Trane LO User Manual

Download

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.

UNT-IOM-6 21

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 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.

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

Balancing The Automatic Circuit Setter Valve

The automatic flow valve is an optional end valve on the return of the factory piping package. See Figure 20. The valve regulates water flow through the coil to a specific (gpm) flow rate, as ordered by the customer.

The automatic flow valve controls to the specified flow rate, provided that the pressure drop across the valve is within a certain range. To verify that the valve is operating properly, remove the protective caps from the P/T ports and measure the pressure drop across the valve with a differential pressure meter. Carefully remove the P/T port connection caps, since they will be at the same temperature as the pipeline. The reading should be within the given ranges in Table 2. If the pressure drop is not within the ranges listed, the valve will not control water flow. If the valve orifice becomes clogged with debris, remove water from piping and then remove the cap of the valve body and push on the piston to dislodge any foreign matter. If this is not successful, remove the cartridge and clean.

Figure 20. Automatic circuit setter valve.

Table 2. Automatic Circuit Setter Flow Rate Range.

Valve gpm Pressure Drop Range (psig)

0.5 to 8.0 2 to 32 9 to 12 5 to 50

Replace the cartridge in the field without breaking the piping line to furnish a higher or lower gpm. To do this, remove the water from the system. Remove the cap assembly containing the plug from the valve body. Grasp the cartridge by the piston to remove. Install a different spring if the pressure drop range of the valve is being changed also.

UNT-IOM-6 31

Duct Connections

The units airflow configuration varies dependent on the model and options ordered. A one-inch duct collar is provided on units with a ducted return and/or discharge to attach ductwork to the unit.

The Trane Company recommends using galvanized sheet metal ductwork with fan-coil and cabinet heater units. Slide the sheetmetal duct over the duct collar flange of the unit, seal the joint and fasten with sheetmetal screws.

Note: Do not run screws through the removable front panel on concealed units.

Install all air ducts according to National Fire Protection Association standards for the Installation of Air Conditioning and Ventilating Systems (NFPA 90A and 90B).

Ductwork Recommendations

Follow the general recommendations listed below when installing ductwork for the unit.

· Discharge ductwork should run in a straight line, unchanged in size or direction, for a minimum equivalent distance of 3 fan diameters from the unit (approximately 20 inches).

· When making duct turns and transitions avoid sharp turns and use proportional splits, turning vanes, and air scoops when necessary.

· When possible, construct, and orient supply ductwork turns in the same direction as the fan rotation.

32 UNT-IOM-6

Electrical Connections

Supply Power Wiring

Refer to the unit nameplate to obtain the minimum circuit ampacity (MCA) and maximum fuse size (MFS) or maximum circuit breaker (MCB) to properly size field supply wiring and fuses or circuit breakers. See Figure 2 on page 6 to reference the nameplate location. Refer to the unit operating voltage listed on the unit wiring schematic, submittal, or nameplate. Reference the wiring schematic for specific wiring connections.

WARNING: Hazardous voltage! Disconnect all

electric power including remote disconnects before servicing. Failure to do so may cause severe personal injury or death.

Wiring diagrams are attached to the unit in a plastic bag and can be be easily removed for reference. Wiring schematics are attached as follows:

· Vertical cabinet & recessed units: Schematics are on the inside of the front panel. See Figure 21.

· Vertical concealed & all horizontal units: Locate schematics on the fan and motor panel of unit. See Figure 22.

CAUTION: Use copper conductors only! Unit

terminals are not designed to accept other types of conductors. Failure to do so may cause damage to the equipment.

Figure 21. Locate the wiring schematic on the inside of the front panel of vertical cabinet and recessed units.

Figure 22. Locate the wiring schematic on the fan and motor panel of vertical concealed and all horizontal units. (This unit is turned on

it's side.)

UNT-IOM-6 33

All field wiring should conform to NEC and all applicable state and local code requirements.

The control panel box is always on the end opposite the piping connections. Access the control box by removing the two screws that secure the front cover. If the unit has a terminal unit control board (TUC), remove the screw in the top right corner of the panel. This will allow the panel to pivot downward to provide access to the electrical components. See Figure 23.

WARNING: Insulate all power wire from sheetmetal

Figure 23. The terminal unit control (TUC) board pivots downward to provide service access.

ground. Failure to do so may cause electrical shorts resulting in personal injury or death.

Units have one of three different connection points, depending on the unit type and options.

1. Power & ground inside of control box:

If the unit has a fan mode switch, Tracer

ZN.010 or ZN.510 control without a disconnect switch, the power leads and capped ground wire are inside the control panel.

2. Power & ground inside the junction box: If the unit has a TUC control without a disconnect switch, the power leads and capped ground wire are inside the junction box on the control panel.

3. Power wired to switch on junction box & ground inside of junction box: If the unit has a disconnect switch, the power leads wire to the junction box switch on the control panel. Pull the capped ground wire into the junction box.

34 UNT-IOM-6

Electrical Grounding Restrictions

All sensor and input circuits are normally at or near ground (common) potential. When wiring sensors and other input devices to the Tracer ZN.010, ZN.510, ZN.520 or TUC, avoid creating ground loops with grounded conductors external to the unit control circuit. Ground loops can affect the measurement accuracy of the controller.

CAUTION: Unit transformer IT1 provides power to

fan-coil unit only. Field connections to the transformer IT1 may create immediate or premature unit component failure.

All input/output circuits (except isolated relay contacts and optically isolated inputs) assume a grounded source, either a ground wire at the supply transformer to control panel chassis, or an installer supplied ground.

Note: Do not connect any sensor or input circuit to an external ground connection.

Wall Mounted Control Interconnection Wiring

The installer must provide interconnection wiring to connect wall mounted devices such as a fan mode switch or zone sensor module. Refer to the unit wiring schematic for specific wiring details and pointto-point wiring connections. Dashed lines indicate field wiring on the unit wiring schematics. All interconnection wiring must conform to NEC Class 2 wiring requirements and any state and local requirements. Refer to Table 3 for the wire size range and maximum wiring distance for each device.

Recommendation: Do not bundle or run interconnection wiring in parallel with or in the same conduit with any high-voltage wires (110V or greater). Exposure of interconnection wiring to high voltage wiring, inductive loads, or RF transmitters may cause radio frequency interference (RFI). In addition, improper separation may cause electrical noise problems. Therefore, use shielded wire (Beldon 83559/83562 or equivalent) in applications that require a high degree of noise immunity. Connect the shield to the chassis ground and tape at the other end.

Table 3. Maximum Wiring Distances, ft (m)

Device Wire Size Range Max. Wiring Distance

Fan Mode Switch 14 - 22 AWG 500 (152.4) Zone Sensor Module 16 - 22 AWG

200 (60.96)

UNT-IOM-6 35

Installing Wall Mounted Controls

Wall mounted controls, which include the fan mode switch and the zone sensor module, ship loose inside the unit accessory bag.

Position the controller on an inside wall 3 to 5 feet above the floor and and at least 18 inches from the nearest outside wall. Installing the controller at a lower height may give the advantage of monitoring the temperature closer to the zone, but it also exposes the controller to airflow obstructions. Ensure that air flows freely over the controller.

Avoid mounting the controller in an area subject to the following conditions:

· Dead spots such as behind doors or in corners that do not allow free air circulation.

· Air drafts from stairwells, outside doors, or unsectioned hollow walls.

· Radiant heat from the sun, fireplaces, appliances, etc.

Fan Mode Switch Installation

Figure 24. Fan Mode Switch

· Airflow from adjacent zones or other units.

· Unheated or uncooled spaces behind the control, such as outside

walls or unoccupied spaces.

· Concealed pipes, air ducts, or chimneys in partition spaces behind the controller.

The fan mode switch ships loose inside the unit accessory bag. Follow the steps below to install the fan mode switch.

Items needed: 2 x 4 electrical junction box

1.Remove the brown wire if not using a field-supplied damper. Remove the terminals, cut and strip wires as required for installation.

2.Level and position a 2 x 4 electrical junction box. Follow the instructions given in the Interconnection Wiring section and route the wires as shown in the wiring diagram. Refer to the typical wiring diagram on page 101 or to the unit specific diagram on the unit.

3.Position the fan mode switch over the junction box with the two screws supplied.

36 UNT-IOM-6

Zone Sensor Installation

Follow the procedure below to install the zone sensor module. Reference Figure 25 on page 38 when installing the wall mounted zone sensor.

1. Note the position of the setpoint adjustment knob and gently pry the adjustment knob from the cover using the blade of a small screwdriver.

2. Insert the screwdriver blade behind the cover at the top of the module and carefully pry the cover away from the base.

3. To install the zone sensor module without a junction box (directly to the wall):

a. Using the module base as a template, mark the the rectangular cutout for the control wiring and module installation holes. Ensure the base is level. b. Set the base aside and make the cutout. Then, drill two 3/16 inch diameter holes approximately 1 inch deep. Insert and fully seat the plastic anchors. c. Pull the control wires through the cutout and attach the module to the wall using the screws provided.

4. To install the zone sensor module to a standard junction box: a. Level and install a 2 inch x 4 inch junction box (installer supplied) vertically on the wall. b. Pull the control wires through the cutout. Attach the module to the wall using the screws provided.

5. Strip the insulation on the interconnection wires back 0.25 inch and connect to TB1. Screw down the terminal blocks.

6. Replace the zone sensor cover and adjustment knob.

Before beginning installation, follow the wiring instructions in the Wall Mounted Control Interconnection Wiring section on page 34. Also, refer to the unit wiring schematic for specific wiring details and point connections.

If installing a TUC zone sensor, see the TUC sections regarding communication wiring beginning on page 60 for more detailed information.

UNT-IOM-6 37

Wall mounted zone sensor Model # Digit 31 = W

Figure 25. Wall mounted zone sensor dimensions.

Split-mounted option: Wall mounted setpoint dial with unit mounted fan mode switch Model # Digit 31 = X

Figure 26. Resistance temperature curve for the zone sensor, entering water temperature sensor, and discharge air sensor.

38 UNT-IOM-6

Fan Mode Switch

Manual Fan Mode Switch

The manual fan mode switch is available for fan-coil units that do not have Trane factory-mounted control packages. This four-position switch (off-hi-med-lo) allows manual fan mode selection and is available unit or wall mounted.

The unit-mounted option (Digit 31 = D) operates on line voltage. The wall-mounted option (Digit 31 = K) is low-voltage and has three 24 volt relays using a factory-wired transformer and relays to control the fan motor.

Sequence of Operations

Off: Fan is turned off, two-position damper option spring-returns

closed. Hi, Med, Lo: Fan runs continuously at the selected speed. The twoposition damper option opens to an adjustable mechanical stopposition.

UNT-IOM-6 39

Tracer® ZN.010 and ZN.510

The Tracer® ZN.010 is a stand-alone device that controls fan-coils and cabinet heaters. The Tracer ZN.510 can be stand-alone or utilize peer-to-peer communications. The controller is easily accessible in the control end panel for service. The control end panel is on the end of the unit opposite the piping. Reference Figure 27.

Figure 27. The Tracer ZN.010 board.

Sequence of Operations

Off: Fan is off; control valves and fresh air damper option close. Low

air temperature detection option is still active.

Auto (Fan Cycling): Fan and fresh air damper cycle with control valve option to maintain setpoint temperature. In cooling mode, the fan cycles from off to medium and in heating mode it cycles from off to low. When no heating or cooling is required, the fan is off and the fresh air damper option closes.

Low/Med/High (Continuous Fan): Fan operates continuously while control valve option cycles to maintain setpoint temperature. Fresh air damper option is open.

40 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Operating Information

Power-Up Sequence

Entering Water Temperature Sampling Function

When 24 VAC power is initially applied to the Tracer® ZN.010 or ZN.510, the following sequence occurs:

1. All outputs are controlled off.

2. Tracer initial values.

3. The random start time (0-25 seconds) expires.

4. Normal operation begins.

Both Tracer sampling function to test for the correct water temperature for the unit operating mode. For all applications not involving changeover, the water temperature does not effect the unit operation.

The entering water temperature sampling function opens the main hydronic valve, waits no more than three minutes to allow the water temperature to stabilize, then measures the entering water temperature to see if the correct water temperature is available.

The entering water must be five degrees or more above the space temperature to allow hydronic heating and five degrees or more below the space temperature to allow hydronic cooling.

If the correct water temperature is available, the unit begins normal heating or cooling operation. If the measured entering water temperature is too low or high, the controller closes the valve and waits 60 minutes before attempting to sample the entering water. Reference Table 4.

ZN.010 and ZN.510 reads all input values to detemine

ZN.010 and ZN.510 use an entering water temperature

Table 4. Unit Mode as Related to Water Temperature

Unit Type EWT Sensor Required? Coil Water Temperature

2-pipe changeover Yes

4-pipe changeover Yes

2-pipe heating only No

2-pipe cooling only No

4-pipe heat/cool No

UNT-IOM-6 41

· Can cool if: space temp - EWT

· Can heat if: EWT - space temp

· Can cool if:

space temp - EWT

· Can heat if: EWT - space temp

Hot water assumed

Cold water assumed

·Cold water assumed in main coil

·Hot water assumed in aux. coil

³ 5 deg F

Tracer® ZN.010 and ZN.510

Binary Inputs

BIP1: Low Temperature Detection Option

BIP2: Condensate Overflow Detection Option

The factory hard wires the low temperature detection sensor to binary input #1 (BIP1) on the Tracer defaults normally closed (N.C.), and will trip off the unit on a low temperature diagnostic when detecting low temperature. In addition, the Tracer

Note: See the Diagnostics section on page 50 for more information.

The factory hard wires the condensate overflow sensor to binary input #2 (BIP2) on the Tracer normally closed (N.C.), and will trip off the unit on a condensate overflow diagnostic if condensate reaches the trip point. In addition, the Tracer

Reference Table 6 for the Tracer outputs.

ZN.010 and ZN.510 control unit devices as listed below:

Fan: Off Valves: Open Electric heat: Off Damper: Closed

ZN.010 and ZN.510 control unit devices as listed below:

Fan: Off Valves: Closed Electric heat: Of

ZN.010 and ZN.510. The sensor

ZN.010 and ZN.510. The sensor defaults

ZN.010 and ZN.510s six binary

BIP3: Occupancy Sensor

42 UNT-IOM-6

Binary input #3 (BIP3) on Tracer® ZN.010 and ZN.510 is available for field- wiring an occupancy sensor, such as a binary switch or a timeclock, to detect occupancy. The sensor can be either normally open or normally closed. Reference Table 5 on page 43.

Tracer® ZN.010 and ZN.510

Table 5. Occupancy Sensor State Table

Sensor Type Sensor Position Unit Occupancy Mode

Normally Open Open Occupied Normally Open Closed Unoccupied Normally Closed Open Unoccupied Normally Closed Closed Occupied

Binary Outputs

Table 6. Binary Outputs

Binary Output Description Pin

BOP1 Fan high speed J1-1 BOP2 Fan medium speed J1-2 BOP3 Fan low speed J1-4 BOP4 Main valve J1-5 BOP5 Auxiliary valve/electric heat J1-6 BOP6 2-position fresh air damper J1-7

Notes:

1. In a four-pipe application, BOP4 is used for cooling and BOP5 is used for heating.

2. If no valves are ordered with the unit, the factory default for the Tracer BOP4 configured as normally closed BOP5 configured as normally open

3. If the fresh air damper option is not ordered on the unit, BOP6 will be configured as none.

ZN.010 and ZN.510 controller are:

UNT-IOM-6 43

Tracer® ZN.010 and ZN.510

Analog Inputs

Table 7. Analog Inputs Available

Analog Input Description Application

Zone Space temperature Space temperature detection

Set Local setpoint Thumbwheel setpoint

Fan Fan mode input Zone sensor fan switch

Analog input 1 (AI1) Entering water temperature Entering water temperature detection

Analog input 2 (AI2) Discharge air temperature Discharge air temperature detection

Notes:

1.The zone sensor, entering water temperature sensor, and the discharge air temperature sensor are 10KW thermistors. Figure 26 on page 38 provides the resistance-temperature curve for these thermistors.

2. Zone Sensor: Wall mounted sensors include a thermistor soldered to the sensors circuit board Unit mounted sensors include a return air sensor in the units return air stream.

3. Changeover units include an entering water temperature sensor.

Both Tracer® ZN.010 and ZN.510 accept a maximum of five analog inputs. Reference Table 7.

Zone Sensors

Fan Mode Switch

44 UNT-IOM-6

The zone sensors available with the Tracer® ZN.010 and ZN.510 provide up to three different inputs

1. Space temperature measurement (10K thermistor)

2. Local setpoint

3. Fan mode switch

Wall mounted zone sensors include a thermistor as a component of the internal printed circuit board. Unit mounted zone sensors use a sensor placed in the units return air stream.

Each zone sensor is equipped with a thumbwheel for setpoint adjustment.

The zone sensor may be equipped with a fan mode switch. The fan mode switch offers selections of off, low, medium, high, or auto. Reference Table 8 on page 45 for fan mode operation.

Tracer® ZN.010 and ZN.510

Supply Fan Operation

Table 8. Fan Mode Operation

Heating Mode Cooling Mode Fan Mode Occupied Unoccupied Occupied Unoccupied

Off Off Off Off Off

Low Low Off/high (3) Low Off/high (3)

Medium Medium Off/high (3) Medium Off/high (3)

High High Off/high (3) High Off/high (3)

Auto

Continuous Heat default Off/high (3) Cool default Off/high (3)

CyclingOff/heat default Off/high (3) Off/cool default Off/high (3)

Notes:

1. During the transition from off to any fan speed but high, Tracer starts the fan on high speed and runs for three seconds before transitioning to the selected speed (if it is other than high). This provides enough torque to start all fan motors from the off position.

The Tracer® ZN.010 and ZN.510 will operate in either continuous fan or fan cycling mode. The fan cycles when the fan mode switch is placed in auto. The fan runs continuous when placed in the high, medium, or low position. Use Rover, installation and service tool, to change the auto defaults.

ZN.010 and ZN.510 automatically

2. When the heating output is controlled off, ZN.010 and ZN.510 automatically controls the fan on for an additional 30 seconds. This delay allows the fan to dissipate any residual heat from the heating source, such as electric heat.

3. Whenever two states are listed for the fan: The first state (off) applies when there is not a call for heating or cooling. The second state (varies) applies when there is a call for heating or cooling. The heat default is factory configured for low fan speed, and the cool default is medium.

Table 9. Valid Operating Range and Factory Default Setpoints

Setpoint/Parameter Default Setting Valid Operating Range

Unoccupied cooling setpoint 85° F 40 to 115° F

Occupied cooling setpoint 74° F 40 to 115° F

Occupied Heating setpoint 71° F 40 to 115° F

Unoccupied heating setpoint 60° F 40 to 115° F

Cooling setpoint high limit 110° F 40 to 115° F

Cooling setpoint low limit 40° F 40 to 115° F

Heating setpoint high limit 105° F 40 to 115° F

Heating setpoint low limit 40° F 40 to 115° F

Power up control wait 0 sec 0 to 240 sec

UNT-IOM-6 45

Yellow COMM LED

Red SERVICE LED

Tracer® ZN.010 and ZN.510

Troubleshooting

Green STATUS LED

LED Activity

Red Service LED

Table 10. Red Service LED Activity

Red LED Blink Activity

LED off continuously when power is applied to the controller

LED on continuously, even when power is applied to the controller

LED flashes once every second

Figure 28. The Tracer ZN.010 board.

Description

Normal operation

Someone is pressing the service button or the controller has failed.

Use Rover, Tranes service tool, to restore the unit to normal operation. Refer to the Rover product literature for more information.

46 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Green STATUS LED

Table 11. Green STATUS LED Activity

Green LED Blink Activity Description

LED on continuously Power on (normal operation)

LED blinks once Manual output test mode

LED blinks twice Manual output test mode, with one or more diagnos-

LED blinks (1/4 second on, 1/4 second off for 10 seconds) Wink mode

LED off · Power off

Note: The wink feature allows the identification of a particular controller. When sending a request from a device, such as Rover, the controller will wink to indicate it received the signal.

The green LED normally indicates whether the controller is powered on (24 VAC supplied). Reference Table 11.

tic present

· Abnormal condition

· Test button is pressed

Yellow COMM LED

Table 12. Yellow COMM LED Activity

Yellow LED Blink Activity Description

LED off continuously The controller is not detecting any communication.

(Normal for units in standalone applications)

LED blinks The controller detects communication.

LED on continuously Abnormal condition

UNT-IOM-6 47

Tracer® ZN.010 and ZN.510

Manual Output Test

Manual Output Test Procedure

The purpose of the manual output test sequence is to verify output and end device operation. Use the manual output test to:

· Verify output wiring and operation without using Rover, service tool.

· Force the water valve to open and balance the hydronic system.

Note: The manual output test is not an automatic cycle. You must press the Test button to proceed through each step.

The controller observes all diagnostics that occur during the test sequence. Although an automatic diagnostic reset sequence exists as part of the controllers normal operation, the automatic diagnostic reset feature is not active during the test sequence.

If left in an individual test step, the controller remains in test mode for 60 minutes and then exits to normal operation.

Many service calls are due to unit diagnostics. The test sequence resets unit diagnostics and attempts to restore normal unit operation prior to testing the outputs. If the diagnostics remain after a reset, the STATUS LED indicates the diagnostic condition is still present (two blinks). See the Green STATUS LED section in Table 11 on page 47.

Follow the procedure below to test the Tracer controller.

ZN.010 and ZN.510

1. Press and hold the Test button for at least two seconds (not exceeding 5 seconds), and then release, to start the test mode.

2. The test sequence will turn off all outputs and then attempt to clear all diagnostics.

3. Press the Test button several more times (no more than once per second) to advance through the test sequence.

The outputs are not subject to minimum times during the test sequence. However, the test sequence only permits one step per

second which limits minimum output time.

The green LED is turned off when the Test button is pressed. To begin the manual output test mode, press and hold the Test button (turning off the green LED) for at least two seconds.The green LED will begin to blink, indicating the controller is in test mode.

48 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Table 13. Test Sequence for 1-Heat /1-Cool Configurations

Steps Fan Cool Output Heat Output Damper

BOP1-3 BOP4 (1) BOP5 BOP6

1. Off Off Off Off Closed

2. Fan High High Off Off Closed

3. Fan Medium Medium Off Off Closed

4. Fan Low Low Off Off Closed

5. Cool High On Off Closed

6. Heat High Off On Closed

7. Fresh Air High Off Off Open Damper (3)

8. Exit (2)

Notes:

(1) At the beginning of step 2, the controller attempts to clear all diagnostics.

(2) For all 1-heat/1-cool applications including 2-pipe changeover, BOP4 energizes in the cooling test stage and BOP5 energizes in the heat test stage.This occurs even though during normal 2-pipe changeover operation BOP4 controls the unit valve for both cooling and heating. (2) After the Fresh Air Damper step, the test sequence performs the Exit step.This initiates a reset and attempts to return the controller to normal operation.

(3) The fresh air damper (BOP6) only energizes during this step if binary output 6 has been configured as a fresh air damper.

UNT-IOM-6 49

Tracer® ZN.010 and ZN.510

Diagnostics

Table 14. Controller Diagnostics

Diagnostic Latching Fan Valves Elect. Heat Damper

Yes/No

Auxiliary No Enabled No action No action No action temp. failure

Condensate Yes Off Closed Off Closed overflow detection

Entering No Enabled Enabled Enabled Enabled water temp. failure

Fan mode No Enabled Enabled Enabled Enabled failure

Invalid unit Yes Disabled Disabled Disabled Disabled configuration failure

Low temp. Yes Off Open Off Closed detection

Maintenance Yes Enabled No action No action No action required

Setpoint No Enabled No action No action No action

Zone temp. No Off Closed Off Closed failure

Notes: Priority Level: Diagnostics are listed in order from highest to lowest priority. The controller senses and

records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics affect unit operation according to priority level. Latching: A latching diagnostic requires a manual reset of the controller; while a non-latching diagnostic automatically resets when the input is present and valid.

Enabled: End device is allowed to run if there is a call for it to run. Disabled: End device is not allowed to run even if there is a call for it to run. No Action: The diagnostic has no affect on the end device.

50 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Resetting Diagnostics

Automatic Reset by the Controller

There are four ways in which diagnostics are reset:

1. Automatic reset by the controller

2. By initiating a manual output test at the controller

3. By cycling power to the controller

4. Through Rover, Tranes service tool

The controller includes an automatic diagnostic reset function which attempts to automatically restore the unit when a low temperature diagnostic occurs.

Note: The controller implements the automatic diagnostic reset function only once every 24 hours. For the controller to increment the 24 hour timer, you must maintain power to the controller. Cycling power resets all timers and counters.

After the controller detects the first special diagnostic, the unit waits 30 minutes before invoking the automatic diagnostic reset function. The automatic diagnostic reset function clears the special diagnostic and attempts to restore the controller to normal operation. The controller resumes normal operation until another diagnostic occurs.

Note: The automatic diagnostic reset function does not operate during the manual output test sequence.

If a special diagnostic occurs within 24 hours after an automatic diagnostic reset, the controller must be manually reset. Other possible methods of resetting diagnostics are described in the sections that follow.

Manual Output Test

Cycling Power to the Controller

UNT-IOM-6 51

Use the controllers Test button during installation or for troubleshooting to verify proper end device operation. Press the Test button to exercise all outputs in a predefined sequence, the first of which will attempt to reset the controller diagnostics if any are present. See Table 13 on page 49 for more information about the manual output test.

After removing and reapplying the 24 VAC power from the board, the unit cycles through a power-up sequence. By default, the controller attempts to reset all diagnostics at power-up. Diagnostics present at power-up and those that occur after power-up are handled according to Table 14 on page 50.

Tracer® ZN.010 and ZN.510

Trane’s Service Tool, Rover™

Alarm Reset

Rover, Tranes service tool, can reset diagnostics present in the controller. For complete information about Rover, refer to Trane publication EMTX-IOP-2 Rover Installation, Operation and Program- ming Guide.

Any device that can communicate alarm reset information can reset diagnostics present in the controller.

52 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Troubleshooting

Table 15. Fan Outputs do not Energize

Probable Cause Explanation

Random start After power-up, the controller always observes a random start that varies observed between 0 and 25 seconds. The controller remains off until the random start

time expires.

Power-up control wait When power-up control wait is enabled (non-zero time), the controller remains

off until one of two conditions occurs:

1. The controller exits power-up control wait once it receives communicated information.

2. The controller exits power-up control wait once the power-up control wait time expires.

Cycling fan operation When the fan mode switch is in the auto postion, the unit fan cycles off when

there is no call for heating or cooling. The heating/cooling sources cycle on or off periodically with the unit fan to match the capacity according to pulse-widthmodulation (PWM) logic.

Unoccupied operation The fan cycles with capacity when the unit is in unoccupied mode. This occurs

even if the unit is in continuous fan operation. While unoccupied, the fan cycles on or off with heating/cooling to provide varying amounts of heating or cooling to the space. to match the capacity according to pulse-width-modulation (PWM) logic.

Fan mode off When using the local fan mode switch to determine the fan operation, the off

position controls the unit fan to off.

Requested mode: off It is possible to communicate the operating mode (such as off, heat, and

cool) to the controller. When off is communicated to the controller, the unit controls the fan to off. The unit is not capable of heating or cooling when the controller is in this mode.

Diagnostic present A specific list of diagnostics effects fan operation. For more information, see the

Diagnostics section on page 50.

No power to the If the controller does not have power, the unit fan will not operate. For the controller controller to operate normally, it must have an input voltage of 24 VAC. When

the green LED is off continuously, the controller does not have sufficient power or the controller has failed.

Manual output test The controller includes a manual output test sequence to verify binary output

operation and the associated wiring. However, based on the current step in the test sequence, the unit fan may not be powered on. Refer to the Manual Output Test section on page 51.

Unit wiring The wiring between the controller outputs and the fan relays and contacts must

be present and correct for normal fan operation. Refer to the typical unit wiring diagrams in the Appendix of this manual.

UNT-IOM-6 53

Tracer® ZN.010 and ZN.510

Table 16. Valves Stay Closed

Probable Cause Explanation

Normal operation The controller opens and closes the valves to meet the unit capacity require-

ments.

Requested mode: off It is possible to communicate the operating mode (such as off, heat, and

cool) to the controller. When off is communicated to the controller, the unit controls the fan to off. The unit is not capable of heating or cooling when the controller is in this mode.

Valve override The controller can communicate a valve override request. This request effects

the valve operation.

Manual output test The controller includes a manual output test sequence to verify analog and

binary output operation and the associated wiring. However, based on the current step in the test sequence, the valves may not be open. Refer to the Manual Output Test section on page 51.

Diagnostic present A specific list of diagnostics affects valve operation. For more information, see

the Diagnostics section on page 50.

Sampling logic The controller includes entering water temperature sampling logic that

automatically invokes during 2-pipe or 4-pipe changeover. It determines when the entering water temperature is either too cool or too hot for the desired heating or cooling mode. Refer to the Entering Water Temperature Sampling section on page 41.

Unit configuration The controller must be properly configured based on the actual installed end

devices and application. When the unit configuration does not match the actual end device, the valves may not work correctly.

No power to the If the controller does not have power, the valves do not operate. For the controller controller to operate normally, it must have an input voltage of 24 VAC. When the green

LED is off continuously, the controller does not have sufficient power, or the controller has failed.

Unit wiring The wiring between the controller outputs and the valve(s) must be present and

correct for normal valve operation. Refer to the typical unit wiring diagrams in the Appendix of this manual.

54 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Table 17. Valves Stay Open

Probable Cause Explanation

Normal operation The controller opens and closes the valves to meet the unit capacity require-

ments.

Valve override The controller can communicate a valve override request to affect the

valve operation.

Manual output test The controller includes a manual output test sequence that verifies analog and

binary output operation and the associated wiring. However, based on the current step in the test sequence, the valves may be open. Refer to the Manual Output Test section on page 51.

Diagnostic present A specific list of diagnostics affects valve operation. For more information, see

the Diagnostics section on page 50.

Sampling logic The controller includes entering water temperature sampling logic that automati

cally invokes during 2-pipe or 4-pipe changeover to determine if the entering water temperature is correct for the unit operating mode. Refer to the Entering Water Temperature Sampling section on page 41.

Unit configuration The controller must be properly configured based on the actual installed end

devices and application. When the unit configuration does not match the actual end device, the valves may not work correctly.

Unit wiring The wiring between the controller outputs and the valve(s) must be present and

correct for normal valve operation. Refer to the typical unit wiring diagrams in the Appendix of this manual.

UNT-IOM-6 55

Tracer® ZN.010 and ZN.510

Table 18. Electric Heat Not Operating

Probable Cause Explanation

Normal operation The controller cycles electric heat on and off to meet the unit capacity require-

ments.

Requested mode: off It is possible to communicate the operating mode (such as off, heat, cool)

to the controller. When off is communicated to the controller, the units shuts off the electric heat.

Communicated disable Numerous communicated requests may disable electric heat, including an

auxiliary heat enable input and the heat/cool mode input. Depending on the state of the communicated request, the unit may disable electric heat.

Manual output test The controller includes a manual output test sequence that verifies analog and

binary output operation and associated output wiring. However, based on the current step in the test sequence, the electric heat may not be on. Refer to the Manual Output Test section on page 51.

Diagnostic present A specific list of diagnostics affects electric heat operation. For more informa-

tion, see the Diagnostics section on page 50.

Unit configuration The controller must be properly configured based on the actual installed end

devices and application. When the unit configuration does not match the actual end device, the electric heat may not work properly.

No power to the If the controller does not have power, electric heat does not operate. For the controller controller to operate normally, a 24VAC input voltage must be applied. When

the green LED is off continuously, the controller does not have sufficient power or has failed.

Unit Wiring The wiring between the controller outputs and the electric heat contacts must

be present and correct for normal electric heat operation. Refer to the typical unit wiring diagrams in the Appendix of this manual.

56 UNT-IOM-6

Tracer® ZN.010 and ZN.510

Table 19. Fresh Air Damper Stays Closed

Probable Cause Explanation

Normal operation The controller opens and closes the fresh air damper based on the controllers

occupancy mode and fan status. Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied mode.

Warmup and cooldown The controller includes both a warmup and cooldown sequence to keep the

fresh air damper closed during the transition from unoccupied to occupied. This is an attempt to bring the space under control as quickly as possible.

Requested mode: off It is possible to communicate the operating mode (such as off, heat, cool)

to the controller. When off is communicated to the controller, the unit closes the fresh air damper.

Manual output test The controller includes a manual output test sequence that verifies analog and

binary output operation and associated output wiring. However, based on the current step in the test sequence, the fresh air damper may not be open. Refer to the Manual Output Test section on Page 51.

Diagnostic present A specific list of diagnostics effects fresh air damper operation. For more

information, see the Diagnostics section on page 50.

Unit configuration The controller must be properly configured based on the actual installed end

devices and application. When the unit configuration does not match the actual end device, the damper may not work correctly.

No power to the If the controller does not have power, the fresh air damper does not operate. For controller the controller to operate normally, a 24 VAC input voltage must be applied.

When the green LED is off continuously, the controller does not have sufficient power or has failed.

Unit wiring The wiring between the controller outputs and the fresh air damper must be

present and correct for normal damper operation. Refer to the typical unit wiring diagrams in the Appendix of this manual.

UNT-IOM-6 57

Tracer® ZN.010 and ZN.510

Table 20. Fresh Air Damper Stays Open

Probable Cause Explanation

Normal Operation The controller opens and closes the fresh air damper based on the controllers

occupancy mode and fan status. Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied mode.

Manual Output Test The controller includes a manual output test sequence that verifies analog and

binary output operation and associated wiring. However, based on the current step in the test sequence, the fresh air damper may be open. Refer to the Manual Output Test section on page 51.

Unit Configuration The controller must be properly configured based on the actual installed end

devices and application. When the unit configuration does not match the actual end device, the damper may not work correctly.

Unit Wiring The wiring between the controller outputs and the fresh air damper must be

present and correct for normal damper operation. Refer to the typical unit wiring diagrams in the Appendix of this manual.

58 UNT-IOM-6

Tracer® ZN.520

Tracer® ZN.520 is a communicating or standalone device. It is easily accessible in the control end panel for service. The control end panel is on the end opposite the piping.

Sequence of Operations

OFF: Fan is off; control valve options and fresh air damper options

close. The low air temperature detection option is still active.

Auto: Fan speed control in the auto setting allows the modulating (3wire floating point) or 2position control valve option and three-speed fan to work cooperatively to meet precise capacity requirement, while minimizing fan speed ( motor/energy/acoustics ) and valve position (pump energy, chilled water reset ). As the capacity requirement increases at low fan speed, the water valve opens. When the low fan speed capacity switch point is reached, the fan switches to medium speed and the water valve repositions to maintain an equivalent capacity. The reverse sequence takes place with a decrease in required capacity.

Tracer Summit Communication Wiring

Low/Med/High: The fan will run continuously at the selected speed and the valve option will cycle to meet setpoint.

For Tracer Tracer Summit

nication wiring in the control box at the designated terminals on the board. Reference the unit wiring diagram or submittals.

Ground shields at each Tracer each shield to prevent any connection between the shield and anther ground. Refer to Trane publication, CNT-IOP-2 Installation, Operation and Programming Guide, for the communication wiring diagram.

Communication wire must conform to the following specification:

1) Shielded twisted pair 18 AWG

2) Capacitance 23 (21-25 ) picofarads ( pF ) per foot

3) Listing/Rating  300V 150C NEC 725-2 (b) Class 2 Type

4) Trane Part No. 400-20-28 or equivalent, available through

ZN.520 controlled units that will interface with the Trane

building management system, terminate the commu-

ZN.520, taping the opposite end of

CL2P

Trane BAS Buying Group Accessories catalog.

UNT-IOM-6 59

Tracer® ZN.520

Follow these general guidelines when installing communication wiring:

1) Maintain a maximum 5000 ft. aggregate run

2) Install all communication wiring in accordance with the NEC and all local codes.

3) Solder the conductors and insulate (tape) the joint sufficiently when splicing communication wire. Do not use wire nuts to make the splice.

4) Do not pass communication wiring between buildings be cause the unit will assume different ground potentials.

5) Do not run power in the same conduit or wire bundle with communication link wiring.

Service Communication Wiring

Wall Mounted Zone Sensor Module

Zone Sensors Without Interconnecting Wiring

Establish service communication using Rover service software connected to the Tracer the following connection points.

1) Remote zone sensor module

2) Connections on the board

This allows the technician to view and edit the Tracer configuration and troubleshoot the unit. However, control options ordered and the wiring practice followed in the field may limit the communication ability.

Route interconnecting wiring from the Tracer service communication at the wall-mounted zone sensor module. Install wiring by referencing the unit wiring diagram and Table 3 on page 35 for appropriate wire sizes. After wiring is complete, connect the communication cable (provided with the Rover service tool) to the telephone style RJ11 connection on the zone sensor module. Attach the other end of the cable to a laptop computer running Trane Rover software to establish communication.

Establish service communication to the Tracer directly to the board inside the control box. Reference the unit-wiring diagram for the appropriate communication terminals on the board. Once wiring is complete, Use Trane Rover software to communicate to the Tracer

ZN.520.

ZN.520 using a twisted wire pair to one of

ZN.520

ZN.520 to provide

ZN.520 by wiring

60 UNT-IOM-6

Tracer® ZN.520

Tracer® ZN.520 Unit Start-Up

Refer to the Trane publication, CNT-IOP-2 Installation Operation and Programming Guide, to operate the Tracer® ZN.520 with Trane

Integrated Comfort System (ICS). The factory pre-programs the

Tracer airflow. Use Tracer Summit® building automation system or Rover software to change the default values.

Follow the procedure below to operate the Tracer® ZN.520 in a standalone operation:

1) Turn power on at the disconnect switch option.

2) Position the fan mode switch to either high, medium, low, or

3) Rotate the setpoint dial on the zone sensor module to 55 F

The appropriate control valve will actuate assuming the following conditions:

1) Room temperature should be greater than 55 deg. F and less

2) For a 2-pipe fan-coil unit with an automatic changeover

4) Select the correct temperature setpoint.

ZN.520 with default values to control the temperature and unit

the auto position.

for cooling or 85 F for heating.

than 85 deg. F

sensor, the water temperature input is appropriate for the demand placed on the unit.For example, cooling operation is requested and cold water (5 degrees lower than room tem perature) flows into the unit.

Note: Select and enable zone sensor temperature settings to prevent freeze damage to unit.

Tracer Communications

Tracer Sequence of Operation

UNT-IOM-6 61

ZN.520

Tracer address. Each individual board has its own unique Neuron I.D. number that takes the place of dip switches.

The Tracer

1) occupied

2) unoccupied

3) occupied standby

4) occupied bypass

5) Tracer Summit with supply fan control

ZN.520 is a Comm 5 controller. There is no need to set an

ZN.520 operates the fan in the following modes:

Tracer® ZN.520

Occupied

Unoccupied Mode

When the controller is in the occupied mode, the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint, based on the measured space temperature, the discharge air temperature, the active setpoint, and the proportional/ integral control algorithm. The modulating control algorithm used when occupied or in occupied standby is described in the following sections. Additional information related to the handling of the controller setpoints can be found in the previous Setpoint operation section.

When the controller is in the unoccupied mode, the controller attempts to maintain the space temperature at the stored unoccupied heating or cooling setpoint, based on the measured space temperature, the active setpoint and the control algorithm, regardless of the presence of a hardwired or communicated setpoint. Similar to other configuration properties of the controller, the locally stored unoccupied setpoints can be modified using Rover service tool. In unoccupied mode, a simplified zone control algorithm is run. During the cooling mode, when the space temperature is above the cool setpoint, the primary cooling capacity operates at 100%. If more capacity is needed, the supplementary cooling capacity turns on (or opens to 100%). During the heating mode, when the space temperature is below the heat setpoint, the primary heating capacity turns on. All capacity is turned off when the space temperature is between the unoccupied cooling and heating setpoints. Note that primary heating or cooling capacity is defined by unit type and whether heating or cooling is enabled or disabled. For example, if the economizer is enabled and possible, it will be the primary cooling capacity. If hydronic heating is possible, it will be the primary heating capacity.

Occupied Standby Mode

The controller can be placed into the occupied standby mode when a communicated occupancy request is combined with the local (hardwired) occupancy binary input signal. When the communicated occupancy request is unoccupied, the occupancy binary input (if present) does not affect the controllers occupancy. When the communicated occupancy request is occupied, the controller uses the local occupancy binary input to switch between the occupied and occupied standby modes.

During occupied standby mode, the controllers economizer damper position goes to the economizer standby minimum position. The economizer standby minimum position can be changed using Rover service tool.

In the occupied standby mode, the controller uses the occupied

62 UNT-IOM-6

Occupied Bypass Mode

Tracer® ZN.520

standby cooling and heating setpoints. Because the occupied standby setpoints typically cover a wider range than the occupied setpoints, the Tracer heating and cooling the space. Also, the outdoor air economizer damper uses the economizer standby minimum position to reduce the heating and cooling demands.

When no occupancy request is communicated, the occupancy binary input switches the controllers operating mode between occupied and unoccupied. When no communicated occupancy request exists, the unit cannot switch to occupied standby mode.

The controller can be placed in occupied bypass mode by either communicating an occupancy request of Bypass to the controller or by using the timed override On button on the Trane zone sensor. When the controller is in unoccupied mode, you can press the On button on the zone sensor to place the controller into occupied bypass mode for the duration of the bypass time (typically 120 minutes).

ZN.520 controller reduces the demand for

Occupancy Sources

There are four ways to control the controllers occupancy:  Communicated request (usually provided by the building automation system or peer device)  By pressing the zone sensors timed override On button  Occupancy binary input  Default operation of the controller (occupied mode)

A communicated request from a building automation system or another peer controller can change the controllers occupancy. However, if communication is lost, the controller reverts to the default operating mode (occupied) after 15 minutes (configurable, specified by the receive heartbeat time), if no local hardwired occupancy signal exists.

A communicated request can be provided to control the occupancy of the controller. Typically, the occupancy of the controller is determined by using time-of-day scheduling of the building automation system. The result of the time-of-day schedule can then be communicated to the unit controller.

For complete information about the setup for Tracer Summit

tions of this controller, see the Tracer Summit

product literature. For

applica-

more information on the setup of another building automation system,

UNT-IOM-6 63

Tracer® ZN.520

Tracer Summit® With Supply Fan Control

Cooling Operation

refer to the product-specific literature from that manufacturer. If the unit is communicating with Tracer Summit and the supply fan control programming point is configured for Tracer (the factory configures as local), then Tracer Summit will control the fan regardless of the fan mode switch position.

All Tracer

ZN.520 lockouts (latching diagnostics) are manually reset whenever the fan mode switch is set to the off position or when power is restored to the unit. The last diagnostic to occur is retained until the unit power is disconnected. Refer to Trane publication, CNT-IOP-2

Tracer specific instructions regarding the procedure for running the Tracer

ZN.520 Installation Operation and Programming Guide, for

ZN.520.

The heating and cooling setpoint high and low limits are always applied to the occupied and occupied standby setpoints.

During the cooling mode, the Tracer

ZN.520 controller attempts to maintain the space temperature at the active cooling setpoint. Based on the controllers occupancy mode, the active cooling setpoint is one of the following:  Occupied cooling setpoint  Occupied standby cooling setpoint  Unoccupied cooling setpoint

The controller uses the measured space temperature, the active cooling setpoint, and discharge air temperature along with the control algorithm to determine the requested cooling capacity of the unit (0100%). The outputs are controlled based on the unit configuration and the required cooling capacity. To maintain space temperature control,

the Tracer

ZN.520 cooling outputs (modulating hydronic valve, 2position hydronic valve, or outdoor air economizer damper) are controlled based on the cooling capacity output.

The cooling output is controlled based on the cooling capacity. At 0% capacity, all cooling capacities are off and the damper is at minimum position. Between 0 and 100% capacity, the cooling outputs are controlled according to modulating valve logic (modulating valves) or cycled on (2-position valves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100% capacity, the cooling valve or damper is fully open (modulating valves) or on continuously (and 2-position valves).

Unit diagnostics can affect fan operation, causing occupied and occupied standby fan operation to be defined as abnormal. Refer to the Troubleshooting section for more information about abnormal fan operation.

64 UNT-IOM-6

Tracer® ZN.520

The Tracer® ZN.520 controller operates the supply fan continuously when the controller is in the occupied and occupied standby modes, for either heating or cooling. The controller only cycles the fan off with heating and cooling capacity in the unoccupied mode.

The economizer is used for cooling purposes whenever the outdoor temperature is below the economizer enable setpoint and there is a need for cooling. The economizer is used first to meet the space demand, and other forms of cooling are used if the economizer cannot meet the demand alone. See modulating outdoor air damper operation for additional information.

Discharge Air Tempering

Heating Operation

Cascade cooling control initiates a discharge air tempering function if the discharge air temperature falls below the discharge air temperature control low limit, all cooling capacity is at minimum, and the discharge control loop determines a need to raise the discharge air temperature. The controller then provides heating capacity to raise the discharge air temperature to its low limit.

The discharge air tempering function enables when cold outdoor air is brought in through the outdoor air damper, causing the discharge air to fall below the discharge air temperature control low limit. The controller exits the discharge air tempering function when heat capacity has been at 0% for five minutes.

During heating mode, the Tracer maintain the space temperature at the active heating setpoint. Based on the occupancy mode of the controller, the active heating setpoint is one of the following:  Occupied heating  Occupied standby heating  Unoccupied heating

During dehumidification in the heating mode, the controller adjusts the heating setpoint up to the cooling setpoint. This reduces the relative humidity in the space with a minimum of energy usage. The controller uses the measured space temperature, the active heating setpoint, and discharge air temperature, along with the control algorithm, to determine the requested heating capacity of the unit (0-100%). The outputs are controlled based on the unit configuration and the required heating capacity.

ZN.520 controller attempts to

UNT-IOM-6 65

Tracer® ZN.520

Unit diagnostics can affect the Tracer® ZN.520 controller operation, causing unit operation to be defined as abnormal. Refer to the Troubleshooting section for more information about abnormal unit operation.

The heating output is controlled based on the heating capacity. At 0% capacity, the heating output is off continuously. Between 0 and 100% capacity, the heating output is controlled according to modulating valve logic (modulating valves) or cycled on (2-position valves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100% capacity, the heating valve is fully open (modulating valves) or on continuously (2-position valves).

The Tracer occupied and occupied standby modes, but cycle between high and off speeds with heating/cooling during the unoccupied mode. When in the occupied mode or occupied standby mode and the fan speed is set at the high, medium, or low position, the fan runs continuously at the selected speed. Refer to the Troubleshooting section for more information on abnormal fan operation.

ZN.520 fan output(s) normally run continuously during the

Fan Mode Operation

When the units supply fan is set to auto, the controllers configuration determines the fan speed when in the occupied mode or occupied standby mode. The fan runs continuously at the configured heating fan speed or cooling fan speed. For all fan speed selections except off, the fan cycles off during unoccupied mode.

The economizer outdoor air damper is never used as a source of heating. Instead, the economizer damper (when present) is only used for ventilation; therefore, the damper is at the occupied minimum position in the occupied mode. The damper control is primarily associated with occupied fan operation.

For multiple fan speed applications, the Tracer offers additional fan configuration flexibility. Separate default fan speeds for heating and cooling modes can be configured. The fan runs continuously for requested speeds (off, high, medium, or low). When the fan mode switch is in the Auto position or a hardwired fan mode input does not exist, the fan operates at the default configured speed. See Table 21 on page 67 for default fan configuration for heat and cool mode. During unoccupied mode, the fan cycles between high speed and off with heating and cooling fan modes. If the requested speed is off, the fan always remains off. During dehumidification, when the fan is on Auto, the fan speed can

ZN.520 controller

66 UNT-IOM-6

Tracer® ZN.520

switch depending on the error. Fan speed increases as the space temperature rises above the active cooling setpoint.

Table 21. Fan Configuration

Auto fan operation Fan speed default

Heating Continuous Off Low Medium High CoolingContinuous Off Low Medium High

Additional flexibility built into the controller allows you to enable or disable the local fan switch input. The fan mode request can be either hardwired or communicated to the controller. When both are present, the communicated request has priority over the hardwired input. See the following tables.

Table 22. Local fan switch disabled or not present

Communicated fan speed input Fan operation

Off Off Low Low Medium Medium High High Auto (or not present) Auto (fan runs at the default speed)

Table 23. Local fan switch enabled

Communicated Fan switch (local) Fan operation fan speed input

Off Ignored Off Low Ignored Low Medium Ignored Medium High Ignored High Auto Off Low Medium High Auto Off Low Medium High Auto (configured default, determined by heat/cool mode)

Table 24. Fan operation in heating and cooling modes

UNT-IOM-6 67

Continuous Fan Operation

Tracer® ZN.520

Heating Cooling

Fan mode Occ. Unocc. Occ. Unocc.

Off Off Off Off Off Low Low Off/High Low Off/High Medium Med Off/High Med Off/High High High Off/High High Off/High Auto (continuous) Default Off/High Default Off/High fan sp. fan sp.

During occupied and occupied standby modes, the fan normally is on. For multiple speed fan applications, the fan normally operates at the selected or default speed (off, high, medium, or low). When fan mode is auto, the fan operates at the default fan speed.

During unoccupied mode, the controller controls the fan off. While unoccupied, the controller heats and cools to maintain the unoccupied heating and cooling setpoints. In unoccupied mode, the fan is controlled on high speed only with heating or cooling.

Fan Cycling Operation

Fan Off Delay

The unit fan is always off during occupied, occupied standby, and unoccupied modes when the unit is off due to a diagnostic or when the unit is in the off mode due to the local zone sensor module, a communicated request, or the default fan speed (off).

If both a zone sensor module and communicated request exist, the communicated request has priority.

Tracer fan cycles between high speed and off in the unoccupied mode only. The controllers cascade control algorithm requires continuous fan operation in the occupied mode.

When a heating output is controlled off, the Tracer automatically holds the fan on for an additional 30 seconds. This 30second delay gives the fan time to blow off any residual heat from the heating source, such as a steam coil. When the unit is heating, the fan off delay is normally applied to control the fan; otherwise, the fan off delay does not apply.

ZN.520 does not support fan cycling in occupied mode. The

ZN.520 controller

68 UNT-IOM-6

Tracer® ZN.520

Fan Start on High Speed

Entering Water Temperature Sampling Function

On a transition from off to any other fan speed, the Tracer® ZN.520 controller automatically starts the fan on high speed and runs the fan at high speed for 0.5 seconds. This provides the ample torque required to start all fan motors from the off position.

Tracer hydronic main coil changeover units.Hydronic heating/cooling changeover operation requires central plant operation, and the unit controller must use an entering water temperature sensor to verify delivery of the desired water temperature from the central plant.

When three-way valves are ordered with a Tracer controller is factory-configured to disable the entering water temperature sampling function, and the entering water sensor is mounted in the proper location. Disabling entering water temperature sampling eliminates unnecessary water flow through the main coil when threeway valves are used.

The Tracer valve applications that does not require special unit considerations, such as those required by bleed lines. The controller includes an entering water temperature sampling function that periodically opens the two-way valve to allow temporary water flow, producing reliable entering water temperature measurement. . Only units using the main hydronic coil for both heating and cooling (2-pipe changeover and 4-pipe changeover units) use the entering water temperature sampling function. Two-pipe changeover and 4-pipe changeover applications allow the main coil to be used for heating and for cooling; therefore, these applications require an entering water temperature sensor.

ZN.520 can sample the entering water temperature for all

ZN.520 control, the

ZN.520 controller offers a control solution for two-way

Heating or Cooling Required

UNT-IOM-6 69

The entering water temperature value is useful to the unit controller only when heating or cooling is required. The entering water temperature must be five degrees above the space temperature for hydronic heating and five degrees below the space temperature for hydronic cooling. When water flows normally and frequently through the coil, the controller does not invoke the sampling function because the water temperature is satisfactory for the desired heating or cooling. The controller invokes entering water temperature sampling only when the measured entering water temperature is too cool to heat or too warm to cool. Entering water is cold enough to cool when it is five degrees below the measured space temperature. Entering water is

Tracer® ZN.520

warm enough to heat when it is five degrees above the measured space temperature.

When the controller invokes the entering water temperature sampling function, the unit opens the main hydronic valve for no more than three minutes before considering the measured entering water temperature. An initial stabilization period is allowed to flush the coil. This period is equal to 30 seconds plus ½ the valve stroke time. Once this temperature stabilization period has expired, the controller compares the entering water temperature against the effective space temperature (either hardwired or communicated) to determine whether the entering water can be used for the desired heating or cooling. If the water temperature is not usable for the desired mode, the controller continues to compare the entering water temperature against the effective space temperature for a maximum of three minutes.

The controller automatically disables the entering water temperature sampling and closes the main hydronic valve when the measured entering water exceeds the high entering water temperature limit (110 F). When the entering water temperature is warmer than 110 F, the controller assumes the entering water temperature is hot because it is unlikely the coil would drift to a high temperature unless the actual loop temperature was very high.

Electric Heat Operation

Fresh Air Damper Options

If the entering water temperature is unusable  too cool to heat or too warm to cool  the controller closes the hydronic valve and waits 60 minutes before initializing another sampling. If the controller determines the entering water temperature is valid for heating or cooling, it resumes normal heating/cooling control and effectively disables entering water temperature sampling until it is required.

The Tracer operation for heating. To control the space temperature, electric heat is cycled to control the discharge air temperature. The rate of cycling is dependent upon the load in the space and the temperature of the incoming fresh air from the economizer (if any).Two-pipe changeover units with electric heat use the electric heat only when hot water is not available.

Manual

Units with the manual fresh air damper option ship with the damper in the closed position, which is adjustable from zero to 100 percent in 25 percent increments. To adjust the position, first remove the air filter

ZN.520 controller supports 1- or 2-stage electric heat

70 UNT-IOM-6

Tracer® ZN.520

to expose the damper stop screw on the control panel end. Relocate the stop screw to the appropriate position. Then loosen the stop screw wingnut and adjust the linkage.

Economizer Damper

With a valid outdoor air temperature (either hardwired or communicated), Tracer the highest priority source of cooling. Economizer operation is only possible through the use of a modulating damper. Economizing is possible during the occupied, occupied standby, unoccupied, and occupied bypass modes.

The controller initiates the economizer function if the outdoor air temperature is cold enough to be used as free cooling capacity. If the outdoor air temperature is less than the economizer enable setpoint (absolute dry bulb), the controller modulates the outdoor air damper (between the active minimum damper position and 100%) to control the amount of outdoor air cooling capacity. When the outdoor air temperature rises 5 F above the economizer enable point, the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum damper position.

ZN.520 uses the modulating economizer damper as

Table 25. Relationship Between Outdoor Temperature Sensors and Damper Position

Outdoor Air Temp. Modulating Outdoor Air Damper

Occ. or Occ. standby Unocc. Occ. bypass

None or invalid Open to occ. Open to occ. Closed

min.pos. standby

min. pos.

Failed Open to occ. Open to occ. Closed

min.pos. standby

min. pos. Present and econ. Economizing: Economizing: Open and feasible min pos.-100% between occ. econ. only

standby min. when unit

pos.-100% operating,

closed otherwise

Present and econ. Open toocc. Open to occ. Closed not feasible min. pos. standby

min. pos.

UNT-IOM-6 71

Dehumidification

Tracer® ZN.520

Dehumidification is possible when mechanical cooling is available, the heating capacity is located in the reheat position, and the space relative humidity setpoint is valid.The controller starts dehumidifying the space when the space humidity exceeds the humidity setpoint. The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset.The controller uses the cooling and reheat capacities simultaneously to dehumidify the space. While dehumidifying, the discharge air temperature is controlled to maintain the space temperature at the current setpoint. A typical scenario involves high humidity and high temperature load of the space.The controller sets the cooling capacity to 100% and uses the reheat capacity to warm the discharge air to maintain space temperature control.Dehumidification may be disabled via Tracer or configuration.

Note: If the unit is in the unoccupied mode, the dehumidification routine will not operate.

Data Sharing

Binary Inputs

Because this controller utilizes LonWorks technology, the controller can send or receive data (setpoint, heat/cool mode, fan request, space temperature, etc.) to and from other controllers on the communication link, with or without the existence of a building automation system. This applies to applications where multiple unit controllers share a single space temperature sensor (for rooms with multiple units but only one zone sensor) for both standalone (with communication wiring between units) and building automation system applications. For this application you will need to use the Rover service tool. For more information on setup, refer to the Trane publication EMTX-

IOP-2.

The Tracer mally, these inputs are factory-configured for the following functions:  Binary input 1: Low temperature detection (freezestat)  Binary input 2: Condensate overflow  Binary input 3: Occupancy/ Generic  Binary input 4: Fan status

Note: The generic binary input can be used with a Tracer Summit building automation system only.

Each binary input default configuration (including normally open/ closed) is set at the factory.However, you can configure each of the four binary inputs as normally open or normally closed. The controller will be set properly for each factory-supplied binary input end-device. When no device is connected to the input, configure the controllers

ZN.520 controller has four available binary inputs. Nor-

72 UNT-IOM-6

Tracer® ZN.520

Table 26. Binary Input Configurations

Binary Controller operation Input Description Configuration Contact closed Contact open

BI 1 Low temperature Normally closed Normal Diagnostic

detection (Note 1) (note 5)

BI 2 Condensate overflow (Note 1) Normally closed Normal Diagnostic

(note 5)

BI 3 Occupancy Normally open Unoccupied Occupied

BI 3 Generic binary input Normally open Normal (Note 3) Normal

(Note 3)

BI 4 Fan status (Note 1) Normally open Normal Diagnostic

(Note 4)

Note 1: During low temperature, condensate overflow, and fan status diagnostics, the Tracer control disables all normal unit operation of the fan, valves, and damper. Note 2: The occupancy binary input is for standalone unit controllers as an occupied/unoccupied input. However, when the controller receives a communicated occupied/unoccupied request, the communicated request has priority over the hardwired input. Note 3: The generic binary input does not affect unit operation. A building automation system reads this input as a generic binary input Note 4: If the fan mode input is in the off position or the controller is in the unoccupied mode with the fan off, the fan status input will be open. A diagnostic will not be generated when the controller commands the fan off. A diagnostic will only be generated if the fan status input does not close after one minute from energizing a fan output or any time the input is open for one minute. The controller waits up to one minute after energizing a fan output to allow the differential pressure to build up across the fan. Note 5: The table below shows the controllers response to low temperature detection, condensate overflow, and fan status diagnostics.

input as not used.

ZN.520

BIP Description Fan Valve Electric heat Damper

BI 1 Low temperature detection Off Open Off Closed BI 2 Condensate overflow Off Closed Off Closed BI 4 Fan status Off Closed Off Closed

UNT-IOM-6 73

Binary Outputs

Tracer® ZN.520

Binary outputs are configured to support the following:  Three fan stages (when one or two fan stages are present, medium fan speed can be configured as exhaust fan)  One hydronic cooling stage  One hydronic heating stage (dehumidification requires this to be in the reheat position)  One DX cooling stage  One- or two-stage electric heat (dehumidification requires this to be in the reheat position)  Face and bypass damper  Modulating outdoor air damper  One baseboard heat stage

Table 27. Binary Output Configuration

Binary Output Configuration

J1-1 Fan high J1-2 Fan medium J1-3 Fan low J1-4 (Key) J1-5 Cool valve  open, or 2 position valve,

(Note 1) J1-6 Cool valve  close (Note 1) J1-9 Heat valve  open, or 2 position valve, or 1

Electric heat stage (Note 1)

J1-10 Heat valve  close or 2

Electric heat stage

(Note 1) J1-11 Fresh air damper - open J1-12 Fresh air damper - close TB4-1 Generic / Bbaseboard heat output TB4-2 24VAC

Note 1: For Tracer

ZN.520 units configured and applied as 2-pipe hydronic heat/cool changeover, terminals J1-5 and J1-6 are used to control the primary valve for both heating and cooling. For Tracer ZN.520 units configured and applied as 2-pipe hydronic heat/cool changeover with electric heat, terminals J1-5 and J1-6 are used to control the primary valve (for both cooling and heating), and terminals J1-9 and J1-10 are used only for the electric heat stage. For those 2pipe changeover units, electric heat will not be energized while the hydronic supply is hot (5 or more degrees above the space temperature).

74 UNT-IOM-6

Tracer® ZN.520

Analog Inputs

Table 28. Analog Inputs

Description Terminals Function Range

Zone TB3-1 Space temperature input 5° to 122°F (-15° to 50°C)

Ground TB3-2 Analog ground NA

Set TB3-3 Setpoint input 40° to 115°F (4.4° to 46.1°C)

Fan TB3-4 Fan switch input 4821 to 4919 W (Off)

2297 to 2342 W (Auto) 10593 to 10807 W (Low) 13177 to 13443 W (Medium) 15137 to 16463 W (High)

Ground TB3-6 Analog ground NA

Analog Input 1 J3-1 Entering water temperature -40° to 212°F (-40° to 100°C)

J3-2 Analog ground NA

Analog Input 2 J3-3 Discharge air temperature -40° to 212°F (-40° to 100°C)

J3-4 Analog ground NA

Analog Input 3 J3-5 Fresh air temp/Generic temp -40° to 212°F (-40° to 100°C)

J3-6 Analog ground NA

Analog Input 4 J3-7 Universal Input 0  100%

Generic 4-20ma 0  100% Humidity 0  2000ppm CO2

J3-8 Analog ground NA

Ground J3-9 Analog ground NA

Notes:

1) The zone sensor, entering water temperature sensor, discharge air sensor, and the outside air temperature sensor are 10KW thermistors.

2) Zone sensor: Wall mounted sensors include a thermistor soldered to the sensors circuit board. Unit mounted sensors include a return air sensor in the units return air stream.

3) Changeover units include an entering water temperature sensor.

UNT-IOM-6 75

Tracer® ZN.520

Zone Sensor

Space Temperature Measurement

External Setpoint Adjustment

The Tracer® ZN.520 controller accepts the following zone sensor module inputs:  Space temperature measurement (10kW thermistor)  Local setpoint (either internal or external on the zone sensor module)  Fan switch  Timed override (On) and Cancel timed override  Communication jack

Trane zone sensors use a 10kW thermistor to measure the space temperature. Typically, zone sensors are wall-mounted in the room and include a space temperature thermistor. As an option, the zone sensor can be unit-mounted with a separate space temperature thermistor located in the units return air stream. If both a hardwired and communicated space temperature value exist, the controller ignores the hardwired space temperature input and uses the communicated value.

Zone sensors with an external setpoint adjustment (1kW) provide the

Tracer

29.4 C). The external setpoint is exposed on the zone sensors front cover.

ZN.520 controller with a local setpoint (50 to 85 F or 10 to

When the hardwired setpoint adjustment is used to determine the setpoints, all unit setpoints are calculated based on the hardwired setpoint value, the configured setpoints, and the active mode of the controller. The hardwired setpoint is used with the controllers occupancy mode (occupied, occupied standby, or unoccupied), the heating or cooling mode, the temperature deadband values, and the heating and cooling setpoints (high and low limits) to determine the controllers active setpoint.

When a building automation system or other controller communicates a setpoint to the controller, the controller ignores the hardwired setpoint input and uses the communicated value. The exception is the unoccupied mode, when the controller always uses the stored default unoccupied setpoints. After the controller completes all setpoint calculations, based on the requested setpoint, the occupancy mode, the heating and cooling mode, and other factors, the calculated setpoint is validated against the following setpoint limits:  Heating setpoint high limit  Heating setpoint low limit  Cooling setpoint high limit  Cooling setpoint low limit

76 UNT-IOM-6

Tracer® ZN.520

These setpoint limits only apply to the occupied and occupied standby heating and cooling setpoints. These setpoint limits do not apply to the unoccupied heating and cooling setpoints stored in the controllers configuration.

When the controller is in unoccupied mode, it always uses the stored unoccupied heating and cooling setpoints.The unit can also be configured to enable or disable the local (hardwired) setpoint. This parameter provides additional flexibility to allow you to apply communicated, hardwired, or default setpoints without making physical changes to the unit.

Similar to hardwired setpoints, the effective setpoint value for a communicated setpoint is determined based on the stored default setpoints (which determines the occupied and occupied standby temperature deadbands) and the controllers occupancy mode.

Fan Switch

On/Cancel Buttons

The zone sensor fan switch provides the controller with an occupied (and occupied standby) fan request signal (Off, Low, Medium, High, Auto). If the fan control request is communicated to the controller, the controller ignores the hardwired fan switch input and uses the communicated value. The zone sensor fan switch input can be enabled or disabled through configuration using the Rover service tool. If the zone sensor switch is disabled, the controller resorts to its stored configuration default fan speeds for heating and cooling, unless the controller receives a communicated fan input.

When the fan switch is in the off position, the controller does not control any unit capacity. The unit remains powered and all outputs drive to the closed position.Upon a loss of signal on the fan speed input, the controller reports a diagnostic and reverts to using the default fan speed.

Momentarily pressing the on button during unoccupied mode places the controller in occupied bypass mode for 120 minutes. You can adjust the number of minutes in the unit controller configuration using Rover service tool. The controller remains in occupied bypass mode until the override time expires or until you press the Cancel button. Communication jack

Use the RJ-11 communication as the connection point from Rover service tool to the communication linkwhen the communication jack is wired to the communication link at the controller. By accessing the communication jack via Rover, you gain access to any controller on the link.

UNT-IOM-6 77

Tracer® ZN.520

Table 29. Zone sensor wiring connections

TB1 Description

1 Space temperature 2 Common 3 Setpoint 4 Fan mode 5 Communications 6 Communications

Communications

The Tracer protocol. Typically, a communication link is applied between unit controllers and a building automation system. Communication also is possible via Rover, Tranes service tool. Peer-to-peer communication across controllers is possible even when a building automation system is not present.You do not need to observe polarity for Comm5 communication links.

The controller provides six 0.25-inch quick-connect terminals for the Comm5 communication link connections, as follows:  Two terminals for communication to the board  Two terminals for communication from the board to the next unit (daisy chain)  Two terminals for a connection from the zone sensor back to the controller

ZN.520 controller communicates via Tranes Comm5

78 UNT-IOM-6

Tracer® ZN.520

Diagnostics

Table 30. Tracer® ZN.520 Diagnostics

Diagnostic Fan Other Outputs (Note 1)

Condensate overflow Off Valves Closed, Fresh air damper Closed, electric heat Off,

Baseboard heat Off

Low temperature detection Off Valves Open, Fresh air damper Closed, electric heat Off,

Baseboard heat Off

Low air flow - fan failure Off Valves Closed, Fresh air damper Closed, electric heat Off,

Baseboard heat Off

Space temperature failure Off Valves Closed, Fresh air damper Closed, electric heat Off,

Baseboard heat Off

Entering water temp failure On Valves Enabled (Note 2), Fresh air damper

Enabled (Note 2), electric heat Enabled (Note 2), Baseboard heat Off

Discharge air temp low limit Off Valves Open, Fresh air damper Closed, electric heat Off,

Baseboard heat Off

Discharge air temp failure Off Valves Closed, Fresh air damper Closed, electric heat Off,

Baseboard heat Off,

Fresh air temp failure On Valves Enabled, Fresh air damper Minimum position

heat Enabled, Baseboard heat Enabled

Relative humidity failure On Valves Enabled, Fresh air damper Enabled, electric heat