Pentair XLHP Installation And User Manual

AQUATIC ECO-SYSTEMS™

™

XLHP

HIGH PERFORMANCE HEAT PUMP

IMPORTANT SAFETY INSTRUCTIONS

READ AND FOLLOW ALL INSTRUCTIONS

SAVE THESE INSTRUCTIONS

INSTALLATION AND

USER'S GUIDE

i

CUSTOMER SERVICE / TECHNICAL SUPPORT

If you have questions about ordering Pentair Aquatic Eco-Systems replacement parts, and products, please use
the following contact information:

Customer Service
8 AM to 7 PM — Eastern and Pacific Times

US

Phone: [phone]
FAX: [phone]

International

Phone: [phone]
FAX: [phone]

Web site

Visit www.pentairaes.com

TABLE OF CONTENTS

Important Warning and Safety Instructions .......

Operator and Service Control Panel Menus ......

Before Installing the Heat Pump .........................

Heat Pump Overview
General Features
Heat Pump Installation Requirements
General Installation Information

Installation and Location .....................................

Materials Needed for Installation
Equipment Pad
Drainage and Condensation, Roof Run Off,

and Lawn Sprinklers
Heat Pump Dimensions
Location and Clearances
Anchor Clamp Installation
Water Connections and Plumbing
Automatic Flow Control Valve
Water Pressure Switch Adjustment
Multiple Unit Installation

Heat Pump, Heater, Solar

Multiple Heat Pump Connections
Electrical Connections and Wiring
Wiring Diagram – (Single Phase – 50/60 Hz)

Connecting to an Automation System ...............

Remote Operation/Relay Remote Controls

Operating the Heat Pump ....................................

Energy Saving Tips
Heat Pump Control Panel Overview
Operator Menu Tree Guide

Stopping and Starting the Heat Pump

Changing the Set Point - TANK1 and TANK2

Heat, Cool, and Auto Modes

Activate Heat Pump Timer

Relay Remote

ii

iii

1

1
1
1
1

2

2
2

2
2
3
3
4
4
5
6
6
6
8
9

10

10

11

11
11
12
13
13
13
13
13

AutoSet Operation
Extend Mode
Timers and Delays
Control Panel Alarm Messages

Service Menu Tree Guide

Set Water Temperature Offset
Defrost Cycle

Locking the Control Panel

Maintenance ........................................................

Water Chemistry
Winterizing
Spring Start Up
Inspection and Service
Owner Inspection
Professional Maintenance and Service

Technical Information ........................................

Electrical Supply - Voltage Requirements
Temperature Resistance Chart
Ambient/Water Flow Table for Professional
Maintenance and Service
Heat Pump Pressure Drop

Troubleshooting .................................................

Replacement Parts .............................................

Illustrated Parts View
Parts List

14
14
15
15
16
17
17
17

18

18
18
18
18
18
19

20

20
20

21
21

22

26

26
27

For energy saving tips, refer to page 11, under “Operating the Heat Pump”. For technical data, voltage
requirements, or ambient/water flow information, refer to page 20-21 at the back of the manual.

P/N 475093 Rev. A 6/11/14

XLHP™ High Performance Heat Pump Installation and User's Guide

IMPORTANT WARNING AND SAFETY INSTRUCTIONS

Important Notice:

This guide provides installation and operation instructions for the
XLHP™ Heat Pump. Consult Pentair with any questions regarding this
equipment.

Attention Installer: This guide contains important information about
the installation, operation and safe use of this product. This information
should be given to the owner and/or operator of this equipment after
installation or left on or near the heat pump. This heat pump is for use for

aquaculture installations ONLY. Do not use with any type of swimming
pool, hot tub, or spa.

Attention User: This manual contains important information that will help
you in operating and maintaining this heat pump. Please retain it for future
reference. This heat pump is for use for aquaculture installations ONLY.

Do not use with any type of swimming pool, hot tub, or spa.

Warnings and safety instructions for Pentair Aquatic Eco-Systems heat
pumps and other related products are available at:

http://www.pentairaes.com or call U.S. [phone] • International
[phone] for additional free copies of these instructions.

Before installing this product, read and follow all

warning notices and instructions which are included.
Failure to follow safety warnings and instructions can result in severe
injury, death, or property damage.

Codes and Standards

XLHP heat pumps are listed by ETL as complying with the latest edition
of the “UL Standard for Safety for Heating and Cooling Equipment”, UL
1995 and CSA C22.2 No. 236.

All Pentair heat pumps must be installed in accordance with the local
building and installation codes as per the utility or authority having
jurisdiction. All local codes take precedence over national codes. In the
absence of local codes, refer to the latest edition of the National Electric
Code (NEC) in the United States and the Canadian Electric Code (CEC)
in Canada for installation.

RISK OF ELECTRICAL SHOCK OR
ELECTROCUTION.

The electrical supply to this product must be installed by a licensed,
certified electrician or qualified personnel in accordance with the
National Electrical Code and all applicable local codes and ordinances.
Improper installation will create an electrical hazard which could result
in death or serious injury to equipment users, installers, or others due
to electrical shock, and may also cause damage to property. Read and
follow the specific instructions inside this guide.

ii

Warranty Information

Heat pumps are sold with a limited factory warranty. Details are specified
on the warranty card. Make all warranty claims to an authorized Pentair
dealer or directly to the factory. Claims must include the heat pump serial
number and model (this information can be found on the rating plate),
installation date, and name of the installer. Shipping costs are not included
in the warranty coverage. This warranty does not cover damage caused
by improper assembly, installation, operation, improper water chemistry
balancing or other chemical abuse, or improper sanitation application,
winterizing, field modification, or failure to earth bond and properly ground
the unit. Any changes to the heat pump, evaporator, heat exchanger, wiring,
or improper installation may void the warranty.

General Specifications

Installation Location Certified for use:
OUTDOOR USE ONLY. Failure to provide the proper clearances
outlined on page 3 will lower the performance of the heat pump
and void the warranty.
Water Pipe/Heater Connection — Plastic 2” PVC (Unions included)

Flow Rate

Maximum 120 gpm [456 lpm] - If system flow rate exceeds 120 gpm, a
bypass valve is required.
Minimum 30 gpm [110 lpm]
Maximum Working Water Pressure 50 psi

For Electrical Supply and Voltage Requirements, refer to the table
on page 20.

Do not permit children to use this product.

XLHP™ High Performance Heat Pump Installation and User's Guide

OPERATOR

MENU TREE

TANK1

IDLE/HEAT/COOL

SET=__ ACT=__

TANK2

IDLE/HEAT/COOL

SET=__ ACT=__

HEAT / COOL / AUTO

SET TO - H/C/A

HEAT PUMP RUNTIME

REMAINING = NONE

REMOTE MODE

OFF/RELAY

AUTOSET

OVERRIDE IS ON/OFF

ALARM STATUS

RESTA RT / PUMP START /

SENSING WATER TEMP

DELAYS

SUCTION TEMP

ACTUAL = ___

HEAT/COOL/AUTO MODE

TANK1/TANK2

*

**

***

****

EXTEND

OVERRIDE IS ON/OFF

HEAT/COOL/AUTO

HEAT/COOL/AUTO

**

SERVICE

MENU TREE

LANGUAGE - IDIOMA - LANGUE

ENGLISH / ESPANOL / FRANCAIS

SOFTWARE VERSION

REV. ____

PUMP START TIME

TIME = 1 - 4 HRS

TEMPERATURE SCALE

FAHRENHEIT / CELSIUS

PRESS TANK1/TANK2

TO EXIT SETUP

WP HP LP T1 T2

1 1 1 0 0

FAN COMP PMP REV

1 1 1 0

DEFROST

ENABLE / DISABLE

WATER TEMP OFFSET

OFFSET = -2 TO +2

PUMP START DELAY

TIME = 0 - 5 MINS

EXTEND

ENABLE / DISABLE

AUTOSET

ENABLE / DISABLE

†

††

RUN TIMES/COUNTS

OR TO VIEW

TEMP. RECORD

HOUR # ___ ___°F

iii

XLHP™ HEAT PUMP MENU TREE QUICK START GUIDE

1. Push the ON/OFF button to turn the unit on, the green “ON” light should be lit.

2. Select either TANK1 or TANK2 mode. The default is TANK1 mode.

3. Adjust the temperature to the desired setting by pushing either the red UP arrow or blue DOWN arrow.

4. Allow 5 minutes for compressor restart delay.

See pages 12-17 for details on the operator menu and service menu screens on the control panel.

XLHP™ High Performance Heat Pump Installation and User's Guide

Menu appears only if Heat and Cool mode is enabled

*

at the factory.

**

Menu appears only if Autoset or Extend is enabled in the
Service Menu.

***

Menu appears only if a delay is active.

****

Menu appears only if defrost is enabled in the Service Menu.

INPUT STATUS

†

WP = WATER PUMP SWITCH
HP = HIGH REFRIGERANT PRESSURE SWITCH
LP - LOW REFRIGERANT PRESSURE SWITCH
T1- TANK1 REMOTE
T2 - TANK2 REMOTE

THE NUMBER ONE (1) IS
DISPLAYED WHEN THE
ASSOCIATED INPUT/
OUTPUT IS ON AND ZERO
(0) IS DISPLAYED WHEN
INPUT/OUTPUT IS OFF.

OUTPUT STATUS

††

FAN - FAN
COMP - COMPRESSOR
PMP - FILTER PUMP
REV - REVERSING VALVE

1

BEFORE INSTALLING THE HEAT PUMP

XLHP™ Heat Pump Overview

Your Pentair heat pump will provide you with years of
service and excellent performance. Heat pumps operate
by taking heat from the surrounding air and transferring it
into the water. The warmer the air and the more humidity
in the air, the more latent heat is available for heating
your body of water. With a properly sized heat pump for
your body of water, the heat pump should raise the water
temperature an average of 1° F per hour depending on
air temperature, humidity, and starting water temperature.
The ideal or rated condition for the heat pump is 80° F
air temperature, 80% relative humidity, and 80° F water
temperature. As conditions decrease from 80/80/80, the
heat pump performance will decrease slightly.

Heat Pumps are best utilized to maintain a set water
temperature; they are not intended to provide instant
or fast heating. It is not reasonable to expect a heat
pump to perform like a gas heater which has a much
higher BTU output and faster response. Additionally, gas
heaters are not dependent on environmental conditions.
Aquaculture heat pumps are very similar to home heating
and air conditioning heat pumps and therefore should
be treated similarly.

Proper operation and use of the heat pump is to set it at
your desired temperature and leave it. Your heat pump
will turn on and off automatically to maintain your desired
temperature much like your home HVAC unit. To take
advantage of the sun’s energy, operate your heat pump
during the heat of the day.

Your heat pump will still operate when the temperature
drops at night, but the output will be decreased. It is
acceptable to shut the heat pump off and not use it for
extended periods of time. When you have a need to
heat your aquaculture system, please plan accordingly
since it may take the heat pump days to heat the body
of water back to your desired temperature, depending on
its starting temperature and environmental conditions.

Heat Pump Installation Requirements

Correct installation is required to assure safe operation.
The requirements for Pentair heat pumps include
the following:

• Dimensions for critical connections.

• Field assembly (if required).

• Appropriate site location and clearances (pages 2-3).

• Proper electrical wiring (pages 8-9).

• Adequate water flow (page 6).

This manual provides the information needed to
meet these requirements. Review all application and
installation procedures completely before continuing
the installation.

General Features

• Dual digital thermostats offer precise temperature
control to maintain the desired separate water
temperatures in unique aquaculture systems without
overheating or wasting energy.

• Long-life corrosion resistant composite plastic
cabinet stands up to severe climates and chemicals.

• 100% pure titanium heat exchanger assures
corrosion-free performance for extra long life.

• Self-diagnostic control panel monitors and
troubleshoots heat pump operations to ensure safe,
dependable operation.

• AutoSet (time clock over-ride) feature monitors
water temperature and turns the water circulation
pump on and off as needed to maintain desired
water temperatures.

• Extend (time clock over-ride) feature monitors water
temperature and turns the water circulation pump
on and off as needed to prolong a heating cycle that
has been interrupted.

• Automatic Defrost feature senses refrigerant
temperature and prevents the evaporator coil from
freezing, allowing the heat pump to operate at
even lower temperatures.

• Thermostatic expansion valve (TXV) controls
refrigerant flow for optimum efficiency and BTU
output over a wider operating range.

• Elevated base pan for positive drainage of
condensation.

• 2-inch plumbing connections for easy installation.

• Separate isolated electrical compartment prevents
internal corrosion, extends heater life.

• Highest efficiency available, meets or exceeds
existing codes and standards.

• Adjustable timer allows the operator to set the heat
pump to run for a predetermined time. Incremental
by 10 minutes to a maximum of 99 hours.

• An extensive list of operational conditions, alarms
and water temperatures is logged on the control
board. This information is available for the user to
track performance and troubleshoot issues.

General Installation Information

1. Installation and service must be performed by
a qualified installer or service agency, and must
conform to all national, state, and local codes.

2. Heat pumps get electrical power from an
external source and provide a dual electronic
thermostat control system for unique aquaculture
combinations or preheat convenience.

3. This heat pump is specifically designed for heating
fresh water bodies of water. Do not use it as a
general service heater. Consult your dealer for the
appropriate Pentair products for these applications.

XLHP™ High Performance Heat Pump Installation and User’s Guide

2

38.7"

(983 mm)

4.5"

(114 mm)

9.25"

(235 mm)

11.25"

(286 mm)

A

34.0"

(864 mm)

32.0"

(813 mm)

30.7"

(780 mm)

INSTALLATION AND LOCATION

When equipment is located below the water surface, a leak from any component can cause large scale water loss or flooding.
Pentair Aquatic Eco-Systems, Inc. cannot be responsible for such water loss or flooding which may cause damage to property or
to the product. Avoid placing the heat pump in locations where it can cause damage by water or condensate leakage. If this is not
possible, provide a suitable drain pan to catch and divert any leakage.

Only a qualified service person should install the XLHP™
Heat Pump. Before installing this product, refer to the
Important Warning and Safety Instructions on page ii.

Materials Needed for Installation

The following items are needed and are to be supplied
by the installer for all heat pump installations:

1. Plumbing connections (2-inch).

2. Level surface for proper drainage.

3. Suitable electrical supply line. See rating plate on
unit for electrical specifications. A junction box is not
needed at the heat pump; connections are made
inside of the heat pump electrical compartment.
Conduit may be attached directly to the heat pump
jacket.

4. Electric cutout switch that will interrupt all power to
the unit. This switch must be within line of sight of
the heat pump. Check local codes for requirements.

5. Watertight conduit to run the electrical supply line.

Equipment Pad

For proper drainage of condensation and rain water,
place the heat pump on a flat slightly pitched surface,
such as a concrete or fabricated slab (pad).

If possible, place the pad at the same level or slightly
higher than the filter system equipment pad.

Note: Be sure that the pad is pitched not more than 1/4
in. per foot in any direction as needed for runoff.

Drainage and Condensation

Condensation occurs from the evaporator coil while the
unit is running, and drains at a steady rate (usually three
to five gallons per hour), depending upon ambient air
temperature and humidity. The more humid the ambient
conditions, the more condensation will be produced.

The bottom of the unit acts as a tray to catch rainwater
and condensation. Keep the drain holes, located on the
bottom pan of the base of the unit, clear of debris.

Roof Run-off

Make sure the heat pump is not located where large
amounts of water may run-off from a roof into the unit.

Sharp sloping roofs without gutters will allow massive
amounts of rain water, mixed with debris from the roof
to be forced through the unit. A gutter or down spout
may be needed to protect the heat pump.

Lawn Sprinklers
Avoid placing lawn sprinkler near the heater -

they can spray water into the heater and void the
warranty. Be sure to direct any spraying water away

from the heater. Note the wind direction to be sure
water from sprinklers is not blown toward the heater.
Sprinkler heads can produce high water pressure and
spray at an angle, different from typical rain and humid
weather. Also, sprinklers connected to a well water
system can cause mineral build up on the evaporator
coils and electronics. Salt water can also be an issue if
located near the coast.

XLHP™ High Performance Heat Pump Installation and User’s Guide

Dimension “A” of 120 H/C & 140 H/C = 45.5” (1156 mm)

Heat Pump Dimensions

NO SPRINKLERS

Location and Clearances

3

All criteria given in the following sections reflect minimum
clearances. However, each installation must also be
evaluated, taking into account the prevailing local
conditions such as proximity and height of walls, and
proximity to public access areas.

The XLHP™ Heat Pump must be placed to provide
clearances on all sides for maintenance and inspection.

1. At least 24 in. [610 mm] access must be available in

the front and 12 in. [305 mm] on all the other sides
of the heat pump for service and proper air flow.
(Manufacturer’s recommendation).

2. If the heat pump is to be installed under a cover
or under a vertical overhang, the unit must have a
minimum of 5 ft [1.52 m] clearance from the top of
the heat pump. (Manufacturer’s recommendation).

3. Install a minimum of 5 ft [1.52 m] from the body of
water unless the heat pump is separated from the
body of water by a 5 ft [1.52 m] high solid fence
or other permanent barrier. Canadian installations
require a minimum of 3 meters from the body of
water.

4. Install heat pump a minimum of 6 in. [153 mm] from
any wall or large obstacle.

OPEN

AIR FLOW OUT

EVAPORATOR

COILS

OVER HANG

5

FT min.

(1520 mm)

12"

min.

(305 mm)

SLAB

Anchor Clamp Installation

Installation of the anchor clamps is recommended in
all installations. Installation of the anchor clamps is
required in Florida (see Florida Building Code 301.13).

Anchor clamps hold the heat pump to the equipment
pad in order to withstand high winds caused during
extreme weather (i.e. hurricanes).

To install the anchor clamps:

1. Be sure the heat pump is in its permanent location
on the equipment pad.

2. Place the clamps at the base of the heat pump in
the four (4) locations, shown in the image to the
right.

Note: Bolts and bolt anchors are not included with
the heat pump. The installer must provide 1/4” x
1-3/8” stainless steel anchor bolts and the appro­priate size concrete anchor to mount the clamp to
the equipment pad. Be sure to check local codes.

3. Fit the hook of each clamp over the lip on the
base panel of the heat pump. The hook should fit
between the lip of the base panel and the evapo­rator coil guard.

SERVICE
ACCESS

24" min.

(610 mm)

12"

min.

(305 mm)

Heat Pump Location and Clearances

3"

(76 mm)

Heat Pump

Clamps

XLHP™ High Performance Heat Pump Installation and User’s Guide

SLAB

6

"

min.

(153 mm)

AIR
FLOW
IN

Anchor Clamp Installation

Heat Pump

Clamps

4

HEAT PUMP

Anchor Clamp Installation, Continued

4. Mark the position of the hole in each clamp on the
equipment pad.

5. Use a masonry drill bit and drill a hole in the
cement with a diameter as determined by the
concrete anchor, at each of the marks on the
equipment pad. The hole should be approximately
1½ in. deep.

6. Insert a bolt anchor into each of the holes. Be sure
the anchors are set completely into the holes.

7. Position the anchor clamps so that the holes in the
clamps are over the bolt anchors.

Be sure that the clamp hooks are over the lip of

the heat pump base.

8. Insert an anchor bolt through each clamp into the
anchor and tighten to secure the clamp and heat
pump to the equipment pad.

AIR COIL GUARD

AIR

COIL

1-3/8" HEX BOLT

(installer provided)

HEAT PUMP

HEAT PUMP

BASE

EQUIPMENT PAD

CONCRETE

ANCHOR CLAMP

BOLT ANCHOR

(installer provided)

Water Connections and Plumbing

The image below shows the standard plumbing layout
with a single XLHP™ Heat Pump unit. Follow the image
from right to left for the standard plumbing sequence.

Arrangement of aquaculture system components (other
than the standard plumbing image below), and the
location of the heat pump (above or below the water
surface) can affect the operation of the heat pump’s
water pressure switch.

The pressure switch can be adjusted to accommodate
this effect if the heat pump water connections are no
more than 6 ft below the water surface.

See instructions for pressure switch adjustment on the
next page. If the heat pump is installed outside of this
range, an external pressure switch may need to be
installed in the plumbing upstream of the heat pump.

Note: Be advised that when equipment is located below
the water surface a leak can result in large-scale water
loss or flooding. Pentair is not responsible for such water
loss or flooding or damage.

Automatic Flow Control Valve

The inlet/outlet header of the heat pump comes
equipped with an internal automatic flow control valve.
The automatic flow control valve maintains the proper
flow through the heat pump at rates up to 120 gpm
(456 lpm). If the filter system flow rate is higher than
120 gpm (456 lpm), install a manual bypass valve, see
image below.

Note: Be advised that if your circulation pump is over
2 HP or if the total flow exceeds 120 gpm (456 lpm),
you will have to add an external bypass valve. Excess
water flow will damage the heat exchanger.

Anchor Clamp Installation

CHEMICAL FEEDER

TO BODY OF WATER

XLHP™ High Performance Heat Pump Installation and User’s Guide

MANUAL BYPASS VA LVE

(Optional)

Standard Plumbing Layout

FILTER

PUMP

FROM BODY OF WATER

Water Connections to the Heat Pump

2 in. Quick Connect fittings have been installed on the
water inlet and outlet connections. Filtered cool water
is plumbed to the inlet, located on the right side of the
XLHP™ Heat Pump. Heated water flows through the
outlet, located on the left side of the heat pump.

Plastic piping (PVC Schedule 40) should be connected
to the heat pump. The unions, provided with the unit,
accept 2 in. PVC pipe.

WATER

INLET UNION

WATER

OUTLET UNION

Heat Pump Water Connections

Always be sure that flow requirements and
water turnover rates can be maintained with the

installation of additional heat pumps and plumbing restrictions.

Water Pressure Switch Adjustment

The pressure switch is preset at the factory for
activation at 1.5 psi [10 kPa]. This factory setting
works for most basic installations. Only adjust the
water pressure switch if the heat pump does not
operate when the proper flow is applied to unit
or if the heat pump does not shut off when the
filter pump is off. Occasionally, unusual plumbing
configurations or necessary restrictions in the
plumbing may cause pressure sensing problems.
In these rare situations, the plumbing system
configuration may require adjustment of the water
pressure switch.

Adjustment of the pressure switch may be necessary
if any part of the filter system piping is 3 feet [0.91 m]
or more above the top of the heat pump.

In general, if the heat pump is installed more than 6 ft
[1.83 m] below the water surface, an external water
flow switch must be added to the plumbing system.

On some installations, the piping from the heat pump
to the body of water is very short. The back pressure
could be too low to trigger the pressure switch. If this

The water pressure switch should be adjusted to

turn the heater off when the pump is off. Setting the
switch to close at too low of a flow can damage the appliance. Adjust the
switch to turn the heater off, not on.

5

happens, install a directional fitting or elbow where the
return line enters the body of water. This will increase
back pressure for the heat pump to operate properly. Be
sure to check that the system flow is above the minimum
requirement of 30 gpm (110 lpm) after the directional
fitting installation.

Be sure the filter is clean before making any pressure
switch adjustment: A dirty filter will restrict the water
flow and the pressure switch cannot be adjusted
properly.

To adjust the pressure switch:

The following adjustment is for installations where
the heat pump is below water level.

1. Be sure that all valves in the system are set to allow
water flow through the heat pump. Start the filter
pump.

2. Set the heat pump temperature above the actual
temperature to call for heat. Turn the heat pump ON.

3. Once the heat pump is running, turn off the filter
pump. The heat pump should turn off immediately.

4. If the heat pump continues to operate when the filter
pump is off, then the water pressure switch needs to
be adjusted.

5. Remove the heat pump’s left front panel and remove
remaining right front panel. The water pressure switch
is located in the water plumbing in the lower right
corner of the heat pump.

6. Slowly rotate the adjustment wheel on the water
pressure switch in a clockwise direction until the
“LOW WATER FLOW” Alarm shows on the LCD,
the red SERVICE light turns ON, and the heat pump
stops.

7. Check the setting of the water pressure switch by
starting and stopping the filter pump and checking
the control panel and operation of the heater between
each flow change.

8. If the water pressure switch cannot be adjusted to
accommodate the conditions listed above, an exter nal
flow switch must be added to the plumbing system
to ensure that the heat pump will not operate without
the proper flow through the heat exchanger.

The following adjustment is for installations where
the heat pump is above water level.

1. Be sure that all valves in the system are set to
allow water flow through the heat pump. Start the
filter pump.

2. Set the heat pump temperature above the actual
temperature to call for heat. Turn the heat pump
ON.

3. If the LCD shows a “LOW WATER FLOW” Alarm
and red SERVICE light is present then the water
pressure switch needs to be adjusted.

XLHP™ High Performance Heat Pump Installation and User’s Guide

6

FROM SOLAR

R

S

N

Water Pressure Switch Adjustment,
Continued

4. Remove the XLHP™ Heat Pump’s left front panel
and remove remaining right front panel. The water
pressure switch is located in the water plumbing in
the lower right corner of the heat pump.

5. Slowly rotate the adjustment wheel on the water
pressure switch in a counterclockwise direction
until the “LOW WATER FLOW” Alarm and red
SERVICE light vanish, time delay countdown will
start.

6. Once the heat pump is running, turn off the filter
pump. The heat pump should turn off immediately.

7. If the heat pump continues to operate when the
filter pump is off, turn the adjustment wheel on
the water pressure switch in a clockwise direction
until the “LOW WATER FLOW” Alarm shows on
the LCD, the red SERVICE light turns ON, and the
heat pump stops.

8. Check the setting of the water pressure switch by
starting and stopping the filter pump and checking
the control panel and operation of the heater
between each flow change.

9. If the water pressure switch cannot be adjusted
to accommodate the conditions listed above,
an external flow switch must be added to the
plumbing system to ensure that the heat pump will
not operate without the proper flow through the
heat exchanger.

12"

min.

(305 mm)

Multiple Unit Installation

1. Heat Pump, Heater and/or Solar Combination

In certain regions of the country it may be more
economical to run a heat pump during the warmer months
and a gas heater during the cooler months. In some
situations it may be desirable to run the heat pump in the
“Chiller” mode, if so equipped, during the hottest portion
of the year and a heater during the cooler months. The
Pentair heat pump may be used in conjunction with a
gas or electric heater or any combination of heat sources
including solar. All heat sources must be plumbed in
series to work correctly and efficiently.

A recommended plumbing layout for a heat pump / heater
/ solar combination heating system for an aquaculture
combination is shown below. Your system may not contain
all of these components, but the basic plumbing will apply
by eliminating the component in the illustration that is not
a part of your system.

2. Multiple Heat Pump Connections

All plumbing on multiple heat pump installations must be
done in parallel (see image below). An equal flow of water
to each heat pump is important for optimum operation.

Note: It may be necessary to adjust the water pressure
switch if a unit is installed below the water level. Refer
back to page 5 for details on when and how to adjust
the pressure switch.

Each heat pump allows a maximum flow rate of
100 gpm (380 lpm) and requires a minimum of 30
gpm (110 lpm).

TANK 1

RETUR

TANK 2
MAKE-UP

TANK 2

TANK 2
DRAIN

CHECK

VALVE

FILTE

TANK 1
DRAIN

TANK 1

TANK 2

XLHP™ High Performance Heat Pump Installation and User’s Guide

HEAT PUMP

CHECK

P

PUMP

VALVE

FROM SOLAR

TO SOLAR

Multiple Unit Installation:
Heater and/or Solar Combination