Maritime Geothermal EM (DX) 45-55-65 Installation Manual Download Page 5

Page .... 5 

Maritime Geothermal Ltd. 

17-Feb-00 

Introduction to EMDX Technology 

 Direct earth coupled heat pump or “EMDX” heat pump is 

one that has its refrigerant evaporator /  condenser in direct 
thermal contact with the earth from which heat is either ex-
tracted 

from  

during the heating mode or introduced 

to 

during 

the cooling mode of operation. 

 

Energy Machine Overview 

 
As a result of direct urging from the engineering community, 
Maritime Geothermal Ltd. has developed a unique new heat 
pump solution specifically targeted at buildings which employ 
infloor heating as the primary energy distribution system in 
the building.  
 
The need for an integrated package liquid-to-water or DX®-
to-water heat pump became apparent as mechanical engineers 
who were designing the buildings found that the complexity 
of setting up a mechanical room with suitable heat pumps, 
circulator pumps, storage tanks, aquastats and other controls 
seemed to pose a confusing demand on the installation con-
tractors, plumbers and electricians.  
 
This complexity  usually required repeated consultations on 
site with the designing engineer and various tradesmen in-
volved in carrying out the heat pump installation and with 
companies involved in integration of the building manage-
ment system. 
 
To address this situation Maritime Geothermal Ltd. Designed 
the 

"Energy Machine" 

with all mechanical components re-

quired to mate successfully with an infloor heating system 
built into the heat pump enclosure. The plumber need only 
connect the supply and return to the floor header system and 
the electrician makes a single wiring connection to the unit 
for heat pump, circulator pumps and back-up electric heat.  
 
An 

Energy Machine 

includes the following components.: 

Compressor  

Earth heat exchanger or provision for DX connection to the 

ground.  

Insulated 40 gal. 316 SS distribution tank with integrated 

refrigerant condenser and domestic hot water generator.  

Expansion tank, PRV, Boiler feed valve, pressure gauge.  

Electronic 2-stage aquastat.  

12 kw back-up heat  

Floor distribution circulator pump (Standard Taco® 0011 or 

you spec head and volume).  

All controls prewired and ready to use.  

With a typical water-to-water HPmost of these components 
were outside the heat pump and had to be procured and in-
stalled by the plumber. 
 
 
 
 

 

Energy Machines are superior to a  
built-up system in the following ways: 

1. Installed first cost is cheaper. 
2. Building controls are simpler requiring less control 
points. 
3. Higher efficiency. 
4. Hotter output temperature. 
5. Year around domestic hot water capability. 
6. Fewer moving parts - less maintenance. 
7. Simple integration to an infloor heating system. 
8. Back-up heat built in. 
9. Stainless Steel storage tank. 
10. Accurate temperature regulation. 

 
1. Cost of purchasing the individual components and building 
the mechanicals on site are higher than purchasing an inte-
grated package such as the NORDIC® EM. 
 
2. Costs associated with the control points in a building man-
agement system are also reduced since the machine only has 
to be put in the "ON" or "OFF" mode requiring 1 point. The 
energy machine operates all its internal pumps and circulators 
automatically. 
 
3. Because the condenser of the heat pump is built into the 
distribution tank, there is no need for an intermediate water 
loop and associated pump system. This integration saves the 
first cost of the circulation pump and the costs of operating 
and maintenance on the pump over the years. 
 
4. The

 

maximum output water temperature can be up to 52°C 

(125°F) whereas a conventional water-to-water heat pump 
will normally have a maximum  output temperature of 46°C 
(115°F).  
 
5. A conventional heat pump can only supply hot water dur-
ing regular floor heating cycles unless there is an auxiliary 
heat exchanger installed.  The EM has a heat exchanger em-
bedded in the tank which can produce domestic hot water 
year around.  
 
6. The EMDX has fewer moving parts than a conventional 
heat pump and requires no servicing or maintenance of any 
kind. 
 
7. A two point  connection to the floor header system is all 
that is required. 
 
8. External back-up boiler or electric hot water tank is not re-
quired since the EM tank is equipped with 9-15 Kw of back 
up electric heat prewired and activated as the second stage of 
a 2-stage digital aquastat. 
 
9. The integrated storage tank is fabricated from type 316 
Stainless Steel which will last the life of the building. 
 
10. The EM is controlled with a digital 2 stage thermostat 
with individually adjustable setpoints and differentials. First 
and second stages will not overlap unless set to do so.  

Summary of Contents for EM (DX) 45-55-65

Page 1: ...e Shooting Guide 21 Conceptual Overview 5 Starting the Heat Pump 15 Performance Curves 24 Technology Explanation 7 Component Layout 17 Setting the Aquastat 27 Installing DX linesets 11 Dimensions Pipi...

Page 2: ...pansion Heat Pump System Energy Input Solar Geothermal Storage System Earth s Mass Extraction Rejection System EM heat pump Heat Distribution Infloor Heating Fan Coil Distribution NORDIC DX Energy Mod...

Page 3: ...pump Unless you are sure there will be sufficient moisture pre sent in the loop field area during the summer a soaker hose is recommended in all horizontal trench systems which will used for air condi...

Page 4: ...Page 4 Maritime Geothermal Ltd 17 Feb 00 NORDIC EMDX Series Typical Plumbing Domestic HOT Water Tank HOT Water OUT to home DX copper lines to outdoor loops Check Valve...

Page 5: ...ost of these components were outside the heat pump and had to be procured and in stalled by the plumber Energy Machines are superior to a built up system in the following ways 1 Installed first cost i...

Page 6: ...heat pump to approx 1 m down the drop pipes in the vertical boreholes Install spacers to keep the pipes separated as far as possible from one another in the boreholes Install 30 to 35 m of dual tubin...

Page 7: ...gerant re quired during the cooling operation but not needed during the heating mode 6 Inefficient and ineffective method to account for vastly varying condenser capability depending on ground tem per...

Page 8: ...Page 8 Maritime Geothermal Ltd 17 Feb 00 Piping Layout of Vertical Style DXW Vertical Loop HOME...

Page 9: ...ll distribute the weight of the NOR DIC unit evenly over the Styrofoam This process will also deaden the compressor noise emitted from the bottom of the cabinet As an alternative several pieces of 50...

Page 10: ...Page 10 Maritime Geothermal Ltd 17 Feb 00 NORDIC EMDX Horizontal Trench Design...

Page 11: ...un the pipe insulated up the outside wall making a 90 degree turn above ground and entering the dwelling between the floor joists just below the first floor These pipes should be insu lated with a min...

Page 12: ...Page 12 Maritime Geothermal Ltd 17 Feb 00 Horizontal EMDX Loop Field Plan View...

Page 13: ...ire system should be pressurized to 700 kPa with dry nitrogen and all joints made by the installer checked for leaks using soap suds or some other technique that the installer feels comfortable with I...

Page 14: ...e a excavated area or an existing area which needs to be filled as part of general excavation Loops should be buried approxi mately 2 m underground for best performance Example Nordic DX 45 should hav...

Page 15: ...lectrical panel 7 Have the following tools on hand and know how to use them A refrigeration gauge set An electronic or other accurate thermometer An amprobe 1 Connect your refrigeration gauge set 2 Tu...

Page 16: ...ses straight through the valve to ports G where it exits to the vapor line header From the vapor line header the refrigerant gas enters the reversing valve at point H and exits to the common suction l...

Page 17: ...in Hot Water In Expansion Tank Expansion Valves 40 Gal Stainless Distribution Tank Electric Heat Elements 3 x 3KW Ranco 2 stage Digital Aquastat EMDX Front Side Compressor Contactor Right Electric Hea...

Page 18: ...Page 18 Maritime Geothermal Ltd 17 Feb 00 NORDIC Series EMDX 45 55 65 HW Engineering and Performance Data Feb 00...

Page 19: ...Ltd 17 Feb 00 Maritime Geothermal Ltd Date Feb 1999 Revision 4 35 Color Caissie Grey EM Direct Expansion to Water Heat Pumps Models EMDX 45 65 Style Horizontal Drawn By G Kaye Title Piping Electrical...

Page 20: ...p Electrical Service Requirements Second row lists requirements with 9KW internal back up heat installed Model EMDX 45 HW EMDX 55 HW EMDX 65 HW Voltage 230 1 208 3 230 1 208 3 230 1 208 3 Min Circuit...

Page 21: ...eter shows no resistance be tween common and run terminals or between common and start terminals Note Be sure compressor overload has had a chance to reset If comp is hot this may take several hours D...

Page 22: ...erant level Refrigeration gauges show suction pressure dipping below 138 kPa Check refrigerant level Add refrig erant slowly Check for possible leaks Normal charge is 1 8 kg per ton Faulty low pressur...

Page 23: ...age or restriction in the water line or hot water heat exchanger Check water flow and power to pump Check water lines for obstruc tion Remove obstruction in water lines Acid treat the domestic hot wat...

Page 24: ...3296 3697 3 9 62 250 45 32607 100 107 6 10 45594 17 3 3178 3584 3 7 57 240 41 30635 100 107 3 10 43956 17 4 3129 3543 3 6 54 234 35 26674 100 106 3 10 38008 16 6 2963 3378 3 3 45 219 30 22677 100 106...

Page 25: ...108 9 10 53868 18 8 3943 3 4 356 4288 3 7 60 250 45 38208 100 108 3 10 49602 18 4 3764 3 4 329 4083 3 6 54 240 40 35795 100 107 8 10 46611 17 6 3594 3 5 338 3923 3 5 50 230 35 31942 100 107 1 10 4239...

Page 26: ...9 27 8 5721 4 2 413 6134 3 37 62 8 245 50 46511 100 111 2 10 67164 26 7 5428 4 1 414 5842 3 37 57 2 234 45 42117 100 110 4 10 62200 25 4 5173 4 1 415 5588 3 26 52 4 224 40 38521 100 109 7 10 58167 24...

Page 27: ...setting Step4 Press the SET key again to access the stage1 cooling or heating mode The LCD will display the current mode either C1 for cooling or H1 for heating Then press the UP or DOWN key to toggle...

Page 28: ...1 relay 24v Power Connection Stage 1 NC NO C Stage 2 NC C NO Cover screws 4 Mounting Holes Shown Below NOTE The temperature sensor can be extended up to 400 ft by cutting the sen sor extension cable...

Page 29: ...Page 29 Maritime Geothermal Ltd 17 Feb 00 NORDIC EMDX 45 55 65 HW Series Schematic 208v 3ph 60Hz Greyed Circled Items Optional...

Page 30: ...208v 3 60 Box Heating Domestic Hot Water Versions NOTE A Electric Heat Back up is An option which can be activated or deactivated by the customer by discon necting the breaker as re quired To disconne...

Page 31: ...a Sheet have it endorsed by the owner and return it to Maritime Geothermal Ltd within 21 days after the in stallation of the unit 3 It is the responsibility of the building or general contractor to su...

Page 32: ...Environmentally sound solutions to today s Heating and Cooling needs NORDIC NORDIC Maritime Geothermal Ltd has the solution for all your heating and cooling projects Vertical Liquid to Air Liquid to L...

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