Maritime Geothermal WH-Series, Инструкция по установке и обслуживанию

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1-Oct-2015 Page 17 002028MAN-01
Once the ground loop has been pressure tested and the header
pipes have been connected to the circulator pump module, the
heat pump can be connected to the circulator pump module.
CIRCULATOR PUMP MODULE
Maritime Geothermal Ltd. has compact pump modules with
built in three way valves to facilitate filling and purging the
ground loop.
Refer to drawing 000610CDG at the end of this
section. Alternatively, Grundfoss® Model UPS 26-99 or Taco®
Model 0011 pumps or other brands with similar pumping
capability may be used. The single pump module will typically
handle systems up to 3 tons (model sizes 25 - 45); the two
pump module will typically handle 4 to 6 ton systems (model
sizes 55, 65, 75). This is based on a typical parallel system with
one circuit per ton.
Maritime Geothermal recommends calculating the total
pressure drop of the ground loop (including headers, indoor
piping and heat pump exchanger drop) based on the antifreeze
type and concentration at the desired minimum loop
temperature. A pump module that can deliver the flow required
for the unit
at the calculated total pressure drop should be
selected. Refer to the Model Specific Information section for
unit flow requirements.
Loop pressure drops can be calculated using software such
as those mentioned in the Horizontal Ground loops section, or
can be calculated in a spreadsheet using the pipe
manufacturer’s pressure drop tables for pipe diameter and
fittings.
The circulator pump module must be connected to the heat
pump Outdoor Loop ports with a lineset suitable for the flow
required with minimum pressure drop. 1” rubber or plastic lines
should be used. The installation of P/T plugs (pressure /
temperature, pronounced “
Pete’s plugs” ) is recommended on
both the entering and leaving lines at the heat pump (see
Diagram A).
The P/T plug will allow the installer or homeowner to check
water flow through the loop by measuring the pressure
difference through the heat exchanger and comparing it to that
listed in the
Model Specific Information section , or the
specifications document
.
Optional fittings with P/T ports are
available for the circulator pump modules sold by Maritime
Geothermal Ltd..
Ground Loop System Information
FLUSHING & PURGING
Once the groundloop has been installed and all connections
are completed between the heat pump, circulator pump module
and ground loop, the entire ground loop system should be
pressure tested with air to 100 PSIG to make sure there are
no leaks on any of the inside fittings. Soap all joints and observe
that the pressure remains constant for 1 hour.
When satisfied that all connections are leak free, release the
air pressure and connect a purge cart (see Diagram B) to the
flushing access ports at the pump module (refer to drawing
000610CDG) . A temporary flushing system can alternately be
constructed using a 45 gal. barrel and a pump with sufficient
volume and head capability to circulate fluid at a
velocity of at
least 2 ft./min. through all parts of the loop.
Adjust the circulator pump module valves to connect the
purge cart to the ground loop. Begin pumping water through the
ground loop, ensuring that the intake of the pump stays
submerged at all times by continuously adding water. Water
flowing back from the return line should be directed below the
water level in the barrel or flush tank to prevent air being mixed
with the outgoing water.
IMPORTANT NOTE: The R134a WH-series absolutely
requires a minimum source fluid temperature of 50
° F
or greater. This is different from standard geother-
mal heat pumps which use R410a refrigerant.
!
IMPORTANT NOTE: The 50 ° F temperature require-
ment means the WH-series may use a ground loop
source only in suitably warm climates. Remember
that WH units are heating-only, so only extract heat
from (never reject heat to) the ground loop.
!
DIAGRAM A - Typical P/T – “Pete’s” Plug &
Thermometer Stems