Friedrich Thermostat RT5 User Manual

1 Heat/1 Cool  
Manual Changeover  
Battery or Hardwired  
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  
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Parts Diagram  
1
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Specifications  
Electrical rating: • 24 VAC (18-30 VAC)  
• 1 amp maximum per terminal  
DC Power: 3.0 VDC (2 “AA” batteries included)  
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 congurations: 1-stage heat, 1-stage cool, heat pump, electric  
Timing: Anti-short Cycle: 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
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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 ve feet above the 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.  
3
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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-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).  
4
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HARDWIRED  
PRE-INSTALLED JUMPER  
C
C
T
F
R
I
E
D
R
I
RH  
RC  
W
H
E
R
M
O
S
T
R
W
Y
P
T
A
C
Y
B
B
O
C
H
GL  
GL  
GH  
A
T
GH  
5
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Configuration Mode  
The conguration 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 congured for air conditioning with ELECTRIC HEAT ONLY.  
To congure 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 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 SW6 button to advance to the next screen.  
Note: The SW5 button will return you to the previous screen.  
5. To exit conguration mode, slide the Mode switch to Heat or Cool.  
Conguration Mode Settings  
The nine (9) setup screens for Conguration Mode are as follows:  
1. Heat pump and Non Heat Pump – Press the  
non-heat pump system. For heat pumps, there will be an anti-short cycle delay for heating  
and cooling  
• 0 = Non-heat pump system  
Press the SW6 button to advance to the next screen.  
or  
button to congure as heat pump, or  
REMOTE  
SET  
ROOM  
DIFF  
FILTER  
2. Temperature Scale (F or C) – Choose Fahrenheit or Celsius.  
REMOTE  
Press the  
or  
button to select.  
SET  
ROOM  
Press the SW6 button to advance to the next screen.  
DIFF  
FILTER  
6
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Conguration 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.  
REMOTE  
SET  
ROOM  
Press the  
or  
button to set differential value.  
Press the SW6 button to advance to the next screen.  
DIFF  
FILTER  
4. Minimum Cool Setpoint (45°F to 75°F) (7°C to 24.0°C)  
REMOTE  
Adjust to control the minimum Cool set temperature allowed.  
SET  
ROOM  
Press the  
or  
button to select.  
DIFF  
FILTER  
Press the SW6 button to advance to the next screen.  
REMOTE  
SET  
ROOM  
DIFF  
FILTER  
5. Maximum Heat Setpoint (55°F to 90°F) (13°C to 32°C)  
REMOTE  
Adjust to control the maximum Heat set temperature allowed.  
SET  
ROOM  
Press the  
or  
button to select.  
DIFF  
FILTER  
Press the SW6 button to advance to the next screen.  
REMOTE  
SET  
ROOM  
DIFF  
FILTER  
7
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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  
REMOTE  
SET  
ROOM  
Press the  
or  
button to select.  
DIFF  
FILTER  
Press the SW6 button to advance to the next screen.  
7. Maximum compressor cycles allowed per hour (-, 2-6)  
REMOTE  
- = as many as needed, 2-6 = maximum cycles/hour  
SET  
ROOM  
Press the  
or  
button to select.  
DIFF  
FILTER  
Press the SW6 button to advance to the next screen.  
8. Filter Check time (300-800, – – –)  
Set Fan Run Time (in hours) when Check Filter is displayed or set to – – – to disable.  
REMOTE  
SET  
ROOM  
Press the  
Note: To reset lter counter to zero and clear lter warning, press  
the and buttons simultaneously for 5 seconds.  
or  
button to select.  
DIFF  
FILTER  
Press the SW6 button to advance to the next screen.  
(500 Hours)  
9. Status Indicator Light (Lt 0 or 1)  
0 = Status indicator never on  
REMOTE  
SET  
ROOM  
1 = Status indicator on with rst stage  
DIFF  
FILTER  
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 conguration.  
8
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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 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.  
There may be a fan delay on your system.  
Cool Off Heat  
Note: There is a ve minute time delay to protect the compressor after it turns off. To  
temporarily bypass the ve minute delay, slide the Mode switch to OFF for 2 seconds  
and then back to Cool.  
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  
temperature and the heat should turn off. There may be a fan delay on your system.  
Note: For heat pumps, there is a ve minute time delay to protect the compressor after  
it turns off. To temporarily bypass the ve minute delay, slide the Mode switch to  
OFF for 2 seconds and then back to Heat.  
Cool Off Heat  
(Testing the thermostat continued on Page 10)  
9
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(Testing the thermostat continued from Page 9)  
Fan Test  
1. Slide Fan switch to On position.  
2. Indoor fan turns on.  
Auto  
3. Slide Fan switch to Auto position.  
4. Indoor fan turns off.  
On  
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 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 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  
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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  
properly  
Verify wiring is correct  
Check position of gas/electric switch  
Thermostat turns on and off too  
frequently  
Adjust temperature differential (see “Temperature Differential,” Step 3, Page 6)  
Fan runs continuously  
Check fan On/Auto switch, ON position runs indoor fan continuously  
Slide High/Low fan switch to correct position  
Fan operates at wrong speed  
Room temperature is not correct  
Verify wall hole is plugged with putty or insulation; calibrate thermostat (see “Conguration,”  
Step 6, Page 8)  
ROOM displays  
Status indicator  
Room temperature offset is not zero (see “Conguration,” Step 6, Page 8)  
Green light – Cooling operation  
Red light – Heating operating  
Status indicator option ON (see “Conguration,” Step 9, Page 8)  
lter displays  
Fan run time has exceeded lter check time set in conguration (see “Conguration,” Step 8,  
Page 8)  
To reset counter to zero and clear lter warning, press the  
and  
button simultaneously  
for 5 seconds  
11  
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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  
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