EarthLinked PHXTI Series User manual

PHXTI-IM (05/13)Copyright 2013 Earthlinked Technologies, Inc.
EarthLinked®
Series PHXTI Pool Heat Exchangers
Installation Manual
CONTENTS
PAGE
Pre-Installation
3
Installation
3
•Water Connections
4
•Refrigerant Connections
7
•
Freeze Protection/Winterizing
11
•
Warranty
12

PHXTI-IM (05/13) Page 2
Disclaimer
The EarthLinked®Pool Heat Exchanger is sold as a system component part and must be properly
sized and matched to other system components to provide the intended performance and safe
operation of the system. Installation and servicing of this heat exchanger must be done only by a
servicing technician qualified in pool heating and HVACR equipment, and in accordance with
instructions set forth in this manual.
EarthlinkedTechnologies shall not be liable for any defect, unsatisfactory performance, damage or
loss, whether direct or consequential, relative to the design, manufacture, construction, application
or installation of other components in the swimming pool system. All warranty claims shall be
handled directly through Aqua-Cal Inc,. St. Petersburg, FL.
Earthlinked Technologies, Inc.
4151 South Pipkin Road
Lakeland, Florida 33811
tel. [phone] ● fax [phone]
[e-mail] ● www.earthlinked.com

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1. Pre-Installation
Upon receipt of the swimming pool heat exchanger, check the model number against the bill of
lading.
The Earthlinked Technologies model numbers are as follows:
Model Number
Rating, BTU/HR
PHXTI-90
90,000
PHXTI-115 115,000
PHXTI-130 130,000
This heat exchanger is approved for use with swimming pool heat pump heating systems using
R-410A, R-407C or R-22 refrigerants.
This swimming pool heat exchanger is sold as a system component, and must be sized and
properly matched to other system components to provide the anticipated performance and safe
operation of the system.
2. Installation
The heat exchanger is designed to be used as a replacement component in an existing swimming
pool heat pump heating system, or as a component of a new swimming pool heat pump heating
system.
The overall dimensions of the heat exchanger are illustrated in Figure1. The heat exchanger must
be mounted on a level, hard surface and oriented in the direction shown in Figure 1 (vertically, with
connections on the top) to perform properly.

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Figure 1. Heat Exchanger Dimensions
A. Water Connections
A typical piping arrangement for the installed heat exchanger is shown in Figure 2.
The heat exchanger is installed downstream of the filter and upstream of the water conditioning
system. The heat exchanger shall be no more than 10 feet from the heat pump compressor unit. In
addition, the heat exchanger water inlet and outlet connections shall have union connections to the
water circuit.

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Figure 2. Typical Pool Installation Piping
The heat exchanger water connections are nominal 2 inch PVC. Plumb these connections first, as
follows:
1. With abrasive cloth (Oatey #31411 or equivalent), roughen the ID surfaces of the female
connectors on the heat exchanger and the OD surfaces on the water supply and return PVC
pipes.
2. Clean the same surfaces in item 1 with PVC Cleaner (Oatey #30782 or equivalent) and
allow to dry.
3. Apply PVC Cement (Oatey #30863 or equivalent) to the cleaned areas in step 2.
4. Be sure the correct water pipe is aligned with the correct connection on the heat exchanger.
5. Press one pipe at a time into the appropriate water fitting on the heat exchanger and
maintain push pressure for 30 seconds.

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Figure 3. Heat Exchanger Refrigerant Connections

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B. Refrigerant Connections
The refrigerant connections are shown in Figure 3. Each connection is 5/8 inch OD copper tube.
The refrigerant line connections are brazed as follows:
1. Clean and deburr the copper stub outs and the field supplied fittings that will make the
connections from the refrigeration system.
2. Use 15% silver brazing alloy to seal the refrigeration connections.
3. Make provisions to use the nitrogen brazing technique as described below to braze the
refrigerant joints.
4. Before brazing the refrigerant joints, protect the SWAGLOK®fittings illustrated in Figure 3 by
wrapping each joint with a wet cloth, and further protect it from direct torch flame with an
inflammable shield as shown in Figures 4, 5 and 6.

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Figure 4. Wrap SWAGLOK®Joints

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Figure 5. Apply Flame Retardant Shield

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Figure 6. Braze Joints

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5. After the refrigerant joints have been brazed, seal test the joints by pressurizing the
refrigeration system to 150 psig dry nitrogen and check each joint with a quality leak
detector.
6. Next, evacuate the refrigeration system in accordance with the pool heater system
manufacturer’s instructions, being sure to thoroughly remove all moisture from the system.
7. Charge the system in accordance with the pool heater manufacturer’s instructions.
After purging the water system of air, re-applying electrical power, start the system in accordance
with pool heater manufacturer’s instructions, and monitor the operation of the system through at
least two compressor start/stop cycles to ensure the system is performing properly.
C. Freeze Protection/Winterizing
In areas where freezing conditions are a rare occurrence, run the filtration system continuously
through the freeze period. Generally, during a light freeze, circulating water will not freeze.
In areas where freezing conditions are prevalent and more severe, implement the following
instructions to winterize the heat exchanger. Follow manufacturer’s instructions to winterize
other system components.
1. Disconnect all electrical power to the system, including the compressor unit and water
circulating pump.
2. At the two water connections to the heat exchanger, loosen the union joints, but do not
totally disconnect the unions.
3. Locate the drain plug at the bottom of the heat exchanger, remove it, and let all the water
drain out of the heat exchanger.
4. After ALL water has been drained from the heat exchanger, replace and tighten the drain
plug.
5. Allow the unions to remain loosely connected until the swimming pool is to be made
operational again. Tighten unions at that time.
6. After the system has been made operational again, check the heat exchanger plug and the
two (2) unions to ensure they do not leak.

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D. Warranty
All warranty claims shall be handled directly through AquaCal AutoPilot, Inc.