIP4: Smoke Input98 BIP1: External Interlock98 BIP3: Occupied/Unoccupied

Mode98 BIP2: Motion Detection99 Autocycle Test99 Reading Diagnostics 101 Reading the Operating Machine

State 102 Reading the Operating Control

Mode104 Resetting Diagnostics107 Diagnostics107 Unit Mode Listed as Standby108 Troubleshooting 109 Maintenance Procedures116 Periodic Maintenance Check-

list116 Maintenance116 Inspecting and Cleaning Drain

Pans118 Winterizing the Coil 120 Inspecting and Cleaning Coils121 Inspecting and Cleaning the

Internal Insulation on Fan-

Coils123 Inspecting and Cleaning the

Fan124 Fan Board Assembly Removal126 Factory Piping Packages128 Appendix128 Typical Wiring Diagrams129-134

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 units 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

Digits 57 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

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

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 receivers 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 carriers 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

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.

36 in.

12 in. both sides

24 in.

28 in.

6 in.

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.

15.5 in.

Low Vertical Cabinet & Concealed

Size L (in.)

03 26 1/4 04 35 3/4 06 44 1/4

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 units 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 units options.

UNT-IOM-6 17

Cabinet units:

Install the bottom panel by placing the hinged end on the units 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 units 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 panels 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.

2-Pipe 4-Pipe (C)

Air flow

2-Pipe 4-Pipe (C)

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.

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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.

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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.

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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.

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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.

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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 pans 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.

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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.

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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.

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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

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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.

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