Johnson Controls JMW340 Installation Operation & Maintenance

Water Source Heat Pumps
Installation, Operation, Maintenance
Supersedes:14806-NOM1-1221
Form: 14806-NOM1-0223
JMW-Series
Water Source Heat Pump
MODELS JMW
3-28 Tons
97B0059N07
Issue Date: February 28, 2023
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Table of Contents
Model Nomenclature
3
General Information
4-5
Unit Physical Data
6
JMW036-120 – Unit Dimensional Data
7
JMW170 & 340 – Unit Dimensional Data
8
Unit Installation
9
Piping Installation
Load Plumbing Installation
Water-Loop Heat Pump Applications
10
11
Ground-Water Heat Pump Applications
12-13
Ground-Loop Heat Pump Applications
14-15
Water Quality Standards
16-19
Electrical – Line Voltage
20
Electrical – Accessories
21
Electrical – Line Voltage
22
Electrical – Low Voltage
23
Wiring Diagram Matrix
24
Controls - CXM2 and DMX2.5
25
Unit & System Checkout
26
Unit Start Up Procedure
27
Operating Pressures
2
9-10
28-29
Preventative Maintenance
30
Start-Up Log Sheet
31
Refrigeration Troubleshooting Form
32
Revision History
36
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Model Nomenclature
1 2
3
JM
4 5 6
W
7
036
A
8
G
9
C
10
1
11
0
12
13
C
0
14
C
15
S
MODEL TYPE
S = STANDARD
JM = JOHNSON CONTROLS
Water to Water
CONFIGURATION
W = WATER TO WATER HEAT PUMP
UNIT SIZE
036 - E,F,G,H
060 - F,G,H,N
120 - F,G,H,N
170 - F,H,N
340 - F,H,N
{
LOAD WATER COIL OPTIONS
C = COPPER
N = CUPRO-NICKEL
AVAILABLE
VOLTAGES
REVISION LEVEL
RESERVED-FOR FUTURE OPTIONS
A = CURRENT 036
B = CURRENT 060, 120, 170, 340
0 = NONE
VOLTAGE
SOURCE WATER COIL OPTIONS
G = 208-230/60/1
E = 265/60/1
H = 208-230/60/3
F = 460/60/3
N = 575/60/3
C = COPPER
N = CUPRO-NICKEL
CONTROLS
Control
CXM2
DXM2.5
CXM2 w/ MPC
DXM2.5 w/ MPC
w/oDisconnect w/Disconnect
C
D
N
P
A
B
R
S
HOT WATER GENERATOR OPTIONS
(JMW036-120 ONLY)
0 = NONE
2 = HWG (COIL ONLY)
CABINET INSULATION
1 = EXTENDED RANGE
2 = EXTENDED RANGE w/Sound Attenuation Package
Installation, Operation, Maintenance
3
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
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.
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! 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! ⚠
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.
⚠ WARNING! ⚠
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.
⚠ 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
can quickly become clogged with construction dirt and debris,
which may cause system damage and void product warranty.
⚠ WARNING! ⚠
WARNING! This product can expose you to chemicals
including formaldehyde, which is known to the state of
California to cause cancer. For more information, go to
www.P65Warnings.ca.gov.
4
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
General Information, Cont’d.
Inspection - Upon receipt of the equipment, carefully
check the shipment against the bill of lading. Make sure
all units have been received. Inspect the carton or crating
of each unit, and inspect each unit for damage. Assure
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 the Johnson Controls Customer Service 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. Do not stack JMW170 or 340. The
stack limit for JMW036, 060 and 120 is three.
Unit Protection - Cover units on the job site with
either shipping packaging, vinyl film, 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.
⚠ CAUTION! ⚠
CAUTION! All three phase scroll compressors must have
direction of rotation verified at start-up. Verification is
achieved by checking compressor Amp draw. Amp draw
will be substantially lower compared to nameplate values.
Additionally, reverse rotation results in an elevated sound
level compared to correct rotation. Reverse rotation will result
in compressor internal overload trip within several minutes.
Verify compressor type before proceeding.
⚠ 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 will 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 trash
found in or on these components.
Pre-Installation - Installation, Operation, and
Maintenance instructions are provided with each unit..
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.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate
Twith ordering and shipping information to verify that
the correct unit has been shipped.
2. Keep the cabinet covered with the shipping 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.
Installation, Operation, Maintenance
5
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Unit Physical Data
Model
JMW036
Compressor (qty)
JMW060
Scroll (1)
Factory Charge R410A (lbs) [kg] / Circuit
JMW120
JMW170
Scroll (2)
Scroll (1)
Scroll (2)
14.9 [6.75]
14.9 [6.75]
4.5 [2.04]
5.5 [2.49]
5.5 [2.49]
Indoor / Load Water connection sizes FPT (in)
3/4”
1”
1-1/2”
Outdoor / Source Water connection Size FPT (in)
3/4”
1”
1-1/2”
HWG Water In/Out IPT (in)
JMW340
2”
2”
1/2”
N/A
Weight - Operating (lbs) [kg]
348 [158]
360 [163]
726 [329]
790 [358]
1330 [603]
Weight - Shipping (lbs) [kg]
373 [169]
385 [175]
770 [349]
800 [363]
1340 [608]
0.96 (3.64)
1.33 (5.04)
2.65 (10.02)
3.50 (13.27)
6.72 (25.44)
Water Volume (Source)
Gallons (LIters)
Dual isolated compressor mounting
Balanced port expansion valve (TXV)
Compressor on (green) and fault (red) light
Dual isolated compressor mounting
Balanced port expansion valve (TXV)
Insulated Source and Load Water Coils standard
Insulated Refrigerant Circuit standard
Compressor on (green) and fault (red) light
Unit Maximum Water Working Pressure
Options
Max Working Pressure PSIG [kPa]
Base Unit
300 [2,068]
Motorized Valves
400 [2,758]
6
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
JMW036-120 – Unit Dimensional Data
B
1.8
(4.6 cm)
A
5
C
JMW
036-060
K
Required
Service Access
Optional
Service Access
5
1.0
(2.5 cm)
F
2
L
K
G
H
Required
Service Access
D
036-060
2
D
E
C
Source
Source
Height (Outdoor) (Outdoor)
Water In Water Out
A
Depth
B
Width
in.
30.6
25.4
33
cm.
77.8
64.5
in.
30.6
52.9
cm.
77.8
134.4
1
4
2.9
(7.4 cm)
4.0
Required
Service Access
Water Connections
1
6
(10.1 cm)
3 Ft
Notes 1 & 2
Optional
Service Access
Overall Cabinet
3
JMW 120
M
3 Ft
Notes 1 & 2
3 Ft
Notes 1 & 2
Water to
Water
L
K
E
1
(4.3 cm)
2
C
Required
Service Acce
5
2.7
(6.9 cm)
J
3 Ft
Notes 11.7
&2
A
1.3
(3.3 cm)
3
L
7.2
(18.3 cm)
Optional
Service Access
B
4
120
3 Ft
Notes 1 & 2
3 Ft
Notes 1 & 2
JMW
036-060
M
D
6
1.0
(2.5 cm)
J
K
1.8
(4.6 cm)
A
H
2. While clear access to all removable panels is not
required, installer should take care to comply with
Call building codes and allow adequate clearance for
JMW 120
future field services.
M
E
1
3 Ft
Notes 1 & 2
G
F
2
L
1
(3.3 cm)
3
M
3
1. Front & side access is preferred for service access.
However, all components may be serviced from
the front access panel if side access is not avail1.3
able.
4
1.0
(2.5 cm)
5
2.7
(6.9 cm)
Notes:
6
1.0
(2.5 cm)
A
B
Electric Access Plugs
3
4
5
6
F
Load
(Indoor)
Water In
G
Load
(Indoor)
Water Out
H
HWG
Water In
J
HWG
Water
Out
K
Low
Voltage
L
External
Pump
M
Power
Supply
2.7
9.4
19.4
24.5
27.9
30.4
20.9
22.9
30.9
83.8
6.9
23.9
49.3
62.2
70.9
77.2
53.1
58.2
78.5
37
25.2
25.2
30.1
30.1
34.9
34.9
29.9
31.9
34.4
94
64.0
64.0
76.5
76.5
88.6
88.6
75.9
81.0
87.4
Installation, Operation, Maintenance
7
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
JMW170 & 340 – Unit Dimensional Data
Source
Load
Top
Header
Access
Panel
12.3
[313]
15.0
[381]
4.5
[114]
5.4
[138]
15.0
[381]
Refrig.
Circuit
Access
Panel
Power Supply Wiring
1.375 x
2.0
[ 34.9 x
50.8] Double KO
Top
View
21.0
[533]
4.3
[108]
Control Wiring
1.125 x
1.375
[ 28.6 x
34.9] Double KO
4.5
[114]
2” IPT Water Connections
Side
4.3
[108]
Optional (Single Unit)
3ft. (91cm) Additional
Service Access
Fault/Run Lights
64.5
[1638]
Left
Side
View
45.1
[1146]
Front
View
26.3
[669]
Notes: 1. Dimensions shown in inches and [millimeters].
2. For multiple units placed side by side, allow
sufficient space front or back to remove unit.
8
Electrical
Access
Panel
Installation, Operation, Maintenance
Compressor
Access
Panel
Front
Minimum
3ft. [91cm]
Required Service
Access
NOTE 2
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Unit Installation
JMW Unit Location - These units are not designed for
outdoor installation. Locate the unit in an INDOOR area
that allows enough space for service personnel to perform
typical maintenance or repairs.
The installation of water source heat pump units 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.
Locate the unit in an indoor area that allows easy removal
of access panels, and has enough space for service
personnel to perform maintenance or repair. Provide
sufficient room to make water and electrical connections..
Any access panel screws that would be difficult to remove
after the unit is installed should be removed prior to
setting the unit. These units are not approved for outdoor
installation and, therefore, must be installed inside the
structure being conditioned. Do not locate in areas where
ambient conditions are not maintained within 40-100°F
[4-38°C].
PIPING INSTALLATION
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. 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
and causes a slight kink.
Note: When anti-freeze is used in the loop, assure
that it is compatible with Teflon tape or pipe joint
compound employed.
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.
⚠ WARNING! ⚠
⚠ WARNING! ⚠
WARNING! Piping must comply with all applicable codes.
WARNING! Do not bend or kink supply lines or hoses.
Insulation is not required on loop water piping except
where the piping runs through unheated areas or outside
the building or when the loop water temperature is
below the minimum expected dew point of the pipe
ambient temperature. Insulation is required if loop water
temperature drops below the dew point.
Pipe joint compound is not necessary when Teflon
threaded 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
pipe threads of the fitting adapters. Prevent sealant from
reaching the flared surfaces of the joint.
Installation, Operation, Maintenance
9
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Piping Installation
⚠ 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! Corrosive system water requires corrosion
resistant fittings and hoses and possibly water treatment.
Optional pressure-rated hose assemblies designed
specifically for use with Johnson Controls units 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 1 for an illustration of a Supply/Return
Hose Kit. Male adapters secure hose assemblies to the
unit and risers. Install hose assemblies properly and
check them regularly to avoid system failure and reduced
service life.
Figure 1: Supply/Return Hose Kit
Rib Crimped
MPT
Swivel
Brass
Fitting
Length
(0.6m Length Standard)
Brass
Fitting
MPT
LOAD PLUMBING INSTALLATION
JMW Unit Load Plumbing - The applications are too
varied to describe in this document. However, some basic
guidelines will be presented. Much of the discussions
on water loop applications would be valid for the load
plumbing discussion as well. All plumbing should conform
to local codes with the following considerations:
Wide temperature variation applications such as
heating/cooling coils:
- Employ piping materials that are rated for the
maximum temperature and pressure combination.
This excludes PVC for most heating applications.
- Insure that load water flow in high temperature
heating applications is at least 3 gpm per ton [3.9 l/m
per kW] to improve performance and reduce nuisance
high pressure faults.
- DO NOT employ plastic to metal threaded joints
- Utilize a pressure tank and air separator vent system to
equalize pressure and remove air.
Swivel
Brass
Note: The manufacturer strongly recommends
Brass all piping
Fitting
Rib Crimped
Fitting
connections, both internal and external to the unit, be
pressure tested by an appropriate method prior to any
finishing of the interior space
Lengthor before access to all
(2 ft [0.6m] Length Standard)
connections
is
limited.
Test
pressure may not exceed the MPT
MPT
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
Accesorio
Accesorio
Giratorio
caused by exceedingReborde
the maximum
pressure
ratingdeduring
Acanalado
Bronce
de Bronce
installation.
Swimming Pool Hot Tub Applications:
- Load coax should be isolated with secondary heat
exchanger constructed of anti-corrosion material in all
chlorine/bromine fluid applications.
Potable Water Applications:
- Potable water systems require field supplied external
secondary heat exchanger.
- Insure load water flow in high temperature heating
applications is at least 3 gpm per ton to improve
performance & reduce nuissance to high pressure faults.
10
Longitud
MPT
(Long. Estándar
de 2 Application
pies)
Figure
2: Typical Water
Loop
Installation, Operation, Maintenance
Load Connections
(Hot Water/Chilled Water)
MPT
Source Connections
(Boiler/Tower,
Geothermal Loop)
Power Disconnect
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Water-Loop Heat Pump Applications
Commercial systems typically include a number of units
plumbed 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. Metal to plastic threaded joints
should never be employed due to their tendency to leak
over time. Teflon tape thread sealant is recommended for
FPT water connections (commercial class) to minimize
internal fouling of the heat exchanger. Do not overtighten
connections and route piping so as not to interfere with
service or maintenance access. Hose kits are available
from Johnson Controls in different configurations as shown
in Figure 2 for connection between the JMW Series and
the piping system. The hose kits include shut off valves,
P/T plugs for performance measurement, high pressure
stainless steel braid hose, "Y" type strainer 20 mesh
(841 micron) [0.84mm]) with blowdown valve, and "J"
type swivel connection. Balancing valves to facilitate the
balancing of the system, 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 later in this
document. The flow rate is usually set between 2.25 gpm
and 3 gpm per ton [2.9 l/m and 4.5 l/m per kW] of cooling
capacity. Johnson Controls recommends 2.5 gpm per ton
Figure 3: Typical Open Loop/Well Application
Unit Power
Disconnect
Flow
Water
Control Regulator
Valve
Air Pad or
Extruded
polystyrene
insulation board
[3.2 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.
Cooling Tower/Boiler Systems typically utilize a
common loop maintained 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 - CXM2 or
DXM2.5 Control: When an antifreeze is selected, the
LT1 jumper (JW3) should be clipped to select the low
temperature (Antifreeze 15°F [-9.4°C]) setpoint to avoid
nuisance faults. See Figure 4: Low Water Temperature
Cutout - LT1.
⚠ WARNING! ⚠
WARNING! Never jumper terminal “A” from CXM2 or
DXM2.5 board #1 to CXM2 or DXM2.5 board #2 on multicompressor/control bound units. See Figure 5 in electrical
section of this document for motorized valve wiring.
⚠ CAUTION! ⚠
CAUTION! Many units are installed with a factory or field
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any field provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The field installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from Johnson Controls with a 1/4” internal
flare connection as part number 39B0005N02.
Pressure
Tank
Water Out
Water In
Shut-Off
Valve
Optional
Filter
P/T Plugs
Boiler
Drains
Thermostat Wiring
Installation, Operation, Maintenance
11
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Ground-Water Heat Pump Applications
Typical open loop piping is shown in Figure 3. Shut off
valves should be included in case of servicing. Boiler
drains or other valves should be ‘tee’d’ into the line to
allow acid flushing of just the heat exchanger. Pressure
temperature plugs should be used so that flow 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.
Water quantity should be plentiful and of good quality.
Consult Table 1 for water quality guidelines. The unit can
be ordered with either a copper or cupro-nickel water
heat exchanger. 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, a closed loop system is recommended. It is
recommended to install an intermediate heat exchanger
to isolate an open loop from the heat pump loop on
open well systems. Heat exchangers may over time lose
heat exchange capabilities due to a build up of mineral
deposits inside. These can be cleaned only by a qualified
service mechanic as acid and special pumping equipment
are required.
In areas with extremely hard water, the owner should be
informed that the heat exchanger may require occasional
acid flushing.
Expansion Tank and Pump - Use a closed, bladdertype expansion tank to minimize mineral formation due
to air exposure. The expansion tank should be sized
to handle at least one minute run time of the pump to
prevent premature pump failure using its drawdown
capacity rating. Discharge water from the unit is not
contaminated in any manner and can be disposed of
in various ways depending on local building codes; i.e.
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.
12
⚠ 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.
⚠ WARNING! ⚠
WARNING! Never jumper terminal “A” from CXM2 or
DXM2.5 board #1 to CXM2 or DXM2.5 board #2 on multicompressor/control bound units. See Figure 5 in electrical
section of this document for motorized valve wiring.
Low Water Temperature Cut-Out Setting - For all open
loop systems the 35°F [1.7°C] LT1 setting (factory settingwater) should be used to avoid freeze damage to the unit.
See Figure 4: “Low Water Temperature Cutout - LT1”.
Water Control Valve - Note the placement of the water
control valve. Always maintain water pressure in the
heat exchanger by placing water control valves at the
outlet of the unit to prevent mineral precipitation. Pilot
operated or Taco slow closing valve’s solenoid 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 the Taco slow closing
valve can draw up to 35VA. This can overload smaller 40
or 50 VA transformers depending on the other controls
employed. A typical pilot operated solenoid valve draws
approximately 15VA.
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Ground-Water Heat Pump Applications, Cont’d.
Flow Regulation - Flow regulation can be accomplished
by two methods. First, most water control valves have
a built in flow adjustment. By measuring the pressure
drop through the unit heat exchanger, flow rate can be
determined and compared to Tables 7 and 8. Since the
pressure is constantly varying, two pressure gauges
might be needed. Simply adjust the water control valve
until the desired flow of 1.5 to 2 gpm per ton is achieved.
Secondly, a flow control device may be installed. The
devices are typically an orifice of plastic material that
is designed to allow a specified flow rate. These are
mounted on the outlet of the water control valve. On
occasion, these valves can produce a velocity noise that
can be reduced by applying some back pressure. This
is accomplished by slightly closing the leaving isolation
valve of the well water setup.
⚠ CAUTION! ⚠
CAUTION! Many units are installed with a factory or field
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any field provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The field installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from Johnson Controls with a 1/4” internal
flare connection as part number 39B0005N02.
⚠ CAUTION! ⚠
CAUTION! Low temperature limit system will not allow leaving
load water temperature (cooling mode) or leaving source water
temperature (heating mode) to be below 42°F [5.6°C].
Installation, Operation, Maintenance
13
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Ground-Loop Heat Pump Applications
⚠ CAUTION! ⚠
CAUTION! The following instructions represent industry
accepted installation practices for Closed Loop Earth
Coupled Heat Pump Systems. They are provided to assist
the contractor in installing trouble free ground loops. These
instructions are recommendations only. State 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.
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 only polyethylene fusion for inground sections
of the loop. Galvanized or steel fitting 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 and a flanged fitting
substituted. P/T plugs should be used so that flow can be
measured using the pressure drop of the unit heat exchanger
in lieu of other flow measurement means. Earth loop
temperatures can range between 25 to 110°F [-4 to 43°C],
and 2.25 to 3 gpm of flow per ton [2.9 l/m to 3.9 l/m per kW]
of cooling capacity is recommended in these applications.
Upon completion of the ground loop piping, pressure test the
loop to assure a leak free system. Horizontal Systems: Test
individual loops as installed. Test entire system when all loops
are assembled. Vertical U-Bends and Pond Loop Systems:
Test Vertical U-bends and pond loop assemblies prior to
installation with a test pressure of at least 100 psi [689 kPa].
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. Flush the loop
first with the unit isolated to avoid flushing debris from the
loop into the unit heat exchanger.
Table 2: Antifreeze Percentages by Volume
Type
Methanol
100% USP food grade Propylene Glycol
Ethanol*
Minimum Temperature for Low Temperature Protection
10°F [-12.2°C]
15°F [-9.4°C]
20°F [-6.7°C]
25°F [-3.9°C]
25%
38%
29%
21%
25%
25%
16%
22%
20%
10%
15%
14%
* Must not be denatured with any petroleum based product
Antifreeze - In areas where minimum entering loop
temperatures drop below 40°F [5°C] or where piping will
be routed through areas subject to freezing, anti-freeze
is needed. Alcohols and glycols are commonly used as
antifreezes, however your local sales manager should
be consulted for the antifreeze best suited to your area.
Low temperature protection should be maintained to
15°F [9°C] below the lowest expected entering loop
temperature. For example, if 30°F [-1°C] is the minimum
expected entering loop temperature, the leaving loop
temperature would be 25 to 22°F [-4 to -6°C] and low
temperature protection should be at 15°F [-10°C] e.g. 30°F
- 15°F = 15°F [-1°C - 9°C = -10°C]. All alcohols should
be premixed and pumped from a reservoir outside of the
14
building when possible or introduced under water level to
prevent fuming. Initially 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. Antifreeze
concentration should be checked from a well mixed
sample using a hydrometer to measure specific gravity.
Low Water Temperature Cut-Out Setting CXM2 or DXM2.5 Control: When an antifreeze is selected,
the LT1 jumper [JW3] should be clipped to select the low
temperature (Antifreeze 15°F [-9.4°C]) setpoint to avoid
nuisance faults. See Figure 4.
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Ground-Loop Heat Pump Applications, Cont’d.
Water Control Valve - Note the placement of the water
control valve. Always maintain water pressure in the heat
exchanger by installing water control valves at the source
out of the unit to prevent mineral precipitation. Position
water high pressure switch between unit and valve. Pilot
operated or slow closing valves are recommended to
reduce water hammer. If water hammer persists, a miniexpansion 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, some slow closing valves can draw up to
35VA. This can overload smaller transformers depending
on the other controls employed. A typical pilot operated
solenoid valve draws approximately 15VA.
Flow Regulation - Install on source in of unit. Flow
regulation can be accomplished by two methods. First,
most water control valves have a built in flow adjustment.
By measuring the pressure drop through the unit heat
exchanger, flow rate can be determined and compared
to Table 6. Since the pressure is constantly varying, two
pressure gauges might be needed. Simply adjust the water
control valve until the desired flow of 2.5 to 3 gpm per ton
[2.0 to 2.6 l/m per kW] is achieved. Secondly, a flow control
device may be installed. The devices are typically an orifice
of plastic material that is designed to allow a specified flow
⚠ CAUTION! ⚠
rate. These are mounted on the outlet of the water control
valve. On occasion, these valves can produce a velocity
noise that can be reduced by applying some back pressure.
This is accomplished by slightly closing the leaving isolation
valve of the well water setup.
⚠ WARNING! ⚠
WARNING! Never jumper terminal “A” from CXM2 or
DXM2.5 board #1 to CXM2 or DXM2.5 board #2 on multicompressor/control bound units. See Figure 5 in electrical
section of this document for motorized valve wiring.
⚠ CAUTION! ⚠
CAUTION! Many units are installed with a factory or field
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any field provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The field installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from Johnson Controls with a 1/4” internal
flare connection as part number 39B0005N02.
ELECTRICAL LINE VOLTAGE
⚠ WARNING! ⚠
⚠ WARNING! ⚠
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
General Line Voltage Wiring - Be sure the available
power is the same voltage and phase as that 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.
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.
JMW Power Connection - Line voltage connection is
made by connecting the incoming line voltage wires to L1,
L2, and L3 on power distribution block. Consult electrical
data table for correct fuse size.
208 Volt Operation - All 208-230 Volt units are factory
wired for 208 Volt. The transformers may be switched to
230V operation as illustrated on the wiring diagram by
switching the Red (208V) and the Orange (230V) at the
contactor terminal L2.
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 wiring diagrams for fuse sizes and a
schematic of the field connections which must be made
by the installing (or electrical) contractor.
Consult the unit wiring diagram located on the inside of
the compressor access panel to ensure proper electrical
hookup. All final electrical connections must be made
with a length of flexible conduit to minimize vibration and
sound transmission to the building.
Installation, Operation, Maintenance
15
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Water Quality Standards
Table 2: Water Quality Standards
Clean water is essential to the performance and life span of water source heat pumps. Contaminants, chemicals, and
minerals all have the potential to cause damage to the water heat heat exchanger if not treated properly. All closed water
loop systems should undergo water quality testing and be maintained to the water quality standards listed in this table.
WATER QUALITY REQUIREMENTS
Electrolysis
All HX types
Fouling &
Biological
Corrosion Preven�on
Scaling Poten�al
For Closed-Loop and Open-Loop Systems
16
Descrip�on
Symbol
Units
pH - Chilled Water <85°F
pH - Heated Water >85°F
(HCO3-) ppm - CaCO3 equiv.
Alkalinity
Calcium
(Ca)
ppm
Magnesium
(Mg)
ppm
Total Hardness
(CaCO3) ppm - CaCO3 equiv.
Langelier Satura�on Index LSI
Ryznar Stability Index
RSI
ppm - CaCO3 equiv.
Total Dissolved Solids
(TDS)
(SO42-) ppm
Sulfate
(NO3-) ppm
Nitrate
Chlorine (free)
(Cl)
ppm
Chloride (water < 80°F)
ppm
(Cl )
Chloride (water > 120°F)
ppm
α
Hydrogen Sulfide
(H2S)
ppb
(CO2)
Carbon Dioxide
Iron Oxide
Manganese
Ammonia
Chloramine
Heat Exchanger Type
Closed Loop
Open Loop, Tower, Ground Source Well
Recircula�ng
All Heat Exchanger COAXIAL HX Copper COAXIAL HX Brazed Plate HX
Types
Tube in Tube
Cupronickel
316 SS
7.0 to 9.0
7.0 to 9.0
7.0 to 9.0
7.0 to 9.0
8.0 to 10.0
8.0 to 10.0
8.0 to 10.0
8.0 to 10.0
50 to 500
50 to 500
50 to 500
50 to 500
<100
<100
<100
<100
<100
<100
<100
<100
30 to 150
150 to 450
150 to 450
150 to 450
-0.5 to +0.5
-0.5 to +0.5
-0.5 to +0.5
-0.5 to +0.5
6.5 to 8.0
6.5 to 8.0
6.5 to 8.0
6.5 to 8.0
<1000
<1000
<1000
<1500
<200
<200
<200
<200
<100
<100
<100
<100
<0.5
<0.5
<0.5
<0.5
<20
<20
<150
<150
<20
<20
<125
<125
<0.5
<0.5
<0.5
<0.5
(Fe)
(Mn)
(NH3)
(NH2CL)
ppm
ppm
ppm
ppm
ppm
0
<1.0
< 0.4
<0.05
0
<50
<1.0
<0.4
<0.1
0
10 to 50
<1.0
<0.4
<0.1
0
10 to 50
<0.2
<0.4
<0.1
0
(TSS)
cells/mL
cells/mL
cells/mL
ppm
0
0
0
<10
0
0
0
<10
0
0
0
<10
0
0
0
<10
Earth Ground Resistanceχ
Ohms
0
Electrolysis Voltage
Leakage Currentδ
mV
mA
<300
<15
Iron Bacteria
Slime Forming Bacteria
Sulfate reducing bacteria
Suspended Solidsβ
δ
Consult NEC & local electrical codes for grounding requirements
Measure voltage internal water loop to HP ground
Measure current in water loop pipe
Building Primary Electrical Ground to unit, must meet local diameter and penetra�on length requirements
Do not connect heat pump to steel pipe unless dissimilar materials are separated by using Di-electric unions. Galvanic corrosion of heat
pump water pipe will occur.
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Water Quality Standards, Cont’d.
1. The Water Quality Table provides water quality
requirements for coaxial & brazed plate heat
exchangers.
2. The water must be evaluated by an independent
testing facility comparing site samples against
this Table. When water properties are outside of
these parameters, the water must either be treated
by a professional water treatment specialist to
bring the water quality within the boundaries of
this specification, or an external secondary heat
exchanger must be used to isolate the heat pump
water system from the unsuitable water. Failure to
do so will void the warranty of the heat pump system
and will limit liability for damage caused by leaks or
system failure.
3. Regular sampling, testing and treatment of the water
is necessary to assure that the water quality remains
within acceptable levels thereby allowing the heat
pump to operate at optimum levels.
4. If closed‐loop systems are turned off for extended
periods, water samples must be tested prior to
operating the system.
5. For optimal performance, it is recommended that the
closed‐loop piping systems are initially filled with de‐
ionized water.
6. Well water with chemistry outside of these
boundaries, and salt water or brackish water requires
an external secondary heat exchanger. Surface/Pond
water should not be used.
7. If water temperature is expected to fall below 40°F,
antifreeze is required. Refer to the heat pump IOM for
the correct solution ratios to prevent freezing.
α
β
χ
δ
Hydrogen Sulfide has an odor of rotten eggs. If one
detects this smell, a test for H2S must be performed.
If H2S is detected above the limit indicated,
remediation is necessary (Consult with your Water
Testing/Treatment Professional) or a secondary heat
exchanger is required using appropriate materials as
recommended by the heat exchanger supplier.
Suspended solids and particulates must be filtered
to prevent fouling and failure of heat exchangers.
Strainers or particulate filters must be installed to
provide a maximum particle size of 600 micron (0.60
mm, 0.023 in.) using a 20 to 30 mesh screen size.
When a loop is installed in areas with fine material
such as sand or clay, further filtration is required to a
maximum of 100 micron. Refer to the Strainer / Filter
Sizing Chart to capture the particle sizes encountered
on the site.
An electrical grounding system using a dedicated
ground rod meeting NEC and Local Electrical
codes must be installed. Building Ground must not
be connected the WSHP piping system or other
plumbing pipes.
Refer to IOM for instructions on measuring resistance
and leakage currents within water loops.
Do not use PVC pipe for water loop (compressor POE
oil and glycols damage PVC) use of HDPE pipe is
recommended.
Strainer / Filter Sizing
Mesh Size
Particle Size
Microns
MM
Inch
20
840
0.840
0.0340
30
533
0.533
0.0210
60
250
0.250
0.0100
100
149
0.149
0.0060
150
100
0.100
0.0040
200
74
0.074
0.0029
ppm = parts per million
ppb = parts per billion
Installation, Operation, Maintenance
17
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Water Quality Standards, Cont’d.
Measuring Earth Ground Resistance
0.02�
Well Casing
Building
Ground Rod
OHM meter
Measure the earth ground bond using an Ohm meter between the building's ground rod and the steel well casing.
The resistance measured should be zero Ohms. The NEC allows a resistance to ground up to 20 Ohms. Any
resistance above zero, indicates a poor earth ground which may be the result of a hot neutral line or that
conduc�ve water is present. Both of these may lead to electrolysis and corrosion of the heat pump piping. A check
for both should be performed and resolved.
Note if the well casing is plas�c, a conduc�ve path can be achieved by inser�ng a #6 AWG bare copper wire into the
well water. Remove the temporary conductor when finished.
18
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Water Quality Standards, Cont’d.
Measuring Electrolysis Voltage and Current
300mV
Heat Pump
Volt Meter
Wire Electrode inserted into port for
Voltage measurement
Pete's Port
Water-in
Water-out
Amp Sensor to VOM for Current
HP Piping
Measure the electrolysis voltage using a volt meter between the heat pump ground and a #14 AWG solid copper
wire electrode inserted into the water using a Pete’s style access port.
The HP must be opera�ng and the water stream flowing.
The voltage measured should be less than 300mV (0.300 V). If higher than 500mV electrolysis will occure and
corrosion will result.
If voltage is measured, the cause is a high resistance earth ground or current on the neutral conductor. Remedial
measures should be performed.
Measure the current flowing through the piping system by using an amp clamp probe on the water-in line. The HP
must be opera�ng and the water stream flowing.
There should be zero amps measured. If current is present, there is leakage current to the plumbing system and it
must be rec�fied to prevent pipe corrosion.
Installation, Operation, Maintenance
19
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Electrical – Line Voltage
JMW Electrical Data
Model
JMW036
JMW060
JMW120
JMW170
JMW340
Voltage
Code
Volatge
Voltage
Min/Max
Qty
RLA
LRA
Total
Unit FLA
Min
Circuit
Amps
SCCR
rms
Symetrical
SCCR
Volts
Maximum
Max
Fuse/
HACR
G
208-230/60/1
187/254
1
16.7
79
16.7
20.8
5
600
35
E
265/60/1
239/292
1
13.5
72
13.5
16.8
5
600
30
H
208-230/60/3
187/254
1
10.4
73
10.4
13.1
5
600
20
Compressor
F
460/60/3
414/506
1
5.8
38
5.8
7.2
5
600
15
N
575/60/3
518/633
1
3.8
36.5
3.8
4.7
5
600
15
G
208-230/60/1
187/254
1
26.3
134
26.3
32.9
5
600
50
H
208-230/60/3
187/254
1
15.6
110
15.6
19.5
5
600
35
F
460/60/3
414/506
1
7.8
52
7.8
9.8
5
600
15
G
208-230/60/1
187/254
2
26.3
134
52.6
59.2
5
600
80
H
208-230/60/3
187/254
2
15.6
110
31.2
35.1
5
600
50
F
460/60/3
414/506
2
7.8
52
15.6
17.6
5
600
25
H
208-230/60/3
187/254
1
53.6
245
53.6
67.0
5
600
110
F
460/60/3
414/506
1
20.7
125
20.7
25.9
5
600
45
N
575/60/3
518/633
1
16.4
100
16.4
20.5
5
600
35
H
208-230/60/3
187/254
2
53.6
245
107.2
120.6
5
600
150
F
460/60/3
414/506
2
20.7
125
41.4
46.6
5
600
60
N
575/60/3
518/633
2
16.4
100
32.8
36.9
5
600
50
ELECTRICAL - LOW VOLTAGE
Figure 4: Changing LT1-Low Water Temperature
Cutout Setpoint
Thermostat Connections - The aquastat/thermostat
should be wired directly to the CXM2/DXM2.5 board #1.
Note: The JMW second stage is wired directly to the CXM2
#2.
Low Water Temperature Cutout - LT1 - The CXM2/
DXM2.5 control allows the field selection of source fluid
low temperature cutout points. The factory setting of
LT1 is set for water (35°F [1.7°C]). In cold temperature
applications jumper JW3 (LT1- antifreeze 15°F [-9.4°C])
should be clipped as shown in Figure 4 to change the
setting to 10°F [-12.2°C], a more suitable temperature
when using antifreezes. Never clip JW3 prior to antifreeze
being added to the loop.
20
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Electrical – Accessories
Accessory Connections - A terminal paralleling the
compressor contactor coil has been provided on the
CXM2/DXM2.5 control of the JMW line. "A" has been
provided to control accessory devices, such as water
valves, electronic air cleaners, humidifiers, etc. Note:
This terminal must be used only with 24 Volt signals
and not line voltage signals. This signal operates with
the compressor contactor. See Figure 8 or the wiring
schematic for details.
24 Volt Accessory Wiring
CXM2/DXM2.5 Terminal Strip
These terminals may be used to
power 24 volt water valves on
units size 036, 060
⚠ WARNING! ⚠
WARNING! Never jumper terminal “A” from CXM2 or
DXM2.5 board #1 to CXM2 or DXM2.5 board #2 on multicompressor/control bound units. See Figure 5 in electrical
section of this document for motorized valve wiring.
Figure 5: Field Wiring of 24 Volt Motorized Valve for Units Size 120-340
Water High
Pressure Switch
NC
Valve
Relay 3
Coil
CXM2
CONTROLLER
VR3
NO
VR3
NO
RED
RED
VR1
8
6
MV
Refrigerant
HP Switch
Circuit #1
RED
RED
4
2
Refrigerant
HP Switch
Circuit #2
VR2
VR1
VR2
Coil
Coil
- - - - - - - Field Wiring (24 VOLT)
MV - Motorized Valve
Notes - Disconnect red wire at refrigerant HP switchconnect to N.O.
contact, connect new red wire from N.O. contact to refrigerant HP switch.
Valve Relay 1, 20 - 13B0001N01 (SPDT) VR1, VR2
contact, connect new red wire from N.O. contact to refrigerant HP switch.
Valve Relay 1, 20 - 13B0001N01 (SPDT) VR1, VR2
Valve Relay 3 - 13B0004N01 (DPDT) VR3
Water High
Pressure Switch
NC
Valve
Relay 3
Coil
DXM2.5
CONTROLLER
VR3
NO
RED
RED
6
MW
8
Refrigerant
HP Switch
Circuit #1
RED
RED
2
4
Refrigerant
HP Switch
Circuit #2
24V
Transformer
Power
Supply
NOTE: SET DIP SWITCH PACKAGE S2 FOR
MOTORIZED VALVE AS PER TABLE
2.4
ON
2.5
OFF
2.6
ON
Installation, Operation, Maintenance
21
Unit Power Supply
See electrical table for
wire and breaker size
CB
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
L2
Grnd
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
CXM Control
Electrical – Line Voltage
Circ Brkr
HWG PB2
T1
T2
Low Voltage
Connector
L1
Yellow
Contactor -C
CXM2
All field installed wiring, including electrical ground, must
L3
comply with the National
Electrical
Code as well as all
Loop PB1
Grnd T2
T1
applicable local codes.
L2
L1
Refer to the unit wiring diagrams
for fuse sizes and a
schematic of the field connections which must be made
by the installing (or electrical) contractor.
Install HWG Pump
Power after insuring
208 water
Voltis Operation
in HWG circuit - All 208-230 Volt units are factory
wired for 208 Volt. The transformers may be switched to
230V operation as illustrated on the wiring diagram. By
switching the Red (230V) and the Orange (208V) at the
External
Pump
contactor
terminal
L2.
Power Supply
See electrical table for
wire and breaker size
Grnd
Consult the unit wiring diagram located on the inside of the
compressor access panel to ensure proper electrical hookup.
Rev .: 01/21/09B
All final electrical connections must be made with a
length of flexible conduit to minimize vibration and sound
transmission to the building.
JMW036-060 Series Line Voltage Field Wiring Commercial Class (3 phase shown)
Contactor -C
L3
CXM2
L2
L1
Grnd
JMW120 Series Line Voltage Field Wiring Commercial Class
CXM2
CXM2
ALL wiring diagrams available at files.hvac-wiringdiagrams.com/JCI/jciwire.html
22
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERG
EFFICIENCY
Rev.:Y
02/16/23B
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Electrical – Low Voltage
Thermostat Connections - The aquastat/thermostat
should be wired directly to the CXM2/DXM2.5 board
as shown in Figure 6a for JMW036-060 and Figure 6b
for the JMW120. Note the JMW second stage is wired
directly to the CXM2 #2.
Figure 6b: JMW120 Low Voltage Field Wiring (CXM2 shown)
L1 L2 L3
Contactor -CC1
Grnd
Figure 6a. JMW036-060 Low Voltage Field Wiring
(CXM2 shown)
Power Distribution
Block
Contactor -CC
Contactor -CC2
L2
Capacitor
CB
L1
Transformer
Transformer
CXM2 Control #1
Low Voltage
Wiring
CXM2
Low Voltage
Connector
CXM2
CXM2 Control
Low Voltage
Connector
CXM2 Control #2
CXM2
Low Voltage
Wiring
Second Stage Call
(Not needed on DXM2.5 Models
all low voltage wires to DXM2.5 #1)
Rev .: 02/16/23B
Rev.: 02/16/23B
Low Water Temperature Cutout - LT1 - The CXM2/
DXM2.5 control allows the field selection of source fluid
low temperature cutout points. The factory setting of LT1
is set for water (30°F). In cold temperature applications
jumper JW3 (LT1- antifreeze 10°F) should be clipped as
shown in Figure 7 to change the setting to 10°F, a more
suitable temperature when using antifreezes. It should be
noted that the extended range option should be specified
to operate the JMW Series at enteringContactor
water
temperatures
L1 L2 L3
-CC1
below 60°F.
Grnd
Figure 7: Changing LT1-Low Water Temperature
Cutout Setpoint
LT1
LT2
CXM2 Board
Power Distribution
Block
Installation, Operation, Maintenance
Contactor -CC2
Low Voltage
Connector
JW3-LT1 jumper
should be clipped when
antifreeze is used.
LT1
LT1
LT2
LT2
23
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Wiring Diagram Matrix
Size
Unit Controller
Voltage
CXM2
208-230/60/1, 265/60/1
208-230/60/3, 460/60/3,
575/60/3
AUX WD CXM2 w/MPC
All
DXM2.5
208-230/60/1, 265/60/1
208-230/60/3, 460/60/3,
575/60/3
96B0402N38
96B0402N39
96B0402N44
96B0402N42
96B0402N50
AUX WD DXM2.5 w/
MPC
All
96B0146N14
96B0402N56
96B0146N16
96B0402N56
24
JMW036-060
96B0401N52
JMW170
JMW120
96B0401N58
JMW340
96B0401N53
96B0146N14
96B0401N61
96B0401N59
96B0401N69
96B0401N76
96B0146N16
96B0401N76
96B0402N41
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Controls – CXM2 and DXM2.5
CXM2 Controls
For detailed controller information, see the CXM2
Application, Operation, and Maintenance (AOM)
manual (part # 97B0137N01). To confirm the
controller type of your particular unit, refer to digit 9
on the unit model number and the unit nomenclature
diagram found on page 3 of this manual.
DXM2.5 Controls
For detailed controller information, see the DXM2.5
Application, Operation, and Maintenance (AOM)
manual (part # 97B0142N01). To confirm the
controller type of your particular unit, refer to digit 9
on the unit model number and the unit nomenclature
diagram found on page 3 of this manual.
Installation, Operation, Maintenance
25
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Unit & System Checkout
⚠ WARNING! ⚠
WARNING! Verify ALL water controls are open and allow
water flow prior to engaging the compressor. Freezing of the
coax or water lines can permanently damage the heat pump.
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.
⚠ 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: Ensure all isolation valves
are open, water control valves wired and open or coax
may freeze and burst.
q Line Voltage and Wiring: Ensure Voltage is within an
acceptable range for the unit and wiring and fuses/
breakers are properly sized. Low voltage wiring is
complete.
q Unit Control Transformer: Ensure transformer has
properly selected control voltage tap. 208-230V units
are factory wired for 208V operation unless specified
otherwise.
q Entering Water: Ensure entering water temperatures are
within operating limits of Table 6.
q Low Water Temperature Cutout: Verify low water
temperature cut-out on CXM2/DXM2.5 is properly set.
q Water Flow Balancing: Verify inlet and outlet water
temperatures on both Load and source are recorded
for each heat pump upon startup. This check can
eliminate nuisance trip outs and high velocity water
flows that can erode heat exchangers.
q Unit Controls: Verify CXM2 or DXM2.5 field selection
options are proper and complete.
26
SYSTEM CHECKOUT
q System Water Temperature: Check load and source
water temperature for proper range and also verify
heating and cooling setpoints for proper operation.
q System pH: System water pH is 6 - 8.5. Proper pH
promotes longevity of hoses and fittings.
q System Flushing: Verify all hoses are connected end
to end when flushing to ensure debris bypasses unit
heat exchanger and water valves etc. Water used in
the system must be potable quality initially and clean
of dirt, piping slag, and strong chemical cleaning
agents. Verify all air is purged from the system. Air
in the system can cause poor operation or system
corrosion.
q Cooling Tower/Boiler: Check equipment for proper
setpoints and operation.
q Standby Pumps: Verify the standby pump is properly
installed and in operating condition.
q System Controls: Verify system controls function and
operate in the proper sequence.
q Low Water Temperature Cutout: Verify low water
temperature cut-out controls are provided for the
outdoor portion of the loop or operating problems
will occur.
q System Control Center: Verify control center and
alarm panel for proper setpoints
and operation.
q Strainers: Verify 20 mesh (841 micron) [0.84mm]
strainers are installed in load and source water
piping. Confirm maintenance schedule for strainers.
q Miscellaneous: Note any questionable aspects of
the installation.
⚠ WARNING! ⚠
WARNING! To avoid equipment damage, DO NOT leave
system filled in a building without heat during the winter
unless antifreeze is added to system water. Condenser
coils never fully drain by themselves and will freeze unless
winterized with antifreeze.
Figure 5: Test Mode Pins
Short test pins together
to enter Test Mode and
speed-up timing and delays
for 20 minutes.
LT1
LT2
CXM2 BOARD
Installation, Operation, Maintenance
LT1
LT1
LT2
LT2
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Unit Start-Up Procedure
⚠ 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.
1. Adjust all valves to their full open position. Turn on the
line power to all heat pump units.
2. Operate each unit in the cooling cycle. Loop water
temperature entering the heat pumps should be
between 70°F [21°C] and 110° F [43°C].
3. Operate each heat pump in the heating cycle
immediately after checking cooling cycle operation.
A time delay will prevent the compressor from restarting for approximately five (5) minutes.
4. Establish a permanent operating record by logging
the unit operating conditions at initial start-up for
each unit.
5. If a unit fails to operate, conduct the following checks:
a. Check the voltage and current. They should
comply with the electrical specifications described
on the unit nameplate.
b. Look for wiring errors. Check for loose terminal
screws where wire connections have been made
on both the line and low-voltage terminal boards.
c. Check the supply and return piping. They must
be properly connected to the inlet and outlet
connections on the unit.
d. If the checks described above fail to reveal the
problem and the unit still will not operate, contact
a trained service technician to ensure proper
diagnosis and repair of the equipment.
Note: Units have a five minute time delay in the control
circuit that can be eliminated on the CXM2 PCB as
shown in Figure 5. See controls description for detailed
features of the control.
⚠ WARNING! ⚠
WARNING! Verify ALL water controls are open and allow
water flow prior to engaging the compressor. Freezing of the
coax or water lines can permanently damage the heat pump.
Table 6: Water Temperature Change Through Source
Heat Exchanger
Water Flow, gpm [l/m]
Rise, Cooling
°F, [°C]
Drop, Heating
°F, [°C]
For Closed Loop: Ground Source or
Closed Loop Systems at 3 gpm per
ton [3.9 l/m per kW]
9 - 12
[5 - 6.7]
4-8
[2.2 - 4.4]
For Open Loop: Ground Water
Systems at 1.5 gpm per ton
[2.0 l/m per kW]
20 - 26
[11.1 - 14.4]
10 - 17
[5.6 - 9.4]
Table 7: Coax Water Pressure Drop JMW170/340
Pressure Drop PSI (FT)
Model GPM
30°F
50°F
70°F
90°F
Source/Outdoor Coax
340
35
53
70
1.6 (3.7)
4.0 (9.3)
7.2 (16.6)
1.2 (2.7)
3.6 (8.3)
6.5 (15.0)
1.0 (2.3)
3.3 (7.6)
5.9 (13.6)
0.9 (2.0)
3.0 (7.0)
5.5 (12.6)
170
18
27
35
0.8 (1.9)
2.7 (6.3)
4.8 (11.2)
0.4 (1.0)
1.7 (3.9)
3.3 (7.6)
0.2 (0.4)
1.5 (3.4)
3.0 (6.9)
0.1 (0.3)
1.4 (3.1)
2.8 (6.4)
Model
l/s
Pressure Drop kPa
0°C
10°C
20°C
30°C
Source/Outdoor Coax
340
2.21
3.34
4.42
11.03
26.88
48.95
8.27
24.82
44.82
7.22
23.10
41.36
6.29
21.29
38.47
170
1.1
1.67
2.21
4.82
17.92
32.40
2.76
11.72
22.75
1.72
11.38
21.37
.88
9.47
19.30
Table 8: Coax Water Pressure Drop JMW036-120
Model
GPM
Pressure Drop PSI
30°F
50°F
70°F
90°F
Source/Outdoor Coax
036
4.5
6.8
9.0
1.7
4.1
7.1
1.3
3.4
6.0
1.0
2.8
5.1
0.8
2.4
4.5
060
7.5
11.3
15.0
1.5
4.0
6.9
1.3
3.4
6.2
1.1
3.0
5.5
0.9
2.7
5.0
120
15.0
22.5
30.0
1.7
4.4
7.6
1.4
3.8
6.8
1.2
3.3
6.1
0.9
2.7
5.0
Load/Outdoor Coax
036
4.5
6.8
9.0
0.6
1.4
2.6
0.5
1.3
2.4
0.3
1.1
2.2
060
7.5
11.3
15.0
1.4
3.5
6.2
1.3
3.2
5.8
1.2
3.0
5.5
120
15.0
22.5
30.0
1.6
3.8
6.8
1.4
3.5
6.4
1.3
3.3
6.0
Must use antifreeze if operation falls in grey area
Operation not recommded
Multiply PSI x 2.31 to determine ft of hd
Installation, Operation, Maintenance
27
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Operating Pressures
JMW036-340 (JMW120, 340 Per Circuit)
Source
Source
Load EWT
Entering
Water
Suction Discharge
Water
Flow GPM/ F @ 1.5- Pressure Pressure
3.0
GPM/
Temp ºF
ton
PSIG
PSIG
Ton
50
1.5
50
2.3
3.0
1.5
80
2.3
3.0
1.5
110
2.3
3.0
28
99-106
230-234
60
111-122
70
122-137
80
Cooling
Water
Water
Super-heat Sub-cooling Temp Rise Temp Drop
ºF Source
ºF Load
11-18
18-25
7-15
241-243
11-18
18-25
251-253
17-25
18-25
126-145
254-258
26-35
18-25
9-20
50
98-105
212-214
18-23
14-20
7-15
60
106-117
218-220
18-23
14-20
70
114-129
225-227
24-32
14-20
80
117-135
228-230
32-41
14-20
9-20
50
87-101
199-203
12-18
12-18
8-16
60
91-113
203-207
12-18
12-18
70
95-124
204-216
16-34
12-18
80
107-128
212-217
33-35
12-18
9-20
50
104-111
343-348
9-14
18-25
7-14
60
121-132
355-360
9-14
18-25
70
138-152
367-373
9-14
18-25
80
148-161
377-381
12-23
18-25
9-20
50
103-111
320-325
8-14
14-21
7-14
60
118.-129
328-334
8-14
14-21
70
132-147
336-344
12-20
14-21
80
140-172
343-353
19-29
14-21
9-20
50
94-110
305-314
9-13
12-18
7-15
60
112-121
313-319
9-13
12-18
70
121-146
317-329
12-20
12-18
80
131-151
324-333
18-27
12-18
50
109-116
483-497
9-13
17-23
60
128-135
494-511
9-13
17-23
70
147-154
505-525
9-13
17-23
7-15
50
109-116
459-473
9-13
15-20
5-11
60
127-135
466-484
9-13
15-20
70
153-159
473-495
9-13
15-20
7-15
50
100-112
444-431
9-14
12-17
5-12
60
120-130
449-467
9-14
12-17
70
131-152
454-474
9-14
12-17
80
153-164
463-479
13-21
12-17
20-28
13-18
9-12
19-28
13-18
8-12
8-17
8-19
8-17
9-19
8-17
9-19
7-16
8-18
8-16
8-18
8-16
9-18
9-20
5-11
18-26
14-17
8-13
Installation, Operation, Maintenance
6-13
6-13
6-14
7-15
8-17
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Operating Pressures, Cont’d.
JMW036-340 (JMW120, 340 Per Circuit)
Source
Source
Load EWT
Entering
Water
Suction Discharge
Water
Flow GPM/ F @ 1.5- Pressure Pressure
3.0
GPM/
Temp ºF
ton
PSIG
PSIG
Ton
20
3.0
1.5
50
2.3
3.0
1.5
80
2.3
3.0
Heating
Super-heat Sub-cooling
Water
Temp
Drop ºF
Source
Water
Temp Rise
ºF Load
60
56-63
199-228
4-14
6-14
5-14
80
58-65
286-297
4-14
6-14
90
59-66
310-344
4-14
6-14
100
61-65
360-385
4-14
6-14
4-14
120
64-69
459-510
4-14
6-14
4-13
60
85-95
212-224
6-11
7-11
6-17
80
91-99
290-310
6-11
7-11
90
92-101
326-338
6-11
7-11
100
96-103
381-399
6-11
7-11
5-17
120
100-108
474-488
6-11
7-11
4-16
60
95-102
215-228
6-13
7-11
7-18
80
98-106
299-313
6-13
7-11
6-18
5-14
2-6
4-14
6-17
9-16
6-12
6-17
90
99-108
329-341
6-13
7-11
100
102-110
384-401
6-13
7-11
6-18
6-17
120
106-114
475-491
6-13
7-11
5-17
60
95-107
215-256
6-14
7-15
7-19
80
101-110
310-326
6-14
7-15
90
103-112
329-376
6-14
7-15
100
105-114
399-414
6-14
7-15
6-18
120
108-118
476-524
6-14
7-15
5-17
60
109-129
225-237
14-26
5-14
8-18
80
123-138
314-327
14-26
5-14
90
130-142
343-357
10-15
5-14
100
137-147
402-415
10-15
5-14
7-19
120
150-157
493-504
10-15
5-14
6-20
60
111-132
227-239
14-38
6-15
8-20
80
135-147
315-330
14-38
6-15
90
143-152
344-360
10-16
6-15
100
145-154
405-418
10-16
6-15
7-20
120
156-163
494-507
10-16
6-15
6-20
60
110-149
227-279
19-44
6-18
9-21
80
135-150
286-332
19-44
6-18
90
145-166
345-408
13-23
6-18
100
148-158
405-420
13-23
6-18
7-19
5-9
6-19
8-19
15-21
7-19
8-20
10-15
7-12
Installation, Operation, Maintenance
8-20
8-21
8-21
8-21
29
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Preventive Maintenance
Heat Exchanger Maintenance (Direct Ground Water Applications Only)
If the installation is performed in an area with a known
high mineral content (125 P.P.M. or greater) in the
water, it is best to establish with the owner a periodic
maintenance schedule 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 either the heat exchanger material or copper water
lines. Generally, the more water flowing through the unit
the less chance for scaling therefore 2.5 gpm per ton [2.0
l/m per kW] is recommended as a minimum flow.
Heat Exchanger Maintenance (All Other Water Loop Applications)
Generally water coil maintenance is not needed however,
if the installation is located in a system with a known
high dirt or debris content, it is best to establish with
the owner a periodic maintenance schedule so the coil
can be checked regularly. These dirty installations are
a result of the deterioration of iron or galvanized piping
or components in the system or open cooling towers
requiring heavy chemical treatment and mineral buildup
through water use. 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.
Clean or replace 20 mesh (841 micron) [0.84mm]
strainer/filters on a timely schedule.
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. Generally vertical cabinets are set up
from the floor a few inches for prevention. 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 chart for
pressure and temperatures. Verify that air and water
flow rates are at proper levels before servicing the
refrigerant circuit.
If the refrigerant circuit is opened for any reason, a new
liquid line filter-drier must be installed.
Compressors - Conduct annual amperage checks to
ensure amp draw is no more than 10% greater than that
indicated by serial plate data.
30
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
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
Antifreeze: _____%
Type of Antifreeze: __________________
Cooling Mode
Heating Mode
Source
Entering Fluid Temperature
Leaving Fluid Temperature
Temperature Differential
Pressure In
Pressure Out
Pressure Differential
Entering Fluid Temperature
Load
Leaving Fluid Temperature
Temperature Differential
Pressure In
Pressure Out
Compressor
Pressure Differential
Amps
Volts
Discharge Line Temperature
(6” from Compressor Outlet)
Allow unit to run 15 minutes in each mode before taking data.
Do not connect gauge lines
Installation, Operation, Maintenance
31
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Refrigeration Troubleshooting Form
Refrigeration Troubleshooting Form
Water-to-Water Units
Customer:
Loop Type:
Model #:
Serial #:
Startup Date:
Antifreeze Type & %:
Complaint:
REFRIGERANT: HFC-410A
OPERATING MODE:
HEATING POSITION
HEATING
REFRIG FLOW - HEATING
COOLING
REFRIG FLOW - COOLING
REVERSING
VALVE
11 13
10 12
2
1
SUCTION
CONDENSER (COOLING)
EVAPORATOR (HEATING)
COAX
Load
COOLING POSITION
COMPRESSOR
EXPANSION
VALVE
CONDENSER (HT G)
EVAPORAT OR (CLG)
3
COAX
FILTER
DRIER
DISCHARGE
4
HWG**
Source
5 LT2:
**Turn off HWG before
troubleshooting.
Description
Voltage
Compressor Amps
1 Suction Temp
2 Suction Press
2a Saturation Temp
2b Superheat
3 Discharge Temp
4 Discharge Press
4a Saturation Temp
4b Subcooling
5 Liquid Line Temp
5 LT1:
HEATING
LIQUID
LINE
COOLING
LIQUID
LINE
Heating
6
7
8
9
Cooling
6 Source Water In Tmp
7 Source Water Out Tmp
8 Source Water In Pres
9 Source Water Out Pres
9a Press Drop
9b Flow Rate GPM [l/s]
10 Load Water In Temp
11 Load Water Out Temp
12 Load Water In Pres
13 Load Water Out Pres
13a Press Drop
13b Flow Rate GPM [l/s]
Temp Diff. =
Temp Diff. =
Heat of Extraction (Absorption) or Heat of Rejection:
HE or HR =
Flow Rate x
32
Notes
Temp. Diff x
Fluid Factor: (for Btuh)
Fluid Factor: (for kW)
500 (Water); 485 (Antifreeze)
4.18 (Water); 4.05 (Antifreeze)
Fluid Factor
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Notes
Installation, Operation, Maintenance
33
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Notes
34
Installation, Operation, Maintenance
THE SMART SOLUTION FOR ENERGY EFFICIENCY
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Notes
Installation, Operation, Maintenance
35
WAT E R - S O U R C E H E AT P U M P S
JMW-Series
R ev. : Fe b r u a r y 2 8 , 2 0 2 3
Revision History
Date:
Item:
Action:
02/28/23
All
Transitioned from CXM to CXM2 and DXM2 to DXM2.5 unit
controls
12/08/21
All
Removed LON Controls, Updated Water Quality Standards
05/10/21
All
Changed “Slave” to “Subordinate”
03/10/21
Electrical Table (pg. 16)
Added SCCR values
08/19/20
Created
14806-NOM1-0223
97B0059N07
Johnson Controls 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 Johnson Controls’ Customer Service Department at 1-877-329-7430
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 Johnson Controls’ opinion or commendation of its products.
© 2020 Johnson Controls | 100 JCI Way, York, Pennsylvania USA 17406-8469 | www.johnsoncontrols.com
Subject to change without notice. | Form 14806-NOM1-0223 | Supersedes: 14806-NOM1-1221 | All rights reserved.
36
Installation, Operation, Maintenance