Enertech VC Series Instruction manual

I. CONTENTS
II. Key & Legend ................................................................................................................................................................... 4
Key to Model Numbers ....................................................................................................................................................... 4
Legend for Tables ................................................................................................................................................................ 4
III. Warnings & Cautions ....................................................................................................................................................... 5
IV. General Information ........................................................................................................................................................ 5
Inspection............................................................................................................................................................................ 5
Storage ................................................................................................................................................................................ 6
Protection............................................................................................................................................................................ 6
Pre-Installation Preparation ................................................................................................................................................ 6
V. Best Practices................................................................................................................................................................... 6
System Sizing ....................................................................................................................................................................... 6
Building Heat Loss/Heat Gain .......................................................................................................................................... 6
Ground Sources and Design Water Temperatures ........................................................................................................ 7
Temperature limitations.................................................................................................................................................. 7
Ground Source Design......................................................................................................................................................... 7
Ground Loop Installation ................................................................................................................................................. 7
Ground Water Installation............................................................................................................................................... 8
Application Diagrams .......................................................................................................................................................... 9
Unit location/mounting....................................................................................................................................................... 9
VI. Electrical......................................................................................................................................................................... 10
Controller .......................................................................................................................................................................... 10
LED Lights .......................................................................................................................................................................... 12
VII. Heat Pump Commissioning............................................................................................................................................ 13
Maintenance ..................................................................................................................................................................... 14
VIII. Accessories .................................................................................................................................................................... 14
Room Thermostat.............................................................................................................................................................. 14
Desuperheater................................................................................................................................................................... 15
IX. Engineering Specifications............................................................................................................................................. 17
Performance Ratings ......................................................................................................................................................... 17
3 Ton Performance Ratings............................................................................................................................................ 17
4 Ton Performance data ................................................................................................................................................ 17
5 ton Performance data................................................................................................................................................. 18
Performance Data ............................................................................................................................................................. 19
3 TON FULL load Heating & Cooling Performance Data ................................................................................................ 19

2
3 TON Part load Heating Performance Data.................................................................................................................. 20
4 TON FULL LOAD Heating & Cooling Performance Data .............................................................................................. 21
4 TON PART load Heating Performance Data................................................................................................................ 22
5 TON FULL load Heating & Cooling Performance Data ................................................................................................ 23
5 TON PART load Heating Performance Data................................................................................................................ 24
Physical Data ..................................................................................................................................................................... 25
unit Dimensions ............................................................................................................................................................. 25
Electrical Data.................................................................................................................................................................... 26
Blower Performance.......................................................................................................................................................... 26
ECM Blower Data........................................................................................................................................................... 26
Water Coil Pressure Drop Ratings ..................................................................................................................................... 27
3 TON ............................................................................................................................................................................. 27
4 TON ............................................................................................................................................................................. 27
5 TON ............................................................................................................................................................................. 27
X. Figure ............................................................................................................................................................................. 28
Figure 1 – Ground Loop Water Plumbing ...................................................................................................................... 28
Figure 2 – Ground Water Plumbing ............................................................................................................................... 28
Figure 3 –Desuperheater Installation ............................................................................................................................ 29
Figure 4 – Alternate Desuperheater Installation ........................................................................................................... 29
XI. Troubleshooting............................................................................................................................................................. 30
XII. WIring Diagram.............................................................................................................................................................. 36
Standard Models with Optional Desuperheater ............................................................................................................... 36
XIII. Warranty Claim and registration forms......................................................................................................................... 37
XIV. Equipment start up Form and Process .......................................................................................................................... 39

3

4
II. KEY & LEGEND
KEY TO MODEL NUMBERS
LEGEND FOR TABLES
BTU/hr
Heating or cooling capacity
GPM
Gallons Per Minute
CAP
Capacity
HE
Heat Extracted
COP
Coefficient of performance (BTU/hr out : BTU/hr in)
HR
Heat Rejected
CFM
Cubic feet per minute
HYD
Hydronic
DB
Dry-bulb entering air temperature
kW
Kilowatt
DEWT
Demand Entering Water Temperature
LLTC
Liquid Line Temperature Cooling
DHW
Demand Hot Water
LLTH
Liquid Line Temperature Heating
DLWT
Demand Leaving Water Temperature
LRA
Locked-rotor amperage
dP
Pressure drop across heat pump
LWT
Leaving water temperature
DSH
Desuperheater
MBTU/hr
Btu/hr x 1000
EER
Energy efficient ratio (BTU/hr CAP : watts in)
RLA
Rated-load amperage
EWT
Entering water temperature
SLT
Suction Line Temperature
FLA
Full-load amperage
VA
Volt-amperes
GND
Ground
WB
Wet-bulb entering air temperature

5
III.WARNINGS & CAUTIONS
Note – Always refer to the inside of the lower
front door for the correct wiring diagram, and
always refer to the nameplate on the exterior of
the cabinet for the correct electrical
specifications.
WARNING – Service of refrigerant-based
equipment can be hazardous due to elevated
system pressures and hazardous voltages. Only
trained and qualified personnel should install,
repair or service. Installer is responsible to ensure
that all local electrical, plumbing, heating and air
conditioning codes are followed.
WARNING – ELECTRICAL SHOCK CAN
CAUSE PERSONAL INJURY OR DEATH.
Disconnect all power supplies before installing or
servicing electrical devices. Only trained and
qualified personnel should install, repair or
service this equipment.
WARNING – THE UNIT MUST BE
PROPERLY GROUNDED!
The main electrical service must be protected by a
fuse or circuit breaker and be capable of
providing the amperes required by the unit at
nameplate voltage. All wiring must comply with
the national electrical code and/or any local codes
that may apply. Access to the line voltage
contactor is through the knockouts provided on
the side of the heat pump as labeled. Route EMT
or flexible conduit with appropriate size and type
of wire.
Ensure adequate supply wiring to minimize the
level of dimming lights during compressor
startup on single-phase installations. Some
dimming is normal upon compressor start-up.
CAUTION – Route field electrical wiring to
avoid contact with electrically live bare metal
parts inside the electrical box.
CAUTION – Three-phase units must be wired
properly to ensure proper compressor rotation.
Improper rotation may result in compressor
damage. An electronic phase sequence indicator
must be used to check supply-wiring phases.
Also, the “Wild” leg of the three-phase power
must be connected to the middle leg on the
contactor.
WARNING –Verify refrigerant type before
servicing. The nameplate on the heat pump
identifies the type and the amount of refrigerant.
All refrigerant removed from these units must be
reclaimed by following accepted industry and
agency procedures.
CAUTION – Ground loop must be freeze
protected. Insufficient amounts of antifreeze may
cause severe damage and will void warranty.
Loop antifreeze must be non-flammable. Never
operate with ground loop flow rates less than
specified. Continuous operation at low flow or no
flow may cause severe damage and may void
warranty.
Note – These units feature braze-plate heat
exchangers. Enertech requires that a strainer be
installed on the water inlet of the source circuit. A
strainer with a size of 16-20 mesh minimum
should be used. For your convenience a strainer
and connection hardware have been included
with the unit.
IV. GENERAL INFORMATION
INSPECTION
Equipment should be inspected upon receipt to
assure that damage has not occurred during
shipment of the unit. Carefully check the shipping
company bill of lading against the packing slip to
verify that all units and accessory packages have
been received. Inspect each package for physical

6
damage and ensure that the carrier makes
notation of any damage or missing packages on
bill of lading records. Pictures of any damage are
recommended. Concealed damage should be
reported to the shipping company immediately.
STORAGE
Unit should be stored in a clean, dry location in
the original shipping packaging. Units shall be
stored in an upright position and should not be
stacked unless noted on the shipping packaging.
PROTECTION
Units should be protected when on the building
site from damage and contamination. Keep units
covered or in original shipping packaging during
job site construction. All physical connections (air
supply and return, piping, electrical) should be
protected and covered/capped prior to
installation.
PRE-INSTALLATION PREPARATION
Care should be taken to assure that the
installation of the geothermal unit is successful.
Locate the unit where there is adequate
ventilation and room for servicing. Units should
be placed on a level surface on a vibration–
absorbing pad slightly larger than the base of the
unit. Care should be taken to use the proper duct
size, piping is not hard-plumbed to the unit, and
any sound or vibration is not transmitted into the
surroundings.
Units are designed for indoor installation only
where the ambient temperature remains above
45°F. Do not use the heat pump for initial heating
of the building during construction.Operating the
heat pump during construction or renovation will
subject the unit to contamination, potentially
resulting in failure of the unit. Starting the heat
pump in a cold environment may flush lubricant
from the compressor resulting in compressor
damage and ultimately, unit failure.
•Review the electrical data on the nameplate to
assure that the correct unit has been shipped
•Carefully remove any packing material from
the outside and inside of the unit and inspect
for any concealed damage
•Inspect electrical connections for cleanliness
and attachment
•Inspect liquid connections to assure that any
debris has been removed and caps are
removed as appropriate.
V. BEST PRACTICES
SYSTEM SIZING
Selecting the unit capacity of a geothermal heat
pump requires three things:
•Building Heat Loss / Heat Gain.
•Ground Sources and Design Water Temperatures.
•Temperature Limitations.
BUILDING HEAT LOSS/HEAT GAIN
The space load must be estimated accurately for
any successful HVAC installation. There are
many guides or computer programs available for
estimating heat loss and gain, including the
Manual J, and others. After the heat loss and gain
analysis is completed, Entering Water
Temperatures (EWT’s) are established, and
heating conditions are determined. The heat
pump can now be selected using the heat pump
data found in the Engineering Specifications
section. Choose the capacity of the heat pump
based on both heating and cooling loads.

7
GROUND SOURCES AND DESIGN WATER
TEMPERATURES
Ground sources include the Ground Water
(typically a well) and the Ground Loop varieties.
Water flow-rate requirements vary based on
configuration. The Engineering Specifications
section provides capacities at different loop
entering water temperatures and entering air
temperatures.
GROUND LOOP SYSTEMS
Loop systems use high-density polyethylene pipe
buried underground to supply a tempered water
solution back to the heat pump. Ground loops
operate at higher flow rates than ground water
systems because the loop Entering Water
Temperature (EWT) is lower. EWT affects the
capacity of the unit in both heating and cooling
modes, and loops in cold climates are normally
sized to supply wintertime EWT to the heat pump
down to 25°F.
GROUND WATER SYSTEMS
See Figure 3
Note – If a heat pump is installed with ground
water, it should have a Cupro-Nickel (CuNi)
water coil. Cupro-Nickel water coils withstand
well water much better than standard copper
water coils.
TEMPERATURE LIMITATIONS
Be aware of the operating range of the geothermal
system when sizing the particular heat pump to
avoid premature equipment failure. Operating
outside of these limitations may cause severe
damage to the equipment and may void
warranty.
CAUTIONS: Reference tables in engineering
section for acceptable operating conditions.
System design
GROUND SOURCE DESIGN
GROUND LOOP INSTALLATION
A Ground Loop system circulates the same
antifreeze solution through a closed system of
high-density underground polyethylene pipe. As
the solution passes through the pipe, it collects
energy (in the heating mode) from the relatively
warm surrounding soil through the pipe and into
the relatively cold solution. The solution
circulates to the heat pump, which transfers
energy with the solution, and then the solution
circulates back through the ground to extract
more energy.
CAUTION – Ground Loops must be properly
freeze protected. Insufficient amounts of
antifreeze may result in a freeze rupture of the
unit or can cause unit shutdown problems during
cold weather operation. Propylene glycol is a
common antifreeze solution. Propylene glycol
antifreeze solution should be mixed 25% with
water to obtain a 15°F freeze protection.
Enertech’s proprietary Geothermal Transfer
Fluid (GTF) is methanol-based antifreeze and
should be mixed 50% with water to achieve freeze
protection of 12°F.
Important – Do not mix more than 25%
propylene glycol with water in an attempt to
achieve lower than 15°F freeze protection, since
more concentrated mixtures of propylene glycol
become too viscous at low temperatures and will
become more difficult to pump through the earth
loop. Horizontal loops typically use GTF, and
vertical loops typically use propylene glycol.
Note – Always check State and Local codes for any
special requirements on antifreeze solutions.

8
CAUTION – Never operate with flow rates less
than specified. Low flow or no flow may cause
the unit to shut down on a pressure lockout or
may cause a freeze rupture of the heat exchanger.
Important– Installation of
Pressure/Temperature (P/T) ports in the entering
and leaving water line of the heat pump is
recommended (see figure 2). A thermometer can
be inserted into the P/T ports to check entering
and leaving water temperatures. A pressure
gauge can also be inserted into these P/T ports to
determine the pressure differential between the
entering and leaving water. This pressure
differential can then be compared to the
specification data on each particular heat pump to
confirm the proper flow rate of the system.
An individually-sized Enertech Flow Center can
supply pumping requirements for the Ground
Loop fluid.
Note – Refer to instructions included with the
Flow Center for properly purging the ground
loop.
Filling and purging a loop system are very
important steps to ensure proper heat pump
operation. Each loop must be purged with
enough flow to ensure two feet per second flow
rate in each circuit in the loop. This normally
requires a 1½ to 3 HP high-head pump to
circulate fluid through the loop to remove all the
air out of the loop. Allow the pump to run 10 to
15 minutes after the last air bubbles have been
removed. After purging is completed, add the
calculated proper amount of antifreeze to give a
12°F to 15°F freeze protection. Always pump
away from coil or into the earth loop. After
antifreeze has been installed and thoroughly
circulated, it should be measured with a
hydrometer (methanol), refractometer (propylene
glycol), or Enertech methanol anti-freeze tester to
determine the actual freezing point of the
solution.
The purge pump can be used to pressurize the
system for a final static pressure of 30-40 psig
after the loop pipe has had enough time to stretch.
In order to achieve the 30 to 40 psig final pressure,
the loop may need to be initially pressurized to
60-65 psig. This static pressure may vary 10 psig
from heating to cooling season, but the pressure
should always remain above 20 psig, to ensure
circulation pumps do not cavitate or pull air into
the system. Contact your local installer,
distributor or factory representative for more
information.
GROUND WATER INSTALLATION
Since water is the source of energy in the winter
and the energy sink in the summer, a good water
supply is possibly the most important
requirement of a geothermal heat pump system
installation.
A Ground Water system gets its name from the
open discharge of water after it has been used by
the heat pump. A well must be available that can
supply all of the water requirements of the heat
pump for up to 24 hours/day on the coldest
winter day plus any other water requirements
drawing off of that same well. A bladder type
pressure tank with a “draw down” of at least 1 ½
times the well pump capacity must be installed on
the supply side of the heat pump.
Note – These units feature braze-plate heat
exchangers. Enertech requires that a strainer be
installed on the water inlet of the source circuit. A
strainer with a size of 16-20 mesh minimum
should be used. For your convenience a strainer
and connection hardware have been included
with the unit.

9
Important – It is highly recommended that
Pressure/Temperature (P/T) ports be placed in the
supply and discharge lines so that thermometers
or pressure gauges can be inserted into the water
stream.
Important – It is highly recommended that a
visual flow meter be installed to allow visual
inspection of the flow. If flow meter appears
cloudy the water coil may need to be cleaned.
A solenoid control valve must be installed on the
water discharge side of the heat pump to regulate
the flow through the unit.
Schedule 40 PVC piping, copper tubing,
polyethylene or rubber hose can be used for
supply and discharge water lines. Make sure line
sizes are large enough to supply the required flow
with a reasonable pressure drop (generally 1”
diameter minimum). Consult local plumbing
codes to ensure compliance.
CAUTION – Never operate with flow rates less
than specified. Low flow rates, or no flow, may
cause the unit to shut down on a pressure lockout
or may cause a freeze rupture of the heat
exchanger. If unit is operated without flow
warranty with be voided.
GROUND WATER FREEZE PROTECTION
CAUTION – Only equipment ordered with a
CuNi coil shall be used on ground water
applications. These units are provided with
freeze protection.
APPLICATION DIAGRAMS
Figures 1 through 4, show the components of a
heat pump system discussed above used in some
common applications. These figures by no means
represent all the possible heat pump applications,
but they do show important principles that can be
applied to any system.
UNIT LOCATION/MOUNTING
CAUTION – Units must be kept in an upright
position during transportation or installation, or
severe internal damage may occur. Never
transport a heat pump on its side or back.
CAUTION – Do not use this unit during
construction. Dust and debris may contaminate
electrical and mechanical components; resulting
in damage.
Important – To ensure easy removal and
replacement of access panels, leave panels
secured in place until the unit is set in place and
leveled.
Important – Locate the unit indoors where
ambient temperature remains above 45°F. Service
is primarily from the front. Rear and side access
should be provided when possible, 12” clearance
on all sides is desirable.
Important – A field installed drain pan is
required under the entire unit if accidental water
discharge could damage surrounding floors,
walls or ceilings. Check local codes for
compliance.
CAUTION – Do not mount components or
pipe to the exterior of the heat pump cabinet.
Important – Units must be mounted on a
vibration absorbing pad slightly larger than the
base to provide isolation between unit and floor.
Water supply pumps shall not be hard plumbed
directly to the unit with copper pipe; this could
transfer vibration from the water pump to the
refrigeration circuit, causing a resonating sound.
Flexible water connection use is recommended to
eliminate transfer of vibration wherever possible.

10
CAUTION – Always use plastic male fittings
into plastic female or into metal female fittings.
Never use metal male fittings into plastic female
fittings. On metal-to-metal fittings; use pipe
thread compound, do not use pipe thread tape.
Hand tighten first, and then only tighten an
additional ½ turn with a tool if necessary. On
plastic fittings, always use 2 to 3 wraps of pipe
thread tape, do not use pipe thread compound.
Hand tighten first, then only an additional ½ turn
with a tool if necessary. Do not over-tighten, as
damage may occur.
Important – Install with constant downward
slope.
VI. ELECTRICAL
Note – Always refer to the inside of the front
panel for the correct wiring diagram and guide to
LEDs.
Important – If external controls require more
power than shown in the engineering
specification, external transformer & isolation
relays should be used.
Important – Miswiring of 24Vac control voltage
on system controls can result in transformer
burnout.
Important – Units with dual voltage rating
(example, 208/230) are factory-wired for the
higher voltage (example, 230). If connected to
power supply having the lower voltage, change
wiring to transformer primary to the correct lead;
otherwise premature failure, or inability to
operate the control components may occur.
CONTROLLER
The controller is designed to provide high
reliability in controlling numerous operating
functions of geothermal heat pumps with space
heating, space cooling, desuperheater and
dedicated domestic water heating. This controller
switches control devices by reviewing the various
control inputs and temperature information,
making decisions based on operation priority.
Power up Initialization
When system powers up, there is a random start
up time of 30-90 seconds. Once per second, the
controller will examine process inputs, execute
the control algorithm for the system, and update
the process outputs.
All Possible Combinations of Room Thermostat Inputs (24 VAC)
Mode
Operation Inputs
Y1
Y2
O
G
W1 W2
Fan Only
x
Heating 1st Stage
x
x
Heating 2nd Stage
x
x
x
x
x
Heating Auxillary
x
x
x
x
Heating 2nd Stage Auxiliary
x
x
x
x
x
Cooling
x
x
x
x
x
x
x
1
st
Stage Emergency Heat
x
x
2nd Stage Emergency Heat
x
x
x
x
x
The heat pump will not run if there is an invalid
thermostat call and the LEDs will be illuminated,
see LED section.
Anti-Short Cycle
Every time the compressor relay is turned off, the
time delay function will prevent the compressor
relay from turning on for a period of 5 minutes.
Reset
A push button located on the control board called
'TEST' is used to shorten the anti-short cycle
progress. The anti-short cycle time is shortened
from 5 minutes to 1 minute. This button, intended
for use only by a qualified service technician,
eliminates the need to wait for the time out period
when cycling in different modes of operation.

11
Fan Operation
The fan has an extended run time of 2 minutes. If
the thermostat/fan has an internal fan extended
run time, the fan could potentially run for longer
than 2 minutes once the G call is satisfied.
ECM Fan Speed Control
The controller has the ability to change the ECM
Fan Speed. Refer to the CFM table in the
Engineering Specifications for specific CFM taps.
Using +/- Taps will adjust all CFM values + or -
10%.
Reversing Valve Control
Every time the compressor relay output is turned
off following cooling operation, reversing valve
will stay energized 90 seconds. This allows
system pressure to equalize prior to de-energizing
reversing valve. After a heating call, reversing
valve will be energized & de-energized 90
seconds after compressor output is turned off.
Switching the reversing valve after each run cycle
keeps it well lubricated and operational.
Desuperheater Operation
The controller monitors desuperheater
temperatures allowing unit equipped with
desuperheater to operate most efficiently. Refer to
the Desuperheater section for more information
about Desuperheater controls.
Dip Switches
The dip switches mounted on the controller board
allow the installer to select various features for
operating the unit. Once the dip switch position is
changed, power must be reset in order for the
change to register on the control board.
The dip switches are listed below.
Main Board
Designator Description Dipswitch On
Dipswitch
Off
FRZ Freeze Protection 17°F 35°F
STG2Single or Two
Stage Compressor Two Stage Single Stage
DSH Enable/Disable
Desuperheater Enabled Disabled
PMP Loop Pumps Together Separate1
HYD2Water-to-Water or
Water-to-Air
Water-to-
Water Water-to-Air
1See Ground Loop Pump operation for more information.
2Used for internal software to verify board configuration w/model
number.
Explanation of Dip Switch Settings
SMP - Sampling Mode
In the OFF position, this selection commands the
hot water circulating pump to turn on every five
minutes to circulate water from the hot water
storage tank to the heat pump. At the end of a 2
minute period (sampling of the water
temperature), if the temperature of the water
entering the heat pump is equal to or less than the
programmed cut-in temperature after 2 minutes
of continuous circulation, water heating mode is
initiated.
In the ON position, the pump will run
continuously, similarly the water will be sampled
continuously. See priority settings & operation for
more information.
STG-Ground Loop Pump Operation
Water circulating pumps used to circulate an
antifreeze solution can be staged by the controller
to cycle on one or more pumps at different
entering water temperatures.
Loop pump relay #1 is the primary pump control.
It is energized whenever there is a call for space
heating, space cooling, and water heating.

12
Staging Control
In the space heating mode, as fluid temperature
declines in the winter, more flow (gpm) is
required to provide more heat transfer from the
ground to the heat pump. Likewise, in the space
cooling mode, as fluid temperature increases,
more flow (gpm) is required to remove heat from
the heat pump to the ground.
Energy savings are increased because the heat
pump can cycle off one or more pumps when
they are not needed.
Heating Operation (Thermostat or DHW)
Ground loop pump #2 will turn on once the
entering water temperature falls below 60°F.
Pump #2 will turn off once the temperature rises
to 65° F. Pump #2 will turn on/off “on the fly”.
EWT is continually checked during operation.
Cooling Operation
Ground loop pump #2 will turn on once the
entering water temperature rises above 60°F.
Pump #2 will turn off once the temperature falls
to 55° F. Pump #2 will turn on/off “on the fly”.
EWT is continually checked during operation.
LED LIGHTS
PWR LED
Solid illumination of this light indicates that the
control board is functioning properly. During the
random start period the LED will be flashing. No
light may indicate loss of power to board.
Voltage must be 18VA - 32VA.
Mode of Operation LED Lights
Mode of Operation LED lights (three) in addition
to the PWR LED, aid in troubleshooting and
indicating the mode of operation. While a mode is
running the LED will be illuminated solid. If a
mode is waiting to run for the anti-short cycle
period the LED will be flashing.
Heating - Space Heating or Electric Heat
Operation
Cooling - Space Cooling Operation
Service LED Lights
Service LED lights (five) in addition to the PWR
and Mode LEDs, aid in troubleshooting.
High DGT - Hot refrigerant gas
High Pressure - Excessive refrigerant pressure
Low Pressure - Refrigerant pressure too low
Freeze - LWT below setpoint
Overflow - Drain pan filled with water
Guide to LEDs
LED
Illuminated
Action Status
PWR
Flashing
Random Start Up Time - wait.
Solid
Power to Unit
HEATING
Solid
Running Heating and/or Auxiliary
Heat
Flashing
1. Waiting to run Heating and/or
Auxiliary Heat
2. Soft lockout - hold DIAG button for
2 seconds. Lockout LED will be
illuminated if soft lockout.
COOLING
Solid
Running Cooling
Flashing
1. Waiting to run Cooling
2. Soft lockout - hold DIAG button for
2 seconds. Lockout LED will be
illuminated if soft lockout.
HEATING &
COOLING &
DEMAND
HOT WATER
Flashing
- all Invalid Input from Thermostat
HEATING &
Service LED Solid -
both
Hard Lockout - type of lockout LED
Illuminated occurred while Heating
was running.
COOLING &
Service LED Solid -
both
Hard Lockout - type of lockout LED
Illuminated occurred while Cooling
was running.
Service LED
Flashing
Without
Mode
LEDs
Flashing
Thermistor Error
1. If FREEZE - LWT Error
2. If LOW PRESSURE - EWT Error
3. If High DGT - DGT Error
4. If OVERFLOW - DEWT Error
Soft and Hard Safety Lockouts
On occasion, the unit’s operating conditions may

13
exceed the parameters set for normal operation.
This means that the unit could lock out on a safety
control, thus preventing the unit from operating.
To restore operation, a qualified service
technician must service the unit.
To eliminate nuisance lockouts as a result of high
or low pressure safety trips, the controller has the
ability to allow more than one lockout (soft
lockout) before it decides to permanently lock out
(hard lockout) the mode of operation in which the
lockout occurred.
For example, when the high pressure lockout
occurs in heating mode for the third time in a
period less than 90 minutes, the heating mode
will be disabled until a manual reset is performed.
High & Low Pressure Lockout
The High or Low Pressure LED is illuminated
once a Hard Lockout occurs. A hard lockout is
defined as; high or low pressure switch has been
activated 3 times within 90 minutes. Once the
high or low pressure switch is activated, the unit
is shut down and soft lockout is triggered. The
unit will be shut down for 15 minutes. At which
time it will attempt to run again if there is a
thermostat input. If a hard lockout occurs power
must be reset in order to clear the lockout.
Discharge Gas Temperature (DGT) Lockout
The discharge gas refrigerant temperature is
continually monitored and when hot gas
temperature rises above 250°F a soft lockout is
initiated and the unit is shut down. Unit will be
shut down for 15 minutes, at which time it will
attempt to run again if there is a thermostat input
and the DGT temperature is below 200°F. If DGT
reaches 250°F 3 times in a 90 minute period a hard
lockout will be set requiring a manual power
reset.
Overflow Lockout
Once the overflow sensor is triggered a hard
lockout will be set requiring a manual power
reset.
Freeze Lockout
Freeze protection lockout occurs when the leaving
water temperature falls below the set point of
LWT. At which time a soft lockout is initiated and
the compressor is shut down. The ground loop
pump remains on for 15 minutes. The unit will
attempt to run again if there is a thermostat input
and the LWT rises 7°F above set point. If a freeze
lockout is initiated 3 times in a 90 minute period a
hard lockout will be set requiring a manual power
reset.
Active Control Panel
All LED lights are also located on the Membrane.
The TEST button is located on the membrane at
the top left corner or on the left below the service
LEDs. The DIAG button is located on the
membrane at the top right corner or on the right
below the “t” in Enertech.
VII. HEAT PUMP COMMISSIONING
Before applying power to the heat pump, check
the following items:
•Water supply plumbing to the heat pump is
completed and operating. Manually open the
water valve on well systems to check flow.
Make sure all valves are open and air has been
purged from a loop system. Never operate the
system without correct water supply flow.
•All high voltage and all low voltage wiring is
correct and checked out, including wire sizes,
fuses and breakers. Set system to the “OFF”
position.

14
Note – The heat pump is located in a warm
area (above 45°F). (Starting the system with
low ambient temperature conditions is more
difficult and may cause low-pressure lockout.)
Do not leave the area until the space is
brought up to operating temperatures.
Commissioning
The controller has the ability to perform a system
check on all modes using the Commissioning
process.
Run this process at the end of each installation -
data will be stored in the controller.
1. Reset Power.
2. Hold the TEST button for 15 seconds.
PWR & Cooling LED will begin flashing.
3. Cooling will be run for 15 minutes.
4. Unit idle for 3 minutes while Heating LED
flashing.
5. Heating will be run for 15 minutes.
6. Unit idle for 3 minutes.
7. If equipped with Desuperheater - the
Desuperheater will run for 15 minutes.
Unit will run in Heating mode.
8. Once complete the following LEDs will be
illuminated:
a. Power – Off
b. Heating – On
c. Cooling - On
d. Demand Hot Water – On
9. Hold TEST button for 5 seconds or power
reset to resume normal operation.
MAINTENANCE
Properly installed, the Enertech heat pump
requires only minor maintenance such as periodic
cleaning of the ground water heat exchanger for
heat pumps installed in ground-water
applications. Setting up regular service checkups
with your Enertech dealer should be considered.
Any major problems with the heat pump system
operation will be indicated on the lockout lights.
CAUTION – During evacuation of refrigerant
of a system not having antifreeze protection of the
ground-side, water in the unprotected heat
exchanger must be removed or continuously
flowing to avoid a potential heat exchanger
failure caused by freeze rupture.
Important – Always install a new filter/drier
after replacing a refrigeration component
(compressor, etc.).
The Enertech controller (and a room thermostat, if
part of the system installation) will display a
system lockout. If lockout occurs, follow the
procedure below:
1. Determine and record which indicator lights
on the controller are illuminated. (Refer to
Troubleshooting Section for more information
on possible causes of Lockout Conditions.)
2. Check for correct water supply from the
ground loop or ground water system.
3. Reset the system by disconnecting power at
the circuit breaker for one minute and then
reapplying.
4. If shutdown reoccurs, Call your Enertech
dealer. Do not continuously reset the lockout
condition or serious damage may occur.
Note – Improper fluid flows or incorrect
antifreeze levels are the cause of almost all
lockouts.
VIII. ACCESSORIES
ROOM THERMOSTAT
Installations may include a wide variation of
available electronic room thermostats, and most
of them must be configured by the Installer and
checked out after installation. For the number of

15
wires required or other questions, please refer to
the installation manual that was sent with the
thermostat.
DESUPERHEATER
A heat pump equipped with a double-wall vented
desuperheater can provide supplemental heating
of domestic hot water by stripping some energy
from the superheated gas leaving the compressor
and transferring it to a hot water tank. A built in
desuperheater pump circulates water from the
domestic hot water tank, heats it and returns it to
the tank.
The desuperheater only provides supplemental
hot water when the compressor is running to
condition space. Because the desuperheater is
using some energy from the heat pump to heat
water, the heat pump’s capacity in the winter is
about 10% less than a unit without a
desuperheater. The desuperheater can be disabled
with a dip switch on the control board.
The control board has the ability to control
desuperheater operation. The desuperheater will
operate once the entering desuperheater
temperature is below 120°F and the compressor is
energized. The desuperheater will continue to run
until the DEWT reaches 130°F, at which point
operation will end.
Desuperheater operation is ended once an
auxiliary heat call is made.
The desuperheater can be enabled or disabled
with a dipswitch on the control board. Refer to
Control Section.
WARNING– The desuperheater high
temperature cutout switch is located on the return
line from the water heater and is wired in series
with the desuperheater pump to disable it from
circulating at entering water temperatures above
140°F. If tank temperatures become
uncomfortably hot, move this switch to the
leaving water line, which will reduce the tank
maximum temperatures 10°F to 15°F.
CAUTION– Running desuperheater pump
without water flow will damage the pump. A
fuse is attached to the fuse holder and must be
inserted in the fuse holder after the
desuperheater is purged and operational.
Important – Do not insert the fuse until water
flow is available and the desuperheater is
completely purged of air, or the pump may be
damaged.
All air must be purged from the desuperheater
plumbing before the pump is engaged. To purge
small amounts of air from the lines, loosen the
desuperheater pump from its housing by turning
the brass collar. Let water drip out of the housing
until flow is established, and re-tighten the brass
collar. Using 1/2-inch copper tubing or larger
from the tank to the desuperheater inlet is
recommended to allow proper water flow. An air
vent in the inlet line can also help systems where
air is a problem. If one is used, mount it near the
desuperheater inlet roughly 2-1/2 inches above
the horizontal pipe. Shutoff valves allow access to
the desuperheater plumbing without draining the
hot water tank. Keep the valves open when the
pump is running.
Hot water tank maintenance includes periodically
opening the drain on the hot water tank to
remove deposits. If hard water, scale, or buildup
causes regular problems in hot water tanks in
your area, it may result in a loss of desuperheater
effectiveness. Cleaning may be required.
CAUTION – Insulated copper tubing must be
used to run from the water tank to the
desuperheater connections on the side of the unit.

16
Desuperheater must be plumbed in copper
tubing.
The built-in desuperheater pump can provide the
proper flow to the desuperheater if the total
equivalent length of straight pipe and connections
is kept to a maximum of 90 feet of 1/2-inch type L
copper tubing (or a combination of approximately
60 feet with typical elbows and fittings). This
tubing can be connected to the water tank in two
ways:
METHOD 1
Using a desuperheater tee installed in the drain at the
bottom of the water heater This is the preferred
method for ease of installation, comfort and
efficiency. The tee eliminates the need to tap into
the domestic hot water lines and eliminates
household water supply temperature variations
that could occur from connecting to the hot water
pipes. Poor water quality may restrict the
effectiveness of the desuperheater tee by plugging
it with scale or buildup from the bottom of the
tank, restricting water flow.
METHOD 2
Taking water from the bottom drain and returning it
to the cold water supply line This method maintains
the same comfort and efficiency levels but
increases installation time and cost.
Important – This method requires a check valve
in the return line to the cold water supply to
prevent water from flowing backwards through
the desuperheater when the tank is filling. Water
passing through the pump backwards damages
the rotor's bearing, which reduces pump life and
causes noise problems in the pump. Note – A
spring-type check valve with a pressure-drop
rating of 1/2 psig or less is recommended.

17
IX. ENGINEERING SPECIFICATIONS
PERFORMANCE RATINGS
3 TON PERFORMANCE RATINGS
Heating Performance Data (Tested in accordance with ASHRAE/AHRI/ ISO Standard 13256-1)
Operating
Mode Application
Source
EWT (°F)
Entering GPM
(source)
Total Heat
Output (MBH) CFM COP
Full Load
Ground Water
50°F
8
45,400 1100 3.9
Ground Loop
32°F * 37,200 1100 3.6
Part Load
Ground Water
50°F 33,300 900 4.2
Ground Loop
41°F 29,900 900 3.9
* Antifreeze required
Cooling Performance Data (Tested in accordance with ASHRAE/AHRI/ ISO Standard 13256-1)
Operating
Mode Application
Source
EWT (°F)
Entering GPM
(source)
Total Cooling
Output (MBH) CFM EER
Full Load
Ground Water
59°F
8
35,600 900 27.0
Ground Loop
77°F 34,700 900 21.5
4 TON PERFORMANCE DATA
Heating Performance Data (Tested in accordance with ASHRAE/AHRI/ ISO Standard 13256-1)
Operating
Mode Application
Source
EWT (°F)
Entering GPM
(source)
Total Heat
Output (MBH) CFM COP
Full Load
Ground Water
50°F
10
54,000 1450 3.9
Ground Loop
32°F * 43,300 1350 3.4
Part Load
Ground Water
50°F 37,900 1100 4.3
Ground Loop
41°F 33,800 1040 3.8
* Antifreeze required
Cooling Performance Data (Tested in accordance with ASHRAE/AHRI/ ISO Standard 13256-1)
Operating
Mode Application
Source
EWT (°F)
Entering GPM
(source)
Total Cooling
Output (MBH) CFM EER
Full Load
Ground Water
59°F
10
49,400 1100 25.9
Ground Loop
77°F 46,800 1100 22

18
5 TON PERFORMANCE DATA
Heating Performance Data (Tested in accordance with ASHRAE/AHRI/ ISO Standard 13256-1)
Operating
Mode Application
Source
EWT (°F)
Entering GPM
(source)
Total Heat
Output (MBH) CFM COP
Full Load
Ground Water
50°F
12
60,300 1700 4.0
Ground Loop
32°F * 52,500 1700 3.5
Part Load
Ground Water
50°F 48,100 1400 4.2
Ground Loop
41°F 43,000 1400 3.7
* Antifreeze required
Cooling Performance Data (Tested in accordance with ASHRAE/AHRI/ ISO Standard 13256-1)
Operating
Mode Application
Source
EWT (°F)
Entering GPM
(source)
Total Cooling
Output (MBH) CFM EER
Full Load
Ground Water
59°F
12
51,300 1400 25.1
Ground Loop
77°F 51,100 1400 19.6

19
PERFORMANCE DATA
3 TON FULL LOAD HEATING & COOLING PERFORMANCE DATA
* Operation at 40°EWT for long periods of time in Cooling is not recommended, this is an extreme operating condition.
Data subject to change.
Pressure: Suction +/- 5 psig & Discharge P +/- 10 psig.
Pressure Drops with pure water.
Ground
Cooling
EAT 80.6°F DB & 66.2°F WB
Heating
EAT 68°F DB
EWT
°F GPM
dP
psig dP ft
Airflow
CFM
Total
Capacity
Sensible
Capacity KW EER
Suction
Pressure
Discharge
Pressure
Airflow
CFM
Total
Capacity
Sensible
Capacity
KW COP
Suction
Pressure
Discharge
Pressure
20
8 2.0 4.6
Operation Not Recommended
1100 31.1 23.4 2.6 3.3 65 330
10 3.8 8.8 1100 31.4 23.6 2.6 3.4 70 335
12 5.3 12.2 1100 31.8 23.9 2.7 3.4 70 340
30
8 2.0 4.6 1100 37.4 28.1 2.8 3.5 80 360
10 3.8 8.8 1100 37.8 28.4 2.9 3.7 85 365
12 5.3 12.2 1100 38.2 28.7 2.9 3.7 85 425
40*
8 2.0 4.6 900 39.2 27.1 1.0 36.5 105 145 1100 42.3 31.8 3.0 3.8 85 370
10 3.8 8.8 900 39.7 27.4 1.0 39.8 100 145 1100 42.7 32.1 3.1 3.9 95 365
12 5.3 12.2 900 40.0 27.6 1.0 39.9 100 120 1100 43.5 32.7 3.1 3.9 95 370
50
8 2.0 4.6 900 38.4 26.5 1.1 32.8 115 180 1100 45.7 34.3 3.2 4.0 110 420
10 3.8 8.8 900 38.7 26.7 1.1 35.6 115 175 1100 46.1 35.8 3.3 4.0 110 425
12 5.3 12.2 900 39.2 27.0 1.2 35.8 120 150 1100 47.0 36.5 3.3 4.1 120 470
60
8 2.0 4.6 900 37.5 25.7 1.2 28.9 120 215 1100 50.9 39.5 3.4 4.2 125 450
10 3.8 8.8 900 37.9 26.3 1.2 31.6 125 210 1100 51.6 40.0 3.5 4.3 125 460
12 5.3 12.2 900 38.2 26.2 1.3 31.6 125 185 1100 53.0 41.1 3.5 4.3 135 505
70
8 2.0 4.6 900 34.6 23.7 1.4 21.4 125 240 1100 56.3 43.7 3.5 4.4 140 480
10 3.8 8.8 900 37.0 25.5 1.4 27.4 125 240 1100 57.0 44.3 3.6 4.6 145 485
12 5.3 12.2 900 37.4 25.6 1.5 27.5 130 210 1100 58.9 45.8 3.6 4.6 150 530
80
8 2.0 4.6 900 34.5 23.6 1.7 19.8 135 245 1100 62.2 48.3 3.7 4.6 160 545
10 3.8 8.8 900 34.8 23.9 1.7 20.2 135 240 1100 63.0 48.9 3.7 4.7 165 550
12 5.3 12.2 900 35.1 24.0 1.7 20.6 140 235 1100 65.4 50.8 3.8 4.7 170 602
90
8 2.0 4.6 900 33.6 23.0 1.8 16.2 140 275
Operation Not Recommended
10 3.8 8.8 900 33.9 23.3 1.8 16.6 155 275
12 5.3 12.2 900 34.3 23.5 1.8 16.9 155 270
100
8 2.0 4.6
Operation Not Recommended
10 3.8 8.8
12 5.3 12.2
110
8 2.0 4.6
10 3.8 8.8
12 5.3 12.2
120
8 2.0 4.6
10 3.8 8.8
12 5.3 12.2