Enertech® Console
(ERC) Series
Table of Contents
Model Nomenclature: Enertech® Console
3
(ERC) Series
General Information
Unit Physical Data
6
Installation
7
Piping Connections - ERC Size 06-15
Commercial Console
Water-Source Heat Pumps
Installation, Operation
& Maintenance
97B0035N09
Created: September 1, 2017
4
9
Piping Connections - ERC Size 18
10
Piping Connections
11
Water-Loop Heat Pump Applications
12
Ground-Loop Heat Pump Applications
13
Ground-Water Heat Pump Applications
14
Water Quality Standards
16
Electrical - Line Voltage
17
Electrical - Low Voltage
20
ERC Series Wiring Diagram Matrix
22
CXM Controls
23
DXM Controls
24
Safety Features - CXM/DXM Controls
26
Unit Commissioning and Operating Conditions
28
Piping System Cleaning and Flushing
29
Unit and System Checkout Procedure
30
Unit Start-Up Procedure
31
Unit Operating Conditions
32
Start-Up Log Sheet
34
Preventive Maintenance
35
Functional Troubleshooting
36
Performance Troubleshooting
37
Troubleshooting Form
38
Revision History
40
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
This Page Intentionally Left Blank
2
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Model Nomenclature: Console (ERC) Series
1 2 3
4 5
6
8
7
9
10
11
12
13
14
15
ER C 0 9 B G C A S S C S R S
Piping Connections
ERC = Console
R = Right Piping
L = Left Piping
V = Left Piping w/SS Drain Pan
W = Right Piping w/SS Drain Pan
Unit Size
09, 12, 15, 18
Revision Level
Water Circuit Options
B = Current Revision
Voltage
Controls
OPTION
A
B
D
F
K
X
X
X
X
X
-
F
G
H
J
K
L
V
M
N
P
Q
R
T
W
A = Copper Water Coil w/ e-Coated Air Coil
C = Copper Water Coil
J = Cupro-nickel Water Coil w/ e-Coated Air Coil
N = Cupro-nickel Water Coil
V = Copper Water Coil w/ e-Coated Air Coil & Extended Range Insulation
E = Copper Water Coil w/Extended Range Insulation
M = Cupro-nickel Water Coil w/ e-Coated Air Coil & Extended Range Insulation
F = Cupro-nickel Water Coil w/Extended Range Insulation
POWER TERMINATION & OPTIONS
DISCONNECT
BREAKER
SWITCH
S
A
B
C
D
E
U
Heat Exchanger Options
C = ACO Unit Mounted Tstat w/CXM
D = ACO Unit Mounted Tstat w/DXM
R = Remote Mounted Tstat w/CXM
S = Remote Mounted Tstat w/DXM
L = Remote Mounted w/CXM & LON
M = Remote Mounted w/DXM & LON
N = Remote Mounted w/CXM & MPC
P = Remote Mounted w/DXM & MPC
20 Amp
PLUG &
CORD
Sweat FPT MPT
None
Motorized Water Valve
Autoflow (2.25 Gpm/Ton)
Autoflow (3.0 Gpm/Ton)
Motorized Water Valve & Afr (2.25)
Motorized Water Valve & Afr (3.0)
Secondary Circulation Pump
G = 208-230/60/1
A = 115/60/1
E = 265/60/1
FIELD
CONNECTED
(HARD WIRE)
X
-
Standard
S = Standard
Model Type
RECEPTACLE
X
Subbase
S = 5” Subbase
H = 5” Subbase w/Motorized Damper
N = None
1 = 5” Subbase for Chassis Only
2 = 5” Subbase w/Motorized Damper for Chassis Only
Cabinet Construction
With UltraQuiet
M = Bottom Return
D = Bottom Return w/Locking Control Door
B = Front Return
E = Front Return w/Locking Control Door
C = No Cabinet BR Chassis Only
J = No Cabinet FR Chassis Only
A = Bottom Return w/Extended Cabinet
K = Bottom Return w/Locking Control Door
w/Extended Cabinet
P = Front Return w/Extended Cabinet
Q = Front Return w/Locking Control Door
w/Extended Cabinet
Without UltraQuiet
S = Bottom Return
L = Bottom Return w/Locking Control Door
F = Front Return
G = Front Return w/Locking Control Door
N = No Cabinet BR Chassis Only
H = No Cabinet FR Chassis Only
R = Bottom Return w/Extended Cabinet
T = Bottom Return w/Locking Control Door
w/Extended Cabinet
U = Front Return w/Extended Cabinet
V = Front Return w/Locking Control Door
w/Extended Cabinet
3
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
General Information
Safety
Warnings, cautions, and notices appear throughout this
manual. Read these items carefully before attempting any
installation, service, or troubleshooting of the equipment.
DANGER: Indicates an immediate hazardous situation,
which if not avoided will result in death or serious injury.
DANGER labels on unit access panels must be observed.
WARNING: Indicates a potentially hazardous situation,
which if not avoided could result in death or serious injury.
WARNING!
WARNING! The EarthPure® Application and Service Manual
should be read and understood before attempting to service
refrigerant circuits with HFC-410A.
WARNING!
WARNING! To avoid the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit must be
serviced only by technicians who meet local, state, and
federal proficiency requirements.
WARNING!
CAUTION: Indicates a potentially hazardous situation or
an unsafe practice, which if not avoided could result in
minor or moderate injury or product or property damage.
NOTICE: Notification of installation, operation, or
maintenance information, which is important, but which is
not hazard-related.
WARNING!
WARNING! All refrigerant discharged from this unit must
be recovered WITHOUT EXCEPTION. Technicians must
follow industry accepted guidelines and all local, state, and
federal statutes for the recovery and disposal of refrigerants.
If a compressor is removed from this unit, refrigerant circuit
oil will remain in the compressor. To avoid leakage of
compressor oil, refrigerant lines of the compressor must be
sealed after it is removed.
CAUTION!
CAUTION! To avoid equipment damage, DO NOT use
these units as a source of heating or cooling during the
construction process. The mechanical components and filters
will quickly become clogged with construction dirt and debris,
which may cause system damage.
WARNING! The installation of water-source heat pumps and
all associated components, parts, and accessories which
make up the installation shall be in accordance with the
regulations of ALL authorities having jurisdiction and MUST
conform to all applicable codes. It is the responsibility of
the installing contractor to determine and comply with ALL
applicable codes and regulations.
WARNING!
WARNING! This appliance is not intended for use by persons
(including children) with reduced physical, sensory, or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety.
4
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
General Information
Inspection - Upon receipt of the equipment, carefully
check the shipment against the bill of lading. Make sure
all units have been received. Inspect the packaging of
each unit, and inspect each unit for damage. Insure that
the carrier makes proper notation of any shortages or
damage on all copies of the freight bill and completes a
common carrier inspection report. Concealed damage
not discovered during unloading must be reported to
the carrier within 15 days of receipt of shipment. If not
filed within 15 days, the freight company can deny the
claim without recourse. Note: It is the responsibility of the
purchaser to file all necessary claims with the carrier. Notify
your equipment supplier of all damage within fifteen (15)
days of shipment.
Storage - Equipment should be stored in its original
packaging in a clean, dry area. Store units in an upright
position at all times. Stack units a maximum of 3 units high.
Unit Protection - Cover units on the job site with either
the original packaging or an equivalent protective covering.
Cap the open ends of pipes stored on the job site. In areas
where painting, plastering, and/or spraying has not been
completed, all due precautions must be taken to avoid
physical damage to the units and contamination by foreign
material. Physical damage and contamination may prevent
proper start-up and may result in costly equipment clean-up.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate
with ordering and shipping information to verify that
the correct unit has been shipped.
2. Keep the cabinet covered with the original packaging
until installation is complete and all plastering,
painting, etc. is finished.
3. Verify refrigerant tubing is free of kinks or dents and
that it does not touch other unit components.
4. Inspect all electrical connections. Connections must
be clean and tight at the terminals.
CAUTION!
CAUTION! DO NOT store or install units in corrosive
environments or in locations subject to temperature or
humidity extremes (e.g., attics, garages, rooftops, etc.).
Corrosive conditions and high temperature or humidity can
significantly reduce performance, reliability, and service life.
Always move and store units in an upright position. Tilting
units on their sides may cause equipment damage.
CAUTION!
CAUTION! CUT HAZARD - Failure to follow this caution may
result in personal injury. Sheet metal parts may have sharp
edges or burrs. Use care and wear appropriate protective
clothing, safety glasses and gloves when handling parts and
servicing heat pumps.
Examine all pipes, fittings, and valves before installing
any of the system components. Remove any dirt or debris
found in or on these components.
Pre-Installation - Installation, Operation, and
Maintenance instructions are provided with each unit.
Horizontal equipment is designed for installation
above false ceiling or in a ceiling plenum. Other unit
configurations are typically installed in a mechanical
room. The installation site chosen should include
adequate service clearance around the unit. Before unit
start-up, read all manuals and become familiar with the
unit and its operation. Thoroughly check the system
before operation. Make sure wall behind the unit is flat
and smooth.
5
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Unit Physical Data
Enertech® Console (ERC) Series
Model
09
12
15
Compressor (1 Each)
Factory Charge HFC-410A (oz) [kg]
18
Rotary
28 [0.794]
29 [0.822]
33 [0.907]
39 [1.105]
Blower Wheel
Blower Wheel Size (dia x w) (in) [mm] - Qty 2
5.25 x 6.25 [133 x 159]
Water Connection Size
O.D. Sweat (in) [mm]
1/2 [12.7]
3/4 [19.1]
Optional FPT Fittings (in)
1/2
3/4
Optional MPT Fittings (in)
1/2
3/4
Coax Volume
Volume US Gal
[Liters]
.09
[.34]
.09
[.34]
.23
[.87]
.26
[.98]
Condensate Connection Size
I.D. Vinyl Hose (In) [mm]
5/8 [15.9]
Air Coil Size
Dimensions (h x w) - (in) [mm]
8 x 26
[203 x 660]
10 x 26
[254 x 660]
10 x 32
[254 x 812]
Filter Size
Bottom Return (in) [mm]
1 - 10 x 30 x 1 [254 x 762 x 25]
1 - 10 x 36 x 1 [254 x 914 x 25]
1 - 7 x 29.5 x 1/8 [178 x 749 x 3.2]
1 - 7 x 35.5 x 1/8 [178 x 902 x 3.2]
Bottom Return (Std. 5” Base)
(W x H x D) - (In) [mm]
48 x 26 x 12 [1219 x 660 x 305]
54 x 26 x 12 [1372 x 660 x 305]
Front Return (No Subbase)
(W x H x D) - (In) [mm]
48 x 21 x 12 [1219 x 533 x 305]
54 x 21 x 12 [1372 x 533 x 305]
Front Return (In) [mm]
Unit Size
Unit Weight
Weight - Operating, (lbs) [kg]
175 [79]
180 [82]
190 [86.2]
220 [99.8]
Weight - Packaged, (lbs) [kg]
185 [83.9]
190 [86]
200 [90.8]
232 [105.2]
All units have rubber grommet compressor mountings and TXV expansion devices.
Unit Maximum Water Working Pressure
Options
Max Pressure PSIG [kPa]
Base Unit
500 [3,445]
Internal Secondary Pump (ISP)
145 [999]
Internal Motorized Water Valve (MWV)
300 [2,068]
Internal Auto Flow Valve
500 [3,445]
Use the lowest maximum pressure rating when multiple options are combined.
Optional hoses have pressure rating of 400 PSIG (2758 (kPa)
Optional Factory Installed Auto Flow Regulator GPM [LPS]
Model
2.25 GPM/Ton
3 GPM/Ton
9
2.0 [.126]
2.5 [.158]
12
2.5 [.158]
3.0 [.189]
15
3.0 [.189]
3.5 [.221]
18
3.5 [.221]
4.0 [.252]
6
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Installation
The installation of Console Water-Source Heat Pumps
and all associated components, parts and accessories
that make up the installation shall be in accordance with
the regulations of ALL Authorities having jurisdiction
and MUST conform to all applicable Codes. It is the
responsibility of the Installing Contractor to determine
and comply with ALL applicable Codes and Regulations.
Note: An Installation Checklist is provided in this
manual. Complete this checklist after all installation
procedures are completed. A periodic maintenance
checklist provided in the Maintenance section outlines
recommended maintenance schedules. A Start-Up
Inspection Log is also included at the end of this
manual to encourage thorough unit checkout at initial
start-up. These checklists are not a substitute for the
detailed information found in the Installation section
of this manual.
1. Console units are typically installed along an outside
wall of the room. Provide adequate space in front
of the unit for service and maintenance. Locate
the Console Unit so that it provides adequate air
circulation throughout the room.
2. Unpack the Console Unit from the shipping carton.
Remove the front cabinet by lifting up and away from
the backplate. Protect the cabinet from damage
during installation by returning it to its original
packaging until required.
3. Using a carpenter's square and a level, ensure the
unit is level. Shim the unit if necessary to assure
proper installation.
4. Select the proper fasteners to connect the backplate
securely to the wall.
5. Fasten the backplate onto the wall through the screw
holes located in the back flange. Secure the subbase
in place.
6. Remove subbase shipping support bracket and
discard.
7. Make all necessary electrical connections as
described in the Electrical Wiring section of this
manual. Consult the wiring diagram to ensure proper
hook-up.
8. Connect the final piping as described in the Supply
and Return Piping and Condensate Piping section
of the manual. Install shut-off valves, piping and/or
hoses and other accessories as specified.
9. Before making the final water connections, flush the
system as described in the Start Up section of this
manual. After flushing the system, connect piping and
hoses to the proper supply, return and condensate
connections of the unit.
Note: When necessary, use adapters to connect hoses.
10. Install any other system components as required
following manufacturer's instructions.
11. After Start-up, reinstall the front cabinet by
carefully lowering the front cabinet over the chassis
onto the backplate.
Supply and Return Hoses - Optional pressure-rated
hose assemblies 400 psi [2758 kPa] are available for use
with Console Units. Use the following guidelines when
installing supply and return hose assemblies.
1. Install supply and return hoses fitted with swivel-joint
fittings at one end to prevent the hose from twisting.
2. Use adapters to secure the hose assembly to the unit
and the riser.
3. Do not allow the hose to twist during installation.
Twisting may damage the hose wall or the interior
rubber compound.
4. Use pipe joint compound sparingly on the pipe
threads of the fitting adapters.
5. Prevent sealant from reaching the flared surfaces of
the joint.
6. Do not use pipe joint compound when teflon thread
tape is pre-applied to hose assemblies or when
flared-end connections are used.
7. Maximum torque which may be applied to brass
fittings is 30 ft-lbs [41 N-m]. When a torque wrench is
not used, tighten brass fittings finger-tight plus one
quarter turn.
8. Tighten steel fittings as necessary.
9. Shut-off/balancing valves, flow indicators, and drain
tees in the supply runout and return at each floor to
aid in loop balancing and servicing.
CAUTION!
CAUTION! Poor or inadequate installation may result in
noisy unit operation or unattractive installation.
7
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Installation
CAUTION!
CAUTION! Loop Fluids should be of good quality with no
more than 0.50 ppm of chlorides w/copper heat exchangers
(125 ppm w/ Cupro-nickel) to prevent corrosion and should
also be filtered to a maximum 800 micron [0.8mm particle
size to prevent erosion of the heat exchangers.
Condensate Piping - Unit is supplied with condensate
drain hose, 5/8 inch [16mm] I.D. flexible plastic
nonpressure-rated, protruding from piping side of unit.
Connect this hose to building drain. Avoid making kinks
in hose to ensure an unobstructed flow of condensate
from the unit to the drain. DO NOT twist, pull hose out,
or push excess hose into unit. If hose will not connect
to your building drain several options include, relocate
end of building drain, add to or cut hose, use hard
plastic or copper elbow fittings for tight radii (put inside
hose). Keep hose positioned within or over subbase
area so hose does not interfere with front cabinet.
Cabinet should not push or reroute hose. Clamp all joints
watertight. Check for leaks.
If the building drain connection is parallel with floor,
the height can be up to 1-1/2 inches [38mm] above the
subbase for proper pitch and correct drainage. Up to
5 inches [127mm] above the subbase is allowable, but
drainage will be slower. When the drain connection
is 2-1/2 to 5 inches [64 to 127mm] above, the hose
inside the unit will act as a trap. Heights of more than 5
inches [127mm] above the subbase are NOT allowable
(condensate overflow may occur). If the unit has a
disconnect option, drain locations are limited. See unit
configuration pages for details.
Field installation of a trap or vent is not required unless
specified by local codes. Console units are designed
in a blow-through configuration. The condensate drain
pan is located on the outlet side of the blower so that
the pressure in the drain pan is higher than atmospheric
pressures.
When drain connection is completed check for proper
drainage and leaks. Correct if necessary.
If trap is used, check and clean often. See Preventive
Maintenance Instructions.
Internally the drain hose is clamped to drain pan and
pitched correctly. Horizontal runs of condensate hose
should be pitched downward 1/4 inch minimum for every
foot [10mm per 46cm] of hose. Avoid low points because
dirt collects in these areas and may cause blockage. If
blocked the condensate level in drain pan increases.
When the level gets too high, the Console unit has
sensor switch that will shut unit off. Overflow may still
occur.
8
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Piping Connections - ERC Size 09-15
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resistant fittings and hoses, and may require water treatment.
CAUTION!
CAUTION! Piping must comply with all applicable codes.
9
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Piping Connections - ERC Size 18
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10
CAUTION! Piping must comply with all applicable codes.
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Piping Connections
Installation of Supply and Return Piping - Follow these
piping guidelines.
1. Install a drain valve at the base of each supply and
return riser to facilitate system flushing.
2. Install shut-off / balancing valves and unions at each
unit to permit unit removal for servicing.
3. Place strainers at the inlet of each system
circulating pump.
4. Select the proper hose length to allow slack between
connection points. Hoses may vary in length by +2%
to -4% under pressure.
5. Refer to Table 1. Do not exceed the minimum bend
radius for the hose selected. Exceeding the minimum
bend radius may cause the hose to collapse, which
reduces water flow rate. Install an angle adapter to
avoid sharp bends in the hose when the radius falls
below the required minimum.
Insulation is not required on loop water piping except
where the piping runs through unheated areas, outside
the building or when the loop water temperature is
below the minimum expected dew point of the pipe
ambient conditions. Insulation is required if loop water
temperature drops below the dew point (insulation is
required for ground loop applications in most climates).
Pipe joint compound is not necessary when Teflon®
thread tape is pre-applied to hose assemblies or when
flared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on
the external pipe threads of the fitting adapters. Prevent
sealant from reaching the flared surfaces of the joint.
Note: When antifreeze is used in the loop, insure that it is
compatible with the Teflon tape or pipe joint compound
that is applied.
WARNING!
WARNING! Polyolester Oil, commonly known as POE oil, is
a synthetic oil used in many refrigeration systems including
those with HFC-410A refrigerant. POE oil, if it ever comes
in contact with PVC or CPVC piping, may cause failure of
the PVC/CPVC. PVC/CPVC piping should never be used
as supply or return water piping with water source heat
pump products containing HFC-410A as system failures and
property damage may result.
CAUTION!
CAUTION! Do not bend or kink supply lines or hoses.
Table 1: Metal Hose Minimum Bend Radii
Hose Diameter
Minimum Bend Radii
1/2" [12.7mm]
2-1/2" [6.4cm]
3/4" [19.1mm]
4" [10.2cm]
1" [25.4mm]
5-1/2" [14cm]
NOTICE! Do not allow hoses to rest against structural
building components. Compressor vibration may
be transmitted through the hoses to the structure,
causing unnecessary noise complaints.
Figure 2: Supply/Return Hose Kit
Rib Crimped
Swivel
Brass
Fitting
Brass
Fitting
Length
(0.6m Length Standard)
MPT
MPT
Maximum allowable torque for brass fittings is 30 ft-lbs
[41 N-m]. If a torque wrench is not available, tighten
finger-tight plus one quarter turn. Tighten steel fittings
as necessary.
Optional pressure-rated hose assemblies are available.
Similar hoses can be obtained from alternate suppliers.
Supply and return hoses are fitted with swivel-joint fittings
at one end to prevent kinking during installation.
Refer to Figure 2 for an illustration of a typical supply/
return hose kit. Adapters secure hose assemblies to
the unit and risers. Install hose assemblies properly and
check regularly to avoid system failure and reduced
service life.
11
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Water-Loop Heat Pump Applications
Commercial Water Loop Applications - Commercial
systems typically include a number of units connected to a
common piping system. Any unit plumbing maintenance
work can introduce air into the piping system; therefore air
elimination equipment is a major portion of the mechanical
room plumbing. In piping systems expected to utilize water
temperatures below 50°F [10°C], 1/2” (13mm) closed cell
insulation is required on all piping surfaces to eliminate
condensation (extended range units required). Metal to
plastic threaded joints should never be used due to their
tendency to leak over time.
Teflon tape thread sealant is recommended to minimize
internal fouling of the heat exchanger. Do not over tighten
connections and route piping so as not to interfere with
service or maintenance access. Hose kits are available in
different configurations for connection between the unit
and the piping system. Depending upon selection, hose
kits may include shut off valves, P/T plugs for performance
measurement, high pressure stainless steel braided hose,
“Y” type strainer with blow down valve, and/or “J” type
swivel connection. Balancing valves and an external low
pressure drop solenoid valve for use in variable speed
pumping systems may also be included in the hose kit.
The piping system should be flushed to remove dirt,
piping chips, and other foreign material prior to operation
(see “Piping System Cleaning and Flushing Procedures”
in this manual). The flow rate is usually set between 2.25
and 3.5 gpm per ton [2.9 and 4.5 l/m per kW] of cooling
capacity. Enertech recommends 3 gpm per ton [3.9 l/m
per kW] for most applications of water loop heat pumps.
To insure proper maintenance and servicing, P/T ports are
imperative for temperature and flow verification, as well as
performance checks.
Water loop heat pump (cooling tower/boiler) systems
typically utilize a common loop, maintained between 60
- 90°F [16 - 32°C]. The use of a closed circuit evaporative
cooling tower with a secondary heat exchanger between
the tower and the water loop is recommended. If an
open type cooling tower is used continuously, chemical
treatment and filtering will be necessary.
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze
10.0°F [-12.2°C]) setpoint and avoid nuisance faults (see
“Low Water Temperature Cutout Selection” in this
manual). Note: Low water temperature operation
requires extended range equipment.
Table 2: Antifreeze Percentages by Volume
Type
Minimum Temperature for Freeze Protection
10ºF [-12.2ºC]
15ºF [-9.4ºC]
20ºF [6.7ºC]
25ºF [-3.9ºC]
Methanol - 100% USP food grade
25%
21%
16%
10%
Propylene Glycol
38%
30%
22%
15%
12
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Ground-Loop Heat Pump Applications
CAUTION!
CAUTION! The following instructions represent industry
accepted installation practices for closed loop earth coupled
heat pump systems. Instructions are provided to assist the
contractor in installing trouble free ground loops. These
instructions are recommendations only. State/provincial
and local codes MUST be followed and installation MUST
conform to ALL applicable codes. It is the responsibility of
the installing contractor to determine and comply with ALL
applicable codes and regulations.
CAUTION!
CAUTION! Ground loop applications require extended range
equipment and optional refrigerant/water circuit insulation.
Pre-Installation - Prior to installation, locate and mark all
existing underground utilities, piping, etc. Install loops
for new construction before sidewalks, patios, driveways,
and other construction has begun. During construction,
accurately mark all ground loop piping on the plot plan
as an aid in avoiding potential future damage to the
installation.
Piping Installation - All earth loop piping materials
should be limited to polyethylene fusion only for inground sections of the loop. Galvanized or steel fittings
should not be used at any time due to their tendency to
corrode. All plastic to metal threaded fittings should be
avoided due to their potential to leak in earth coupled
applications. A flanged fitting should be substituted. P/T
plugs should be used so that flow can be measured using
the pressure drop of the unit heat exchanger.
Antifreeze - If any liquid fluid or piping is exposed to
unconditioned ambient below 42°F (5.5 C), antifreeze
must be added. If the liquid fluid entering the heat pump
is 50°F (10°C) or below, calculate the leaving heat pump
temperature (shown in submittal on performance data
selection notes section). Using the lowest temperature
leaving the heat pump, must protect system 15°F (8°C)
lower. IE: if temperature leaving the heat pump is 35°F
subtract 15°F = 20°F protection required, if Methanol
is used the system would require 16% mix by volume.
Antifreeze is available in alcohol and glycols, contact
local sales office for the best type for your system and
area. Following must be considered safety, thermal
performance, corrosiveness, local codes, stability,
convenience, and cost.
All alcohols should be premixed and pumped from
a reservoir outside of the building when possible or
introduced under the water level to prevent fumes.
Calculate the total volume of fluid in the piping system.
Then use the percentage by volume shown in table
2 for the amount of antifreeze needed. Antifreeze
concentration should be checked from a well mixed
sample using a hydrometer to measure specific gravity.
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze
10.0°F [-12.2°C]) setpoint and avoid nuisance faults (see
“Low Water Temperature Cutout Selection” in this
manual). Note: Low water temperature operation
requires extended range equipment.
Earth loop temperatures can range between 25 and
110°F [-4 to 43°C]. Flow rates between 2.25 and 3 gpm
per ton [2.41 to 3.23 l/m per kW] of cooling capacity is
recommended in these applications.
Test individual horizontal loop circuits before backfilling.
Test vertical U-bends and pond loop assemblies prior to
installation. Pressures of at least 100 psi [689 kPa] should
be used when testing. Do not exceed the pipe pressure
rating. Test entire system when all loops are assembled.
Flushing the Earth Loop - Upon completion of system
installation and testing, flush the system to remove all
foreign objects and purge to remove all air.
13
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Ground-Water Heat Pump Applications
Open Loop - Ground Water Systems - Shut off valves
should be included for ease of servicing. Boiler drains or
other valves should be “tee’d” into the lines to allow acid
flushing of the heat exchanger. Shut off valves should be
positioned to allow flow through the coax via the boiler
drains without allowing flow into the piping system.
P/T plugs should be used so that pressure drop and
temperature can be measured. Supply and return water
piping materials should be limited to copper, PE, or similar
material. PVC or CPVC should never be used as they are
incompatible with the POE oils used in HFC-410A products
and piping system failure and property damage may result.
WARNING!
WARNING! Polyolester Oil, commonly known as POE oil, is
a synthetic oil used in many refrigeration systems including
those with HFC-410A refrigerant. POE oil, if it ever comes
in contact with PVC or CPVC piping, may cause failure of
the PVC/CPVC. PVC/CPVC piping should never be used
as supply or return water piping with water source heat
pump products containing HFC-410A as system failures and
property damage may result.
Water quantity should be plentiful and of good quality.
Consult table 3 for water quality guidelines. The unit can
be ordered with either a copper or cupro-nickel water heat
exchanger. Consult Table 3 for recommendations. Copper
is recommended for closed loop systems and open
loop ground water systems that are not high in mineral
content or corrosiveness. In conditions anticipating heavy
scale formation or in brackish water, a cupro-nickel heat
exchanger is recommended. In ground water situations
where scaling could be heavy or where biological growth
such as iron bacteria will be present, an open loop system
is not recommended. Heat exchanger coils may over
time lose heat exchange capabilities due to build up of
mineral deposits. Heat exchangers must only be serviced
by a qualified technician, as acid and special pumping
equipment is required. Desuperheater coils can likewise
become scaled and possibly plugged. In areas with
extremely hard water, the owner should be informed that
the heat exchanger may require occasional acid flushing.
In some cases, the desuperheater option should not be
recommended due to hard water conditions and additional
maintenance required.
Water Quality Standards - Table 3 should be consulted
for water quality requirements. Scaling potential should
be assessed using the pH/Calcium hardness method.
If the pH <7.5 and the calcium hardness is less than
100 ppm, scaling potential is low. If this method yields
numbers out of range of those listed, the Ryznar Stability
and Langelier Saturation indecies should be calculated.
14
Use the appropriate scaling surface temperature for the
application, 150°F [66°C] for direct use (well water/open
loop) and DHW (desuperheater); 90°F [32°F] for indirect
use. A monitoring plan should be implemented in these
probable scaling situations. Other water quality issues
such as iron fouling, corrosion prevention and erosion and
clogging should be referenced in Table 3.
Expansion Tank and Pump - Use a closed, bladder-type
expansion tank to minimize mineral formation due to air
exposure. The expansion tank should be sized to provide at
least one minute continuous run time of the pump using its
drawdown capacity rating to prevent pump short cycling.
Discharge water from the unit is not contaminated in any
manner and can be disposed of in various ways, depending
on local building codes (e.g. recharge well, storm sewer,
drain field, adjacent stream or pond, etc.). Most local codes
forbid the use of sanitary sewer for disposal. Consult your
local building and zoning department to assure compliance
in your area.
Water Control Valve - Always maintain water pressure in
the heat exchanger by placing the water control valve(s)
on the discharge line to prevent mineral precipitation
during the off-cycle. Pilot operated slow closing valves are
recommended to reduce water hammer. If water hammer
persists, a mini-expansion tank can be mounted on the
piping to help absorb the excess hammer shock. Insure
that the total ‘VA’ draw of the valve can be supplied by
the unit transformer. For instance, a slow closing valve
can draw up to 35VA. This can overload smaller 40 or
50 VA transformers depending on the other controls in
the circuit. A typical pilot operated solenoid valve draws
approximately 15VA..
Flow Regulation - Flow regulation can be accomplished
by two methods. One method of flow regulation involves
simply adjusting the ball valve or water control valve on
the discharge line. Measure the pressure drop through the
unit heat exchanger, and determine flow rate. Since the
pressure is constantly varying, two pressure gauges may be
needed. Adjust the valve until the desired flow of 1.5 to 2
gpm per ton [2.0 to 2.6 l/m per kW] is achieved. A second
method of flow control requires a flow control device
mounted on the outlet of the water control valve. The
device is typically a brass fitting with an orifice of rubber
or plastic material that is designed to allow a specified
flow rate. On occasion, flow control devices may produce
velocity noise that can be reduced by applying some back
pressure from the ball valve located on the discharge line.
Slightly closing the valve will spread the pressure drop over
both devices, lessening the velocity noise. Note: When
EWT is below 50°F [10°C], 2 gpm per ton (2.6 l/m per
kW) is required.
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Ground-Water Heat Pump Applications
Water Coil Low Temperature Limit Setting - For all
open loop systems the 30°F [-1.1°C] LT1 setting (factory
setting-water) should be used to avoid freeze damage to
the unit. See “Low Water Temperature Cutout Selection”
in this manual for details on the low limit setting.
Notice! Ground-water applications for commercial
buildings with more than 2-3 units should include
a plate frame heat-exchanger to isolate the heat
pumps from the ground-water and confine heat
exchanger cleanings to one location and lessen
maintenance. Direct use of ground-water may
increase the frequency of heat pump maintenance
and may shorten life expectancy.
15
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Water Quality Standards
Table 2: Water Quality Standards
Water Quality
Parameter
HX
Material
Closed
Recirculating
Open Loop and Recirculating Well
Scaling Potential - Primary Measurement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below
pH/Calcium Hardness
Method
All
-
pH < 7.5 and Ca Hardness <100ppm
Index Limits for Probable Scaling Situations - (Operation outside these limits is not recommended)
Scaling indexes should be calculated at 66°C for direct use and HWG applications, and at 32°C for indirect HX use.
A monitoring plan should be implemented.
Ryznar
6.0 - 7.5
All
Stability Index
If >7.5 minimize steel pipe use.
-0.5 to +0.5
Langelier
All
If <-0.5 minimize steel pipe use. Based upon 66°C HWG and
Saturation Index
Direct well, 29°C Indirect Well HX
Iron Fouling
Iron Fe 2+ (Ferrous)
(Bacterial Iron potential)
All
Iron Fouling
All
-
<0.2 ppm (Ferrous)
If Fe2+ (ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria.
-
<0.5 ppm of Oxygen
Above this level deposition will occur .
Corrosion Prevention
6 - 8.5
pH
All
Hydrogen Sulfide (H2S)
All
Ammonia ion as hydroxide, chloride,
nitrate and sulfate compounds
All
Monitor/treat as
needed
-
6 - 8.5
Minimize steel pipe below 7 and no open tanks with pH <8
<0.5 ppm
At H2S>0.2 ppm, avoid use of copper and copper nickel piping or HX's.
Rotten egg smell appears at 0.5 ppm level.
Copper alloy (bronze or brass) cast components are OK to <0.5 ppm.
-
<0.5 ppm
Maximum Allowable at maximum water temperature.
Maximum
Chloride Levels
Copper
Cupronickel
304 SS
316 SS
Titanium
-
10$C
<20ppm
<150 ppm
<400 ppm
<1000 ppm
>1000 ppm
24$C
NR
NR
<250 ppm
<550 ppm
>550 ppm
38 C
NR
NR
<150 ppm
< 375 ppm
>375 ppm
Erosion and Clogging
Particulate Size and
Erosion
All
<10 ppm of particles
and a maximum
velocity of 1.8 m/s
Filtered for maximum
841 micron [0.84 mm,
20 mesh] size.
<10 ppm (<1 ppm "sandfree” for reinjection) of particles and a maximum
velocity of 1.8 m/s. Filtered for maximum 841 micron 0.84 mm,
20 mesh] size. Any particulate that is not removed can potentially
clog components.
This Water Quality Table provides water quality requirements for Enertech coaxial heat exchangers. The water should be evaluated by an independent testing facility
comparing to this Table and when properties are outside of these requirements, an external secondary heat exchanger must be used to isolate the heat pump heat
exchanger from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger and any other components damaged by a leak.
Notes:
• Closed Recirculating system is identified by a closed pressurized piping system.
• Recirculating open wells should observe the open recirculating design considerations.
• NR - Application not recommended.
• "-" No design Maximum.
16
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Electrical - Line Voltage
WARNING!
WARNING! To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and secure
it in an open position during installation.
CAUTION!
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
Electrical - Line Voltage - All field installed wiring,
including electrical ground, must comply with the National
Electrical Code as well as all applicable local codes. Refer
to the unit electrical data for fuse sizes. Consult wiring
diagram for field connections that must be made by
the installing (or electrical) contractor. All final electrical
connections must be made with a length of flexible conduit
to minimize vibration and sound transmission to the
building.
General Line Voltage Wiring - Be sure the available
power is the same voltage and phase shown on the unit
serial plate. Line and low voltage wiring must be done in
accordance with local codes or the National Electric Code,
whichever is applicable.
Power Connection - Line voltage connection is made by
connecting the incoming line voltage wires to the “L” side
of the contactor. Consult Tables 4 through 5 for correct
fuse size.
Transformer - All commercial dual voltage units are
factory wired for 208/60/1. If supply voltage is 230/60/1,
installer must rewire transformer. See wire diagram for
connections.
17
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Table 4: ERC Electrical Data
Model
ERC09
ERC12
Voltage
Code
Voltage
A
115/60/1
Min/Max
Voltage
104-126
RLA
LRA
Fan
Motor
FLA
8.0
50.0
0.6
Compressor
G
208-230/60/1
197-254
3.7
22.0
0.5
E
265/60/1
239-292
3.5
22.0
0.4
A
115/60/1
104-126
9.5
50.0
1.0
G
208-230/60/1
197-254
4.7
25.0
0.6
E
265/60/1
239-292
4.2
22.0
0.4
G
208-230/60/1
197-254
5.6
29.0
0.7
E
265/60/1
239-292
5.0
28.0
0.6
G
208-230/60/1
197-254
6.6
33.0
0.7
E
265/60/1
239-292
5.6
28.0
0.6
ERC15
ERC18
18
Pump
Option
FLA
Total
Unit
FLA
Min
Circuit
Amps
Max
Fuse
Amps
N/A
8.60
10.60
15
15
1.0
9.60
11.60
N/A
4.20
5.13
15
0.8
5.00
5.93
15
N/A
3.90
4.78
15
0.7
4.60
5.48
15
N/A
10.50
12.88
20
1.4
11.90
14.28
20
N/A
5.30
6.48
15
1.07
6.37
7.55
15
N/A
4.60
5.65
15
15
1.3
5.90
6.95
N/A
6.30
7.70
15
1.07
7.37
8.77
15
N/A
5.60
6.85
15
1.3
6.90
8.15
15
N/A
7.30
8.95
15
1.07
8.37
10.02
15
N/A
6.20
7.60
15
1.3
7.50
8.90
15
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Figure 3: Typical Field Installed Wiring
A
Field Supplied
Disconnect Switch
WARNING!
WARNING! To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and secure
it in an open position during installation.
CAUTION!
Heat Pump
B
Room Thermostat
A= Two power wires on single-phase units: three power
wires on three-phase units. B= 1 heat /1 cool /manual
or Auto Change-over remote 24V thermostat. Note: All
customer-supplied wiring to be copper only and must
conform to NEC and local electrical codes. Wiring
shown with dashed lines must be field-supplied and
field-installed. "B" only required with systems employing
remote mounted thermostats.
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze
10.0°F [-12.2°C]) setpoint and avoid nuisance faults (see
“Low Water Temperature Cutout Selection” in this
manual). Note: Low water temperature operation
requires extended range equipment.
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
Figure 4: LT1 Limit Setting
LT1
LT2
JW3-LT1 jumper should
be clipped for low
temperature operation
CXM PCB
19
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Electrical - Low Voltage
Unit-Mounted Control Models include digital display
unit-mounted auto changeover (ACO) control. (see Fig. 5).
Figure
g
5: ACO Thermostat
Thermostat has advanced features to be changed by
qualified installer only (do not use code 99- to restore
factory default settings, reset each code if needed.)
To enter advanced mode push and hold fan button for
10-15 seconds. Use mode and arrow buttons to make
selections.
Code 02 is sensor selection : rS is remote (default) DO
NOT CHANGE.
Code 07 is delay: off - timeguard enabled (default); ontimeguard disabled. DO NOT CHANGE.
Code 11 is deadband between auto heat and cool: 1
through 10 for ºF or ºC ( 5 default).
Code 15 is auto or manual: On is auto (default); of is manual.
To Change Mode - push mode button to toggle through
heat only, cool only, auto, off. Stop where desired.
Code 21 is keypad lock: user has full access (default); 1
only access to setpoints; cd entire keypad is locked.
To Adjust Setpoint - push up arrow for temperature
increase or down arrow for temperature decrease. Stop
where desired.
Code 26 is minimum cooling setpoint: 55ºF to 90ºF (60ºF
default).
[12 ºC to 32 ºC (50 ºC default)]
To Select Fan Operation/Speed - push fan button to
toggle through fan on low, fan on hi, fan auto lo, and fan
auto hi. Stop where desired. ON is continuous and Auto
cycles fan with compressor.
Code 27 is maximum heating setpoint: 50ºF to 90ºF (85ºF
default).
[10 ºC to 32 ºC (29 ºC default)]
To Configure Thermostat - for temperature reading in
Fahrenheit or Celsius and backlight on/off.
Temperature reading - Press and hold mode button for 3-5
seconds.
Thermostat has additional codes - DO NOT CHANGE.
Figure 6: Display
keypad
lock
Mode
Screen will flash U1 with ºF or ºC below. Press and release
mode button ºF or ºC will flash. Use down arrow to change
to ºC. Use up arrow to change to ºF.
ºF
heat
Press fan button to escape.
actual temp
Backlight - Press and hold mode button for 3-5 seconds.
fan
on
Screen will flash U1 press up arrow and screen will change
to U2 flashing. Press and release mode button and on will
flash. To turn off push down arrow, push up arrow to get
back to on.
Press fan button to escape.
20
Fan
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
set at
Setting
Console (ERC) Series
Created: September 1, 2017
Optional Wall-Mounted Thermostat
ERC WSHP units (Model digit 8 is C, D, F, or K) are built
with standard internal thermostat that has automatic
changeover (ACO) configuration. No external, fieldinstalled low-voltage wiring is required.
When desired, the unit can be furnished with a 24-volt
control circuit which is field-wired to a remote thermostat.
Low-voltage wiring between the unit and the wall
thermostat must comply with all applicable electrical codes
(i.e., NEC and local codes), and be completed before the
unit is installed.
Table 6: Recommended Thermostat Wire Sizes
Wire Size
Figure 7: Typical Remote Thermostat Wiring
Connection to CXM Control
Thermostat
CXM
Compressor
Y
Y
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
O
O
G
G
R
R
C
C
L
AL1
Note: If ATA11U03 is used must jumper G and G2
Maximum Wire Length*
18-Gauge
75 feet [22m]
16-Gauge
125 feet [38m]
14-Gauge
200 feet [60 m]
Figure 7a: Wiring for multiple units to be controlled
from 1 thermostat
*Length = Physical distance from thermostat to unit.
Thermostat Installation - The thermostat should be
located on an interior wall in a larger room, away from
supply air drafts. DO NOT locate the thermostat in areas
subject to sunlight, drafts or on external walls. The wire
access hole behind the thermostat may in certain cases
need to be sealed to prevent erroneous temperature
measurement. Position the thermostat back plate against
the wall so that it appears level and so the thermostat wires
protrude through the middle of the back plate. Mark the
position of the back plate mounting holes and drill holes
with a 3/16” (5mm) bit. Install supplied anchors and secure
plate to the wall. Thermostat wire must be 18 AWG wire.
Wire the appropriate thermostat as shown in Figure 7 to
the low voltage terminal strip on the CXM or DXM control
board. Practically any heat pump thermostat will work with
ERC units, provided it has the correct number of heating
and cooling stages.
Thermostat
CS
DXM
Unit
1
CS
DXM
Unit
2-6
Connect thermostat to Unit 1 then
jumper Com 1 (S to S and C to C)
up to 6 units with twisted pair.
Zone integrity must be maintained to efficiently control
units or groups of units. Unless zones of control are
considered and accounted for, adjacent units may operate
in heating and cooling modes simultaneously, to prevent
units with DXM can be wired per figure 7A.
21
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
ERC Series Wiring Diagram Matrix
Please contact our Technical Service Department at 618-664-5860 for wiring diagram information.
Model
ERC09ERC18
Refrigerant
Wiring Diagram
Part Number
R410A
96B0292N01
R410A
96B0292N02
R410A
96B0292N03
R410A
96B0292N04
R410A
96B0293N01
R410A
96B0293N02
R410A
96B0293N03
R410A
96B0293N04
Electrical
V-Hz-Ph
Control
115-60-1,
208/230-60-1,
265-60-1
Agency
ACO/MCO
ETL
REM
ETL
CXM
115-60-1,
208/230-60-1,
265-60-1
OFF
ETL
ETL
LON
ETL
MPC
ETL
DXM
ON
OFF
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
7
7
8
8
S1
S1
ERC DIGIT 8 = L,N + CXM w/LON or MPC
OFF
ON
S2
ERC DIGIT 8 = M,P + DXM w/LON or MPC
OFF
ON
OFF
ON
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
7
7
8
8
S1
S1
22
ON
1
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
S2
ETL
REM
ERC DIGIT 8 = D,S + DXM Standard
OFF
ON
ETL
MPC
ACO/MCO
DIP Setting for Board
ERC DIGIT 8 = C,R + CXM Standard
LON
Console (ERC) Series
Created: September 1, 2017
CXM Controls
CXM Control - For detailed control information, see
CXM Application, Operation and Maintenance (AOM)
manual (part # 97B0003N12).
Field Selectable Inputs - Test mode: Test mode allows
the service technician to check the operation of the
control in a timely manner. At board, momentarily
shorting the test terminals or externally, momentarily
push test button (See Fig 10), the CXM control enters a
20 minute test mode period in which all time delays are
sped up 15 times. Upon entering test mode, the status
LED will flash a code representing the last fault. For
diagnostic ease at the thermostat, the alarm relay will
also cycle during test mode. The alarm relay will cycle
on and off similar to the status LED to indicate a code
representing the last fault, at the thermostat. Test mode
can be exited by shorting the test terminals or holding
button for 3 seconds.
Retry Mode: If the control is attempting a retry of a fault,
the status LED will slow flash (slow flash = one flash every
2 seconds) to indicate the control is in the process of
retrying.
Field Configuration Options - Note: In the following
field configuration options, jumper wires should be
clipped ONLY when power is removed from the CXM
control.
Water coil low temperature limit setting: Jumper 3 (JW3LT1 Low Temp) provides field selection of temperature
limit setting for LT1 of 30°F or 10°F [-1°F or -12°C]
(refrigerant temperature).
Not Clipped = 30°F [-1°C]. Clipped = 10°F [-12°C].
Air coil low temperature limit setting: Jumper 2 (JW2LT2 Low Temp) provides field selection of temperature
limit setting for LT2 of 30°F or 10°F [-1°F or -12°C]
(refrigerant temperature). Note: This jumper should
only be clipped under extenuating circumstances, as
recommended by the factory.
Not Clipped = 30°F [-1°C]. Clipped = 10°F [-12°C].
Alarm relay setting: Jumper 1 (JW1-AL2 Dry) provides field
selection of the alarm relay terminal AL2 to be jumpered
to 24VAC or to be a dry contact (no connection).
Not Clipped = AL2 connected to R. Clipped = AL2 dry
contact (no connection).
DIP Switches - Note: In the following field configuration
options, DIP switches should only be changed when
power is removed from the CXM control.
DIP switch 1: Unit Performance Sentinel Disable provides field selection to disable the UPS feature.
On = Enabled. Off = Disabled.
DIP switch 2: Stage 2 Selection - provides selection of
whether compressor has an “on” delay. If set to stage
2, the compressor will have a 3 second delay before
energizing. Also, if set for stage 2, the alarm relay will
NOT cycle during test mode.
On = Stage 1. Off = Stage 2
DIP switch 3: Not Used.
DIP switch 4: DDC Output at EH2 - provides selection for
DDC operation. If set to “DDC Output at EH2,” the EH2
terminal will continuously output the last fault code of
the controller. If set to “EH2 normal,” EH2 will operate as
standard electric heat output.
On = EH2 Normal. Off = DDC Output at EH2.
Note: Some CXM controls only have a 2 position DIP
switch package. If this is the case, this option can be
selected by clipping the jumper which is in position 4
of SW1.
Jumper not clipped = EH2 Normal. Jumper clipped =
DDC Output at EH2.
DIP switch 5: Factory Setting - Normal position is “On.”
Do not change selection unless instructed to do so by
the factory.
Table 7a: LED And Alarm Relay Operations
Description of Operation
LED
Normal Mode
ON
Alarm
Open
Over/Under Voltage Shutdown
Slow Flash
Test Mode - No Fault in Memory
Test Mode - HP Fault in Memory
Test Mode - LP Fault in Memory
Test Mode - LT1 Fault in Memory
Test Mode - LT2 Fault in Memory
Test Mode - CO Fault in Memory
Test Mode - Over/Under
Shutdown in Memory
Test Mode - UPS in Memory
Test Mode - Swapped Thermistor
Flashing Code 1
Flashing Code 2
Flashing Code 3
Flashing Code 4
Flashing Code 5
Flashing Code 6
Cycle (Closed 5 seconds,
Open 25 seconds)
Open
Open
Closed
Open (Closed after 15
Minutes)
Cycling Code 1
Cycling Code 2
Cycling Code 3
Cycling Code 4
Cycling Code 5
Cycling Code 6
Flashing Code 7
Cycling Code 7
Flashing Code 8
Flashing Code 9
Cycling Code 8
Cycling Code 9
Normal Mode w/UPS Warning
ON
CXM is non-functional
Fault Retry
Lockout
OFF
Slow Flash
Fast Flash
-Slow Flash = 1 flash every 2 seconds
-Fast Flash = 2 flashes every 1 second
-Flash code 2 = 2 quick flashes, 10 second pause, 2 quick
flashes, 10 second pause, etc.
-On pulse 1/3 second; off pulse 1/3 second
23
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
DXM Controls
DXM Control - For detailed control information, see
DXM AOM (part #97B0003N13), Lon controller AOM (part
#97B0013N01) or MPC AOM (part # 97B0031N01).
Table 7b: DXM LED And Alarm Relay Operations
Water coil low temperature limit setting: Jumper
3 (JW3-LT1 Low Temp) provides field selection of
temperature limit setting for LT1 of 30°F or 10°F [-1°F or
-12°C] (refrigerant temperature).
Not Clipped = 30°F [-1°C]. Clipped = 10°F
Status LED
Test LED
Fault LED
Description of
[-12°C].
Alarm Relay
(red)
Operation
(green)
(yellow)
Air coil low temperature limit setting: Jumper
Normal mode
On
Off
Open
2 (JW2-LT2 Low Temp) provides field selection
Cycle (closed 5 sec,
Normal mode with UPS
On
Flashing Code 8
open 25 sec)
of temperature limit setting for LT2 of 30°F or
DXM is non-functional
Off
Off
Off
Open
10°F [-1°F or -12°C] (refrigerant temperature).
Fault Retry
Slow Flash
Flashing fault code
Open
Note: This jumper should only be clipped
Lockout
Fast Flash
Flashing fault code
Closed
Test Mode
On
under extenuating circumstances, as
Night Setback
Flashing Code 2
recommended by Enertech technical
ESD
Flashing Code 3
services.
Invalid T-stat Inputs
Flashing Code 4
HP Fault
Slow Flash
Flashing Code 2
Open
Not Clipped = 30°F [-1°C]. Clipped = 10°F
LP Fault
Slow Flash
Flashing Code 3
Open
[-12°C].
LT1 Fault
Slow Flash
Flashing Code 4
Open
Alarm relay setting: Jumper 4 (JW4-AL2 Dry)
LT2 Fault
Slow Flash
Flashing Code 5
Open
CO Fault
Slow Flash
Flashing Code 6
Open
provides field selection of the alarm relay
Open (closed after 15
Over/Under Voltages
Slow Flash
Flashing Code 7
terminal AL2 to be jumpered to 24VAC or to
minutes)
be a dry contact (no connection).
-Slow Flash = 1 flash every 2 seconds
Not Clipped = AL2 connected to R.
-Fast Flash = 2 flashes every 1 second
Clipped = AL2 dry contact (no connection).
-Flash code 2 = 2 quick flashes, 10 second pause, 2 quick
Low pressure normally open: Jumper 1 (JW1-LP norm
flashes, 10 second pause, etc.
open) provides field selection for low pressure input to
-On pulse 1/3 second; off pulse 1/3 second
be normally closed or normally open.
Not Clipped = LP normally closed. Clipped = LP normally
Field Selectable Inputs - Test mode: Test mode allows
open.
the service technician to check the operation of the
control in a timely manner. By momentarily shorting the
DIP Switches - Note: In the following field
test terminals, the DXM control enters a 20 minute test
configuration options, DIP switches should only be
mode period in which all time delays are sped up 15
changed when power is removed from the DXM
times. Upon entering test mode, the status LED will flash
control.
a code representing the last fault. For diagnostic ease at
the thermostat, the alarm relay will also cycle during test
DIP Package #1 (S1) - DIP Package #1 has 8 switches
mode. The alarm relay will cycle on and off similar to the
and provides the following setup selections:
status LED to indicate a code representing the last fault,
1.1 - Unit Performance Sentinel (UPS) disable: DIP Switch
at the thermostat. Test mode can be exited by shorting
1.1 provides field selection to disable the UPS feature.
the test terminals for 3 seconds.
On = Enabled. Off = Disabled.
1.2 - Compressor relay staging operation: DIP 1.2
Retry mode: If the control is attempting a retry of a fault, provides selection of compressor relay staging operation.
the status LED will slow flash (slow flash = one flash every
The compressor relay can be selected to turn on with
2 seconds) to indicate the control is in the process of
a stage 1 or stage 2 call from the thermostat. This
retrying.
is used with dual stage units (2 compressors where
2 DXM controls are being used) or with master/
Field Configuration Options - Note: In the following
slave applications. In master/slave applications,
field configuration options, jumper wires should be
each compressor and fan will stage according to
clipped ONLY when power is removed from the DXM
its appropriate DIP 1.2 setting. If set to stage 2, the
control.
compressor will have a 3 second on-delay before
energizing during a Stage 2 demand. Also, if set for stage
2, the alarm relay will NOT cycle during test mode.
24
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
On = Stage 1. Off = Stage 2.
1.3 - Thermostat type (heat pump or heat/cool): DIP 1.3
provides selection of thermostat type. Heat pump or
heat/cool thermostats can be selected. When in heat/
cool mode, Y1 is the input call for cooling stage 1; Y2 is
the input call for cooling stage 2; W1 is the input call for
heating stage 1; and O/W2 is the input call for heating
stage 2. In heat pump mode, Y1 is the input call for
compressor stage 1; Y2 is the input call for compressor
stage 2; W1 is the input call for heating stage 3 or
emergency heat; and O/W2 is the input call for reversing
valve (heating or cooling, depending upon DIP 1.4).
On = Heat Pump. Off = Heat/Cool.
1.4 - Thermostat type (O/B): DIP 1.4 provides selection of
thermostat type for reversing valve activation. Heat pump
thermostats with “O” output (reversing valve energized
for cooling) or “B” output (reversing valve energized for
heating) can be selected with DIP 1.4.
On = HP stat with “O” output for cooling. Off = HP stat
with “B” output for heating.
1.5 - Dehumidification mode: DIP 1.5 provides
selection of normal or dehumidification fan mode. In
dehumidification mode, the fan speed relay will remain
off during cooling stage 2. In normal mode, the fan
speed relay will turn on during cooling stage 2.
On = Normal fan mode. Off = Dehumidification mode.
1.6 - DDC output at EH2: DIP 1.6 provides selection for
DDC operation. If set to “DDC Output at EH2,” the EH2
terminal will continuously output the last fault code of
the controller. If set to “EH2 normal,” EH2 will operate as
standard electric heat output.
On = EH2 Normal. Off = DDC Output at EH2.
1.7 - Boilerless operation: DIP 1.7 provides selection of
boilerless operation. In boilerless mode, the compressor
is only used for heating when LT1 is above the
temperature specified by the setting of DIP 1.8. Below
DIP 1.8 setting, the compressor is not used and the
control goes into emergency heat mode, staging on EH1
and EH2 to provide heating.
On = normal. Off = Boilerless operation.
1.8 - Boilerless changeover temperature: DIP 1.8
provides selection of boilerless changeover temperature
setpoint. Note that the LT1 thermistor is sensing
refrigerant temperature between the coaxial heat
exchanger and the expansion device (TXV). Therefore,
the 50°F [10°C] setting is not 50°F [10°C] water, but
approximately 60°F [16°C] EWT.
On = 50°F [10°C]. Off = 40°F [16°C].
DIP Package #2 (S2) - DIP Package #2 has 8 switches and
provides the following setup selections:
2.1 - Accessory1 relay personality: DIP 2.1 provides
selection of ACC1 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.2 - Accessory1 relay personality: DIP 2.2 provides
selection of ACC 1 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.3 - Accessory1 relay personality: DIP 2.3 provides
selection of ACC 1 relay options. See table 5c for
description of functionality.
2.4 - Accessory2 relay personality: DIP 2.4 provides
selection of ACC 2 relay personality (relay operation/
characteristics). See table5c for description of functionality.
2.5 - Accessory2 relay personality: DIP 2.5 provides
selection of ACC 2 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.6 - Accessory2 relay personality: DIP 2.6 provides
selection of ACC 2 relay options. See table 5c for
description of functionality.
2.7 - Auto dehumidification fan mode or high fan mode:
DIP 2.7 provides selection of auto dehumidification fan
mode or high fan mode. In auto dehumidification mode,
the fan speed relay will remain off during cooling stage 2
IF the H input is active. In high fan mode, the fan enable
and fan speed relays will turn on when the H input is
active.
On = Auto dehumidification mode. Off = High fan mode.
2.8 - Special factory selection: DIP 2.8 provides special
factory selection. Normal position is “On”. Do not change
selection unless instructed to do so by the factory.
Table 7c: Accessory DIP Switch Settings
DIP 2.1
DIP 2.2
DIP 2.3
ACC1 Relay Option
On
On
On
Cycle with fan
Off
On
On
Digital NSB
On
Off
On
Water Valve - slow opening
On
On
Off
OAD
Off
Off
Off
Reheat Option - Humidistat
Off
On
Off
Reheat Option - Dehumidistat
DIP 2.4
DIP 2.5
DIP 2.6
ACC2 Relay Option
On
On
On
Cycle with compressor
Off
On
On
Digital NSB
On
Off
On
Water Valve - slow opening
On
On
Off
OAD
All other DIP combinations are invalid
25
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Safety Features - CXM/DXM Controls
Safety Features – CXM/DXM Control - The safety
features below are provided to protect the compressor,
heat exchangers, wiring and other components from
damage caused by operation outside of design
conditions.
Anti-short cycle protection: The control features a 5
minute anti-short cycle protection for the compressor.
Note: The 5 minute anti-short cycle also occurs at
power up.
Random start: The control features a random start upon
power up of 5-80 seconds.
Fault Retry: In Fault Retry mode, the Status LED begins
slowly flashing to signal that the control is trying to
recover from a fault input. The control will stage off the
outputs and then “try again” to satisfy the thermostat
input call. Once the thermostat input call is satisfied,
the control will continue on as if no fault occurred. If 3
consecutive faults occur without satisfying the thermostat
input call, the control will go into “lockout” mode. The
last fault causing the lockout will be stored in memory
and can be viewed at the “fault” LED (DXM board) or by
going into test mode (CXM board). Note: LT1/LT2 faults
are factory set at only one try.
Lockout: In lockout mode, the status LED will begin fast
flashing. The compressor relay is turned off immediately.
Lockout mode can be “soft” reset by turning off the
thermostat (or satisfying the call). A “soft” reset keeps
the fault in memory but resets the control. A “hard”
reset (disconnecting power to the control) resets the
control and erases fault memory.
Lockout with emergency heat: While in lockout mode,
if W becomes active (CXM), emergency heat mode will
occur. If DXM is configured for heat pump thermostat
type (DIP 1.3), emergency heat will become active if O/
W2 is energized.
High pressure switch: When the high pressure switch
opens due to high refrigerant pressures, the compressor
relay is de-energized immediately since the high pressure
switch is in series with the compressor contactor coil. The
high pressure fault recognition is immediate (does not
delay for 30 continuous seconds before de-energizing
the compressor).
High pressure lockout code = 2
Example: 2 quick flashes, 10 sec pause, 2 quick flashes, 10
sec. pause, etc.
Low pressure switch: The low pressure switch must be
open and remain open for 30 continuous seconds during
“on” cycle to be recognized as a low pressure fault. If
the low pressure switch is open for 30 seconds prior to
compressor power up it will be considered a low pressure
(loss of charge) fault. The low pressure switch input is
bypassed for the initial 120 seconds of a compressor
run cycle.
26
Low pressure lockout code = 3
Water coil low temperature (LT1): The LT1 thermistor
temperature must be below the selected low
temperature limit setting for 30 continuous seconds
during a compressor run cycle to be recognized as a LT1
fault. The LT1 input is bypassed for the initial 120 seconds
of a compressor run cycle. LT1 is set at the factory for one
try. Therefore, the control will go into lockout mode once
the LT1 fault has occurred.
LT1 lockout code = 4
Air coil low temperature (LT2): The LT2 thermistor
temperature must be below the selected low
temperature limit setting for 30 continuous seconds
during a compressor run cycle to be recognized as a LT2
fault. The LT2 input is bypassed for the initial 60 seconds
of a compressor run cycle. LT2 is set at the factory for one
try. Therefore, the control will go into lockout mode once
the LT2 fault has occurred.
LT2 lockout code = 5
Condensate overflow: The condensate overflow sensor
must sense overflow level for 30 continuous seconds to
be recognized as a CO fault. Condensate overflow will be
monitored at all times.
CO lockout code = 6
Over/under voltage shutdown: An over/under voltage
condition exists when the control voltage is outside the
range of 19VAC to 30VAC. Over/under voltage shut
down is a self-resetting safety. If the voltage comes back
within range for at least 0.5 seconds, normal operation
is restored. This is not considered a fault or lockout. If
the CXM/DXM is in over/under voltage shutdown for 15
minutes, the alarm relay will close.
Over/under voltage shut down code = 7
Unit Performance Sentinel-UPS (patent pending): The
UPS feature indicates when the heat pump is operating
inefficiently. A UPS condition exists when:
a. In heating mode with compressor energized,
LT2 is greater than 125°F [52°C] for 30
continuous seconds, or:
b. In cooling mode with compressor energized,
LT1 is greater than 125°F [52°C] for 30
continuous seconds, or:
c. In cooling mode with compressor energized,
LT2 is less than 40°F [4.5°C] for 30 continuous
seconds.
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
If a UPS condition occurs, the control will immediately go to UPS warning. The status LED will remain on as
if the control is in normal mode. Outputs of the control,
excluding LED and alarm relay, will NOT be affected by
UPS. The UPS condition cannot occur during a compressor off cycle. During UPS warning, the alarm relay will cycle on and off. The cycle rate will be “on” for 5 seconds,
“off” for 25 seconds, “on” for 5 seconds, “off” for 25
seconds, etc.
UPS warning code = 8
Swapped LT1/LT2 thermistors: During test mode, the
control monitors to see if the LT1 and LT2 thermistors are
in the appropriate places. If the control is in test mode,
the control will lockout with code 9 after 30 seconds if:
a. The compressor is on in the cooling mode and
the LT1 sensor is colder than the LT2 sensor, or:
b. The compressor is on in the heating mode and
the LT2 sensor is colder than the LT1 sensor.
Swapped LT1/LT2 thermistor code = 9.
ESD (DXM only): The ESD (Emergency Shut Down)
mode can be enabled from an external common signal
to terminal ESD to shut down the unit. The green status
light will flash code 3 when the unit is in ESD mode.
ESD mode = code 3 (green “status” LED)
CXM/DXM Control Start-up Operation - The control
will not operate until all inputs and safety controls are
checked for normal conditions. The compressor will have
a 5 minute anti-short cycle delay at power-up. The first
time after power-up that there is a call for compressor,
the compressor will follow a 5 to 80 second random start
delay. After the random start delay and anti-short cycle
delay, the compressor relay will be energized. On all
subsequent compressor calls, the random start delay is
omitted.
CXM/DXM CONTROLS
Diagnostic Features - The LED on the CXM board
advises the technician of the current status of the CXM
control. The LED can display either the current CXM
mode or the last fault in memory if in test mode. If there
is no fault in memory, the LED will flash Code 1 (when in
test mode).
The green status LED and red fault LED on the DXM
board advise the technician of the current status of the
DXM control. The status LED will indicate the current
mode that the DXM control is in. The fault LED will
ALWAYS flash a code representing the LAST fault in
memory. If there is no fault in memory, the fault LED will
flash Code 1. The yellow test LED will turn on when in
test mode. CAUTION: Do not restart units without
inspection and remedy of faulting condition. Damage
may occur.
27
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Unit Commissioning and Operating Conditions
Environment - This unit is designed for indoor
installation only. Do not install in an area subject to
freezing or where humidity levels can cause cabinet
condensation.
Power Supply - A voltage variation of +/- 10% of
nameplate utilization voltage is acceptable.
Operation and performance is primarily dependent
upon return air temperature, airflow, water temperature,
water flow rate and ambient air temperature. This water
to air heat pump is capable of operating over a wide
temperature range and with flow rates of between 1.5
GPM (.1 l/s) and 3 GPM (.19 l/s) per ton, however usually
no more than one of these factors may be at a minimum
or maximum level at a time.
The commissioning table indicates air and water
temperatures which are suitable for initial unit
commissioning in an environment where the flow rate
and water temperature is not yet stable and to avoid
nuisance shut down of the units freeze and refrigerant
pressure safeties.
The operating table indicates the maximum and
minimum ranges of the unit.
For more specific unit performance reference the product
catalog, the submittal data sheets or contact your
supplier for assistance.
Table 9: Water Temperature Change Through Heat
Exchanger
Table 8: Building Commissioning
BUILDING COMMISSIONING
ALL ERC MODELS
Cooling °F [°C]
Heating °F [°C]
AMBIENT MIN - MAX DB
45-110 [7-43]
40-85 [4.5-29]
RETURN AIR MIN DB/WB
60/45 [16/7]
40 [4.5]
RETURN AIR MAX DB/WB
110/83 [43/28]
80 [27]
STANDARD UNIT ENTERING
WATER MIN* - MAX
40-120 [4.5-49]
60-90 [16-43]
EXTENDED RANGE UNIT**
ENTERING WATER MIN* - MAX
30-120 [-1-49]
20-90 [-6.7-32]
*- Requires optional insulation package when operating below the dew
point
**- Requires antifreeze, optional insulation package and jumper
clipped.
Table 8A: Unit Operating Limits
UNIT OPERATING LIMITS
All ERC Models
Cooling °F [°C]
Heating °F [°C]
AMBIENT MIN - MAX DB
50-100 [10-38]
50-85 [10-29]
RETURN AIR MIN DB/WB
65/60 [18/15.5]
50 [10]
RETURN AIR MAX DB/WB
95/75 [35/24]
80 [27]
STANDARD UNIT ENTERING
WATER MIN* - MAX
50-120 [10-49]
60-90 [16-43]
EXTENDED RANGE UNIT**
ENTERING WATER MIN* - MAX
30-120 [-1-49]
20-90 [-6.7-32]
*- Requires optional insulation package when operating below the dew point
**- Requires antifreeze, optional insulation package and jumper clipped.
28
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Piping System Cleaning and Flushing
Piping System Cleaning and Flushing - Cleaning and
flushing the WLHP piping system is the single most
important step to ensure proper start-up and continued
efficient operation of the system.
Follow the instructions below to properly clean and flush
the system:
1. Ensure that electrical power to the unit is disconnected.
2. Install the system with the supply hose connected
directly to the return riser valve. Use a single length of
flexible hose.
3. Open all air vents. Fill the system with water. DO NOT
allow system to overflow. Bleed all air from the system.
Pressurize and check the system for leaks and repair as
appropriate.
4. Verify that all strainers are in place. A #20 stainless
steel wire mesh strainer is recommended. Start the
pumps, and systematically check each vent to ensure
that all air is bled from the system.
5. Verify that make-up water is available. Adjust make-up
water as required to replace the air which was bled
from the system. Check and adjust the water/air level
in the expansion tank.
6. Set the boiler to raise the loop temperature to
approximately 86°F [30°C]. Open a drain at the
lowest point in the system. Adjust the make-up water
replacement rate to equal the rate of bleed.
7. Refill the system and add trisodium phosphate in
a proportion of approximately one pound per 150
gallons [1/2 kg per 750 l] of water (or other equivalent
approved cleaning agent). Reset the boiler to raise
the loop temperature to 100°F [38°C]. Circulate the
solution for a minimum of 8 to 24 hours. At the end
of this period, shut off the circulating pump and drain
the solution. Repeat system cleaning if desired.
8. When the cleaning process is complete, remove the
short-circuited hoses. Reconnect the hoses to the
proper supply, and return the connections to each of
the units. Refill the system and bleed off all air.
9. Test the system pH with litmus paper. The system
water should be in the range of pH 6.0 - 8.5 (see table
3). Add chemicals, as appropriate to maintain neutral
pH levels.
10. When the system is successfully cleaned, flushed,
refilled and bled, check the main system panels,
safety cutouts and alarms. Set the controls to properly
maintain loop temperatures.
CAUTION!
CAUTION! To avoid possible damage to a plastic (PVC) piping
system, do not allow temperatures to exceed 110ºF (43ºC).
Note: The manufacturer strongly recommends all
piping connections, both internal and external to the
unit, be pressure tested by an appropriate method
prior to any finishing of the interior space or before
access to all connections is limited. Test pressure may
not exceed the maximum allowable pressure for the
unit and all components within the water system.
The manufacturer will not be responsible or liable
for damages from water leaks due to inadequate or
lack of a pressurized leak test, or damages caused
by exceeding the maximum pressure rating during
installation.
DO NOT use “Stop Leak” or similar chemical agent in
this system. Addition of chemicals of this type to the
loop water will foul the heat exchanger and inhibit
unit operation.
29
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Unit and System Checkout Procedure
SYSTEM CHECKOUT
WARNING!
WARNING! Polyolester Oil, commonly known as POE oil, is
a synthetic oil used in many refrigeration systems including
those with HFC-410A refrigerant. POE oil, if it ever comes
in contact with PVC or CPVC piping, may cause failure of
the PVC/CPVC. PVC/CPVC piping should never be used
as supply or return water piping with water source heat
pump products containing HFC-410A as system failures and
property damage may result.
BEFORE POWERING SYSTEM, please check the
following:
UNIT CHECKOUT
Balancing/shutoff valves: Insure that all isolation valves
are open and water control valves are wired.
Line voltage and wiring: Verify that voltage is within
an acceptable range for the unit and wiring and fuses/
breakers are properly sized. Verify that low voltage
wiring is complete.
Unit control transformer: Insure that transformer has
the properly selected voltage tap. Commercial 208230V units are factory wired for 208V operation unless
specified otherwise.
Entering water and air: Insure that entering water and
air temperatures are within operating limits of Table 8.
Low water temperature cutout: Verify that low water
temperature cut-out on the CXM/DXM control is
properly set.
Unit fan: Manually rotate fan to verify free rotation and
insure that blower wheel is secured to the motor shaft.
Be sure to remove any shipping supports if needed.
DO NOT oil motors upon start-up. Fan motors
are pre-oiled at the factory. Check unit fan speed
selection and compare to design requirements.
Condensate line: Verify that condensate line is open
and properly pitched toward drain.
Water flow balancing: Record inlet and outlet water
temperatures for each heat pump upon startup.
This check can eliminate nuisance trip outs and high
velocity water flow that could erode heat exchangers.
Unit air coil and filters: Insure that filter is clean and
accessible. Clean air coil of all manufacturing oils.
Unit controls: Verify that CXM or DXM field selection
options are properly set.
30
System water temperature: Check water temperature
for proper range and also verify heating and cooling
set points for proper operation.
System pH: Check and adjust water pH if necessary
to maintain a level between 6 and 8.5. Proper pH
promotes longevity of hoses and fittings
(see Table 3).
System flushing: Verify that all hoses are connected
end to end when flushing to insure that debris
bypasses the unit heat exchanger, water valves and
other components. Water used in the system must be
potable quality initially and clean of dirt, piping slag,
and strong chemical cleaning agents. Verify that all air
is purged from the system. Air in the system can cause
poor operation or system corrosion.
Cooling tower/boiler: Check equipment for proper set
points and operation.
Standby pumps: Verify that the standby pump is
properly installed and in operating condition.
System controls: Verify that system controls function
and operate in the proper sequence.
Low water temperature cutout: Verify that low water
temperature cut-out controls are provided for the
outdoor portion of the loop. Otherwise, operating
problems may occur.
System control center: Verify that the control center
and alarm panel have appropriate set points and are
operating as designed.
Miscellaneous: Note any questionable aspects of
the installation.
CAUTION!
CAUTION! Verify that ALL water control valves are open and
allow water flow prior to engaging the compressor. Freezing
of the coax or water lines can permanently damage the heat
pump.
CAUTION!
CAUTION! To avoid equipment damage, DO NOT
leave system filled in a building without heat during the
winter unless antifreeze is added to the water loop. Heat
exchangers never fully drain by themselves and will freeze
unless winterized with antifreeze.
NOTICE! Failure to remove shipping brackets from
spring-mounted compressors will cause excessive
noise, and could cause component failure due to
added vibration.
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Unit Start-Up Procedure
Unit Start-up Procedure
1. Turn the thermostat fan position to “ON”. Blower
should start.
2. Balance air flow at registers.
3. Adjust all valves to their full open positions. Turn on
the line power to all heat pumps.
4. Room temperature should be within the minimummaximum ranges of table 8. During start-up checks,
loop water temperature entering the heat pump
should be between 60°F [16°C] and 95°F [35°C].
5. Two factors determine the operating limits of
Enertech heat pumps, (a) return air temperature,
and (b) water temperature. When any one of these
factors is at a minimum or maximum level, the other
factor must be at normal level to insure proper unit
operation.
a. Adjust the unit thermostat to the warmest
setting. Place the thermostat mode switch in the
“COOL” position. Slowly reduce thermostat
setting until the compressor activates.
b. Check for cool air delivery at the unit grille
within a few minutes after the unit has begun to
operate.
Note: Units have a five minute time delay in the
control circuit that can be eliminated on the CXM/
DXM control board as shown below in Figure 8. See
controls description for details.
c. Check the elevation and cleanliness of the
condensate lines. Dripping may be a sign of a
blocked line. Check that the condensate trap is
filled to provide a water seal.
d. Refer to Table 9. Check the temperature of
both entering and leaving water. If temperature
is within range, proceed with the test. If
temperature is outside of the operating range,
check refrigerant pressures.
e. Check air temperature drop across the air coil
when compressor is operating. Air temperature
drop should be between 15°F and 25°F [8°C
and 14°C].
f. Turn thermostat to “OFF” position. A hissing
noise indicates proper functioning of the
reversing valve.
6. Allow five (5) minutes between tests for pressure to
equalize before beginning heating test.
a. Adjust the thermostat to the lowest setting.
Place the thermostat mode switch in the
“HEAT” position.
b. Slowly raise the thermostat to a higher
temperature until the compressor activates.
c. Check for warm air delivery within a few minutes
after the unit has begun to operate.
d. Refer to Table 9. Check the temperature of
both entering and leaving water. If temperature
is within range, proceed with the test. If
temperature is outside of the operating range,
check refrigerant pressures.
e. Check air temperature rise across the air coil
when compressor is operating. Air temperature
rise should be between 20°F and 30°F [11°C
and 17°C].
f. Check for vibration, noise, and water leaks.
7. If unit fails to operate, perform troubleshooting
analysis (see troubleshooting section). If the check
described fails to reveal the problem and the unit
still does not operate, contact a trained service
technician to insure proper diagnosis and repair of the
equipment.
8. When testing is complete, set system to maintain
desired comfort level.
9. BE CERTAIN TO FILL OUT AND FORWARD ALL
WARRANTY REGISTRATION PAPERS TO ENERTECH.
Note: If performance during any mode appears
abnormal, refer to the CXM/DXM section or
troubleshooting section of this manual. To obtain
maximum performance, the air coil should be cleaned
before start-up. A 10% solution of dishwasher
detergent and water is recommended.
WARNING
WARNING! When the disconnect switch is closed, high
voltage is present in some areas of the electrical panel.
Exercise caution when working with energized equipment.
CAUTION!
CAUTION! Verify that ALL water control valves are open and
allow water flow prior to engaging the compressor. Freezing
of the coax or water lines can permanently damage the heat
pump.
Figure 8: Test Mode Pins
Short test pins together to enter
Test Mode and speed-up timing
and delays for 20 minutes.
LT1
LT2
31
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Unit Operating Conditions
NOTE: Table 10 includes the following notes:
• Airflow is at nominal (rated) conditions;
• Entering air is based upon 70°F [21°C] DB in heating
and 80/67°F [27/19°C] in cooling;
• Subcooling is based upon head pressure at compressor
service port;
• Cooling air and water values can vary greatly with
changes in humidity level.
Table 10: ERC Series Typical Operating Pressures and Temperatures
ERC09
Full Load Cooling
Full Load Heating
Entering
Water
Temp °F
Water
Flow
GPM/
Ton
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Rise °F
Air Temp
Drop °F
DB
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Drop °F
Air
Temp
Rise °F
DB
30
1.4
2
2.75
126-136
126-136
126-136
161-181
146-166
131-151
17-22
17-22
17-22
8-13
7-12
6-11
19.8-21.8
14.9-16.9
9.9-11.9
21-27
21-27
21-27
74-84
77-87
79-89
278-298
280-300
283-303
6-11
6-11
6-11
4-9
4-9
3-8
6.1-8.1
4.5-6.5
2.8-4.8
18-24
18-24
19-25
50
1.4
2
2.75
132-142
132-142
132-142
215-235
200-220
185-205
10-15
10-15
10-15
8-13
7-12
6-11
18.8-20.8
14.4-16.1
9.4-11.4
20-26
20-26
20-26
104-114
106-116
108-118
309-329
312-332
315-335
8-12
8-12
8-12
7-12
7-12
7-12
9.6-11.6
7-9
4.5-6.5
24-30
24-30
25-31
70
1.4
2
2.75
138-148
138-148
137-147
278-298
263-283
248-268
8-13
8-13
8-13
9-14
8-13
7-12
17.7-19.7
13.1-15.1
8.5-10.5
19-25
19-25
19-25
127-137
132-142
138-148
332-352
340-360
341-367
10-15
11-16
13-18
10-15
10-15
10-15
12-14
9-10
6.1-8.1
29-35
29-35
30-36
90
1.4
2
2.75
142-152
142-152
142-152
365-385
351-371
337-357
8-13
8-13
8-13
9-14
8-13
7-12
16-18
12-14
8-10
18-24
18-24
18-24
164-174
165-175
167-177
372-392
375-395
379-399
17-22
18-23
19-24
13-18
13-18
13-18
14.5-16.5
11.2-13.2
7.9-9.9
35-41
35-41
36-42
110
1.4
2
2.75
150-160
150-160
150-160
439-459
439-459
439-459
7-12
7-12
7-12
9-14
8-13
7-12
14.2-16.2
10.6-12.6
6.9-8.9
17-23
17-23
17-23
ERC12
Full Load Cooling
Full Load Heating
Entering
Water
Temp °F
Water
Flow
GPM/
Ton
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Rise °F
Air Temp
Drop °F
DB
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Drop °F
Air
Temp
Rise °F
DB
30
1.75
2.6
3.5
98-108
98-108
99-109
140-160
135-155
127-148
36-41
36-41
36-41
14-19
12-17
10-15
17.1-19.1
12.5-14.5
7.9-9.9
19-25
19-25
19-25
72-82
85-95
78-88
301-321
304-324
308-328
9-14
9-14
9-14
12-17
12-17
12-17
6.5-8.5
4.7-6.7
2.9-4.9
21-27
21-27
22-28
50
1.75
2.6
3.5
118-128
118-128
118-128
215-235
200-220
185-205
22-27
22-27
22-27
14-19
12-17
10-15
18.1-20.1
13.1-15.1
8.1-10.1
20-26
20-26
19-25
100-110
98-108
95-105
337-357
334-354
332-352
10-15
10-15
11-16
15-20
15-20
15-20
9.5-11.5
6.6-8.6
3.8-5.8
26-32
26-32
26-32
70
1.75
2.6
3.5
132-142
132-142
132-142
300-320
263-282
245-265
11-16
11-16
12-17
12-17
10-15
7-12
17-19
12.6-14.6
8.2-10.2
19-25
19-25
19-25
115-125
112-122
110-120
361-381
360-380
356-376
19-24
20-25
21-26
18-23
18-23
18-23
11.1-13.1
8-10
4.8-6.8
29-35
29-35
29-35
90
1.75
2.6
3.5
138-148
138-148
138-148
366-386
353-373
340-360
9-14
9-14
9-14
11-16
9-14
6-11
15.8-17.8
14.9-16.9
14-16
18-24
18-24
18-24
122-132
123-133
124-134
376-396
378-398
380-400
34-39
36-41
38-43
22-27
22-27
23-28
12.1-14.1
9-11
5.8-7.8
32-38
32-38
32-38
110
1.75
2.6
3.5
145-155
145-155
145-155
453-473
442-462
431-451
9-14
9-14
9-14
9-14
7-12
5-10
14.7-16.7
10.8-12.8
6.8-8.8
16-22
16-22
17-23
32
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Unit Operating Conditions
Table 10: ERC Series Typical Operating Pressures and Temperatures
ERC15
Full Load Cooling
Entering
Water
Temp °F
Water
Flow
GPM/
ton
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
30
2.1
3.15
4.2
98-108
98-108
99-109
140-160
135-155
127-148
50
2.1
3.15
4.2
118-128
118-128
118-128
70
2.1
3.15
4.2
90
110
Subcooling
Air Temp
Drop °F
DB
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Drop
°F
Air
Temp
Rise °F
DB
36-41
36-41
36-41
14-19
12-17
10-15
17.1-19.1
12.5-14.5
7.9-9.9
19-25
19-25
19-25
74-84
77-87
79-89
278-298
280-300
283-303
6-11
6-11
6-11
4-9
4-9
3-8
6.1-8.1
4.5-6.5
2.8-4.8
18-24
18-24
19-25
215-235
200-220
185-205
22-27
22-27
22-27
14-19
12-17
10-15
18.1-20.1
13.1-15.1
8.1-10.1
20-26
20-26
19-25
104-114
106-116
108-118
309-329
312-332
315-335
8-12
8-12
8-12
7-12
7-12
7-12
9.6-11.6
7-9
4.5-6.5
24-30
24-30
25-31
132-142
132-142
132-142
300-320
263-282
245-265
11-16
11-16
12-17
12-17
10-15
7-12
17-19
12.6-14.6
8.2-10.2
19-25
19-25
19-25
127-137
132-142
138-148
332-352
340-360
347-367
10-15
11-16
13-18
10-15
10-15
10-15
12-14
9-10
6.1-8.1
29-35
29-35
30-36
2.1
3.15
4.2
138-148
138-148
138-148
366-386
353-373
340-360
9-14
9-14
9-14
11-16
9-14
6-11
15.8-17.8
14.9-16.9
14-16
18-24
18-24
18-24
164-174
165-175
167-177
372-392
375-395
379-399
17-22
18-23
19-24
13-18
13-18
13-18
2.1
3.15
4.2
145-155
145-155
145-155
453-473
442-462
431-451
9-14
9-14
9-14
9-14
7-12
5-10
14.7-16.7
10.8-12.8
6.8-8.8
16-22
16-22
17-23
Water
Flow
GPM/
ton
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Rise °F
Air Temp
Drop °F
DB
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat
Subcooling
Water
Temp
Drop
°F
Air
Temp
Rise °F
DB
2.5
3.75
5
98-108
98-108
99-109
140-160
135-155
127-148
36-41
36-41
36-41
14-19
12-17
10-15
17.1-19.1
12.5-14.5
7.9-9.9
19-25
19-25
19-25
74-84
77-87
79-89
278-298
280-300
283-303
6-11
6-11
6-11
4-9
4-9
3-8
6.1-8.1
4.5-6.5
2.8-4.8
18-24
18-24
19-25
2.5
3.75
5
118-128
118-128
118-128
215-235
200-220
185-205
22-27
22-27
22-27
14-19
12-17
10-15
18.1-20.1
13.1-15.1
8.1-10.1
20-26
20-26
19-25
104-114
106-116
108-118
309-329
312-332
315-335
8-12
8-12
8-12
7-12
7-12
7-12
9.6-11.6
7-9
4.5-6.5
24-30
24-30
25-31
2.5
3.75
5
132-142
132-142
132-142
300-320
263-282
245-265
11-16
11-16
12-17
12-17
10-15
7-12
17-19
12.6-14.6
8.2-10.2
19-25
19-25
19-25
127-137
132-142
138-148
332-352
340-360
347-367
10-15
11-16
13-18
10-15
10-15
10-15
12-14
9-10
6.1-8.1
29-35
29-35
30-36
2.5
3.75
5
138-148
138-148
138-148
366-386
353-373
340-360
9-14
9-14
9-14
11-16
9-14
6-11
15.8-17.8
14.9-16.9
14-16
18-24
18-24
18-24
164-174
165-175
167-177
372-392
375-395
379-399
17-22
18-23
19-24
13-18
13-18
13-18
14.5-16.5
11.2-13.2
7.9-9.9
35-41
35-41
36-42
2.5
3.75
5
145-155
145-155
145-155
453-473
442-462
431-451
9-14
9-14
9-14
9-14
7-12
5-10
14.7-16.7
10.8-12.8
6.8-8.8
16-22
16-22
17-23
ERC18
Entering
Water
Temp °F
30
50
70
90
110
Full Load Heating
Water
Temp
Rise °F
Full Load Cooling
14.5-16.5 35-41
11.2-13.2 35-41
7.9-9.9 36-42
Full Load Heating
Table 11: Coax Water Pressure Drop
Model GPM
Pressure Drop, PSI
30°F
50°F
70°F
90°F
PD Added for
Motorized Water Valve
ERC09
1.1
1.6
2.3
1.6
2.6
4.5
1.2
2.2
3.8
1.0
2.0
3.5
0.9
1.9
3
0.3
0.6
1.2
ERC12
1.5
2.3
3
2.1
4.5
6.8
1.8
3.8
5.8
1.5
3.5
4.9
1.3
3
4.5
0.5
1.2
2.2
ERC15
1.9
2.8
3.7
1.5
3
4.7
1
2.3
3.9
0.9
2
3.3
0.8
1.7
2.9
0.7
1.7
3.3
ERC18
2.3
3.4
4.5
2.2
4.4
6.9
1.8
3.8
6
1.5
3.4
5.2
1.3
3
4.8
0.2
0.6
1.1
33
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Start-Up Log Sheet
Installer: Complete unit and system checkout and follow unit start-up procedures in the IOM. Use this form
to record unit information, temperatures and pressures during start-up. Keep this form for future reference.
Job Name:
Street Address:
Model Number:
Serial Number:
Unit Location in Building:
Date:
Sales Order No:
In order to minimize troubleshooting and costly system failures, complete the following checks and data
entries before the system is put into full operation.
Temperatures: F or C
Pressures: PSIG or kPa
Antifreeze: __________________%
Type __________________
Cooling Mode
Heating Mode
Return-Air Temperature DB
Supply-Air Temperature DB
Temperature Differential
Entering Fluid Temperature
Leaving Fluid Temperature
Temperature Differential
Water Coil Heat Exchanger
(Water Pressure IN)
Water Coil Heat Exchanger
(Water Pressure OUT)
Pressure Differential
Flow Rate GPM (l/s)
Supply Voltage at Contactor
Transformer Low Side Volts
Compressor Amps
Motor Amps
Allow unit to run 15 minutes in each mode before taking data.
Do not connect service manifold gauges during start up unless instructed by Enertech service tech.
34
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Preventive Maintenance
Water Coil Maintenance (Direct ground water applications only)
If the system is installed in an area with a known high
mineral content (125 P.P.M. or greater) in the water, it is
best to establish a periodic maintenance schedule with
the owner so the coil can be checked regularly. Consult
the well water applications section of this manual for
a more detailed water coil material selection. Should
periodic coil cleaning be necessary, use standard coil
cleaning procedures, which are compatible with the heat
exchanger material and copper water lines. Generally,
the more water flowing through the unit, the less chance
for scaling. Therefore, 1.5 gpm per ton [2.0 l/m per kW]
is recommended as a minimum flow. Minimum flow rate
for entering water temperatures below 50°F [10°C] is 2.0
gpm per ton [2.6 l/m per kW].
Water Coil Maintenance (All other water loop applications)
Generally water coil maintenance is not needed for
closed loop systems. However, if the piping is known to
have high dirt or debris content, it is best to establish a
periodic maintenance schedule with the owner so the
water coil can be checked regularly. Dirty installations are
typically the result of deterioration of iron or galvanized
piping or components in the system. Open cooling
towers requiring heavy chemical treatment and mineral
buildup through water use can also contribute to higher
maintenance. Should periodic coil cleaning be necessary,
use standard coil cleaning procedures, which are
compatible with both the heat exchanger material and
copper water lines. Generally, the more water flowing
through the unit, the less chance for scaling. However,
flow rates over 3 gpm per ton (3.9 l/m per kW) can
produce water (or debris) velocities that can erode the
heat exchanger wall and ultimately produce leaks.
Filters - Filters must be clean to obtain maximum
performance. Filters should be inspected every month
under normal operating conditions and be replaced
when necessary. Units should never be operated without
a filter.
Condensate Drain - In areas where airborne bacteria
may produce a “slimy” substance in the drain pan, it may
be necessary to treat the drain pan chemically with an
algaecide approximately every three months to minimize
the problem. The condensate pan may also need to
be cleaned periodically to insure indoor air quality. The
condensate drain can pick up lint and dirt, especially with
dirty filters. Inspect the drain twice a year to avoid the
possibility of plugging and eventual overflow.
Compressor - Conduct annual amperage checks to
insure that amp draw is no more than 10% greater than
indicated on the serial plate data.
Fan Motors - All units have lubricated fan motors. Fan
motors should never be lubricated unless obvious, dry
operation is suspected. Periodic maintenance oiling is
not recommended, as it will result in dirt accumulating in
the excess oil and cause eventual motor failure. Conduct
annual dry operation check and amperage check to
insure amp draw is no more than 10% greater than
indicated on serial plate data.
Air Coil - The air coil must be cleaned to obtain
maximum performance. Check once a year under normal
operating conditions and, if dirty, brush or vacuum clean.
Care must be taken not to damage the aluminum fins
while cleaning. CAUTION: Fin edges are sharp.
Cabinet - Do not allow water to stay in contact with the
cabinet for long periods of time to prevent corrosion
of the cabinet sheet metal. The cabinet can be cleaned
using a mild detergent.
Refrigerant System - To maintain sealed circuit integrity,
do not install service gauges unless unit operation
appears abnormal. Reference the operating charts for
pressures and temperatures. Verify that air and water flow
rates are at proper levels before servicing the refrigerant
circuit.
Washable, high efficiency, electrostatic filters, when dirty,
can exhibit a very high pressure drop for the fan motor
and reduce air flow, resulting in poor performance. It is
especially important to provide consistent washing of
these filters (in the opposite direction of the normal air
flow) once per month using a high pressure wash similar
to those found at self-serve car washes.
35
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Functional Troubleshooting
Fault
Main power problems
HP Fault
Code 2
Htg Clg Possible Cause
Solution
Air temperature out of range in heating
Overcharged with refrigerant
Bad HP Switch
Insufficient charge
Check line voltage circuit breaker and disconnect.
Check for line voltage between L1 and L2 on the contactor.
Check for 24VAC between R and C on CXM/DXM'
Check primary/secondary voltage on transformer.
Check pump operation or valve operation/setting.
Check water flow adjust to proper flow rate.
Bring water temp within design parameters.
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
Dirty Air Coil- construction dust etc.
Too high of external static. Check static vs blower table.
Bring return air temp within design parameters.
Check superheat/subcooling vs typical operating condition table.
Check switch continuity and operation. Replace.
Check for refrigerant leaks
X
Compressor pump down at start-up
Check charge and start-up water flow.
X
Reduced or no water flow in heating
X
X
Inadequate antifreeze level
Improper temperature limit setting (30°F vs
10°F [-1°C vs -2°C])
Water Temperature out of range
Bad thermistor
X
Reduced or no air flow in cooling
X
X
X
X
Air Temperature out of range
Improper temperature limit setting (30°F vs
10°F [-1°C vs -12°C])
Bad thermistor
Blocked drain
Improper trap
X
Poor drainage
X
x
X
X
X
Moisture on sensor
Plugged air filter
Restricted Return Air Flow
X
X
Under Voltage
X
X
Over Voltage
X
X
Green Status LED Off
X
Reduced or no water flow in cooling
X
Water Temperature out of range in cooling
X
Reduced or no air flow in heating
High Pressure
LP/LOC Fault
Code 3
X
X
X
X
X
X
X
Low Pressure / Loss of Charge
LT1 Fault
Code 4
Water coil low
temperature limit
X
X
X
LT2 Fault
Code 5
Air coil low
temperature limit
X
X
X
X
Condensate Fault
Code 6
Over/Under
Voltage Code 7
(Auto resetting)
Unit Performance Sentinel
Code 8
Swapped Thermistor
Code 9
No Fault Code Shown
Unit Short Cycles
Only Fan Runs
Only Compressor Runs
Unit Doesn’t Operate
in Cooling
36
X
X
Heating mode LT2>125°F [52°C]
Cooling Mode LT1>125°F [52°C] OR LT2<
40ºF [4ºC])
Check pump operation or water valve operation/setting.
Plugged strainer or filter. Clean or replace..
Check water flow adjust to proper flow rate.
Check antifreeze density with hydrometer.
Clip JW3 jumper for antifreeze (10°F [-12°C]) use.
Bring water temp within design parameters.
Check temp and impedance correlation per chart
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
Too high of external static. Check static vs blower table.
Too much cold vent air? Bring entering air temp within design parameters.
Normal airside applications will require 30°F [-1°C] only.
Check temp and impedance correlation per chart.
Check for blockage and clean drain.
Check trap dimensions and location ahead of vent.
Check for piping slope away from unit.
Check slope of unit toward outlet.
Poor venting. Check vent location.
Check for moisture shorting to air coil.
Replace air filter.
Find and eliminate restriction. Increase return duct and/or grille size.
Check power supply and 24VAC voltage before and during operation.
Check power supply wire size.
Check compressor starting. Need hard start kit?
Check 24VAC and unit transformer tap for correct power supply voltage.
Check power supply voltage and 24VAC before and during operation.
Check 24VAC and unit transformer tap for correct power supply voltage.
Check for poor air flow or overcharged unit.
Check for poor water flow, or air flow.
X
X
LT1 and LT2 swapped
Reverse position of thermistors
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
No compressor operation
Compressor overload
Control board
Dirty air filter
Unit in "test mode"
Unit selection
Compressor overload
Thermostat position
Unit locked out
Compressor Overload
X
X
Thermostat wiring
See "Only Fan Operates".
Check and replace if necessary.
Reset power and check operation.
Check and clean air filter.
Reset power or wait 20 minutes for auto exit.
Unit may be oversized for space. Check sizing for actual load of space.
Check and replace if necessary
Ensure thermostat set for heating or cooling operation.
Check for lockout codes. Reset power.
Check compressor overload. Replace if necessary.
Check thermostat wiring at heat pump. Jumper Y and R for compressor operation
in test mode.
X
X
Thermostat wiring
X
X
X
X
X
X
Fan motor
X
X
Thermostat wiring
Fan motor relay
X
Reversing valve
X
X
Thermostat setup
Thermostat wiring
X
Thermostat wiring
Check G wiring at heat pump. Jumper G and R for fan operation
Jumper G and R for fan operation. Check for Line voltage across BR contacts.
Check fan power enable relay operation (if present).
Check for line voltage at motor. Check capacitor.
Check thermostat wiring at heat pump. Jumper Y and R for compressor operation
in test mode
Set for cooling demand and check 24VAC on RV coil and at CXM/DXM board.
If RV is stuck, run high pressure up by reducing water flow and while operating
engage and disengage RV coil voltage to push valve.
Check for ‘O’ RV setup not ‘B’.
Check O wiring at heat pump. Jumper O and R for RV coil ‘click’.
Put thermostat in cooling mode. Check 24 VAC on O (check between C and
O); check for 24 VAC on W (check between W and C). There should be voltage
on O, but not on W. If voltage is present on W, thermostat may be bad or wired
incorrectly.
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Performance Troubleshooting
Performance Troubleshooting
Htg Clg Possible Cause
X
X
Dirty filter
Solution
Replace or clean.
Check for dirty air filter and clean or replace.
X
Reduced or no air flow in heating
Check fan motor operation and airflow restrictions.
Too high of external static. Check static vs. blower table.
Check for dirty air filter and clean or replace.
X
Reduced or no air flow in cooling
Check fan motor operation and airflow restrictions.
Too high of external static. Check static vs. blower table.
Insufficient capacity/ Not
cooling or heating
Check supply and return air temperatures at the unit and at distant duct registers
if significantly different, duct leaks are present.
X
X
Leaky duct work
X
X
Low refrigerant charge
Check superheat and subcooling per chart.
X
X
Restricted metering device
Check superheat and subcooling per chart. Replace.
X
Defective reversing valve
Perform RV touch test.
X
X
Thermostat improperly located
Check location and for air drafts behind stat.
X
X
Unit undersized
Recheck loads & sizing. Check sensible clg. load and heat pump capacity.
X
X
Scaling in water heat exchanger
Perform scaling check and clean if necessary.
X
X
Inlet water too hot or too cold
Check load, loop sizing, loop backfill, ground moisture.
Check for dirty air filter and clean or replace.
X
Reduced or no air flow in heating
Check fan motor operation and air flow restrictions.
Too high of external static. Check static vs. blower table.
High Head Pressure
X
Reduced or no water flow in cooling
X
Inlet water too hot
X
Check pump operation or valve operation/setting.
Check water flow. Adjust to proper flow rate.
Check load, loop sizing, loop backfill, ground moisture.
Air temperature out of range in heating
Bring return air temperature within design parameters.
X
Scaling in water heat exchanger
Perform scaling check and clean if necessary.
X
X
Unit overcharged
Check superheat and subcooling. Re-weigh in charge.
X
X
Non-condensables in system
Vacuum system and re-weigh in charge.
X
X
Restricted metering device.
Check superheat and subcooling per chart. Replace.
Check pump operation or water valve operation/setting.
X
Reduced water flow in heating.
Plugged strainer or filter. Clean or replace.
X
Water temperature out of range.
Bring water temperature within design parameters.
X
Reduced air flow in cooling.
Check fan motor operation and air flow restrictions.
X
Air temperature out of range
Too much cold vent air? Bring entering air temperature within design parameters.
X
Insufficient charge
Check for refrigerant leaks.
Check water flow. Adjust to proper flow rate.
Low Suction Pressure
Check for dirty air filter and clean or replace.
Too high of external static. Check static vs. blower table.
X
Low Discharge Air Temperature
in Heating
High humidity
X
Too high of air flow
Check fan motor speed selection and air flow chart.
X
Poor performance
See ‘Insufficient Capacity’
X
Too high of air flow
Check fan motor speed selection and airflow chart.
X
Unit oversized
Recheck loads & sizing. Check sensible clg load and heat pump capacity.
37
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Troubleshooting Form
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Note: Never connect refrigerant gauges during startup procedures. Conduct water-side analysis using P/T
ports to determine water flow and temperature difference. If water-side analysis shows poor performance,
refrigerant troubleshooting may be required. Connect refrigerant gauges as a last resort.
38
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
Console (ERC) Series
Created: September 1, 2017
Notes
39
ENERTECH® WATER-SOURCE HEAT PUMPS
Console (ERC) Series
Created: September 1, 2017
Revision History
Date:
9/1/2017
Item:
Action:
First Published
Enertech Global, LLC
2506 Elm Street
Greenville, IL 62246
97B0035N09
Enertech works continually to improve its products. As a result, the design and specifications of each product at the time for order may be changed
without notice and may not be as described herein. Please contact Enertech Technical Service Department at 1-618-664-5860 for specific information
on the current design and specifications. Statements and other information contained herein are not express warranties and do not form the basis of
any bargain between the parties, but are merely Enertech’s opinion or commendation of its products.
40
E n e r t e c h Wa t e r - S o u r c e H e a t P u m p s
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