Friedrich 920-087-09 (12-10) User Manual

5.31 Mb

Instant Heat

Heat pump models will automatically run the electric heater to quickly bring the room up to temperature when initially

energized, then return to heat pump mode. This ensures that the room is brought up to temperature quickly without the

Heat Pump Mode

usual delay associated with heat pump units.




Even Heat

The digital control monitors indoor conditions to ensure that the room temperature is within five degrees of the setpoint.

If necessary the unit will cycle the electric heat to maintain the temperature. This feature ensures guest comfort by


delivering the heating benefits of an electric heater while maintaining the efficiency benefits of a heat pump.





The owner may choose between fan cycling or fan continuous mode based on property preference. (Note: Even heat

Separate Heat/Cool .

monitoring and quiet start/stop fan delay only operate in fan cycle mode) Fan continuous mode is used to keep constant

airflow circulation in the room during all times the unit is ‘ON’. Fan cycle will conserve energy by only operating the

Fan Cycle Control

fan while the compressor or electric heater is operating. The ability to set the fan cycling condition independently


between heating and cooling mode will increase user comfort by allowing the choice of only constantly circulating


air in the summer or winter time. Unlike other PTAC brands that only allow one selection.



Emergency Heat

In the event of a compressor failure in heat pump mode the compressor may be locked out to provide heat through the

resistance heater. This feature ensures that even in the unlikely event of a compressor failure the room temperature can


be maintained until the compressor can be serviced.




Desk Control

All Friedrich digital PTACs have low voltage terminals ready to connect a desk control energy management system.

Controlling the unit from a remote location like the front desk can reduce energy usage and requires no additional


accessories on the PTAC unit.




Indoor Coil Frost

The frost sensor protects the compressor from damage in the event that airflow is reduced or low outdoor temperatures

cause the indoor coil to freeze. When the indoor coil reaches 30° F the compressor is disabled and the fan continues to


operate based on demand. Once the coil temperature returns to 45° F the compressor returns to operation.





The new Friedrich PD series units feature an indoor fan system design that reduces sound levels without lowering airflow


and preventing proper air circulation.



High Efficiency

The Friedrich PTAC benefits from quality components and extensive development to ensure a quiet, efficient and

dependable unit.




Dual Motor

Friedrich's new dual motor design allows for the quietest and most efficient units yet.



Rotary Compressor

High efficiency rotary compressors are used on all Friedrich PTACs to maximize durability and efficiency.



Stainless Steel Endplates

Outdoor coil endplates made from stainless steel reduce corrosion on the outdoor coil common with other coil designs.




Diamonblue (seacoast protection) protects the outdoor coil from harsh environments. Comes standard on all


PTAC units.



Top Mounted

All Friedrich PTAC return air filters feature an anti-microbialelement that has proven to prevent mold and bacterial


growth in laboratory testing. PDXRTA replacement filter kits feature the same anti-microbialagent. All filter are

Air Filters

washable and reusable and are easily accessed from the top of the unit without the removal of the front cover.



Filtered Fresh Air

Friedrich PTAC units are capable of introducing up to 75 CFM of outside air into the conditioned space. The


outdoor air passes through a mesh screen to prevent debris from entering the air stream.




System Configuration

Fresh Air Vent Control

The vent control lever is located on the left side of the unit, behind the front panel.

NOTE: The vent door shipping hardware must be removed before usingtheventcontrollever. Seepage17,Figure21,(Remove Shipping Screw from Vent Door if present).

When vent door is set to CLOSE,only the air inside the room is circulated and filtered, See Figure 28.

WhenventdoorissettoOPEN,someoutdoorairwillbedrawnintoroom. This may reduce heating or cooling efficiency.

Figure 28


Air Vent Control Location



(Pull lever through


label to operate)







Adjusting Air

To adjust air direction:

1.Remove front panel. See Figure 22.

2.Remove louver screws that hold louver insert in place (from back side of front panel). See Figure 29.

3.Turn louver insert and rotate 180°. See Figure 30.

4.Replace louver insert.

5.Replace screws and front panel.

Figure 29

Backside of Front Panel



Figure 30


Adjusting Louvers








Digital Control User Input Configuration

The adjustable control dip switches are located at the lower left hand portion of the digital Smart Center. The inputs are only visible and accessible with the front cover removed from the PTAC.

Dip Switch Setting

1.Emergency Heat Override – Switch 1

In the unlikely event of a compressor failure a heat pump unit may be switched to operate in only the electric heat mode until repairs can be made. Moving Dip Switch 1 to ‘ON’.

2.Wall Thermostat Switch 2

In order to enable the wall thermostat move Dip Switch to 'ON'.

3.Fan Cycle Control – Switch 3-4

All PTACs are shipped from the factory with Dip Switch 3-4in the ‘OFF’ position. In this position the cooling fan cycle will run continuously providing air circulation during the warm months. The heating fan cycle is set to 'cycle' on and off. The fan may be set to 'continuous' mode by switching Dip Switch 3 to 'ON' position.

4.Electronic Temperature Limiting – Switches 5-6

The digital control is set from the factory to allow a temperature range between 61° F and 86° F in both heating and cooling mode. Dip Switches 5-6can be used to set high and low limits for either heating both, cooling both or both.

From the factory switches are in the down 'OFF' position. The chart below shows the available electronic limiting ranges.

5.Room Freeze Protection – Switch 7

Units are shipped from the factory with the room freeze protection enabled. Room Freeze Protection can be switched off at the owner’s preference by moving Dip Switch 7 to ‘OFF’. This feature will monitor the indoor room conditions and in the event that the room falls below 40°F the unit will cycle on high fan with the electric heater. This occurs regardless of mode.

Figure 31

Dip Switches



























































































































Freeze guard


















































Setpoint Limit 2




















































Setpoint Limit 1




























Fan CON/CYC for cooling

























Fan CON/CYC for heating

























Wall Thermostat enable



























Electric heat only (for Heat Pumps)







































































































Factory Setting










Emergency Heat Override

Enables electric heat only operation in the event of a com-

Down - Normal Operation


Up - Overrides compressor operation.




for PDH Heat Pump


pressor failure on HP models.







(PDH models only)































Wall Thermostat Switch


Enables the use of a wall thermostat or unit controls

Down - Unit Controls



Up - Enables Wall Thermostat Usage



























Fan Cycle for Heating


Allows selection of continuous fan or cycling in heating mode.

Down - Cycle



Up - Continuous





























Fan Cycle for Cooling


Allows selection of continuous fan or cycling in cooling mode.

Down - Continuous



Up - Cycle





























Setpoint Switch 1


Allows the temperature setpoint range to be adjusted.







































Setpoint Switch 2













































Room Freeze Protection


Allows the unit to ensure the indoor room temperature does

Down - Freeze Protection Enabled

Up - Freeze Protection Disabled











not fall below 40F even when turned off.







































Digital Control Operation

Figure 32

Digital Control Panel

°F vs. °C Display

The unit is factory configured to display all temperatures in degrees Fahrenheit (° F). To switch to degrees Celsius press the ‘Fan Only’ and ‘LowFan’buttonssimultaneouslyforthreeseconds.Thedisplaywillshow a ‘C’ as acknowledgement of the change. To revert back to ° F press the ‘Fan Only’ and ‘Low Fan’ buttons simultaneously for three seconds. The display will show an ‘F’ as acknowledgement of the change.

Cooling Mode

Pressing the ‘Cool’ button while the unit is in any mode, including off, will put the unit into cooling mode. Adjust the temperature readout to the desired room temperature and the unit will cycle the compressor on and offtomaintainacomfortableroom.Thecompressorwillcomeonanytime that the room temperature is 1.8° F above the desired temperature. The fan operation is dependent on the fan mode selected, either continuous or cycling. See Fan Mode for fan cycle control.

Heating Mode

Pressing the ‘Heat’ button while the unit is in any mode, including off, will put the unit into heating mode.

Heat Pump Models (PDH)

Whenthe‘Heat’buttonispressedinitiallytheunitwillenergizetheelectric resistanceheattoquicklybringtheroomtothesettemperature. Whenthe desiredroomtemperaturefalls1.8°Fbelowthedesiredsettemperaturethe unit will cycle the compressor on and operate as a heat pump to maintain the room temperature while running more efficiently than resistance heat only models. If the room temperature should fall more than 5° F from the set temperature the unit will run the resistance heater. The fan operation is dependent on the fan mode selected, either continuous or cycling. Dip switch 3 controls the fan mode, see page 23 for setting.

Whentheoutdoorcoiltemperaturefallsbelow30°Fformorethan2minutes the unit will operate the resistance heaters and not the compressor. When the outdoor coil temperature reaches 45° F the compressor will be allowed to operate again.


Heat/Cool Models (PDE)

After pressing the ‘Heat’ button, adjust the temperature readout to the desired room temperature and the unit will cycle the resistance heat on and off to maintain a comfortable room. The heater will come on anytime that the room temperature is 1.8° F below the desired temperature. The fan operation is dependent on the fan mode selected, either continuous or cycling. Dip switch 3 controls the fan mode, see page 23 for setting.

Emergency Heat Operation

Intheeventofacompressorfailureinheatpumpmodethecompressormay be locked out to provide heat through the resistance heater. This feature ensures that even in the unlikely event of a compressor failure the room temperaturecanbemaintaineduntilthecompressorcanbeserviced.Dip switch 1 controls the emergency heat setting, see page 23.

Fan Mode

Allunitsareshippedwithfanmodesettocontinuousforcoolingandcycle for heating.

Fan Only Mode

Pressing the ‘Fan’ button will run the fan to allow for air circulation in the room without operating the compressor or heater regardless of the room or set temperature. The fan speed selection is made by pressing either the ‘High Fan’, ‘Med Fan’ or ‘Low Fan’ button.


Theownermaychoosebetweenfancyclingorfancontinuousmodebased on property preference (Note: Even heat monitoring and quiet start/stop fan delay only operate in fan cycle mode). Fan continuous mode is used to keep constant airflow circulation in the room during all times the unit is ‘ON’. Fan cycle will conserve energy by only operating the fan while the compressororelectricheaterisoperating.Dipswitch3-4controlsthefanmode, see page 23 for setting.


Remote Control Thermostat


Install Thermostat

1.Approximately 5 ft. from the floor.


3.On a section of wall without pipes or ductwork.

The Thermostat should NOT be mounted:

1.Close to a window, on an outside wall, or next to a door leading outside.

2.Whereitcanbeexposedtodirectsunlightorheat,suchasthesun, a lamp, fireplace, or any ther temperatureradiating object which may cause a false reading.

3.Close to or in the direct airflow of supply registers and/or return air grilles.

4.Any areas with poor air circulation, such as a corner, behind a door, or an alcove.

Remote Thermostat and Low Voltage Control Connections

Remote Thermostat

All Friedrich PD model PTAC units are factory configured to be controlled byeitherthechassismountedSmartCenterora24Vremotewallmounted thermostat.Thethermostatmaybeautoormanualchangeoveraslongas the control configuration matches that of the PTAC unit.

NOTE: All PDE models require a single stage cool, single stage heat thermostat. All PDH models require a single stage cool, dual stage heat thermostat with an O reversing valve control. The Friedrich RT6 thermostat can be configured for either model.

Tocontroltheunitwithawallmountedthermostat follow the steps below:

1.Unplug the unit before doing any work.

2.Withthefrontcoverremovedlocatethedipswitcheslocatedbelow the Smart Center control panel. See page 23. Switch Dip switch 2 to the up on 'ON' position.

3.Remove the low voltage terminal block from the unit.

4.Connect the corresponding terminals from the wall thermostat to the terminal block.

5.Replace the terminal block on the unit.

6.Restore power to the unit.

7.The unit is now controlled by the wall thermostat only.

8.If the accessory escutcheon kit (PDXRTA) is to be used, install it over the existing control panel.

NOTE: Theunitmountedcontrolsnolongercontroltheunit. Torestore the unit mounted controls move dip switch 2 to the down or 'OFF' position.

Thermostat Connections

R = 24V Power from Unit Y = Call for Cooling

W = Call for Heating

O = Reversing Valve Energized in cooling mode (PDH Models Only) GL = Call for Low Fan

GH = Call for High Fan C = Common Ground

*If only one G terminal is present on thermostat connect to GL for low speed fan or to GH for high speed fan operation.

Figure 33

Control board with optional PDXRT escutcheon kit installed



Desk Control Terminals

The Friedrich PD model PTAC has built-inprovisions for connection to an external switch to control power to the unit. The switch can be a central desk control system or even a normally open door switch.

FordeskcontroloperationconnectonesideoftheswitchtotheD1terminal and the other to the D2 terminal (See Figure 31, Page 23). Whenever the switch closes the unit operation will stop.

NOTE: The desk control system and switches must be field supplied.

Energy Management

Sometimes known as Front Desk Control, an input is provided so that the unit can be manually disabled from a remote location. If the unit detects 24Vac on this input, it will automatically turn itself off. If no voltage is detected on the input , the unit will run normally.

NOTE: Itistheinstaller'sresponsibilitytoensurethatallcontrolwiring connections are made in accordance with the installation instructions. Improper connection of the thermostat control wiring and/or tampering with the unit's internal wiring can void the equipment warranty. Other manufacturer's PTACs and even older Friedrich models may have different control wire connections. Questions concerning proper connections to the unit should be directed to Friedrich.


Electrical Shock Hazard

Turn off electrical power before service or installation.

ALL electrical connections and wiring MUST be installed by a qualified electrician and conform to the National Code and all local codes which have jurisdiction.

Improper connection of the thermostat control wiring and/or tampering with the units internal wiring may result in property damage, personal injury or death.


Final Inspection & Start-upChecklist

qInspect and ensure that all components and accessories have been installed properly and that they have not been damaged during the installation process.

qCheckthecondensatewaterdrain(s)toensuretheyareadequatefor the removal of condensate water, and that they meet the approval of the end user.

qEnsure that all installations concerning clearances around the unit have been adhered to. Check to ensure that the unit air filter, indoor coil, and outdoor coil are free from any obstructions.

qEnsure that the entire installation is in compliance with all applicable national and local codes and ordinances that have jurisdiction.

qSecurecomponentsandaccessories,suchasthechassis,decorative front cover and control door.

qStart the unit and check for proper operation of all components in each mode of operation. Instruct the owner or operator of this units operation,andthemanufacturer’srecommendedroutinemaintenance schedule.

NOTE: A log for recording the dates of maintenance and/or service is recommended.

qPresent the owner or operator of the equipment with the Installation & Operation manual, all accessory installation instructions, and the name, address and telephone number of the Authorized Friedrich Warranty Service Company in the area for future reference if necessary.

Routine Maintenance

To ensure proper unit operation and life expectancy the following maintenance procedures should be performed on a regular basis.


Electrical Shock Hazard

Unplug Unit or turn off electrical power to unit prior to performing maintenance procedures.

Failure to do so can result in electrical shock or death.

Air Filter

To ensure proper unit operation, the air filters should be cleaned at least monthly,andmorefrequentlyifconditionswarrant.Theunitmustbeturned off before the filters are cleaned.

To remove the air filters, grasp the top of the filter and lift out of the front cabinet. Reverse the procedure to reinstall the filters.

Cleanthefilterswithamilddetergentinwarmwater,andallowthemtodry thoroughly before reinstalling.

Coils & Chassis

NOTE: Do not use a caustic coil cleaning agent on coils or base pan. Use a biodegradable cleaning agent and degreaser. The use of harsh cleaning materials may lead to deterioration of the aluminum fins or the coil end plates.

The indoor coil and outdoor coils and base pan should be inspected periodically (annually or semi-annually)and cleaned of all debris (lint, dirt. leaves,paper,etc.)asnecessary. Underextremeconditions,morefrequent cleaning may by required. Clean the coils and base pan with a soft brush and compressed air or vacuum. A pressure washer may also be used,

however, you must be careful not to bend the aluminium fin pack. Use a sweeping up and down motion in the direction of the vertical aluminium fin pack when pressure cleaning coils.

NOTE: It is extremely important to insure that none of the electrical and/or electronic parts of the unit get wet. Be sure to cover all electrical components to protect them from water or spray.

Decorative Front

The decorative front and discharge air grille may be cleaned with a mild soap or detergent. Do NOT use solvents or hydrocarbon based cleaners suchasacetone,naphtha,gasoline,benzene,etc.,tocleanthedecorative front or air discharge grilles.

Use a damp (not wet) cloth when cleaning the control area to prevent waterfromenteringtheunit,andpossiblydamagingtheelectroniccontrol.

Fan Motor & Compressor

The fan motor & compressor and are permanently lubricated, and require no additional lubrication.

Wall Sleeve

Inspecttheinsideofthewallsleeveanddrainsystemperiodically(annually or semi-annually)and clean as required.

Under extreme conditions, more frequent cleaning may be necessary. Clean both of these areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and ensure that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as needed.


Basic Troubleshooting










Unit turned off.


Turn unit on




Thermostat is satisfied.


Raise/Lower temperature setting.



●● LCDI power cord is unplugged.

●● Plug into a properly grounded 3 prong recep-






tacle. See "Electrical Rating Tables" on page






13 for the proper receptacle type for your unit.


Unit does not operate.

●● LCDI power cord has tripped.

●● Press and release RESET (listen for click;





Reset button latches and remains in) to











resume operation.



●● Circuit breaker has tripped.

●● Reset the circuit breaker.



●● Supply circuit fuse has blown.


Replace the fuse.




Local power failure.

●● Unit will resume normal operation once power






has been restored.



●● Other appliances being used on same

●● The unit requires a single outlet circuit, not






shared with other appliances.


Unit trips circuit breaker or

●● An extension cord is being used.

●● Do NOT use an extension cord with this or





any other air conditioner.


blows fuses.

●● Circuit breaker or time-delayfuse isn't

●● Replace circuit breaker or time-delayfuse






of the proper rating.


for the proper rating. See "Electrical Rating






Tables” on page 13. If problem continues






contact a licensed electrician.


LCDI Power Cord Trips


The LCDI Power cord can trip (Reset

●● Press and release RESET (listen for click;


(Reset Button Pops Out)


button POPS out) due to disturbances


Reset button latches and remains in) to


A damaged power supply cord must be


on your power supply line.


resume normal operation.


Electrical overload, overheating or

●● Once the problem has been determined and


replaced with a new power supply cord


cord pinching can trip (Reset button


corrected, press and release RESET (listen


obtained from the product manufacturer


POPS out) the LCDI power cord.


for click; Reset button latches and remains in)


and must not be repaired.




to resume normal operation.



●● The return/discharge air grille is

●● Ensure that the return and/or discharge air






paths are not blocked by curtains, blinds,






furniture, etc



●● Windows or doors to the outside are

●● Ensure that all windows and door are closed.









●● The temperature is not set at a cool

●● Adjust the temperature control to a cooler or




enough/warm enough setting.


warmer setting as necessary.



●● The filter is dirty or obstructed.

●● Clean the filter, (See Recommended Mainte-






nance) or remove obstruction.



●● The indoor coil or outdoor coil is dirty

●● Clean the coils, (See Recommended Mainte-




or obstructed.


nance) or remove obstruction.



●● The temperature of the room you are

●● Allow additional time too cool a very hot room

Unit does not cool/heat room sufficiently, or cycles


trying to cool is extremely hot.




The outside temperature is below

●● Do not try to operate your air conditioner in


on and off too frequently




60º F.


the cooling in the cooling mode when the






outside temperature is below 60º F. The unit






will not cool properly, and the unit may be









●● The digital control is set to fan cycling

●● Since the fan does not circulate the room






air continuously at this setting, the room air






does not mix as well and hot (or cold) spots






may result. Using the continuous fan setting






is recommended to obtain optimum comfort









●● The air conditioner has insufficient

●● Check the cooling capacity of your unit to en-




cooling capacity to match the heat


sure it is properly sized for the room in which




gain of the room.


it is installed. Room air conditioners are not






designed to cool multiple rooms.





Unit does not cool/heat room sufficiently, or cycles

●● The air conditioner has insufficient

●● Check the heating capacity of your unit. Air

on and off too frequently

heating capacity to match the heat

conditioners are sized to meet the cooling


loss of the room.

load and heater size is then selected to meet



the heating load. In extreme, northern cli-



mates, room air conditioners may not be able



to be used as a primary source of heat.


●● This may be due to an excessive heat

●● If there are heat product appliances in use in


load in the room.

the room, or if the room is heavily occupied,



the unit will need to run loner to remove the



additional heat.



●● Be sure to use exhaust vent fans while cook-



ing or bathing and, if possible, try not to use



heat producing appliances during the hottest



part of the day. It may also be due to an



improperly sized unit.



●● Depending upon the size of the room being



cooled, a higher capacity air conditioner may



be necessary


●● This may be normal for higher ef-

●● The use of higher efficiency components in

Unit runs too much

ficiency (EER) air conditioners.

your new air conditioner may result in the unit



running longer than you feel it should . This



may be more apparent, if it replaced an older,



less efficient, model. The actual energy us-



age, however, will be significantly less when



compared to older models.



●● Likewise, you may notice that the discharge



air temperature of your new air conditioner



may not seem as cold as you may be ac-



customed to from older units. This does not,



however, indicate a reduction in the cooling



capacity of the unit



●● The energy efficiency ratio (EER) and cooling



rating (Btu/h) listed on the unit's rating plate



are both agency certified.

Service & Assistance

Before calling for service, please check the "Basic Troubleshooting" section above. This may help you to find the answer to your problem, avoid unnecessary service calls, and save you the cost of a service call if the problem is not due to the product itself. If you have checked the "Basic Troubleshooting" section and still need help, here is a list of available services:

YoucanfindthenameofyoulocalAuthorizedServiceProviderbyvisiting our web site at

If you require further assistance you can call the Customer Support Call Center at 1-800-541-6645.

Before calling, please make sure that you have the complete model and serialnumber,anddateofpurchaseofyourequipmentavailable.Byproviding us with this information we will be better able to assist you.

Our specialists are able to assist you with:

*Inspect and ensure that all components and accessories have been installed properly and that they have not been damaged during the installation.

*Specifications and Features of our equipment

*Referrals to dealers, and distributors.

*Use and Care information

*Recommended maintenance procedures

*Installation information

*Referrals to Authorized Service Providers and Parts depots.



New Construction Accessories


WALL SLEEVE Galvanized zinc coated steel is prepared in an11-stepprocess,


then powder coated with a polyester finish and cured in an oven for exceptional


durability. The wall sleeve is insulated for sound absorption and thermal ef-


ficiency, 16" High x 42" Wide x 13 3/4" Deep..





DEEP WALL SLEEVE EXTENSION For use when the wall is thicker than 13


1/4”deep. The wall sleeve may be special ordered through your Sales Represen-


tative and will be cut to your specific depth requirements..


GRILLE Standard, stamped aluminium, anodized to resist chalking and oxidation.





ARCHITECTURAL GRILLES Consist ofheavy-gauge6063-T5aluminum alloy:


PXAA – Clear, extruded aluminum


PXBG – Beige acrylic enamel


PXSC – Also available in custom colors.


CONDENSATE DRAIN KIT Attaches to the bottom of the wall sleeve for internal


draining of condensate or to the rear wall sleeve flange for external draining.


Recommended on all units to remove excess condensate. Packaged in quantities


of ten.




DECORATIVE SUBBASE Provides unit support for walls less than six inches


thick. Includes leveling legs, side filler panels and mounting brackets for electri-


cal accessories. Accepts circuit breaker, power disconnect switch, or conduit kit.




DIGITAL REMOTE WALL THERMOSTAT Single stage cool, single stage heat


for PDE models or single stage cool, dual stage heat for PDH model thermostat


features high/low fan speed switch. Thermostat is hard wired and can be battery


powered or unit powered. Features backlit display and multiple configuration


modes. For use on PD-seriesFriedrich PTACs andVert-I-Paks.




REMOTE THERMOSTAT ESCUTCHEON KIT This kit contains ten escutcheons


that can be placed over the factory control buttons when a remote wall mounted


thermostat is used. The escutcheon directs the guest to the wall thermostat for


operation and retains the LED window to display error codes and diagnostic









SLEEVE EXTENSION RETROFIT KIT Galvanized zinc coated steel, 2.4" sleeve


extension attached to the room side of the sleeve to allow for the installation of a


PD-SeriesFriedrich PTAC in aT-Seriessleeve.




LATERAL DUCT ADAPTER Attaches to the PTAC/PTHP unit and provides a


transition to direct up to 35% of the total CFM to a secondary room, either left or


right of the unit. Kit includes duct plenum with discharge grille and internal baffle,


adapter and end cap.



LATERAL DUCT EXTENSION Athree-footinsulated plenum that attaches to


the left or right side of the duct adapter. The extension can be cut to length by the


installer. Maximum allowable straight extension is 15 feet.