Trane PTEC-070 Operation & Maintenance Manual

Operation

Maintenance

Packaged Terminal Air

Conditioner

PTEC-M-1A

Models PTEC and PTHC Units

PTEC-070 PTHC-070 (7,000 Btuh)

PTEC-090 PTHC-090 (9,000 Btuh)

PTEC-120 PTHC-120 (12,000 Btuh)

PTEC-150 PTHC-150 (15,000 Btuh)

Cooling/Electric Heat and Heat Pump Models with Standard or Remote

Controls

Warnings and

Cautions

NOTICE

Warnings and Cautions appear at appropriate sections throughout this manual.

Read these carefully.

WARNING - Indicates a potentially hazardous situation which, if not avoided, could result in death

or serious injury.

CAUTION - Indicates a potentially hazardous situation which, if not avoided, may result in minor

or moderate injury. It may also be used to alert against unsafe practices.

CAUTION - Indicates a situation that may result in equipment or property-damage-only accidents.

3

Contents

PTEC-M-1A

General Information

Performance Data

Chassis Information

Maintenance

Refrigeration System

Component Tests

Control Board Characteristics and Diagnostics

Disassembly

Diagnostic Charts

Schematic Diagrams

4

9

12

20

22

33

37

41

48

53

PTEC-M-1A

4

General

Information

Literature Change History

PTEC-M-1 (September 1997)

Original issue of manual; specifically

intended for use by experienced

service technicians. Provides

operation and maintenance

procedures for PTEC and PTHC units

of “ C” and later designs. Unit

specifications, performance data and

typical wiring diagram(s) are also

included. (RS4200002 397)

Environmental Accountability

Policy

Trane urges that all HVAC servicers working

on Company equipment or any

manufacturer’s products, make every effort to

eliminate, if possible, or vigorously reduce

the emission of CFC, HCFC and HFC

refrigerants to the atmosphere resulting from

installation, operation, routine maintenance,

or major service on this equipment. Always

act in a responsible manner to conserve

refrigerants for continued usage even when

acceptable alternatives are available.

Recover and Recycle Refrigerants

Refrigerant used in centrifugal water chillers

should be recovered and/or recycled for

reuse, reprocessed (reclaimed), or properly

disposed of, whenever it is removed from the

equipment . Never release to atmosphere!

Always determine recycle or reclaim

requirements of the refrigerant before

beginning recovery procedure. Obtain a

chemical analysis of the refrigerant if

necessary. (Questions about recovered

refrigerant and acceptable refrigerant quality

standards are addressed in ARI Standard

700).

Refrigerant Handling and Safety

Consult manufacturer’s Material Safety Data

Sheets (MSDS) on refrigerants being handled

to understand health, safety, storage,

handling and disposal requirements. Use

approved containment vessels and refer to

appropriate safety standards. Comply with all

applicable transportation standards when

shipping refrigerant containers.

Service Equipment and Procedures

To minimize refrigerant emissions while

recovering the refrigerant , use recycling

equipment such as a Company recycle/

recovery system or equivalent. Use

equipment and methods which will pull the

lowest possible system vacuum while

recovering and condensing refrigerant.

Equipment capable of pulling a vacuum of

less than 1,000 microns (1.0 mm) of mercury

is recommended. Do not open the unit to

atmosphere for service work until the

refrigerant charge is fully removed/recovered.

When leak-testing with trace refrigerant and

nitrogen, use HCFC-22 (R-22) rather than CFC-

12 (R-12) or any other fully-halogenated

refrigerant . Be aware of any new leak test

methods which may eliminate refrigerants as

a trace gas. Evacuation prior to charging

should be done with a vacuum pump capable

of pulling a vacuum of 1,000 microns (1.0

mm) of mercury or less. The unit should

stand for 12 hours and the vacuum should

not rise above 2,500 microns (2.6 mm) of

mercury. A rise above 2,500 microns (2.5 mm)

of mercury indicates a leak test is required to

locate and repair any leaks. A leak test will be

required on any repaired area. Charge

refrigerant into the machine only when it is

determined that the machine does not leak or

contain moisture. Charge refrigerant into the

machine by weight. A proper charge is

required for efficient machine operation.

When charging is complete, purge or drain

charging lines into an approved refrigerant

container. Seal all used refrigerant containers

with approved closure devices to prevent

unused refrigerant from escaping to the

atmosphere. Take extra care to properly

maintain all service equipment directly

supporting refrigerant service work such as

gauges, hoses, vacuum pumps, and recycling

equipment . When cleaning system

components or parts, avoid using CFC-11 (R-

11) or CFC-113 (R-113). Use only

cleaning-solvents that do not have ozone

depletion factors. Properly dispose of used

materials. Refrigeration system cleanup

methods using filters and driers are preferred.

Maintain the purge unit on centrifugal water

chillers in proper working condition. An

improperly maintained purge unit can cause

significant refrigerant emissions to the

atmosphere. Consider replacing older

operational purge units with the new

Company Purifier Purge unit. Excessive purge

operation is an indication of possible

refrigerant leakage. Check for leaks when

excessive purge operation is observed.

Future Developments

Keep abreast of unit enhancements,

conversion refrigerants, compatible parts,

and manufacturer’s recommendations which

will reduce refrigerant emissions and increase

equipment operating efficiencies. Follow

specific manufacturer’s guidelines for

conversion of existing equipment . Use only

Company approved gaskets, O-rings, oil

filters, and other components on centrifugal

water chillers or CenTraVacs. In order to assist

in reducing power generation requirements,

always attempt to improve chiller equipment

performance with improved maintenance

operations which will help conserve energy

resources. Items to be considered include

tube cleanliness, proper water flows, correct

refrigerant charge, cooling tower

maintenance, and proper operation of

controls and features such as free cooling,

chilled water reset functions, and time of day

scheduling.

PTEC-M-1A (July 2002)

Product update. New control board

features.

5

PTEC-M-1A

General

Information

Model Number

All standard products are identified

by multiple-character model

numbers that precisely identifies a

particular type of unit. An

explanation of the alphanumeric

identification code used with

Packaged Terminal Air Conditioners

is provided below.

Use of the service model number

will enable the owner/operator,

installing contractors, and service

technicians to define the operation,

components and options of a

particular PTEC or PTHC unit.

Important! Be sure to refer to the

model number stamped on the unit

nameplate when ordering

replacement parts or requesting

service.

All product model and serial

nameplates carry an additional

number called the manufacturing

number. It is possible to have one or

more like products with the same

model number, but that a portion of

the parts would not be

interchangeable.

The manufacturing number has

been added to the product to assist

the service department in identifying

any given product. It is extremely

important when looking up service

repair parts in the parts list, or when

requesting service information, that

the manufacturing, model and serial

numbers be used to properly identify

the product.

Chassis Model Number

Breakdown

P T E C 090 1 G * C

1 2 3 4 567 8 9 10 11

Digits 1,2

Packaged Terminal Air Conditioner

Digit 3

Unit Type

E = Air Conditioner

H = Heat Pump

Digit 4

Development Sequence

C = Third Development

Digits 5,6,7

Unit Cooling Capacity

070 = 7,000 Btuh

090 = 9,000 Btuh

120 = 12,000 Btuh

150 = 15,000 Btuh

Digit 8

Main Power Supply

1 = 230-208/60/1

2 = 265/60/1

Digit 9

Electric Heating Capacity

O = None

C = 1.5 kW

E = 2.5 kW

G = 3.5/3.7 kW

J = 5.0 kW

Digit 10

Design Sequence

*C Design Sequence for 7, 9, 12K Btu

D Design Sequence for 15K Btu

Digit 11

Miscellaneous

A = Standard

B = PowerVent

C = Corrosion-Resistant Unit

D = Condensate Disposal Pump

F = Hydronic w/Power Vent and Door

G = Hydronic w/Power Door

H = Hydronic w/Manual Door

J = Power Door

K = Cond. Pump and Power Vent

L = Cond. Pump and Power Door

PTEC-M-1A

6

General

Information

Important Information

Pride and workmanship go into

every product to provide our

customers with quality products. It is

possible, however, that during its

lifetime a product may require

service. Products should be serviced

only by a qualified service technician

who is familiar with the safety

procedures required in the repair

and who is equipped with the proper

tools, parts, testing instruments and

the appropriate service manual.

7

PTEC-M-1A

General

Information

Unit Features

This unit has many features which

are different than those found on

conventional PTAC units. The

servicer must be familiar with these

features in order to properly service

the unit.

• Automatic 3-minute compressor

lockout - After the compressor

cycles off, it will not restart for three

minutes.

• Automatic 2nd stage electric heat -

If the room temperature falls to

4.0°F below the set point

temperature, the reverse cycle heat

is shut off and the electric heat is

turned on.

• Automatic freeze protection -

Whenever power is supplied to the

unit, automatic freeze protection is

active. If the unit senses room

temperature below 40°F, the fan

motor and electric heat are turned

on.

• Random restart delay -To help

eliminate power surges after a

power outage, the unit is equipped

with a two to four minute random

restart delay feature. Whenever the

unit is plugged in with the master

switch turned on and the mode

switch set in the cool or heat mode,

a random restart will occur. A

random restart condition can be

avoided by setting the mode

switch in the fan only or off

position before applying power to

the unit.

• Fuse Holder - On all 265 volt units,

fuse holders are factory installed.

Check for blown fuse if unit does

not operate. The fuse holder is

located behind the front cabinet

under the control board.

Replacement fuses may be

purchased from your local TPC.

• Front Mounting Holes -Two

mounting holes are provided to

give the owner the option of

securing the front to the chassis.

The mounting holes are located

behind the intake grille. The owner

must supply two 1/2 inch long #8

sheet metal screws per unit . The

two screws must be removed

before the front can be removed.

PTEC-M-1A

8

Unit Accessories

This unit is designed for through-

the-wall installation in new or

existing buildings. To complete the

installation of this PTAC, an

insulated wall sleeve and an outdoor

grille (either the stamped aluminum

grille or the architectural grille) are

required.

The chassis and the cabinet front are

shipped in one carton. Optional

accessories to complete a particular

installation are shown in Table 1.

Note: Consult sales literature for the

appropriate voltage and amperage

selections, if applicable. For

additional details and illustrations of

the accessories, refer to the catalog

or the particular installation manual.

General

Information

Table 1

Accessory

Wall Sleeve Kit Main Duct Kit

Heater Kit Subbase Kit

Architectural Grille Kit Extension Duct Kit

Hydronic Heat Kit Leveling Legs Kit

Stamped Grille Kit Wall Thermostat Kit

Power Vent Kit Hard Wire Kit

Deflector Grille Kit Drain Kit

Fuse Holder Kit Key Lock Kit

Power Switch Kit Filter Kit

Circuit Breaker Kit Remote Escutcheon Kit

Condensate Disposal Pump Kit Remote Temperature Sensor Kit

Water or Steam Valve Kit

9

PTEC-M-1A

Performance

Data

Table PD-1 — Cooling Performance — Air Conditioner with Electric Heat Models

Model Type Air Conditioner

Model No.

1 & 5

PTEC 07 PTEC 09 PTEC 12 PTEC 15

Voltage

3

208 230 265 208 230 265 208 230 265 208 230 265

Capacity (Btu)

6

7000 7100 7100 8900 9100 9100 11900 12000 12000 14000 14200 14200

Amps 3.0 2.8 2.3 3.8 3.7 3.0 5.0 4.1 4.3 6.3 6.3 5.9

Watts 600 610 610 785 805 805 1110 1120 1130 1480 1500 1500

EER 11.6 11.6 11.6 11.3 11.3 11.3 10.7 10.7 10.7 9.5 9.5 9.5

Unit without Electric Heater

Min. Circuit/Ampacity

2 & 4

4.0 4.0 3.6 5.1 5.1 4.4 6.4 6.4 5.7 8.8 8.8 7.7

cfm (cool, wet coil)

High 240 245 245 240 245 245 315 325 325 315 325 325

Low 205 220 220 205 220 220 229 250 250 220 250 250

cfm (dry coil)

High 260 265 265 260 265 265 335 345 345 335 345 345

Low 215 230 230 215 230 230 235 265 265 235 265 265

Ventilated Air, cfm (fan only) 65* 65* 65* 65* 65* 65* 70* 70* 70* 70** 70** 70**

Dehumidification (pints/hr.) 1.6 1.6 1.6 2.6 2.6 2.6 3.5 3.5 3.5 4.4 4.4 4.4

Net wt. (approximate lbs.) 90 90 90 95 95 95 105 105 105 110 110 110

Shipping wt. (approximate lbs.) 105 105 105 110 110 110 120 120 120 125 125 125

*Approximately 70 cfm with optional vent kit. Actual vent cfm performance will vary due to application and installation conditions.

**Approximately 95 cfm with optional power vent kit. Actual vent cfm performance will vary due to application and installation conditions.

Table PD-2 — Cooling Performance —Heat Pump with Electric Heat Models

Model Type Heat Pumps

Model No.

1 & 5

PTHC 07 PTHC 09 PTHC 12 PTHC 15

Voltage

3

208 230 265 208 230 265 208 230 265 208 230 265

Capacity(Btu)

6

7000 7100 7100 8800 9000 9000 11800 12000 12000 13800 14000 14000

Amps 3.0 2.8 2.3 3.8 3.5 3.0 5.0 4.6 4.3 6.9 6.3 5.9

Watts 610 615 615 785 805 805 1110 1120 1120 1485 1505 1505

EER 11.5 11.5 11.5 11.2 11.2 11.2 10.7 10.7 10.7 9.3 9.3 9.3

Unit without Electric Heater

Min Circuit/Ampacity

2 & 4

4.0 4.0 3.6 5.1 5.1 4.4 6.4 6.4 5.7 8.8 8.8 7.7

cfm (cool, wet coil)

High 240 245 245 240 245 245 315 325 325 315 325 325

Low 205 220 220 205 220 220 229 250 250 220 250 250

cfm (dry coil)

High 260 265 265 260 265 265 335 345 345 335 345 345

Low 215 230 230 215 230 230 235 265 265 235 265 265

Ventilated Air, cfm (fan only) 65* 65* 65* 65* 65* 65* 70* 70* 70* 70** 70** 70**

Dehumidification (pints/hr.) 1.6 1.6 1.6 2.6 2.6 2.6 3.5 3.5 3.5 4.4 4.4 4.4

Net wt. (approximate lbs.) 95 95 95 100 100 100 110 110 110 115 115 115

Shipping wt. (approximate lbs.) 110 110 110 115 115 115 125 125 125 130 130 130

*Approximately 70 cfm with optional vent kit. Actual vent cfm performance will vary due to application and installation conditions.

**Approximately 95 cfm with optional power vent kit. Actual vent cfm performance will vary due to application and installation conditions.

Notes:

1. All 265 volt models must use Trane’s subbase or Trane’s hard-wire junction box kit.

2. Minimum branch circuit ampacity ratings conform to the National Electric Code. However, local codes should apply.

3. Minimum voltage on 208/230 volt models is 197 volts; maximum is 253 volts. Minimum voltage on 265 volt models is 238.5 volts; maximum is 291.5 volts.

4. Overcurrent protection for all units without electric heaters is 15 amps. Overcurrent protection on 265 volt models must be cartridge-style time delay fuses (included and factory

installed on Trane chassis). Note: All heat pump units must have electric coils.

5. Minimum operating ambient = 45°F.

6. Certified in accordance with the Unitary Air-Conditioner Equipment certification program, which is based on ARI standard 310/380.

EER — Energy Efficiency Ratio per American Refrigeration Institute (ARI) Test Procedures.

COP — Coefficient of Performance per ARI Test Procedures.

PTEC-M-1A

10

Table PD-3 — Heat Pump Reverse Cycle Heating Capacity (Btu)

Model No.

1

PTHC 07 PTHC 09 PTHC 12 PTHC 15

Voltage

3

208 230 265 208 230 265 208 230 265 208 230 265

Amps 3.0 2.6 2.2 3.6 3.2 2.6 5.1 4.5 3.9 6.3 5.7 5.4

Watts 550 570 570 730 740 740 1000 1020 1020 1355 1365 1365

Btuh

2

6200 6400 6400 8000 8100 8100 10600 10800 10800 13200 13300 13300

COP

2

3.3 3.3 3.3 3.2 3.2 3.2 3.1 3.1 3.1 2.9 2.9 2.9

CFM (Dry) 230 235 235 230 235 230 290 310 310 335 345 345

Heating

2

Btuh °F

Outdoor Ambient 62 7200 7400 7400 9600 9700 9700 12800 13000 13000 15700 15800 15800

57 6900 7100 7100 9100 9200 9200 12100 12300 12300 14900 15000 15000

52 6500 6700 6700 8500 8600 8600 11400 11600 11600 14100 14200 14200

Rating Point

2

47 6200 6400 6400 8000 8100 8100 10600 10800 10800 13200 13300 13300

42 5900 6100 6100 7500 7600 7600 9900 10100 10100 12400 12500 12500

37 5600 5800 5800 7000 7100 7100 9200 9400 9400 11600 11700 11700

32 5300 5500 5500 6500 6600 6600 8400 8600 8600 10700 10800 10800

27 5000 5200 5200 6000 6100 6100 7700 7900 7900 9900 10000 10000

24 4800 5000 5000 5700 5800 5800 7300 7500 7500 9400 9500 9500

Watts 62 585 600 600 790 800 800 1100 1120 1120 1455 1465 1465

Outdoor Ambient 57 580 595 595 780 790 790 1075 1090 1090 1430 1440 1440

52 560 575 575 755 765 765 1045 1060 1060 1395 1405 1405

Rating Point 47 555 570 570 730 740 740 1005 1020 1020 1355 1365 1365

42 535 560 560 710 720 720 970 985 985 1315 1325 1325

37 530 545 545 685 695 695 935 950 950 1275 1285 1285

32 520 535 535 670 680 680 885 900 900 1230 1240 1240

27 510 525 525 640 650 650 840 855 855 1180 1190 1190

24 505 520 520 620 630 630 815 830 830 1170 1180 1180

Notes:

1. All 265 volt models must use Trane’s subbase or Trane’s hard-wire junction box kit.

2. Heating capacity and efficiency is based on unit operation without condensate pump. Unit automatically switches to electric heat at 25°F outdoor coil temperature. Depending upon

relative humidity conditions, this will occur at approximately 35°F outdoor ambient temperature.

Performance

Data

11

PTEC-M-1A

Table PD-4 — Electric Heat Capacity and Electrical Data (For PTEC and PTHC Models)***

Electric Nominal Heating Minimum Circuit Overcurrent

Heater No. Of Total Total Power

Voltage

2

Size (kW) Stages Btu 208 Btu 230 Btu 265 Watts

4

Amps Ampacity

1

Protection

3

Cord

208/230 2.0/2.5 1 6,800 8,500 — 2,080/2,580 10.2/11.5 14.2 15 6-15 P

208/230 2.9/3.5 1 9,900 12,000 — 2,980/3,580 14.5/15.8 19.6 20 6-20 P

208/230 4.1/5.0 ** 14,000 17,100 — 4,180/5,080 20.3/22.3 27.8 30 6-30 P

265 2.5 1 ——8,500 2,580 9.9 12.3 15 7-20 P

265 3.7 1 ——12,600 3,780 14.5 18.0 20 7-20 P

265 5.0 ** ——17,100 5,080 19.4 24.1 25 7-30 P

Notes:

1. Minimum branch circuit ampacity ratings conform to the National Electric Code. However, local codes should apply.

2. Minimum voltage on 208/230 volt models is 197 volts; maximum is 253 volts. Minimum voltage on 265 volt models is 238.5 volts; maximum is 291.5 volts.

3. Overcurrent protection for all units without electric heaters is 15 amps. Overcurrent protection on 265 volt models must be cartridge-style time delay fuses (included and factory

installed on Trane chassis).

4. Total watts for 7,000 and 9,000 Btu models; add 70 watts for size 12 and for size 15.

**PTEC/PTHC09 and 12 are two-stage; PTEC/PTHC15 is one-stage.

*** Note: All heat pumps must have electric coils.

Table PD-5 — Power Receptacle Configurations

Voltage 208/230 265

Unit Supplied Plug

Amps 15 20 30 20 30

NEMA Rating 6-15P 6-20P 6-30P 7-20P 7-30P

Receptacle

Amps 20 20 30 20 30

NEMA Rating 6-20R 6-20R 6-30R 7-20R 7-30R

Notes:

1. All wiring, including receptacles, must be made in accordance with local electrical codes and regulations.

2. NEMA 6-15 and 6-20 plugs fit in NEMA 6-20 receptacles.

3. Receptacles shown for 208/230 applications are factory supplied with subbase, per local codes for wall mounted receptacles use or the corresponding NEMA receptacles.

4. Receptacles shown for 265 volt applications are factory supplied with subbase. Codes do not allow 265 volt units to mate with wall mounted receptacles. They may however be

hard-wired per Local Codes.

Performance

Data

PTEC-M-1A

12

Chassis

Information

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

Operating Instructions

Users Controls

Two rotary knobs controlling

temperature and operational mode

are located behind the control door

located to the top-right of the cabinet

front.

Thermostat Setting

Turning the thermostat control

clockwise will provide a cooler room

temperature; turning it

counterclockwise will provide a

warmer room temperature.

Adjusting the thermostat to the mid

setting (vertical) will set the room

temperature at approximately 75°F.

Mode Switch

The table below describes the unit

function corresponding to the

various mode switch settings.

Additional Control Inputs

The control inputs shown below

provide additional unit control and

features. To access these control in

puts, the cabinet front must be

removed (see Front Removal).

Furthermore, to access the remote

control, front desk control, and

remote temperature sensor input

connections, the terminal strip cover

must be removed as shown.

Control Board User Inputs

13

PTEC-M-1A

Chassis

Information

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

Master Switch

The master switch disconnects

power to all of the system

components. When this switch is in

the off position, the compressor, fan

motor, reversing valve, and electric

resistance heater will all be de-

energized.

Remote/ Standard Switch

The remote/standard switch is used

to change the control of the unit

from the standard on board controls

in the standard mode, to a remote

wall mounted thermostat in the

remote mode. For remote

thermostat operation refer to

Remote Operation section.

Fan Cycle Switch

The fan cycle switch sets the

operational mode of the fan. In the

ON position, the fan will run

continuously whenever the unit is in

the heat or cool mode. In the AUTO

position, the fan will cycle on and off

with the compressor or electric

heater when the unit is in the cool or

heat mode.

Remote Control Inputs

The C, R, GH, GL, W2, Y/W1 and B

terminals provide control inputs for a

remote wall mounted thermostat.

For remote control operation refer to

Remote Thermostat Operation

section.

Front Desk Control

The FD1 and FD2 terminals provide

control inputs for a front desk switch.

Shorting across these two terminals

will disable unit operation. The only

control function which will remain

active when these terminals are

shorted is freeze protection. Any

switch which will produce a short

circuit across these two terminals

can be used as a front desk switch.

The contact resistance of the switch,

when closed, must be less than 200

ohms for the front desk feature to

operate properly.

The following table shows the

maximum wire length and

corresponding gauge size for

installation of a front desk switch.

Maximum Wire Length

For Front Desk Switch

Wire Size Maximum Length

(AWG) Allowed

#24 400 ft

#22 600 ft

#20 900 ft

#18 1500 ft

#16 2000 ft

The figure below shows a wiring

schematic for connecting the front

desk switch to the unit.

Front Desk Switch Wiring Schematic

IMPORTANT NOTE: Do not apply 24VAC across these terminals. Applying

24VAC to these terminals will result in failure of the control board. Shorting

these terminals to any other terminals may also result in control board failure.

PTEC-M-1A

14

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

Temperature Limiter

The temperature limiting feature can

reduce energy costs by controlling

the maximum temperature available

in heating and the minimum

temperature available in cooling.

Temperature Limiting

The temperature limits are set by

configuring the DIP switch bank at

the lower right hand corner of the

control board to the proper settings.

These settings will depend on the

owner preference. Below is a table

showing the DIP switch settings and

their respective temperature limits.

To expose the DIP switch bank,

remove the front cabinet (see

Disassembly Instructions) and locate

the control board. The DIP switch

bank should be visible along with

the remote thermostat terminals

without having to remove anything

else.

Chassis

Information

Temperature Limit Switch Allocations

Cool Heat

Position (°F) (°C)

A 70-78 65-73

B 68-81 68-76

C 66-83 61-78

D 63-88 58-83

15

PTEC-M-1A

VENT CONTROL (Units Without

Power Vent or Power Door Kits

Installed)

The vent control allows fresh air to

be drawn into the conditioned area.

This fresh air can provide ventilation

when the blower is operating, but it

will increase the heating or cooling

load and operating costs.

To obtain access to the vent control,

remove the cabinet front (see

Disassembly Procedures) and locate

the vent control lever on the left side

of the chassis.

Rotate the vent control lever to either

open or close the damper.

Hydronic Heat Installations

To avoid the risk of freezing the

steam or water coil during

prolonged shutdown periods, the

vent door must be left closed when

the outdoor temperature might fall

below freezing or a power door kit

must be installed.

Air Discharge Grille

The discharge grille can be adjusted

to expel air at either a 15° or 40°

angle.

Vent Door Level Positions Discharge Grille Orientation Options

Chassis

Information

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

PTEC-M-1A

16

Chassis

Information

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

Use the following procedure to

change the angle of the discharge air

flow:

1. Remove the front cabinet (see

Front Removal).

2. Position the front so that the

backside is accessible.

3. Remove the four nuts which

secure the discharge air grille to

the cabinet front.

4. Rotate the grille 180° end-for-end.

5. Reinstall the nuts securing the

discharge air grille to the cabinet

front. Reinstall the cabinet front on

the unit.

Remote Thermostat Operation

To operate this unit with a remote

thermostat , the Standard/ Remote

switch shown below must be set to

the remote position. When in the

remote mode, the unit will only

respond to the thermostat inputs

(terminal strip positions GH, W2, Y/

W1 and B shown). The mode switch

and thermostat used for standard

operation will be automatically

overridden.

Notes:

1. In the remote mode, the 3-minute

compressor time delay, the

random restart feature and the

freeze protection feature are all

active. (See unit features.)

Control Board User Inputs

17

PTEC-M-1A

Chassis

Information

WARNING!

To avoid possible electrical shock,

personal injury or death, disconnect

the power before servicing.

Thermostat Location

This unit is designed to be operated

with a limited variety of remote wall

mounted Thermostats. For further

information on thermostats

approved for use with this unit,

contact your sales representative.

For best performance results, the

thermostat should be located

approximately five feet above the

floor on a vibration free, inside wall

in an area with good air circulation.

Do not

install the thermostat where

it may be affected by the following:

• Dead spots behind doors, in

corners or under cabinets

• Hot or cold drafts from air ducts

• Radiant heat from the sun,

appliances, or fireplaces

• Concealed pipes and chimneys.

Unheated (uncooled) areas behind

the thermostat , such as outside

walls

Consult the instruction sheet

packaged with the thermostat for

further details on mounting and

operation.

Remote Thermostat Operation

Approved thermostats vary slightly

in construction and, with few

exceptions, are operated similarly.

The following operational

description pertains to all of the non-

progammable approved

thermostats.

Please contact:

Trane Technical Service at

502-261-1260 for a list of approved

thermostats.

PTEC-M-1A

18

Chassis

Information

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

Wiring Schematic for

Remote Heat Pump

Wiring Schematic for

Straight Cool Unit

HEAT/ OFF/ COOL Switch

• OFF - cooling and heating functions

are defeated.

• HEAT - the selected room

temperature is maintained by

cycling either in the heat pump

mode or electric strip heat. A PTHC

unit is switched from the heat

pump mode to electric heat when

the outdoor coil temperature is

below 25°F (approximately), or

when the heat pump cannot keep

up with the heating load and a two

stage thermostat is used.

• COOL - the selected room

temperature is maintained by

cycling the air conditioner.

Fan Switch

• AUTO - the fan cycles with the

compressor or electric strip heat.

• ON - the fan runs continuously

regardless of any other settings.

The table below summarizes the

thermostat input combinations and

the respective unit functions.

The following figures show wiring

schematics for heat pump and

straight cool units with electric

resistance heat, respectively. Remote

hydronic heat installations should be

wired similar as for a straight cooling

unit.

Note: A heat pump thermostat (no

W1 terminal) can be used for a

straight cooling units. Connect

thermostat to unit according to the

schematic for remote heat pumps.

1. For heat pump operation, a room

thermostat with a “B” (heating

changeover) terminal is required.

This will mean that some “auto

changeover” thermostats cannot

be used, as many of them either

do not have a “B” terminal, or

else energize the “B” terminal

continuously when in the “ auto”

position.

2. The maximum power

consumption of any thermostat is

1.2 watts.

Unit Pump Electric Heat

Unit Thermostat Thermostat

Function Input Input

R Terminal to: R Terminal to:

OFF NONE NONE

Heat Stage 1 GL*, Y/W1, B

Gl*, Y/W1, B or

GL*, W2

Stage 2 GL*, W2 n/a

Cool GL*, Y/W GL*, Y/W1

*or GH depending on speed required.

19

PTEC-M-1A

Chassis

Information

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

The following table shows the

maximum wire length and

corresponding gage size for

installation of a remote thermostat .

Maximum Wire Length

For Front Desk Switch

Wire Size Maximum Length

(AWG) Allowed

#24 400 ft

#22 600 ft

#20 900 ft

#18 1500 ft

#16 2000 ft

Remote Temperature Sensing

With control functions remaining at

the unit, the remote temperature

sensing feature is a unique

accessory capable of providing

accurate sensing of room

temperature from a central location,

separate from the unit.

NOTE: Freeze protection

temperatures will be sensed by the

Remote Temperature Sensor and not

at the PTAC unit.

The remote temperature sensor is

connected to the unit using two low

voltage wires as shown. Refer to the

Installation Instructions supplied

with the Remote Temperature

Sensor kit f or further information.

The Remote/Standard Thermostat

Control switch must be in the

STANDARD position when using the

Remote Temperature Sensor kit.

Remote Temperature Sensor

PTEC-M-1A

20

Maintenance

WARNING!

Hazardous Voltage!

Disconnect all electric power,

including remote disconnects before

servicing. Follow proper lockout/

tagout procedures to ensure the

power can not be inadvertently

energized. Failure to disconnect

power before servicing could result

in death or serious injury.

Chassis

The chassis must be cleaned every

six months or more often as the

atmospheric conditions require. Use

pressure water and detergent to

clean the basepan, center partition

and coils. The use of harsh cleaning

materials may cause a deterioration

of the coil fins or endplates.

Compressor / Fan Motor

The compressor and fan motor are

hermetically sealed, permanently

lubricated and require no additional

oiling.

Cabinet Front

The cabinet front and discharge air

grille can be cleaned with a mild

soap or detergent. Under no

circumstances should hydrocarbon

based cleaners (e.g. acetone,

benzene, naphtha gasoline, etc.) be

used to clean the front or outdoor air

grilles. Use care when cleaning the

control area. Do not use an

excessively wet cleaning cloth.

Intake Air Filter

The intake air filter and vent door

filter are both constructed of durable

polypropylene. The air intake air

filter is snapped into the cabinet

front, and the intake air grille swings

out for easy access to the filter.

Before cleaning the intake filter, turn

the unit off by setting the mode

switch to the OFF position. Filter

should be cleaned as required.

The following procedure is used to

remove the intake filter:

1. Open the intake grille by grasping

the top intake louver.

Opening Intake Grille

2. Pull the intake grille open.

Intake Grille Open

3. Press down lightly on the thumb

tab at the top of the filter and

remove the filter.

Filter Removal

4. Clean filter with vacuum or with

running water.

Reverse this procedure to reinstall

the filter.

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