RT5
Non-Programmable Electronic Thermostat
• For use with Friedrich PTAC units ONLY
• Backlit Display
• Filter Check
• Status Indicator Light
• Relay Outputs
(minimum voltage drop in thermostat)
• Two-Speed Fan
Installation, Operation & Application Guide
1 Heat/1 Cool
Manual Changeover
Battery or Hardwired
Table of Contents
Parts Diagram...............................................................................................................................................1
Specifi cations ...................................................................................................................... .........................2
Important Safety Information ........................................................................................................................ 2
Package Contents/Tools Required ...............................................................................................................2
To Remove Existing Thermostat ...................................................................................................................3
To Install Thermostat ....................................................................................................................................3
Wiring Diagrams ...........................................................................................................................................5
Confi guration Mode ...................................................................................................................................... 6
Testing the Thermostat ................................................................................................................................. 9
Mode of Operation ......................................................................................................................................10
Troubleshooting ...........................................................................................................................................11
Parts Diagram
1
Specifications
Electrical rating: • 24 VAC (18-30 VAC) • 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 confi gurations: 1-stage heat, 1-stage cool, heat pump, electric
Timing:
Anti-short Cycle:
Backlight Operation: Battery for 5 seconds, hardwired for 10 seconds
Terminations: RC, RH, W, Y, B, O, GL, GH, C
5 minutes
Important Safety Information
warning!
• 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
:
Always turn off power at the main power supply before installing, cleaning, or removing
thermostat.
Package Contents/Tools Required
Package includes: RT5 thermostat on base, thermostat cover, wiring labels, screws and wall anchors, Installation,
Tools required for installation: Drill with 3/16" bit, hammer, screwdriver
2
Operation and Application Guide
To Remove Existing Thermostat
ELECTRICAL SHOCK HAZARD
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.
– Turn off power at the main service panel by removing the
To Install Thermostat
ELECTRICAL SHOCK HAZARD
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 fi ve feet above the fl oor. 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.
– Turn off power at the main service panel by removing the
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!
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-fl ammable insulation 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).
:
Be sure exposed portion of wires does not touch other wires.
4
HARDWIRED
PRE-INSTALLED JUMPER
R
E
D
R
C
H
C
F
R
I
P
T
A
W
Y
B
C
I
GL
GH
C
RH
RC
W
Y
B
O
GL
GH
T
H
E
R
M
O
S
T
A
T
5
Configuration Mode
The confi guration 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 confi gured for air conditioning with ELECTRIC HEAT ONLY.
To confi gure the RT5, perform the following steps:
1. Remove the cover of the thermostat by gently pulling on one of the corners.
2. S
imultaneously hold the SW5 and SW6 buttons in for 5 seconds while the RT5 is in OFF mode.
3. Press the or button to change settings within each screen.
4. Press the
Note: The
5. To exit confi guration mode, slide the Mode switch to Heat or Cool.
Confi guration Mode Settings
The nine (9) setup screens for Confi guration Mode are as follows:
1. Heat pump and Non Heat Pump – Press the
• 0 = Non-heat pump system
Press the
SW6
button to advance to the next screen.
SW5
button will return you to the previous screen.
non-heat pump system. For heat pumps, there will be an anti-short cycle delay for heating
and cooling
SW6
button to advance to the next screen.
or button to confi gure as heat pump, or
SET
ROOM
DIFF
FILTER
REMOTE
2. Temperature Scale (F or C) – Choose Fahrenheit or Celsius.
Press the
Press the
or button to select.
SW6
button to advance to the next screen.
6
SET
ROOM
DIFF
FILTER
REMOTE
Confi guration 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
Press the
or button to set differential value.
SW6
button to advance to the next screen.
SET
ROOM
DIFF
FILTER
REMOTE
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 the
Press the
or button to select.
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 the or button 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
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
Press the
or button to select.
SW6 button
to advance to the next screen.
SET
ROOM
DIFF
FILTER
REMOTE
7. Maximum compressor cycles allowed per hour (-, 2-6)
- = as many as needed, 2-6 = maximum cycles/hour
Press the
Press the
8. Filter Check time (300-800, – – –)
Set Fan Run Time (in hours) when Check Filter is displayed or set to – – – to disable.
Press the
Press the
or button to select.
SW6 button
Note: To reset fi lter counter to zero and clear fi lter warning, press
the
SW6 button
to advance to the next screen.
or button to select.
and buttons simultaneously for 5 seconds.
to advance to the next screen.
9. Status Indicator Light (Lt 0 or 1)
0 = Status indicator never on
1 = Status indicator on with fi rst stage
Press the
or button to select.
Note: Red light indicates heating cycle and green light indicates cooling cycle
Slide the Mode switch to Heat or Cool to exit confi guration.
8
SET
ROOM
DIFF
FILTER
SET
ROOM
DIFF
FILTER
(500 Hours)
SET
ROOM
DIFF
FILTER
REMOTE
REMOTE
REMOTE
Testing the Thermostat
Once the thermostat is installed, it should be thoroughly tested.
caution!:
Cool Test
1. Slide Mode switch to Cool mode.
2. Adjust set temperature so it is 5 degrees below room temperature.
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.
Note: There is a fi ve minute time delay to protect the compressor after it turns off. To
Heat Test
1. Slide Mode switch to Heat 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.
4. Adjust the set temperature so it is 2 degrees below the room
Note: For heat pumps, there is a fi ve minute time delay to protect the compressor after
(Testing the thermostat continued on Page 10)
Do not energize the air conditioning system when the outdoor temperature is below 50
degrees. It can result in equipment damage or personal injury.
There may be a fan delay on your system.
temporarily bypass the fi ve minute delay, slide the Mode switch to OFF for 2 seconds
and then back to Cool.
temperature and the heat should turn off. There may be a fan delay on your system.
it turns off. To temporarily bypass the fi ve minute delay, slide the Mode switch to
OFF for 2 seconds and then back to Heat.
Cool Off Heat
Cool Off Heat
9
(Testing the thermostat continued from Page 9)
Fan Test
1. Slide Fan switch to On position.
2. Indoor fan turns on.
Auto
On
3. Slide Fan switch to Auto position.
4. Indoor fan turns off.
Auto
On
Mode of Operation
The RT5 is a single-stage heat, single-stage cool 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 fi ve 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 fi ve minutes after it turns off. This protects your compressor.
The RT5 has the following operating modes: OFF, Heat and Cool. In OFF mode, the thermostat will not turn on heating or
cooling devices. In the Heat mode, the thermostat controls the heating system. In the Cool mode, the thermostat controls
the cooling system. The indoor fan can be turned on in all operating modes using the Fan switch.
10
Troubleshooting
Symptom Remedy
No display For Hardwired Installation
System fan does not come on
properly
Thermostat turns on and off too
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 “Confi guration,”
ROOM displays Room temperature offset is not zero (see “Confi guration,” Step 6, Page 8)
Status indicator Green light – Cooling operation
fi lter displays Fan run time has exceeded fi lter check time set in confi guration (see “Confi guration,” Step 8,
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
Verify wiring is correct
Check position of gas/electric switch
Adjust temperature differential (see “Temperature Differential,” Step 3, Page 6)
Step 6, Page 8)
Red light – Heating operating
Status indicator option ON (see “Confi guration,” Step 9, Page 8)
Page 8)
To reset counter to zero and clear
for 5 seconds
fi lter warning, press the and button simultaneously
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
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