Maritime Geothermal nordic dx-45, Руководство по установке

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Maritime Geothermal Ltd. 12-Feb-00
“DX” systems can be installed in a more confined area
than a conventional groundloop system, primarily because the
heat exchanger coil is much more efficient at transferring heat
to the refrigerant than a plastic earth exchanger. Normal loop
lengths for a “DX” machine are nominally 350 ft. per ton as
opposed to 450 to 500 ft. per ton for a plastic earth exchanger.
Similarily, vertical systems require only a 3” borehole to a
normal depth of 100 ft. per ton.
Easier to sell
Systems can be quoted more accurately and easily since
there is less outside subcontracting involved.
Excavation or drilling contractors know in advance what
is required and can quote definite prices whereas with well
drilling for open loop systems, the well price may eliminate
the sale entirely.
NORDIC® DX Heat
Pump Installation
Instructions
Unpacking
When the heat pump reaches it's destination it should be
unpacked to determine if any damage has occurred during
shipment. Any visible damage should be noted on the carrier's
freight bill and a suitable claim filed at once.
The heat pump is strongly constructed and every effort has
been made to insure that it will arrive intact, however, it is in
the customer's best interest to examine the unit thoroughly
when it arrives.
Optimum Placement
The NORDIC® heat pump has an air-filter rack which can
be removed for easy entry through a doorway or to facilitate
moving the unit with a furniture cart. Simply remove the two
screws which hold the end cap in place, slide the cap off and
push the rack back off it's rails. When the heat pump is in
place the filter rack can be reinstalled with the removable end
(where the filter is removed) facing the direction that allows
easiest access for changing the filter.
To achieve the greatest efficiency, the heat pump should
be centrally located in the home with respect to the condi-
tioned space. This design provides the utmost in economy and
comfort and usually can be accomplished in harmony with the
design of the home. A heating system cannot be expected to
produce an even warmth throughout the household when it is
located at one end of the structure and the warm air is trans-
mitted with uninsulated metal ductwork.
If possible the three main service doors should remain
clear of obstruction for a distance of (2) two ft. so that servic-
ing and general maintenance can be carried out with a mini-
mum of difficulty. Raising the heat pump off the floor a few
inches is generally a good practice since this will prevent un-
necessary rusting of the bottom panel of the unit.
We recommend that the heat pump be placed on a piece of
2" styrofoam covered with 1/4" plywood. The styrofoam will
smooth out any irregularities in the cement floor while the
plywood will distribute the weight of the NORDIC® 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 2" x 4" lumber can be
placed under the unit running from the electrical connection
side to the filter rack side of the heat pump. Laying the 2" x
4"'s in this manner will give the best support since they will
be at right angles with the internal steel compressor and heat
exchanger supports.
Materials supplied by NORDIC®
NORDIC® supplies the DX heat pump with all internal
valving and headering preassembled, pressure tested and
ready to be installed to the customers duct system and under-
ground copper exchanger loops. The underground coil assem-
blies are also supplied pretested and sealed with 100 psig. ni-
trogen pressure. A DX system may comprise from 2 to 5 un-
derground loops. One loop is required for each nominal "ton"
of compressor capacity. The standard loops are 1/2" OD type
“L” or “K” copper tubing. When the dealer unpacks the coils
the integrity of the loops can easily be checked by attaching a
suitable pressure gauge to the 1/4" schrader valve on the coil
assembly. The pressure read at room temperature should be
approx. 100 psig. (+- 5 psig.) If a loop is not within this toler-
ance, it should be set aside for retesting or returned to NOR-
DIC® for replacement. Under no circumstances should a cop-
per groundloop be used if there is any question that it may not
be pressure tight.
The DX heat pump unit has been high pressure tested for
leaks and has a holding charge of 30 psig. (nitrogen) when the
dealer receives it.
Materials you will need (inside)
A lineset is required to connect the heat pump to the un-
derground coils which will be installed outside the structure.
This lineset consists of one 3/8" liquid line and one 1/2" gas
line for each "ton" or loop installed. The dealer will be re-
quired to silver braze (5% silfos) the required indoor linesets
from the point of entry to the basement or installation area to
the heat pump.