Maritime Geothermal ATF-45, Инструкция по установке и обслуживанию

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1-Jun-2018 Page 19 002000MAN-01
Indoor Loop Water Lines
The connections for the Indoor Loop circuit are 1”
brass FNPT. They are labelled as INDOOR IN and INDOOR
OUT. The ports are located on the front of the unit.
A typical 2 port buffer tank system is shown in drawing
001981PDG . This diagram shows all of the recommended
components as well as where they should be placed. A typical 4
port buffer tank system is shown in drawing 001046PDG . Un-
ions or some other form of disconnect should be used so that
the coaxial heat exchanger may be accessed should it require
cleaning.
NOTE: It is recommended that the water lines between the
heat pump and the buffer tank be copper or other high tempera-
ture piping.
NOTE: Care should be taken when routing the water lines to
ensure that adequate access to the heat pump is maintained so
as to not compromise ease of serviceability.
The minimum buffer tank size should follow the rule of 8
US gallons per ton of heat pump capacity. TABLE 11 shows the
minimum buffer tank size for each heat pump along with the
recommended size. The recommended size will minimize the
number of starts per hour and provide longer runtimes for im-
proved efficiency.
Piping
Domestic Hot Water
(Desuperheater) Connections
The port connections for the DHW circuit are 1/2” brass FPT
fittings. They are marked as DHW IN and DHW OUT.
A typical piping diagram for a pre-heat tank configuration
can be found in drawing 000970PDG at the end of this section.
Be sure to note the position of the check valve and the direction
of water flow. Other configurations are possible, and there may
be multiple units tied together in larger buildings.
Ensure the tank is filled with water and under pressure
before activating the built-in DHW circulator as described below.
First, slightly loosen the boiler drain on the DHW Out pipe to
allow air to escape from the system. This step will make certain
that the domestic hot water circulator in the unit is flooded with
water when it is started.
Activate the built-in DHW circulator by connecting the
brown wire with the blue insulated terminal to L1 of the com-
pressor contactor. Ensure the power is off when connecting the
wire. Once connected the DHW switch on the front of the
unit may be used to enable/disable the domestic hot water circu-
lator.
The DHW loop may have to be purged of air several times
before good circulation is obtained. A temperature difference
between the DHW In and DHW Out can be felt by hand when
the circulator pump is operating properly.
For the pre-heat tank setup, the final tank should be set to
140°F (60°C), which is required by most codes. The pre-
heat tank does not require electric elements. This setup takes
full advantage of the desuperheater as it is the sole heat provid-
er to the pre-heat tank. The desuperheater remains active dur-
ing the compressor runtime until the pre-heat tank has been
completely heated by the desuperheater alone. This setup is
more energy efficient than a single tank setup, and eliminates
the possibility of reverse heating of the refrigerant gas in cooling
mode.
WARNING: USE ONLY COPPER LINES TO
CONNECT THE DESUPERHEATER. TEM-
PERATURES COULD REACH 200F SHOULD
THE DHW CUTOUT SWITCH FAIL, POTEN-
TIALLY MELTING & RUPTURING PLASTIC
PIPING.
CAUTION: the domestic hot water pump is
water lubricated; damage will occur to the
pump if it is run dry for even a short period
of time.
CAUTION: If two (2) shut-off valves are
located on the domestic hot water ines as
shown in the diagram, a pressure relief valve
must be installed to prevent possible dam-
age to the domestic hot water circulator
pump should both valves be closed.
TABLE 11 - Buffer Tank Size
Heat Pump Size
Minimum Size
gallons (Litres)
Recommended Size
gallons (Litres)
45 24 (91) 50 (190)
55 32 (121) 70 (265)
65 40 (151) 70 (265)
75 48 (182) 70 (265)
If a tank size is not available, use the next size larger tank.
Condensate Drain
The unit comes equipped with one 3/4” female PVC socket
drain connection. This drain allows the condensate which forms
during the air-conditioning cycle to be removed from the unit.
The drain should be connected and vented as per local codes.
During high humidity weather, there could be as much as 25
gallons of water formed per day.
The condensate drain is internally trapped and does not
require an external trap. An external condensate pump may be
installed if there is not sufficient slope to drain condensate under
gravity to its destination.
To avoid overflow of the condensate pan, the drain line
and trap should be inspected periodically to ensure they are not
plugged with accumulated debris.