purmo TM3 Underfloor Heating Shunt User Manual

purmo TM3 Underfloor Heating Shunt

Thank you for purchasing this product. Carefully read this manual which contains the specifications and all the information useful for the correct use. The information contained in this publication may be subject to change at any time and without any prior notice for technical and/or commercial reasons as they arise; therefore, we cannot be held responsible for any errors or omissions contained herein.

Warning! Please keep this manual in a dry safe place.

DESCRIPTION

Construction

1. No. 1 mixing valve with M30x1.5 thread designed for the installation of a thermostatic head with an immersion probe from 20 to 65°C or an electric servomotor (not supplied);
2. Nr. 1 calibration valve and by-pass;
3. Nr. 1 ½” manual air vent valve;
4. Nr. 1 thermostatic head with immersion probe setting from 20 to 65 °C limited to 50 °C;
5. Nr. 1 non-return valve;
6. Nr. 1 thermometer 0 – 80 °C scale;
7. Nr. 1 housing for flow temperature probe;
8. Nr. 1 housing for safety thermostat probe;
9. Nr. 1 electronic circulator GRUNDFOS UPM3 Auto with three -pole cable L 1000 mm;
10. Nr. 1 ball valve set (not supplied); k Nr. 2 G1 M-F excenters l Nr. 1 additional connection to realize 25mm offset between

DESCRIPTION

Technical data

• Primary circuit maximum temperature : 90 °C
• Maximum pressure : 10 bar
• Primary circuit max ΔP: 1 bar
• Secondary control range : (thermostatic regulation) 20÷65 °C
• Heating capacity that can be exchanged (ΔT 7°C, ΔP available 0.25 bar)
• Thermostatic regulation 10 kW by-pass pos. 0
• Thermostatic regulation 12.5 kW by-pass pos. 5
• Mixing valve pressure drops Kv 3
• Pressure drops with open bypass valve Kvmax 4.8
• Thermometer scale : 0÷80 °C
• Mixing unit inlet threads : G 1” F
• Connections Thread : G 1” M
• Circulator connections : pipe union 1”1/2 – takeoffs 130 mm

Hydraulic diagram of thermostatic regulation units and electronic circulator

INSTALLATION AND TESTING

Installing the unit
The mixing unit can be installed directly on the wall connected to distribution manifold or fixed by means of suitable plugs and screws (depending on the kind of wall) to be applied in correspondence of the holes to be drilled on bodies constituting the unit. The unit can also be installed in a metal cabinet if it is connected to the distribution manifolds, in this case provide a minimum depth of 120 mm.

Installation of thermostatic head with immersion probe for fixed regulation immersion probe for thermostatic regulation
To make it easier to assemble, set the maximum value on the thermostatic head. Bear in mind you need to set it back to the temperature required in the project for the floor-mounted system. Then insert the probe in the pocket

Limitation of the maximum temperature

1. Remove the red pin
2. Set the desired maximum temperature.
3. Locate the black dot printed between the temperatures 70 and 20 ° C.
4. Insert the pin in the first slot which precedes the black dot. After successful operation, the knob can not be positioned on higher temperatures than set.

Testing and filling

• Carry out the hydraulic test on the unit, close the valves and the lockshields on the distribution manifold.
• At the end of the test, reduce the pressure inside manifolds using the drain valves.
• Now fill each circuit individually by opening the valve and lockshield of the single way until all the air comes out.
• Correctly fill: connect the water supply to the drain valve in the flow manifold on the top and a tube to the drain valve in the return collector. Inside the mixing unit there is a check valve which prevents backflow circulation inside the unit, thereby making it easier to expel the air inside the circuits

BALANCING AND SETTING THE SYSTEM

Dimensional example

Thermostatic regulation
Project data:

• P = capacity to provide to the floor-mounted system = 6000W
• Tip = delivery temperature of the floor system = 40°C
• Tc = temperature of the water coming from the boiler = 70°C
• ΔTip = project temperature drop of the floor-mounted system = 5°C
• Tr = floor-mounted system return temperature = Tip –ΔTip = 40 – 5 = 35°C
• Qip = floor-mounted system flow-rate = (P[W] x 0,86) / (ΔTip) = (6000 x 0,86) / 5 = 1032 l/h
• ΔP valv = control valve pressure drop

From the diagram underneath the 1032 l/h flow rate, there are 6 different curves that correspond to the various bypass adjustments (ref. 2 fig. A): the less the bypass opens, the shorter the response time of the mixing valve to the temperature variations and the requested delivery temperature is reached in a shorter amount of time. Conversely, the opening of the bypass reduces the drops by increasing the system’s flow-rate and simultaneously reducing the flow temperature oscillations due to the opening-closure of the various areas the heating system is divided into.

Grundfos UPM3 Auto 25-70

Pump curve

• Setting/Inställning Max. head nom
• Curve/Kurva 1 5 m
• Curve/Kurva 2 6 m
• Curve/Kurva 3 7 m
• Setting Max. P 1 nom
• Curve /Kurva 1 33 W
• Curve /Kurva 2 39 W
• Curve/ Kurva 3 52 W

Performance curve

• Description
• Constant Curve
• Proportional Pressure
• Constant Pressure

Pressure drop in mixing units

By setting the bypass to 1, a 1032 l/h flow rate corresponds to a 90 mbar pressure drop (0.09 bar). Assuming that ΔP pav = floor-mounted system pressure drop = 0.25 bar, set the capacity of the GRUNDFOS circulator in order to sure a flow rate of 1032 l/h (1.03 m3/h) and a head H = ΔP valv + ΔPpav = 0.09 + 0.25 = 0.34 bar (≅ 3,4 MWC)

Below tables that show the data for systems selected based on the requested heating capacity. Therefore, first use the table or formulas to carry out the setting and then use the thermometers to make sure the project temperatures of the fluid are actually reached. To increase the ΔT of the floor circuits, just reduce the bypass flow rate.

ΔTip = 10 °C T Boiler/ Panna = 70 °C Tip = 45 °C ΔPip = 0,25 bar

Capacity (W)| Circulator setting| Bypass setting

---|---|---
20000| curves 3| 1-2
19000| curves 3| 1
18000| curves 2| 2-3
17000| curves 2| 1
16000| curves 2| 0-1
15000| curves 1| 2
14000| curves 1| 0-1
13000| curves 1| 0
12000| curves 1| 0

ΔTip = 5 °C T Boiler/ Panna = 70 °C Tip = 45 °C ΔPip = 0,25 bar

Adjusting the project temperature

Thermostatic regulation with thermostatic head
The water temperature of the floor-mounted system is set on the thermostatic head (ref. no. 4 Fig. A), which can be set to from 20 to 65°C. The head’s thermostatic element is connected to the immersion probe through a capillary.

Warning
The floor-mounted system can be heated up only after the screed’s curing (at least 28 days for cement screeds). Before laying the flooring, you need to start the system by setting the water temperature to 25°C for 3 days. Then, increase it by 5°C every 3 days, until you reach the desired temperature and keep this temperature for at least 4 days.

To set the desired temperature, proceed as follows:
Proceed as follows to set the required temperature

1. Turn the knob of the thermostatic head, setting the correct temperature.
2. Wait for the system to be fully activated and make sure the flow temperature and the temperature drop between the flow and return line of the floor-mounted system are in line with those reported in the project.
3. If necessary, proceed as follows to adjust the calibration bypass:
4. Excessively high temperature drop. Insufficient flow rate, gradually open the calibration by-pass valve until you reach the project’s temperature drop.
5. Delivery temperature below the set value. Gradually close the calibration bypass valve in order to create a differential pressure to inject the hot water coming from the boiler.

Activation – Troubleshooting

• The circuits of the floor-mounted system must be open.
• Any electrothermal heads must be set to the open position.
• Any overpressure valves must be calibrated in related to the features of the circulator

REPLACING THE COMPONENTS

Replacing the circulator

Proceed as follows to replace the circulator:

1. close the (ref. 1 fig. G) upstream and downstream ball valves (if any) of the mixing unit;
2. Empty the return manifold via the drain valve (rif. 2 fig. G);
3. power off the equipment;
4. loosen the pipe joints;
5. disconnect the power cable;
6. take out the circulator and replace it with the new one;
7. re-connect the circulator’s power cable by following the directions reported on the leaflet enclosed with the circulator itself;
8. tighten the pipe joints;
9. power on the equipment again and open the ball valves and lockshields/meters of the distribution collectors if installed.

Note If you are replacing the circulator, it is best to only replace the motor unit plus the impeller and leave the hydraulic body in place

Replacing the thermostatic head
Proceed as follows to replace the thermostatic head:

• take out the probe from the pocket;
• unscrew the thermostatic head and replace it;
• insert the probe in the pocket.

To make it easier to assemble, set the maximum value on the thermostatic head. Bear in mind you need to set it back to the temperature specified in the project for the underfloor heating.

GRUNDFOS CIRCULATOR

Warning
This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mentalcapabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.

Electrical Data

EU declaration of conformity

We, Grundfos, declare under our sole responsibility that the products GFNHH, GFNKL, GFNKJ, to which the declaration below relates, are in conformity with the Council Directives listed below on the approximation of the laws of the EU member states.

Low Voltage Directive (2014/35/EU) Standards used:

• EN 60335-1 :2012/A11:2014/A13:2017
• EN 60335-2-51 :2003/A1:2008/A2:2012
• EN62233 :2008

EMC Directive (2014/30/EU) Standards used:

• EN 55014-1 :2017
• EN 55014-2 :2015
• EN61000-3-2 :2014
• EN61000-3-3 :2013

INFORMATION NOTE WEEE DIRECTIVE APPLICATION Directive 2012/19 / EU

The crossed-out wheeled bin symbol on the equipment indicates that, at the end of their useful life, all electrical and electronic products within the European Union must be collected separately from other waste. Do not dispose of this equipment with mixed municipal waste. Assign the equipment to appropriate separate collection centresof electrical and electronic waste or return it to the dealer when purchasing new equipment of an equivalent type. Appropriate separate collection of the equipment for subsequent recycling, treatment and environmentally compatible disposal contributes to avoid possible negative effects on the environment and health due to the presence of dangerous substances in electrical and electronic equipment and resulting from an incorrect disposal or misuse of the same or parts thereof. Separate collection also favours recycling of the materials the equipment is made up of. Current legislation provides for sanctions in case of illegal disposal of the product.

Respect the environment!
For a correct disposal, the different materials must be divided and collected according to the regulations in force.

BAR CODE

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