Friedrich RT5 User Manual

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RT5

1 Heat/1 Cool

Manual Changeover

Battery or Hardwired

Non-ProgrammableElectronic Thermostat

For use with Friedrich PTAC units ONLY

Backlit Display

Filter Check

Status Indicator Light

Relay Outputs

(minimum voltage drop in thermostat)

Two-SpeedFan

Installation, Operation & Application Guide

Table of Contents

Parts Diagram...............................................................................................................................................

1

Specifications ...............................................................................................................................................

2

Important Safety Information ........................................................................................................................

2

Package Contents/Tools Required ...............................................................................................................

2

To Remove Existing Thermostat...................................................................................................................

3

To Install Thermostat ....................................................................................................................................

3

Wiring Diagrams...........................................................................................................................................

5

Configuration Mode ......................................................................................................................................

6

Testing the Thermostat .................................................................................................................................

9

Mode of Operation......................................................................................................................................

10

Troubleshooting...........................................................................................................................................

11

Parts Diagram

1

Specifications

Electrical rating:

24 VAC (18-30VAC)

DC Power: 3.0 VDC (2 “AA” batteries included)

1 amp maximum per terminal

3 amp maximum total load

Temperature control range: 45°F to 90°F (7°C to 32°C)

Accuracy: ± 1°F (± 0.5°C)

System configurations: 1-stageheat,1-stagecool, heat pump, electric

Timing: Anti-shortCycle:5 minutes

Backlight Operation: Battery for 5 seconds, hardwired for 10 seconds

Terminations: RC, RH, W, Y, B, O, GL, GH, C

Important Safety Information

WARNING!: Always turn off power at the main power supply before installing, cleaning, or removing thermostat.

This thermostat is for 24 VAC applications only; do not use on voltages over 30 VAC

Do not short across terminals of system control to test operation; this will damage your thermostat and void your warranty

All wiring must conform to local and national electrical and building codes

Do not use air conditioning when the outdoor temperature is below 50 degrees; this can damage your A/C system and cause personal injuries

Use this thermostat only as described in this manual

Package Contents/Tools Required

Package includes: RT5 thermostat on base, thermostat cover, wiring labels, screws and wall anchors, Installation, Operation and Application Guide

Tools required for installation: Drill with 3/16" bit, hammer, screwdriver

2

To Remove Existing Thermostat

ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

1.Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.

2.Remove cover of old thermostat. This should expose the wires.

3.Label the existing wires with the enclosed wire labels before removing wires.

4.After labeling wires, remove wires from wire terminals.

5.Remove existing thermostat base from wall.

6.Refer to the following section for instructions on how to install this thermostat.

To Install Thermostat

ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

IMPORTANT: Thermostat installation must conform to local and national building and electrical codes and ordinances.

Note: Mount the thermostat about five feet above the floor. Do not mount the thermostat on an outside wall, in direct sunlight, behind a door, or in an area affected by a vent or duct.

1.Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.

3

To Install Thermostat (continued)

2.To remove cover, insert and twist a coin or screwdriver in the slots on the sides of the thermostat.

3.Put thermostat base against the wall where you plan to mount it (Be sure wires will feed through the wire opening in the base of the thermostat).

4.Mark the placement of the mounting holes.

5.Set thermostat base and cover away from working area.

6.Using a 3/16” drill bit, drill holes in the places you have marked for mounting.

7.Use a hammer to tap supplied anchors in mounting holes.

8.Align thermostat base with mounting holes and feed the control wires through wire opening.

9.Use supplied screws to mount thermostat base to wall.

10.Insert stripped, labeled wires in matching wire terminals. See “Wiring Diagram” section of this manual (Page 5).

CAUTION!: Be sure exposed portion of wires does not touch other wires.

11.Tighten screws on terminal block. Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper terminal.

12.Seal hole for wires behind thermostat with non-flammableinsulation or putty.

13.Set Elec/Gas switch to

Electric = heat pump, electric strip heat

14.Replace cover on thermostat by snapping it in place.

15.Turn on power to the system at the main service panel.

16.Test thermostat operation as described in “Testing the Thermostat” (Page 9).

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HARDWIRED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

 

 

C

 

 

C

 

 

 

 

 

 

 

 

 

 

 

RH

 

 

 

 

 

 

 

 

 

R

 

 

R

 

 

RC

 

 

I

P

 

 

 

 

 

 

W

 

 

W

 

E

 

 

 

 

T

 

Y

 

 

Y

 

D

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

R

C

 

B

 

 

B

 

I

 

 

 

 

 

O

 

C

 

GL

 

 

GL

 

 

 

 

 

H

 

GH

 

 

GH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRE-INSTALLEDJUMPER

T

H

E

R

M

O

S

T

A

T

5

Configuration Mode

The configuration mode is used to set the RT5 to match your heating/cooling system. The RT5 functions with Friedrich PTAC models.

Ensure that the thermostat is configured for air conditioning with ELECTRIC HEAT ONLY.

To configure the RT5, perform the following steps:

1.Remove the cover of the thermostat by gently pulling on one of the corners.

2.Simultaneously hold the SW5 andSW6 buttons in for 5 seconds while the RT5 is inOFF mode.

3.Press the orbutton to change settings within each screen.

4.Press the SW6 button to advance to the next screen.

Note: TheSW5 button will return you to the previous screen.

5.To exit configuration mode, slide the Mode switch toHeat orCool.

Configuration Mode Settings

The nine (9) setup screens for Configuration Mode are as follows:

1.Heat pump and Non Heat Pump – Press theorbutton to configure as heat pump, ornon-heatpump system. For heat pumps, there will be ananti-shortcycle delay for heating and cooling

• 0 = Non-heatpump system

Press the SW6 button to advance to the next screen.

2.Temperature Scale (F or C) – Choose Fahrenheit or Celsius.

Press the orbutton to select.

Press the SW6 button to advance to the next screen.

SET

REMOTE

 

ROOM

 

DIFF

 

FILTER

 

SET

REMOTE

 

ROOM

 

DIFF

 

FILTER

 

6

Configuration Mode Settings (continued)

3.Temperature Differential (1°F to 3°F) (0.5°C to 1.5°C) – Set the number of degrees between your “setpoint” temperature and your “turn on” temperature.

Press the orbutton to set differential value. Press theSW6 button to advance to the next screen.

4.Minimum Cool Setpoint (45°F to 75°F) (7°C to 24.0°C) Adjust to control the minimum Cool set temperature allowed. Press theorbutton to select.

Press the SW6 button to advance to the next screen.

5.Maximum Heat Setpoint (55°F to 90°F) (13°C to 32°C) Adjust to control the maximum Heat set temperature allowed. Press theorbutton to select.

Press the SW6 button to advance to the next screen.

SET

ROOM

DIFF

FILTER

SET

ROOM

DIFF

FILTER

SET

ROOM

DIFF

FILTER

SET

ROOM

DIFF

FILTER

SET

ROOM

DIFF

FILTER

REMOTE

REMOTE

REMOTE

REMOTE

REMOTE

7

6. Room temperature offset (+9°F to-9°F)(+4.5°C to-4.5°C)

Adjust to calibrate displayed room temperature to match actual room temperature. Note: When not set to 0,ROOM will display

Press the orbutton to select.

Press the SW6 button to advance to the next screen.

7.Maximum compressor cycles allowed per hour (-, 2-6)

-= as many as needed, 2-6= maximum cycles/hour Press theorbutton to select.

Press the SW6 button to advance to the next screen.

8.Filter Check time (300-800, – – –)

Set Fan Run Time (in hours) whenCheck Filter is displayed or set to – – – to disable. Press theorbutton to select.

Note: To reset filter counter to zero and clearfilter warning, press theandbuttons simultaneously for 5 seconds.

Press the SW6 button to advance to the next screen.

9.Status Indicator Light (Lt 0 or 1) 0 = Status indicator never on

1 = Status indicator on with first stage Press the orbutton to select.

Note: Red light indicates heating cycle and green light indicates cooling cycle Slide theMode switch toHeat orCool to exit configuration.

SET

REMOTE

 

ROOM

 

DIFF

 

FILTER

 

SET

REMOTE

 

ROOM

 

DIFF

 

FILTER

 

SET

REMOTE

 

ROOM

 

DIFF

 

FILTER

 

(500 Hours)

SET

REMOTE

 

ROOM

 

DIFF

 

FILTER

 

8

Testing the Thermostat

Once the thermostat is installed, it should be thoroughly tested.

CAUTION!: Do not energize the air conditioning system when the outdoor temperature is below 50 degrees. It can result in equipment damage or personal injury.

Cool Test

1.

Slide Mode switch toCool mode.

 

2.

Adjust set temperature so it is 5 degrees below room temperature.

Cool Off Heat

3.

Air conditioning should come on within a few seconds. Status indicator may come on.

4.Adjust the set temperature 2 degrees above the room temperature and the A/C should turn off. There may be a fan delay on your system.

Note: There is a five minute time delay to protect the compressor after it turns off. To temporarily bypass the five minute delay, slide theMode switch toOFF for 2 seconds and then back toCool.

Heat Test

1.Slide Mode switch toHeat mode.

2.Adjust the set temperature so it is 5 degrees above the room temperature.

3.

Heat should come on within a few seconds. Status indicator may come on.

Cool Off Heat

4.

Adjust the set temperature so it is 2 degrees below the room

 

 

temperature and the heat should turn off. There may be a fan delay on your system.

 

Note: For heat pumps, there is a five minute time delay to protect the compressor after it turns off. To temporarily bypass the five minute delay, slide theMode switch toOFF for 2 seconds and then back toHeat.

(Testing the thermostat continued on Page 10)

9

(Testing the thermostat continued from Page 9)

Fan Test

1.

Slide Fan switch toOn position.

3.

Slide Fan switch toAuto position.

2.

Indoor fan turns on.

4.

Indoor fan turns off.

 

Auto On

 

Auto On

Mode of Operation

The RT5 is a single-stageheat,single-stagecool thermostat.

The RT5 can use 24 VAC or batteries as a power supply. The RT5 can be hardwired and have no batteries installed in the battery compartment. It can also run on battery power only. When batteries are installed and the thermostat is hardwired, the batteries will run the thermostat during a power outage.

When operating on battery power, the backlight will be on for 5 second intervals. When hardwired, the backlight will be on for 10 second intervals.

The thermostat activates a heating appliance when the room temperature is below the heat set temperature (by the differential temperature). It will turn off when the room temperature is one degree above the heat set temperature. With heat pumps, the thermostat will not let the compressor come on for five minutes after it turns off. This protects your compressor.

When the room temperature is greater than the cool set temperature (by the differential temperature), the cooling device is activated. It will turn off when the room temperature is one degree below the cool set temperature. The thermostat will not let the compressor come on for five minutes after it turns off. This protects your compressor.

The RT5 has the following operating modes: OFF,Heat andCool. InOFF mode, the thermostat will not turn on heating or cooling devices. In theHeat mode, the thermostat controls the heating system. In theCool mode, the thermostat controls the cooling system. The indoor fan can be turned on in all operating modes using theFan switch.

10

 

Troubleshooting

 

 

Symptom

Remedy

No display

For Hardwired Installation

 

Check for 24 VAC at thermostat; display is blank when 24 VAC is not present

 

For Battery Installation

 

Display is blank when batteries are drained or installed incorrectly

System fan does not come on

Verify wiring is correct

properly

Check position of gas/electric switch

 

Thermostat turns on and off too

Adjust temperature differential (see “Temperature Differential,” Step 3, Page 6)

frequently

 

Fan runs continuously

Check fan On/Auto switch, ON position runs indoor fan continuously

Fan operates at wrong speed

Slide High/Low fan switch to correct position

Room temperature is not correct

Verify wall hole is plugged with putty or insulation; calibrate thermostat (see “Configuration,”

 

Step 6, Page 8)

ROOM displays

Room temperature offset is not zero (see “Configuration,” Step 6, Page 8)

Status indicator

Green light – Cooling operation

 

Red light – Heating operating

 

Status indicator option ON (see “Configuration,” Step 9, Page 8)

filter displays

Fan run time has exceeded filter check time set in configuration (see “Configuration,” Step 8,

 

Page 8)

 

To reset counter to zero and clear filter warning, press the and button simultaneously

 

for 5 seconds

11

Friedrich Air Conditioning Co.

Post Office Box 1540 • San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway • San Antonio, Texas 78218-5212(210)357-4400• FAX (210)357-4480

www.friedrich.com