MrPEX Systems 5110519 User manual

Radiant Thermostat 5110519
Installation & Operation Manual
519
_
D
04/17
Zoning
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The Radiant Thermostat 519 accurately
controls the room and/or floor temperature
for a hydronic heating zone using Pulse
Width Modulation (PWM) technology.
Simple up and down buttons and a display
with large type make this thermostat easy
to read and use. A Slab Sensor 5110079
is included to measure floor temperature
to protect the floor from overheating and
enhance comfort. This easy to install
thermostat is a direct replacement for
the tekmar Thermostat 509.
Introduction
Energy Saving Features
• Auto Heating Cycle
Additional Features
• Radiant Floor Heating
• Pulse Width Modulation
• Floor & Air Temperature Control
• Outdoor & Floor Temperature
Display
• Backlight
• Freeze Protection
• Includes Slab Sensor 5110079

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Congratulations on the purchase of your new MrPEX® thermostat.
This manual will step through the complete installation, programming and sequence
of operation for this control. At the back, there are tips for control and system
troubleshooting.
Getting Started
Preparation
Installation
Table of Contents
Getting Started ....................................2
Installation ....................................................2
Preparation.............................................2
Removing The Thermostat Base....3
Mounting The Thermostat ................4
Slab Sensor 5110079 Installation ...5
Slab Sensor 5110079 Wiring.............6
Slab Sensor 5110079 Testing...........7
Temperature vs. Resistance Table.....7
Thermostat Wiring...............................9
Testing the Thermostat Wiring.....10
User Interface............................................. 11
Home Screen ........................................ 11
Symbols Description.......................... 11
Sequence of Operation........................... 12
Heating Operation.............................. 12
Programmable Settings.......................... 13
Troubleshooting ........................................ 14
Error Messages................................... 14
Frequently Asked Questions.......... 15
Technical Data..................................... 15
Limited Warranty and Product
Return Procedure............................... 16
Improper installation and operation of this control could result in damage to
the equipment and possibly even personal injury or death. It is your responsibility
to ensure that this control is safely installed according to all applicable codes and
standards. This electronic control is not intended for use as a primary limit control.
Other controls that are intended and certified as safety limits must be placed into
the control circuit.
Caution
• Jeweller screwdriver
• Phillips head screwdriver
• Wire Stripper
Tools Required
---------------------------------------------------------------------------------

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Choose the placement of the thermostats early in the construction process to
enable proper wiring during rough-in.
Consider the following:
• Interior Wall.
• Keep dry. Avoid potential leakage onto the control.
• Relative Humidity less than 90%. Non-condensing environment.
• No exposure to extreme temperatures beyond 32-122°F (0-50°C).
• No draft, direct sun, or other cause for inaccurate temperature readings.
• Away from equipment, appliances, or other sources of electrical interference.
• Easy access for wiring, viewing, and adjusting the display screen.
• Approximately 5 feet (1.5 m) off the finished floor.
• The maximum length of wire is 500 feet (150 m).
• Strip wire to 3/8” (10 mm) for all terminal connections.
• Use standard 4 conductor, 18 AWG wire.
Installation Location
------------------------------------------------------------------------
Materials Required ---------------------------------------------------------------------------
• 18 AWG LVT Solid Wire
(Low Voltage Connections)
Removing The Thermostat Base
To remove the thermostat base:
• Locate the tab on the bottom of the
thermostat.
• Push the tab with either your thumb or
with a screwdriver.
• Lift the thermostat front away from the
thermostat’s base.

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Mounting The Thermostat
Wall
Thermostat
Front
Thermostat
Base
If mounting directly to the wall:
• Drill holes and install the wall anchors.
• Feed the wiring through the large hole in the thermostat base.
• Fasten the thermostat base to the wall using the wood screws to the wall
anchors.
• Terminate wiring to the wiring strip.
• Push the thermostat front onto the thermostat base.
3 1/4”
(83 mm)
Stud
Gang
Box
Thermostat
Front
Thermostat
Base
Adapter Plate
5110012
If a single gang box is used:
• Adapter Plate 5110012 is required (sold separately).
• Feed the wiring through the hole in the adaptor plate and the thermostat
base.
• Fasten the adaptor plate to the gang box.
• Fasten the base of the thermostat to the adaptor plate.
• Terminate wiring to the wiring strip.
• Push the thermostat front onto the thermostat base.

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Thick Floor Coverings (greater than 3/8” (10 mm))
If a thick floor covering is to be installed directly to the subfloor, a groove 1/8” (4
mm) wide by 1/16” (2 mm) deep can be cut into the back of the flooring material to
accommodate the wire for the sensor. Ensure that the sensor is located in such a
position that the attached wire is able to reach to a suitable junction location.
Splices under the floor covering should be avoided
to ensure trouble free operation. A groove 3/16”
(5 mm) wide by 3/16” (5 mm) deep by 1-3/4” (45
mm) long should be cut to accommodate the
sensor. The sensor should be located mid way
between the heating elements to ensure a proper
temperature reading.
NOTE: If it is not practical to cut a groove in the
surface covering, follow the installation method
used for thin floor coverings.
Slab Sensor 5110079 Installation
Thin-Set or Thin-Pour Applications
If the floor covering is to be installed over either a thin-set or thin-pour material of
sufficient depth, the 5110079 slab sensor can be placed directly into either the
thin-set material or the thin-pour material
and covered over. Ensure that the sensor is
located in such a position that the attached
wire is able to reach to a suitable junction
location. Splices within the thin-set or thin-
pour should be avoided to ensure trouble free
operation. The sensor should be located mid
way between the heating elements to ensure
a proper temperature reading.
Tiles
Thin-set
Electric
Cables
Thin Floor Coverings (less than 3/8” (10 mm))
If a thin floor covering is to be installed directly to the subfloor, a groove 1/8” (4
mm) wide by 1/16” (2 mm) deep can be cut into the surface of the subfloor to
accommodate the wire for the sensor. Ensure that the sensor is located in such
a position that the attached wire is able to
reach to a suitable junction location. Splices
under the floor covering should be avoided to
ensure trouble free operation. A groove 3/16”
(5 mm) wide by 3/16” (5 mm) deep by 1-3/4”
(45 mm) long should be cut to accommodate
the sensor. The sensor should be located mid
way between the heating elements to ensure
a proper temperature reading.
Hardwood
Subfloor
Hardwood
Subfloor
New Installations -----------------------------------------------------------------------------

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Tile Floor Coverings
If a Slab Sensor 5110079 is to be installed into an existing tile floor with sufficiently
large grout lines, the sensor and wire can be installed in one of the grout lines between
the tiles. Select a low traffic area of the floor that is mid way between the heating
elements for the sensor location. Ensure that
the sensor is located in such a position that
the attached wire is able to reach to a suitable
junction location. Splices within the grout should
be avoided to ensure trouble free operation.
Remove the appropriate grout line and place the
sensor and wire in the floor. Re-grout the area.
Installing the Sensor to the Bottom of a Subfloor
If the sensor is to be installed to the bottom of a subfloor, cut a piece of 1” (25
mm) thick rigid insulation into a 6” (150 mm) by 6”
(150 mm) square. A groove 3/16” (5 mm) wide by
3/16” (5 mm) deep by 1-3/4” (45 mm) long should be
cut into the insulation to accommodate the sensor.
Place the sensor in the groove and sandwich the
sensor between the insulation and the subfloor. Use
a suitable fastening method to affix the insulation
to the subfloor.
Tiles
Thin-set
Subfloor
Subfloor
Retrofit Installations ------------------------------------------------------------------------
Caution: Do not run sensor wires parallel to telephone or power cables. If the sensor
wires are located in an area with strong sources of electromagnetic interference,
shielded cable or twisted pair should be used or the wires can be run in a grounded
metal conduit.
The Slab Sensor 5110079 is supplied with 10’ (3 m) of cable. If a longer length
is required, 24 AWG or larger wire can be spliced onto the two wires from the
sensor. The splices should be properly soldered and protected in an accessible
junction box. Follow the sensor testing instructions given in this brochure and
then connect the wires to the control.
Slab Sensor 5110079 Wiring

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Slab Sensor 5110079 Testing
A good quality test meter capable of measuring up to 5,000 kΩ (1 kΩ = 1000Ω) is
required to measure the sensor resistance. In addition to this, the actual temperature
must be measured with either a good quality digital thermometer, or if a thermometer
is not available, a second sensor can be placed alongside the one to be tested and
the readings compared.
First measure the room temperature using the thermometer. Disconnect the Sen and
Com wires from the thermostat. Using an electrical meter, measure the resistance
of the Sen and Com wires at the thermostat location. Using the temperature versus
resistance table, estimate the temperature measured by the sensor. The sensor
measurement and thermometer readings should be close. If the test meter reads
a very high resistance, there may be a broken wire, a poor wiring connection or a
defective sensor. If the resistance is very low, the wiring may be shorted, there may
be moisture in the sensor or the sensor may be defective. To test for a defective
sensor, measure the resistance directly at the sensor location. Once the test has
been completed, reconnect the Sen and Com wires to the thermostat.
Do not apply voltage to the temperature sensor terminals at any time as damage to
the sensor may result.
Temperature vs. Resistance Table
Temperature Resistance
°F °C
-50 -46 490,813
-45 -43 405,710
-40 -40 336,606
-35 -37 280,279
-30 -34 234,196
-25 -32 196,358
-20 -29 165,180
-15 -26 139,402
-10 -23 118,018
-5 -21 100,221
0-18 85,362
5-15 72,918
10 -12 62,465
15 -9 53,658
20 -7 46,218
Temperature Resistance
°F °C
25 -4 39,913
30 -1 34,558
35 2 29,996
40 4 26,099
45 7 22,763
50 10 19,900
55 13 17,436
60 16 15,311
65 18 13,474
70 21 11,883
75 24 10,501
80 27 9,299
85 29 8,250
90 32 7,334
95 35 6,532

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Temperature vs. Resistance Table - Continued
Temperature Resistance
°F °C
100 38 5,828
105 41 5,210
110 43 4,665
115 46 4,184
120 49 3,760
125 52 3,383
130 54 3,050
135 57 2,754
140 60 2,490
145 63 2,255
150 66 2,045
155 68 1,857
160 71 1,689
Temperature Resistance
°F °C
165 74 1,538
170 77 1,403
175 79 1,281
180 82 1,172
185 85 1,073
190 88 983
195 91 903
200 93 829
205 96 763
210 99 703
215 102 648
220 104 598
225 107 553

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Thermostat Wiring
Zone Valve --------------------------------------------------------------------------------------
C
518 RRh W1 S1 Com
No Power
C
519 RRh W1 S1
Com
No Power
Zone
Valve
24 V (ac)
Transformer
L N
R C
Slab Sensor 5110079
N
Relay ---------------------------------------------------------------------------------------------
C
518 RRh W1 S1 Com
No Power
RC
2
1
8
7
3
4
5
6
C
519 RRh W1 S1
Com
No Power
LG
115 V (ac)
Slab Sensor 5110079
Relay
Transformer
Install field
jumper wire
R to Rh
Install field
jumper wire
R to Rh

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Switching Relay -------------------------------------------------------------------------------
Testing the Thermostat Wiring
Testing the Power ----------------------------------------------------------------------------
If the thermostat display turns on, this indicates that the thermostat is operating correctly
and there are no electrical issues. In the event that the display is permanently off:
1. Remove the thermostat front.
2. Use an electrical meter to measure voltage between the R and C wiring terminals.
For AC power supplies the voltage should measure between 10 to 30 V (ac). For
DC power supplies the voltage should measure between 10 to 30 V (dc).
3. If the voltage on the R and C wire terminations is continuous and the thermostat
display is not on, the thermostat may have a fault. Contact your MrPEX Systems
sales representative for assistance.
If the thermostat display intially powers on but later shuts off intermittantly, there
may be a short circuit from the W wire to ground, or the power supply is too small
to power the load.
Testing the Heat Zone Output Wiring --------------------------------------------------
1. Touch the button and set the heating temperature above the current room
temperature. Make sure the display does not flash “Max” if using a floor sensor.
2. When the “Heat On” symbol appears on the display, use an electrical meter to check
for voltage on the W and C wires connected to the zone valve, wiring center, relay
or switching relay. The electrical meter should read 10 to 30 V (ac) or (dc).
3. If the W and C wire have voltage, check the zone valve, wiring center, relay or pump
to determine if the heat device is operating correctly.
Thermostat Wiring
R W
24 V
R W
H NX X H N H N N H
Com Switching Relay
Zone 1 Zone 2 Zone 3
Class 2
Transformer
R W
Zone 1 Zone 2 Zone 3
C
518 RRh W1 S1 Com
No Power
C
519 RRh W1 S1
Com
No Power
Slab Sensor
5110079
LN
Pump

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HEAT ON
Heat is turned on.
MODE OFF
The heating system is off.
WARNING SYMBOL
Indicates an error is
present.
MIN
The floor is at or below the
floor minimum temperature.
MAX
The floor has reached the
floor maximum temperature.
Home Screen
Symbols Description
User Interface

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Heating Operation
Sequence of Operation
To change the heat temperature setting, push the or button to select a preferred
temperature setting. The Heat On symbol is shown on the display when the thermostat
is heating. The heat can cycle on and off within +/- 1.5°F (1°C) of the temperature setting.
The floor and air heating can be shut off by holding the button until Set Room is Off.
To resume heating when the Mode is Off, press the button to navigate to the Mode
setting, then press the button to select Mode Heat. The thermostat will resume
heating at the last previously set temperature.
Air Temperature Only ------------------------------------------------------------------------
If there is only an air temperature sensor (no floor sensor), the thermostat operates
to control your desired air temperature.
Floor Temperature Only ---------------------------------------------------------------------
If the air sensor has been disabled, the thermostat will only maintain floor temperature
and ignore air temperature. This operation is recommended for areas such as bathrooms
to ensure that tile floors are warm to the touch.
Floor and Air Temperature t ---------------------------------------------------------------
If the air sensor is turned on and a floor sensor is connected, the thermostat will
maintain the desired air temperature as well as a minimum floor temperature.
This operation is recommended for areas with large windows that allow the sun to
shine into a room and keep it warm without the need for heat. This can allow the floors
to cool off during the afternoon. When the sun goes down, it can take a long time for
the floors to get warm again. This may cause the room to cool off too much in the
early evening. A floor minimum setting can help with this condition by maintaining a
floor minimum temperature. Keep in mind the floor minimum temperature will override
the air temperature, and if set too high, may overheat the room.
This operation is also recommended for rooms with hardwood floors. Setting floor
minimum and maximum temperatures is a way of enhancing the comfort of the living
space while protecting floor coverings.
90°F (32°C)
Feels hot to the touch
80 to 85°F (26 to 30°C)
Feels warm to the touch
70°F (21°C)
Feels cool to the touch
40 to 45°F (5 to 7°C)
Feels cold to the touch
Suggested maximum for all floor
types other than wood.
Bathrooms and kitchens. Suggested
maximum for wood floors.
Rooms with large windows preventing
under heating in the evening.
Freeze protection for garages.

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Programmable Settings
Setting Display
User settings. Press the
and buttons together for 3 seconds to enter and
advance to the next setting.
MODE
Select heat or off.
Range: HEAT, OFF Default: HEAT
UNITS
Select the temperature units.
Range: °F or °C Default: °F
LIGHT
Select when the display back light should operate. Auto
operates the backlight for 30 seconds after a keystroke.
Range: OFF, AUTO, ON Default: AUTO
SET FLOOR
Set the floor minimum temperature. Available when an
auxiliary floor sensor is connected and the built-in room
sensor is on.
F
Range: OFF, 40 to 122°F (4.5 to 50.0°C) Default: 72°F (22.0°C)
TYPE
Device Type number. Hold the
button to view the
software version.
ESCAPE
Release the
and buttons to return to the home
screen.
Installer settings. Press the and buttons together for 5 more seconds.
AUXILIARY SENSOR
Select the type of auxiliary sensor. Available when an
auxiliary sensor is automatically detected.
Range: NONE = no auxiliary sensor, ROOM = Indoor
Sensor, FLOR = Slab Sensor, OUT = Outdoor Sensor
Default: OFF
ROOM SENSOR
Select if the built-in room temperature sensor is on or
off. The built-in room sensor can only be disabled when
an auxiliary room or slab sensor is connected. Room
Range: ON or OFF Default: ON
SET FLOOR MAXIMUM
Set the floor maximum temperature in order to protect
the floor covering. Suggested settings: Tile = 90°F
(32°C), Wood Floor = 85°F (29°C)
F
MAX
Range: 40 to 122°F (4.5 to 50.0°C), OFF Default: 85°F (29.5°C)
ESCAPE
Release the
and buttons to return to the home
screen.

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Error Message Description
SETUP MENU SAVE ERROR
The thermostat failed to read the Programmable Settings from memory
and has reloaded the factory default settings. The thermostat stops
normal operation until all Programmable Settings are checked except
to provide freeze protection.
Room
ROOM SENSOR OPEN CIRCUIT ERROR
The built-in air temperature sensor has an open circuit fault. Do not
confuse this error with the auxiliary room sensor short circuit error.
This error cannot be field repaired. Contact your wholesaler or MrPEX
Systems sales representative for details on repair procedures.
Room
ROOM SENSOR SHORT CIRCUIT ERROR
The built-in air temperature sensor has a short circuit fault. Do not
confuse this error with the auxiliary room sensor short circuit error.
This error cannot be field repaired. Contact your wholesaler or MrPEX
Systems sales representative for details on repair procedures.
AUXILIARY SENSOR OPEN CIRCUIT ERROR
The auxiliary sensor has an open circuit. Check for loose or damaged
wires. Locate and repair the problem as described in the Sensor
Testing section of this brochure. The error clears after the auxiliary
sensor fault is corrected. If the auxiliary sensor was intentionally
removed, power the thermostat down and up to clear the error.
AUXILIARY SENSOR SHORT CIRCUIT ERROR
The auxiliary sensor has a short circuit. Check for damaged wires.
Locate and repair the problem as described in the Sensor Testing
section of this brochure. The error clears after the auxiliary sensor
fault is corrected.
Troubleshooting
Error Messages

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Technical Data
Radiant Thermostat 5110519 One Stage Heat
Literature 5110519_C, 5110519_D, 5110519_Q, 5110519_U
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 0.6 lb. (290 g)
Dimensions 3-11/16” H x 3” W x 15/16” D (94 x 76 x 24 mm)
Enclosure White PVC plastic, NEMA Type 1
Approvals Meets Class B: ICES & FCC Part 15
Ambient conditions
Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing
Power supply 10 to 30 V (ac/dc), 50/60 Hz, 1.8 VA standby,
56 VA max fully loaded, Class 2
Relay 30 V (ac/dc) 2 A, Class 2 circuits
Sensor NTC thermistor, 10 kΩ@ 77°F (25°C ±0.2°C) ß=3892
– Included Slab Sensor 5110079
– Optional tekmar type # 070, 072, 073, 076, 077, 079, 084
Frequently Asked Questions
Symptom Look for... Corrective Action
Display powering
on and off.
Measure voltage at
wiring terminals R
and C.
The power supply transformer
may have limited VA capacity. A
transformer with a larger VA rating
is recommended.
Thermostat does
not heat. Mode Off Thermostat must be in Mode Heat in
order to provide heating.
Slab Sensor 5110079 10’ (3 m) wire
Dimensions 3/16” OD x 1-1/2” (5 OD x 38 mm)
Enclosure
316 stainless steel, 10’ (3 m) 24 AWG, 300 volt PVC insulated
Zipcord
Approvals CSA C US
Operating range -58 to 140°F (-50 to 60°C)
Sensor NTC thermistor, 10 kΩ@ 77°F (25°C ±0.2°C) ß=3892

519_D - 04/17
All specifications are subject
to change without notice
LIMITED WARRANTYEFFECTIVE MAY 1, 2016
VALID FOR MRPEX® POTABLE PEXA TUBING, FITTINGS AND OTHER SELECT
PLUMBING PRODUCTS
Limited Warranty
tMrPEX®Systems warrants to its “clients” that the MrPEX®POTABLE PEX-a Tubing and Plumbing Components, used for Plumbing
applications, sold hereunder shall be free from defects in material and workmanship and that the components will conform to
specifications stated in MrPEX®Publications. This Limited Warranty shall expire thirty (30) years for the MrPEX®POTABLE
PEX-a tubing, five (5) years for Lead Free Brass F1807 PEX Press Fittings, PPSU F2159 PEX Press Fittings and two (2) years for all
other components, from date of shipment by MrPEX®Systems unless otherwise specified in writing. MrPEX®Systems further
warrants that products listed are compatible with Each other, but at the same time we disclaim warranty for claims related to
compatibility with non-MrPEX®products. Components sold under this Limited Warranty must (1) be selected, designed, and
installed according to the instructions in MrPEX®Publications using appropriate trade workmanship and according to the local
building code(s), (2) remain in their originally installed location, (3) are connected to appropriate water and power supplies, (4)
show no evidence of tampering, mishandling, neglect, accidental damage, modification or repair without the approval of MrPEX®
Systems or damage done to the product by anyone other than MrPEX®Systems authorized personnel. A ten (10) year system
warranty shall be oered when a potable water system is installed solely with MrPEX®Systems tubing, fittings, and components.
MrPEX®Systems’ sole obligation hereunder shall be, at its option, to issue credit, repair or replace any component or part thereof
which is proved to be other than as warranted. No allowance shall be made to clients for transportation or labor charges unless
such charges are authorized in writing in advance by MrPEX®Systems. Any repairs without the express written consent of
MrPEX®Systems, shall render this Limited Warranty invalid. Warranty claims must be received by MrPEX®Systems within the
applicable warranty period and within thirty (30) days from the time when the cause for the claim occurred or was discovered.
Upon receipt of prompt notice of a warranty claim, MrPEX®Systems shall have ten (10) business days in which to determine
whether it acknowledges responsibility for any asserted defects in material or workmanship and the appropriate action to be taken.
This Limited Warranty and any claims arising from breach of warranty, or any other claim arising hereunder, shall be governed
and construed under the laws of the State of Minnesota. No other persons than MrPEX®employees have any express or implied
authority to bind MrPEX®to any agreement or warranty of any kind without the express written consent of MrPEX®Systems.
Disclaimer of Warranties
MrPEX®Systems disclaims any warranty not provided herein including the implied warranty of merchantability and
implied warranty of fitness for a particular purpose. It is expressly understood that MrPEX®Systems is not responsible for
any consequential or other damages that may arise from using MrPEX®System components. Damage resulting from water
freezing in the tubing does not constitute a defect in material or workmanship, and shall not be covered by this warranty.
MrPEX®tubing may not be stored in direct sunlight for any period longer than three weeks or this limited warranty
becomes invalid. Also, exposure to direct or considerable indirect sunlight after installation voids this limited warranty.
MrPEX®Systems disclaims any statutory or implied warranty of habitability. MrPEX®Systems further disclaims any
responsibility for losses, expenses, inconveniences, special, indirect, secondary, incidental or consequential damages arising
from ownership or use of the articles sold hereunder. There are no warranties which extend beyond the face hereof.