Mixing Modules, Heat Exchangers andElectrical Hot Water Heaters

hydronic heatingFloor, Wall and Radiant

Compact design is ideal for retrofit installations or new constructionExcellent heat distribution due to integrated spherical motor pumpEasy to install and serviceLow cost systems

Application and DesignMixing module for the connection of floor heating surfaces with upto 400 Sq Ft for one and two-pipe systems. The MOH 1 consists ofmixing base unit, spherical motor pump with on/off-switch and 6foot power cord, pre-adjustable control valve, room temperatureguided control (see below), mounting bracket for left or right sidedconnection, over-temperature protection device (131° F), adjustablebypass for connection to one-pipe systems, and venting device.

With the MOH 1 mixing unit floor heating systems with up to2 loops and up to 400 Sq Ft can be easily directly connected to aboiler/radiator loop. The MOH 1 allows additionally for a roomtemperature guided control for a chosen reference room. Thesurface specification 400 Sq Ft applies to an inside diameter of thefloor heating pipe of ½” the maximum pipe length per heating circuitshould not exceed 861 Ft. For smaller pipe inside diameterscorresponding reductions must be made.The MOH 1 is designed for oxygen proof floor heating systems. Themounting bracket allows a left- or rightsided connection to the boiler/radiator circuit. Due to an integrated bypass the MOH 1 can bealso connected to the former used but now out-dated single-pipesystem. The model MOH 1 KF is specially suited for bath roomsand other humid areas due to the non electric thermostat withremote sensor.

The MOH 1 allows a reduction of the high supply temperature ofthe boiler/radiator circuit (for example 160° F) to the lowertemperature level required for the floor heating (for example 95 °F)by injecting hot water into the floor heating supply. The supplytemperature for the particular floor heating can be adjusted indirectlyby the flow through the control valve (model KF + RT) or directly byan integrated constant temperature control (model KR).

The integrated spherical motor pump ensures an even temperaturedistribution on the whole surface and a constant comfortabletemperature level in the floor heating area.

In addition, the MOH 1 is equipped with an integrated over-temperature protection device, which prevents a circulation of waterwith temperatures higher than 131° F through the floor heatingloops, thus preventing damage to the floor.

The room temperature control of the MOH 1 works as follows: Thecontrol valve is opened as long as the measured room temperatureis below the set level. This can happen in two ways: Thermostatdrive with remote sensor (model KF) or thermoelectric drive (modelRT + KR) The RT-KR drive must be connected to a room thermostat(ordered separately). A wireless radio control is also available onrequest.

Single zone mixing module

moh1

Advantages MOH 1Compact design is ideal for retrofit installationsExcellent heat distribution due to integrated spherical motor pumpSimple connection to existing heating system for floorheating systems up to 400 Sq FtNo limitation of the boiler-/radiator supply temperature, whichmeans, that old boiler systems with high supply temperatures upto 230°F can be connected to a floor heating system.Integrated over-temperature protection device (131° F).The floor heating supply temperature is controllable either byadjustment of the injected volume flow (model KF + RT) or directlyby setting the integrated constant temperature control(model KR).

Technical Data

Max. system pressure 150 PSIMax. system temperature 230° F (Radiator circuit)

131° F (Floor heating circuit)Max. differential pressure 15 PSI within radiator circuitSupply voltage 1 x 115 V / 60 HzPower consumption 33 Watt (pump)Dimensions L 10.4‘‘ x H 7.68‘‘ x D 3.54‘‘Distance Supply/Return 1.57‘‘ Radiator connection

2.32‘‘ mm Floor heating connectionWeight 5.06 lb (2,3 kg)

Pump curve

Dimensional drawing

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Design(e.g. MOH1 KF)

Thermostatic head

Adjustable mixing valve

Over-temperatureprotection system 131°F

Air vent

Remote sensor

Supply to floor heating loop

Return to boiler loop

Adjustable bypass

Return from floor heating loop

Laing spherical motor pumpwith on/off-switch

moh1 Accessories

Model Description

DXG Duplex connector (manifold with supply and return for 2 loops)

S-MOH 1 A White galvanized steel cabinet with mounting rails and mounting hardware included, one per carton.Dimensions: H 13” x W 12½” x D 4½” - 7”

S-MOH 1 B White galvanized steel cabinet incl. 2 mounting rails and mounting hardware included, one per carton.Dimensions H 12 x W 16 x D 4 1/3”

KF Remote sensor thermostat (50° - 79° F)

RT Thermoelectric drive for room thermostat connection

KR Thermoelectric drive, prewired with pump for constant temperature control (60° - 158°F)

moh1 Mixing units for single zone mixingMixing base unit (Eurocone connection 3/4") incl. spherical motor pump with on/off-switch and cord (6 ft), pre-adjustable control valve,mounting bracket for left- or right sided connection, over-temperature protection device (131° F), adjustable bypass for connection tosingle-pipe systems, air vent;

Model Description

MOH 1 KF Mixing unit for connection of floor heating systems up to 400 Sq Ft with room temperature guided control thermostat(50°-79°F+freeze protection) with capillary remote sensor (16 Ft).

MOH 1 RT Mixing unit for connection of floor heating systems up to 400 Sq Ft with room temperature guided control through athermoelectric drive for connection to a room thermostat (sold separately).

MOH 1KR Mixing unit for connection of floor heating systems up to 400 Sq Ft with integrated constant temperature control (68°-158° F)for connection to a room thermostat (sold separately).

Supply from boiler loop

Rotor/Impeller

Multi-zone mixing module

moh2

ApplicationsFloor heating, wall heating, snow melting

Design principleA low temperature heating system can be connected to a boilerloop using a mixing module. Control valves and circulators for thelow flow temperature loop are integrated into the mixing module.Completely pre-assembled substations are available with manifoldsin a cabinet or board mounted.

System advantagesThe MOH 2 is a low cost system used for systems with 2 to 12individual zones, up to 2400 Sq Ft. for use in oxygen-diffusion prooffloor heating systems with additional hydraulic adjustmentcapabilities. The compact, space saving design (recessed or wallmounted cabinets available) and the use of the reliable Laing sphericalmotor pump allow the system to be installed directly in the livingarea if needed. The result is a low cost, simple system that can beconnected directly to the boiler loop. A separate low temperatureloop from the boiler to the floor heating manifold is not necessary.The boiler manifolds and additional mixing valves are also eliminated.

Systems operationThe circulator circulates the water through the floor heating feedconnection and the floor heating loops to the floor heating returnconnectionWhen the mixing valve opens, boiler feed water is mixed to thefloor heating loop feed side and the same amount of water isreturned from the floor heating return side to the boiler loopreturn sideThe mixing valve adjusts the quantity of water coming from theboiler loop to control the desired floor heating loop feedtemperatureThe control valve is equipped with an adjustable knob which canregulate the amount of water from the boiler loop that is allowedto flow to the floor heating loop

Control unitsMOH2 mixing modules can be driven by a wide range of Laing controlunits. All are especially designed for use in floor and wall heatings.Constant, room or outside temperature guided controls are available.All Laing control units provide continuous and sensitive temperaturesettings, including a sophisticated technique to maximize comfort.They all come standard with over-temperature safety-protection toavoid overheat damages to the floorheating caused by electricalpower outage or defective valves. LED or LCD signals make themeasy to service.

Technical Data

Max. system pressure 150 PSIMax. system temperature 220° F (Radiator circuit)

140° F (Floor heating circuit)Max. differential pressure 15 PSI within radiator circuitSupply voltage 1 x 115 V / 60 HzPower consumption 65 Watt (pump)Dimensions L 7.8‘‘ x H 16.75‘‘ x D 3.94‘‘Connection Boiler loop: feed connection

3/4‘‘ female thread in ball valveFloor heating loop: feed connection1‘‘ female thread/flange forsegmented plastic manifold

Pump curve

Dimensional drawing(e.g. with 6 manifolds)

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moh2 Accessories

Model Description

VSVA Manifold segment for feed side with valve

VSRA Manifold Segment for return side with flow meter / preadjuster

moh2 Multi-zone mixing module

Model Description

MOH 2 Mixing unit with preadjustable control valve, circulator, adjustable bypass for boiler feed temperature guided control, fill valve,check valve, thermometer, automatic air vent, 1/2" female thread with plug for connection of temperature immersion sensorfor btu-meter; connection to the boiler on the left with ball valves (3/4" female thread), connection for floor heating manifoldon the right (1" female thread), corrosion resistant. Laing also offers a various range of control units;

Design

Laing spherical motor pump

Rotor / Impeller

Fill valve

Thermometer

Automatic air purger

Check valve forfilling of floorheating loops

Floor heatingfeed side

Floor heatingreturn side

Presetting knobfor control valve

Drain valve

Sensor position for floorheating feed temperature

Bypass valve

Boiler feed side

Boiler return side

Electrical hot water heating boilers

ehr, epr and epm

These units are compact electrically heated boilers with an integratedcirculator pump. Their performance ranges from 6 to 15 kW sufficientup to 2.400 Sq Ft, sufficient for the space heating of a single familyhome or an apartment. Due to their compactness and a depth ofonly 4.3’’ they can be mounted inside a wall or placed in a recess. Allcomponents are corrosion resistant. The use of the Laing sphericalmotor pump guarantees quiet operation over its lifetime. The integratedelectronic control enables noiseless switching of the electric heatingelements. A safety temperature limiter protects against overheating.

epr Electric apartment heaterEasy emergency heating during boiler malfunctions or replacement,also optimal for heating building sites and when installing underfloorheating. Mounted on a special, robust transport trolley, it is completelyready for connection on delivery. It consists of an electrical heaterwith 3 heating elements and power step switching (3+5+5=13 kW,sufficient up to 2040 Sq Ft), circulator, on-off thermostat (68-194°F),safety temperature limiter, pressurized expansion tank (6l), safetyvalve, pressure gauge, thermometer, union connection with ball valve1" female thread, fill valve, corrosion resistant, and power cord.

epm Mobile Emergency Heater

Small electric boilers with heat performance up to 2 kW sufficient upto 360 Sq Ft, mainly intended for the heating of a single room. It isespecially suitable for bathroom floor heating during the time of yearwhen the central heating system is shut off. Also for the heating ofroom additions or rooms in attics. Contains of heating element of2 kW, circulator, safety temperature limiter, and constant temperaturecontrol. Optional timers available. All components coming in contactwith the liquid are corrosion resistant. Also available assembled intoa cabinet with expansion tank, a manifold for 2 loops, and valves for filling.

ehr Electric single room heater

ApplicationsRadiant heating systems and surface heating systems, alsoapplicable as domestic hot water heating, supplemental heating forlow-energy houses, solar systems and heat pump systems, vacationand weekend homes. Electrical heating today is often less expensivethan other heat sources thanks to the reduced heating requirementsdue to improvements in insulation in new buildings, attractiveelectricity rates and non-existent start-up and stand-by losses.

AdvantagesLaing electrical heaters are characterized by low initial and installationcosts as well as low operation costs. No separate heating or storageroom is required. Due to the compact, space-saving design and theuse of the long-term quiet spherical motor pump, the electricalheating system even can be installed directly in the living area.Electrical heating systems have low maintenance costs as burnermaintenance and oil tank cleaning is not required. No chimney sweepcosts. No risk from gas or oil leakage. No fumes or smells.

Design principleLaing electrical heating units consist of an electrical heater withheating elements, a circulator, a safety temperature limiter, anelectronic constant temperature control unit with additionalfunctions, a pressurized expansion tank and a safety relief valveand pressure gauge. All components in contact with the liquid arecorrosion resistant. A manifold can also be attached. The electricalheating system is available on mounting rails or with cabinet. Acomprehensive range of control units is available for additional controlof the substations. Also applicable as mobile electrical heating, e.g.as emergency heating, temporary electrical heating during a boilerexchange and as construction site heating.

Heating loopfeed side

Heating loopreturn side

Spherical motor pump

Heatingelements

Electronic constanttemperature control

Safety valveand air vent

Design(e.g. Model EPR)

Manometer

Thermometer

Heat exchangers for system separation

fp

ApplicationsFloor heating, wall heating and outside surface heating.

AdvantagesMaximum system safety due to complete separation of the boilerloop from the floor heating loop, no corrosion due to oxygen diffusion,no accumulation of sludge, no clogging of copper pipe heat exchanger,limited water damage if floor heating loop is damaged. Considerablecost advantages for multi-story buildings due to hydraulic separationfrom static pressure of primary system.

The complexity and costs of establishing a hydronic heating installationcan be reduced significantly by using a Laing Heat Exchanger. Insteadof two different loops for the boiler and the floor heating loop, onesingle loop is sufficient for both systems. Since the silent heatexchanger can be installed right in the living area, this second lowtemperature loop from the boiler through the whole building to thefloor heating loop is unnecessary. The heat exchanger transportsthe heat from the boiler loop right into the floor heating loop withmaximum safety due to complete system separation. A floor heatingmixer (usually located close to the boiler) for the floor heating loop istherefore also not necessary.Due to complete system separation of the boiler loop from thecorrosion resistant floor heating loop, damages in the boiler loopcaused by oxygen from the floor heating loop diffusion is no longer aproblem. The complete system separation also eleminatesaccumulation of rust sludge in the floor heating loop, which extendsthe life of the surface heating system, and simplifies servicesignificantly.

Every heat exchanger can be set and controlled separately. Therefore,individual settings for every floor heating loop in accordance with thepreferences of the inhabitants are possible. This maximizes thecomfort and the sense of well-being. This system is also ideal andeasy to install for retrofit installations in apartment houses.

Design PrincipleA low temperature heating system (i.e. floor or wall heating) can beconnected to a boiler loop using a heat exchanger. Control valvesand circulators for the low temperature loop are integrated.Completely pre-assembled substations are available with manifoldsand expansion tanks in a flush-mounting cabinet or on mounting rails.The Laing Heat Exchanger FP is available with heat capacity of 12 or15 kW. A comprehensive range of control units is available for allsystems.

Design(e.g. Model FP 12)

Spherical motor pump

Copper pipe coilheat exchanger

Floor heatingloop feed side

Floor heatingloop returnside

Bolier loopreturn andfeed side

Manual air vents(primary side)

Safety valve

Pressure gauge

fp Heat exchangersHeat exchanger for the safe system separation of boiler and floor heating loop, heating capacity model FP 12 up to approx. 12 kW, suitable for floorarea up to approx. 1.800 Sq Ft, heating capacity model FP 15 up to 15 kW suitable for floor area up to approx. 2.400 Sq Ft. All come standard withintegrated circulator, control valve on the primary side, corrosion resistant, connection on the primary side R ¾" female thread, union fitting on thesecondary side with ball valve 1" female thread, adjustable bypass for boiler feed temperature guided control. Both models are available with pressurelessor pressurized expansion tank, in flush-mounting cabinet or on mounting rails. FP 15 is particularly suited for condensing boiler technology. A widerange of control units is available. Additional components like manifolds are also available.

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Laing Thermotech, Inc. · 830 Bay Blvd. Suite #101 · Chula Vista, CA 91911 · Phone: (619) 575-7466 Fax: (619) 575-2739 · E-Mail: technicalsupport@lainginc.com or customerservice@lainginc.com · www.lainginc.com