Maritime Geothermal NORDIC User manual

Maritime Geothermal Ltd.
P.O. Box 413
Petitcodiac, N.B. E0A 2H0
Maritime
Geothermal Ltd.
NORDIC® models EM (DX) 45-55-65
Direct Expansion
Energy Module Heat Pumps
Refrigerant Filled Copper Heat Exchanger Loop
Hot Water Output
Heat Pump System Requirements ..... 3Safety Controls ………... 14 Trouble Shooting Guide .......... 21
Conceptual Overview ……… 5Starting the Heat Pump ……. 15 Performance Curves ……….. 24
Technology Explanation …….. 7Component Layout ................ 17 Setting the Aquastat ……….. 27
Installing DX linesets .................. 11 Dimensions & Piping Layout 19 Electrical Schematic ..........………. 29
Inside Installation …………………. 12 EM Internal Schematic 20 Electric Block Diagram …... 30
Domestic Hot Water ........................... 13 Min. Circuit Ampacity 20 Warranty ............................………. 31
Table of Contents
Installation
Manual
Revision 1.5 17-Feb-00
Email: [email protected]
www.discribe.ca/nordic

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Maritime Geothermal Ltd.17-Feb-00
A NORDIC® Direct Expansion 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 Module
HEATING COOLING
Infloor Heating
Fan Coil
Ducted
Systems

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Maritime Geothermal Ltd. 17-Feb-00
Horizontal Loop Fields
The successful
application of a
EMDX heat pump
depends on sizing
the machine cor-
rectly for the
home or area to
condition and pro-
viding enough
land area or vol-
ume of earth from
which to extract or
reject heat.
EMDX heat
pumps react with
the earth much
like a conven-
tional reversing
heat pump and closed loop plastic earth heat exchanger.
Heat that is available to the unit must travel through the earth
and therefore the conduction capability of the earth in the lo-
cation of the heat exchanger is very important. A unit used
primarily for heating will have no problem with conduction
and heat transfer since it will be cooling the loop during heat-
ing mode. Cooling the soil draws moisture towards the coils
since they are colder than the surrounding ground. Horizontal
loop fields should be laid out so that the copper coils have
good cross-sectional influence on the minimum areas listed in
Table 1. As a general rule, wider spacing between the loops
so that they do not influence one another, will result in im-
proved performance of the heat 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 conditioning purposes.
Vertical Bore Systems
Vertical bores (76 mm x 30 m holes) provide an alter-
nate method of installing a EMDX unit. A high water table in
the borehole area (6 to 9 m) will insure that there is adequate
conduction with the earth and although the loop length per ton
is shorter than the horizontal design, the vertical orientation
and moisture in the boreholes provides very uniform conduc-
tion both winter and summer.
NORDIC® EM (DX) System Prerequisites
There are four specific parts or sub-systems to a EMDX heat pump installation:
1. The source of energy ............................................................... Solar & Geothermal
2. The storage media ................................................................... The Earth’s mass
3. Converting the energy to a useable form ................................... Heat Pump
4. Distributing the heat ..................................................................Hot Water / radiant slab –fan coils
Model # of
Loops Area Req’d Trench Layout
EMDX-45 (3) x 106 750 m² 1.3 x 53 m
EMDX-55 (4) x 106 930 m² 1.3 x 53 m
EMDX-65 (5) x 106 1160 m² 1.3 x 53 m
Note: These are minimum loop field requirements
based on an earth temperature of 7° C.
Table 1
Nordic® EMDX-45 will heat up to 140 m²
Nordic® EMDX-55 will heat up to 200 m²
Nordic® EMDX-65 will heat up to 260 m²
Assuming at least R-20 walls and R-40 ceiling

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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

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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.