The option-rich, water-to-air
LV offers one of the smallest
cabinets in the industry,
making it a great choice for
replacement and new
construction projects.
Tabulated performance data is at noted water temperatures and entering air conditions of 80.6°F DB/66.2°F WB at AHRI/ANSI 13256-1 rated CFM with 1"
disposable fi lter.
GLHP ratings require an extended range option. ECM motors can be either constant torque or constant CFM.
Fluid Flow
Rate
Cooling
Capacity
(WLHP)
86˚F68˚F77˚F32˚F
Water LoopGround Loop
Capacity and Effi ciency Data – PSC Motor (Standard)
EER
(WLHP)
Heating
Capacity
(WLHP)
ECM Motor (Option)
(WLHP)
COP
Cooling
Capacity
(GLHP)
EER
(GLHP)
ubject to change without prior notice
Heating
Capacity
(GLHP)
COP
(GLHP)
Page 4
3 | LV Model | Commercial Geothermal Heat Pumps
FHP Equipment
Specializing in effi cient green technology for commer-
cial heating and cooling products. FHP products are
one of the leading Geothermal and Water Source heat
pumps in the market, which assures that you are buying
a unit that you can trust. Bosch Thermotechnology
Corp. is dedicated to providing highly effi cient heating
and cooling solutions to the private and public sectors.
Bosch Thermotechnology Corp. is always on the
forefront of product development and innovative
design to optimize the performance of FHP units.
Our products are designed and manufactured to the
highest quality, refl ecting the no-compromise stan-
dards for which FHP and Bosch are renowned in order
to provide our customers with the highest level of
satisfaction and comfort. The variety of options,
energy effi ciency, and uncompromising quality of all
FHP products makes them the ideal choice for the
commercial new construction market and the ease of
designing into tight retrofi t spaces of buildings.
Advantages of FHP Technology
Low installation costs
Lower operating costs
Flexibility and comfort
Energy effi ciency
Space savings
Superior quality
Quiet operation
LV Model 007 - 070
13 Models from 1/2 through 6 tons
Horizontal, Vertical, and Counterfl ow Confi gurations*
The LV Model is a cost-effective, single stage water
source heat pump designed for commercial retrofi t
and new construction applications.
*Not all model sizes are available in all confi gurations. Consult the charts
found in this catalog for details.
Features, Functions and Benefits
Cabinet
The LV unit cabinetry is constructed using heavy-gauge,
galvanized steel. This steel provides superior corrosion
protection for units located indoors.
All interior surfaces are lined with 1/2" thick, 1.5 lb./
cu.ft. density, Micromat insulation for thermal insulation and acoustical attenuation. This insulation is
non-combustible, non-hydroscopic and does not
support fungal growth. Insulation meets NFPA 90A and
90B for fi re protection and is certifi ed to meet the
GREENGUARD® Indoor Air Quality Standard for Low
Emitting Products.
Protection against corrosion is a feature in the LV unit.
A stainless steel drain pan will last the lifetime of the
unit and resist corrosion and cracking that may occur
with steel or plastic materials.
Subject to change without prior notice.
Page 5
boschheatingandcooling.com | 4
MERV-8 or MERV-13
Filter Option
2" 4-Sided Filter
Rack Option
Quiet Operation
Noise reduction is a critical consideration of the
unit design. All LV units have a distinct fl oating base
pan; the compressor is mounted on a heavy steel
plate which rests on a high density rubber pad on
the base of the unit. In addition, compressors are
mounted on rubber grommets. This double isolation, distinct to FHP equipment, is standard in all
LV units preventing vibration and noise transmission
from the compressor to the unit structure, resulting
in exceptionally quiet operation.
The LV offers optional 1/2" thick, closed cell foam
insulation to help aid indoor air quality (IAQ) and to
further attenuate low frequency noise from the
compressor compartment. The closed cell foam
insulation option is available in all unit sizes. For
additional sound attenuation, an optional compressor
blanket is available on unit sizes 024 and above.
Serviceability
All units are designed to be serviced from the front of
the unit. Schrader valves for high and low pressure
gauges and the electrical box components are easily
accessible for diagnosing and servicing the unit.
Insulated bulkheads in all units, separate the compressor section from the blower section, allowing the
unit to be serviced during operation.
Schrader
Charging Valves
Closed Cell Foam
Insulation (Optional)
Unit Confi gurations
All units are available in horizontal, vertical and
counterfl ow confi gurations. Additionally, several
options of return air and supply air are offered as
standard, providing confi guration fl exibility.
Filter Racks and Options
Units come standard with a 1" fi lter rack and construc-
tion fi lter. A 2" four-sided fi lter rack and pleated fi lter is
optional and greatly improves air fi ltration. Filter doors
allow for easy routine maintenance and changing of the
air fi lter. A 1" return duct collar is integral to the fi lter
rack eliminating the need for fi eld mounted duct collars.
MERV-8 and MERV-13 Filters
The optional MERV-8 or -13 fi lter is most advantageous
for premium air fi ltration on commercial HVAC
projects. High effi ciency fi ltration is a cost-effective
way of upgrading air quality while maintaining low
pressure drop and sustaining long service life. These
fi lters effectively remove up to 98% of airborne
matter, such as fi ne particulates, bacteria, smoke,
gases and allergens including dust mites, pollen, mold
spores, dust and smog. MERV-8 and MERV-13 rated
fi lters are a minimum requirement for EQ credits 3.1
and 5 on LEED projects. With the standard ECM
constant airfl ow motor the LV is prepared to handle
higher external pressure drops when utilizing the
higher effi ciency MERV-13 fi lters.
Large removable panels aid in servicing the unit, when
necessary. Separate electrical knockouts in the unit
corner post allow for easy and safe routing of high and
low voltage lines to the inside of the cabinet.
Standard
Optional
Subject to change without prior notice.
Page 6
5 | LV Model | Commercial Geothermal Heat Pumps
.
Constant Airfl ow
ECM Option
Constant Torque
ECM Option
Fan Motor
Permanent Split Capacitor Motors (PSC)
The standard motor for all LV model heat pumps is a
PSC motor. For all models other than 575 V units, the
supplied motor is a three speed motor. 575 V motors
are single speed.
ECM Constant Torque Motor (Optional)
The LV’s constant torque blower motor option offers
improved effi ciency (up to 33%) over the standard
PSC motor. This motor is similar in function to a PSC,
but can handle up to 1 in.w.g. external static pressure
making it a wise choice for high fi ltration applications.
These motors are available in unit sizes 015 to 070.
This ECM motor option is an excellent choice for
retrofi t. The constant-torque motors do not require a
neutral wire for 460/3 power.
ECM Constant Airfl ow Motor
The LV’s new high effi ciency ECM motor option,
available in 1/3hp to 1hp, provides constant airfl ow in
a wide static pressure range up to 1 in.w.g. Available in
unit sizes 015 to 070, this motor is a great choice in
high fi ltration applications, such as MERV-13. The
motor has a soft start/stop feature, keeping noise to a
minimum. LV units outfi tted with any ECM motor can
see an effi ciency boost with up to 1.8 additional points
of EER.
Passive dehumidifi cation can be achieved with the
constant airfl ow ECM by reducing nominal airfl ow by
15%. This control feature lowers air coil temperature and
prevents over-cooling of the space when in dehumidifi -
cation mode. IMPORTANT NOTE: The constant airfl ow
ECM requires a neutral wire in a 460V application.
2-Way Valve with
Actuator
Coax Coil
Hanging Brackets
All horizontal units come standard with hanging
bracket kits for suspending the unit from fi eld
supplied hanger rods. These kits include heavy-duty
steel brackets and rubber grommets for sound and
vibration isolation from the building structure.
Water Connections
All water connections are heavy-duty bronze FPT
fi ttings securely fastened to the unit corner post.
This allows connecting to a fl exible hose kit without
the use of a backup wrench making for easier,
faster installation.
Two-Position Water Valve
The two-position motorized water valve is optional
on all unit sizes and is a great energy savings
option. The valve opens to allow 100% fl uid fl ow
through the coaxial heat exchanger only when
there is a call for cooling or heating. Closing off
fl uid fl ow to the unit when there is no call for
cooling or heating reduces system operating costs,
when using variable speed pumping, by reducing
the speed of the primary loop pumps.
Refrigerant Circuit
LV units are designed using the optimum
combination of compressor, water and air coils to
provide peak performance. LV units are rated to
withstand 600 PSIG working refrigerant pressure
and 400 PSIG working water pressure.
Heavy-duty heat pump compressors are used in all
units. Rotary, reciprocating and scroll compressors
offer optimum performance for each unit size.
Subject to change without prior notice
Page 7
boschheatingandcooling.com | 6
.
CompressorsTin Plated with Coated Fin
Evaporator Coil (Optional)
Refrigerant to water heat exchangers are coaxial tube-intube type providing a robust construction, ensuring years
of trouble free operation. Coaxial coils are selected and
designed for peak performance, offering the best combination of low water pressure drop and maximum heat
transfer in both the cooling and heating modes. Standard
coaxial coils have a copper interior water tube and a steel
outer shell. Optional Cupro-Nickel coils are available for
applications where the water is of lower quality.
In geothermal applications where fl uid temperatures
can drop below the dew point of the surrounding air,
optional insulation is available to prevent water coils
and refrigerant piping from sweating.
Air side refrigerant coils have copper tubes, aluminum
fi ns and side plates to prevent corrosion.
Air coils are state of the art, employing lanced fi n and
rifl ed tubing for maximum heat transfer. Large face
areas result in lower face velocity reducing sound
while ensuring high latent heat removal for maximum
dehumidifi cation in the cooling mode.
A pilot operated four-way reversing valve in the refrigeration circuit allows the unit to operate in either the
heating or cooling mode. All FHP units have the
reversing valve energized in cooling mode. This will
ensure you are not left without heat in the middle of
winter, should the reversing valve coil fail.
Refrigerant fl ow to the air coil is metered by capillary
tubes as standard in LV units. Thermal Expansion
Valves come with the optional Extended Range LV and
are designed to vary the fl ow of refrigerant depending on
the load. TXV’s provide unit optimization and a more
stable control over a wider range of operating conditions.
Blower Housing
(with Removable Inlet Ring)
Evaporator Coil and DuoGuardTM (Option)
Air handling sections come standard with a copper
tube aluminum fi n evaporator coil. Available as an
option is the DuoGuardTM evaporator coil protection
system. DuoGuardTM Protection® - Tin Electro-Plated
Copper Tubing with High-Tech Polymer Coated
Aluminum Fins will aid in protecting the evaporator
coil from most forms of corrosive elements in the
airstream. The tin plating provides a best-in-class
protection of the copper tubing from formicary
corrosion while the fi n coating provides protection
against salt spray and other corrosive elements.
DuoGuardTM protected coils are able to exceed 1000
hours salt spray per ASTM standard B-117.
Blower Housing
A removable inlet ring is a standard feature of the
blower housing on all unit sizes. The removable inlet
ring helps facilitate motor removal without having to
remove the fan housing from the cabinet.
Unit Protection Module
Each LV Model is factory provided with a Unit
Protection Module (UPM) that controls the unit
operation and monitors the safety controls that protect
the unit. The UPM interfaces with the thermostat or
direct digital controller. The main purpose of the UPM
is to protect the compressors by monitoring the
different states of switches and sensors. This module
provides time delays and protects the unit against
freezing of the water to refrigerant and air to refrigerant
heat exchangers as well as condensate overfl ow.
ubject to change without prior notice
Page 8
7 | LV Model | Commercial Geothermal Heat Pumps
.
TXV Valve (Optional)
Safety controls include the following as standard:
High pressure switch located in the refrigerant
discharge line.
Low pressure switch located in the unit refrigerant
suction line.
Standard low fl uid temperature (freeze) protection
sensor. The freeze protection sensor, located on the
refrigerant liquid line entering the coaxial heat
exchanger, is designed to disable compressor
operation when the unit is in the heating mode,
should the refrigerant temperature fall below either
26°F (-6.6°C) or 15°F (-9.4°C).
Condensate overfl ow protection sensor is standard
and factory mounted in the drain pan of the unit.
Low air coil temperature (freeze) protection sensor
disables the compressor when the refrigerant
entering the air coil drops below 30°F (-1.1°C).
UPM Control Board Features
Condensate Overfl ow Protection — The UPM
controller continuously monitors the drain pan for
high condensate water level, and if this exceeds
normal operating levels, the compressor operation
is interrupted to protect against drain pan overfl ow.
Anti-Short Cycle Timer — 5 minute delay on break
timer to prevent compressor short cycling.
UPM Control Board
Low Pressure Bypass Timer — The low pressure
switch is bypassed for 120 seconds after a call for
compressor operation to prevent nuisance low
pressure lockouts during cold start-up in the
heating mode.
Brownout/Surge/Power Interruption Protection
— Prevents compressor operation should the voltage
drop below 10% of unit rated value. The unit will
restart once the voltage is within tolerance and the
random start has timed out.
Malfunction (Alarm) Output — The controller has a
set of contacts for remote fault indication. This can
be either a steady output or can be set to pulse with
the fault code. Two connections are available - one
to provide a 24 volt output, the other to provide a
dry contact.
Test Service Mode — A dip switch setting is provid-
ed to reduce all time delay settings to 10 seconds
maximum during troubleshooting for verifi cation of
unit operation.
LED Fault Indication — Two LED indicators are
provided as follows:
Green: Power LED indicates 18 – 30 VAC present
at the board.
Red: Fault indicator with blink codes identifying
the particular fault. This information is available
via the malfunction (alarm) output contacts.
Random Start — Each controller has a unique
random start delay ranging from 270 to 300 seconds
after power is applied to the board. This will prevent
the simultaneous start of multiple units after a
power outage.
Subject to change without prior notice
1 Blink - High Pressure
2 Blinks - Low Pressure
3 Blinks - Low Fluid Temperature (Freeze Protection)
4 Blinks - Condensate Overfl ow
5 Blinks - Brownout condition
Page 9
boschheatingandcooling.com | 8
.
Intelligent Reset—If a fault condition is initiated, the
5 minute delay on break time period is initiated and
the unit will restart after this delay expires. The UPM
is confi gurable for either 2 or 4 fault occurrences
before going into a hard lockout. The selection is
made through a dip switch setting on the board. If
the fault condition still exists or reoccurs twice or
four times within one hour, the unit will go into a
hard lockout and requires a manual lockout reset. A
condensate overfl ow fault will, however, put the unit
into a hard lockout immediately.
Lockout Reset—A hard lockout can be reset by
turning the unit thermostat off and then back on or
by shutting off unit power at the circuit breaker. The
method of reset is selectable by the dip switch on
the board.
Additional Options
Blower monitor relay
Typical unit control is by a wall mounted thermostat that
senses temperature in the occupied space. By utilizing a
humidistat in addition to the thermostat, LV units with
Hot Gas Reheat are able to control the humidity levels in
the space as well. The Hot Gas Reheat option allows
cooling and dehumidifi cation to satisfy both the thermo-
stat and humidistat while preventing over-cooling of the
space while in the dehumidifi cation mode.
Once the thermostat reaches set point temperature, the
humidity is above set point, the unit controller will
energize the reheat valve operating the unit in hot gas
reheat mode, fi rst cooling and dehumidifying, then
reheating the air (using hot refrigerant gas) before delivering it to the space, usually 2° to 5°F below room temperature. The unit operates like a dehumidifi er by reheating
the air along a constant sensible heat line, while the
relative humidity of the leaving air is reduced.This option
offers signifi cant energy savings over reheating air with
electric heating coils.
Compressor monitor relay
Phase monitor
Pump relay
Fire alarm relay
Fault LED light
50, 75 or 100 VA transformer option
40 Amp disconnect switch
Single and three phase
Hot Gas Reheat
Hot gas reheat (HGR) allows the user to not only control
space temperature, but also humidity levels within the
conditioned space. Excessive moisture in the space can
promote mold growth leading to damage in the structure
or interior surfaces, as well as reducing the air quality
and creating an unhealthy environment.
Possible causes of excess humidity could be a byproduct
of the unit having to operate under a widely varying load,
an oversized short cycling unit, a high percentage of
unconditioned outside air being introduced into the
space, a high latent load in the space or any location
where humidity infi ltration is a problem.
The moisture removal capacity of a specifi c heat pump
is determined by the unit latent capacity rating. A heat
pump’s latent capacity can be determined by reviewing the heat pump specifi cation data sheets. Depend-
ing upon the entering water and air conditions, a total
and sensible capacity can be interpolated from the
data sheets. Subtracting sensible capacity from total
capacity yields latent capacity. Dividing the latent
capacity by 1069 converts the amount of moisture
removal from BTU/Hr. to Pounds Per/Hr.
A hot gas reheat valve and a reheat coil are included in
the refrigerant circuit. The refrigerant circuit in the
cooling and heating mode is identical to a standard
heat pump.
In the reheat mode, the compressor discharge gas is
diverted through the reheat valve to the reheat coil
which is located downstream of the cooling coil.
The superheated refrigerant gas reheats the air
leaving the cooling coil. The hot refrigerant gas then
passes though the water to refrigerant coil where it
is condensed to a liquid. From this point the rest of
the cooling cycle is completed as in a regular heat
pump. There are check valves to prevent refrigerant
fl ow into the reheat coil during standard cooling/
heating cycles.
ubject to change without prior notice
Page 10
9 | LV Model | Commercial Geothermal Heat Pumps
.
Hot Gas Reheat Control Options
There are several ways to control heat pumps with hot
gas reheat. You should choose the means that best
suits your specifi c application. Please refer to the Hot
Gas Reheat wiring diagrams for typical thermostat
wiring. Most heat pump compatible thermostats in
conjunction with a humidistat are acceptable for use,
(Note: “O” output for reversing valve energized in
cooling mode is required.) Combination thermostat/
humidistats are also available.
Special Considerations
Some applications require special attention to
maximize the performance of the hot gas
reheat function:
Low Temperature Well Water
Indoor Pool Dehumidifying During Winter Months
(Re: Heating Mode)
Consult the factory for special application considerations.
the pool water temperature. If this is not done the
warm pool water attempts to heat the space and the
humidity levels increase exponentially. The heat pump
is normally sized to handle the design latent load
moisture removal. A second heat pump or resistance
heat should be provided to handle the structure’s shell
loss load. DuoGuard™ evaporator coil option is required for this application.
Protective coatings are highly recommended for
all pool applications, due to the highly corrosive
chemical environment.
Sequence of Operation - Modulating Hot
Gas Reheat (MHGRH)
Modulating Hot Gas Reheat differs from On/Off in that
the reheat function is always active. The purpose of
Modulating Hot Gas Reheat is to deliver supply air at or
close to neutral conditions.
Low Temperature Well Water
When low temperature well water is utilized as the water
source (below 55°F), a means of establishing two fl ow
rates, one for the cooling/reheat mode and one for
heating mode is recommended. In the cooling mode at
low entering water temperatures and standard fl ow
rates, discharge pressures and corresponding discharge
gas temperatures are relatively low. At these conditions,
when the reheat mode is initiated, the low temperature
discharge gas can reduce reheat capacity. A means to
reduce the water fl ow rate and elevate the discharge
pressure/temperature in cooling/reheat mode should be
provided. Conversely, at low entering water temperatures in the heating mode, system suction pressure is
reduced causing a loss in heating capacity. A means of
providing higher fl ow in the heating mode should be
supplied. The simplest way to accomplish the above is to
install water regulating valves.
Indoor Pool Dehumidifying
During Winter Months
It is important to remember that when in the reheat/
dehumidifi cation mode the heat pump is cooling and
reheating. A secondary means of heating the space during the dehumidifi cation mode should be provided. For
indoor pool environments, the indoor space temperature should be kept at least two (2) degrees F above
Subject to change without prior notice
Air is cooled and dehumidifi ed by the cooling coil to
around 55°F DB/54°F WB. A sensor located in the supply
air stream is set at the required leaving dry bulb temperature and will send a signal to the modulating hot gas
reheat valve to direct the fl ow of hot gas to maintain that
temperature. A typical application for this would be in
treating 100% outside air. This air would be ducted
directly into the space relieving the unit handling the
zone of any outside air load. This can result in a smaller
zone unit, less airfl ow and a savings in both initial and
operating cost.
Control of the hot gas modulation is by the thermostat
in the supply air duct or through a building management system. A separate controller is used to control
the unit itself.
Hot Gas Bypass
The function of the hot gas bypass valve is to prevent
icing of the air coil when the unit is operating at low
cooling load conditions. This situation could arise if the
space experiences widely different loads, for example a
conference center or if a unit is sized for
be oversized for cooling. Without a hot gas bypass
circuit the evaporating temperature could fall and ice
could form on the coil restricting airfl ow and aggravating
the situation. Eventually the heat pump could lock out
on air coil freeze protection.
heating, it could
Page 11
boschheatingandcooling.com | 10
.
The hot gas bypass valve located in the compressor
discharge line diverts hot gas to the inlet of the air coil.
The valve is factory set to open when the evaporating
pressure falls to 90 PSI and will modulate to prevent the
pressure falling any lower. This setting is fi eld adjustable
and this set point may be adjusted as required.
Psychrometric Chart
8
5
8
0
8
7
5
7
0
6
5
6
0
%
0
9
%
0
8
Lvg. CoilReheat
5
5
5
0
556065707580859095100
.com
%
0
7
%
55
0
6
%
0
5
%
0
4
%
0
3
%
20
R
%
10
MI
U
H
E
V
I
T
A
L
E
6
0
Y
T
I
D
DRY BULB TEMPERATURE - °F
7
0
6
5
0
7
5
%
5
2
%
5
1
H
E
V
I
T
LA
E
R
%
8
%
6
%
4
%
2
Figure 1
M
U
Entering
Y
T
I
D
I
85
8
5
W
E
T
B
U
L
B
T
80
E
M
P
E
R
A
T
U
R
E
75
70
65
DEW POINT TEMPERATURE - °F
60
55
50
45
40
35
30
25
20
10
0
Night setback status
Percent of units cooling
Percent of units heating
Cooling set point
Heating set point
Status of all the alarms
Space temperature
Occupied heating and cooling set points
Continuous or cycle fan during occupied mode
Command for occupied or unoccupied mode
Command for override of the unoccupied mode
(unit resorts to occupied set points)
-
°
F
Set point adjustment
DDC Room Sensors
To complement the controller, Bosch offers a line of
intelligent space sensors, which provide precision
measurement and communication capabilities in an
attractive low profi le enclosure. A hidden
communications jack provides access to the HVAC
control system for commissioning and maintenance.
Models available include:
The RS Pro has a large LCD display and easy-to-
use occupant controls for set point adjustment.
DDC Controls
The optional factory mounted DDC Controller is
preprogrammed and installed on the unit with the Unit
Protection Module (UPM) to be job site ready. The unit
will operate in a 100% stand-alone control mode or
connect to a Building Automation System (BAS) using
open protocols BACnetTM, Modbus, N2 or LonWorks®
(with an optional Lon card). Stand-alone DDC modules
must use remote intelligent sensors and are to be
programmed by the BACview® controller only.
Zone temperatures, leaving air temperatures and
water temperatures can be monitored from the central
control computer and unit fault indication displayed.
Available inputs/outputs include:
Discharge air temperature
Leaving water temperature
Fan run time
Override time remaining
The RS Plus offers a local set point adjustment
and override to an occupied mode and LED
indication of current status.
The RS Standard which has no local temperature
set point adjustment.
A BACview® hand held diagnostic tool is available to
allow local access to display and modify user
defi ned properties without any computer software.
These space sensors will monitor, sense and provide
local control for the room.
BACview® Hand Held
Diagnostic Tool
ubject to change without prior notice
Page 12
11 | LV Model | Commercial Geothermal Heat Pumps
.
DDC Control Board
DDC Zone Sensors*
RS Base
DDC Sensor
The Pro Zone Sensor (ZS) has an LCD screen that can
display the current temperature and set temperature.
It can also display relative humidity and CO2 settings as
well as their current readings. It comes with a button for
additional information that can be displayed.
The Pro ZS can be ordered in any of the
following combinations:
Temperature setting only
Temperature with relative humidity settings
Temperature, relative humidity, and CO2 settings
The Plus Zone Sensor (ZS) has a little different look to
it. It has a occupied indicator that identifi es the sensor
to be operating in occupied conditions. It comes with
a slide bar of for some manual temperature control in
the occupied mode +/- setting can be adjusted
during commissioning.
The Plus ZS can be ordered in any of the
following combinations:
Temperature setting only
RS Plus
DDC Sensor
RS Pro
DDC Sensor
Waterside Economizer
Common Waterside Economizer Applications
Commercial application where perimeter heating is
taking place while core cooling is required. Perimeter heat pumps operating in the heating mode
extract heat from the building loop, thus dropping
the building loop fl uid temperature. Internal core
cooling requirements are usually high even in the
winter months due to people, lighting, and equipment loads. The moderate temperature loop water
circulated through a core heat pump’s waterside
economizer coil can provide free-cooling without
the use of mechanical cooling (Compressors). Also,
in many areas code requires some type of economizer cycle. Waterside Economizers in lieu of air
side economizers are an inexpensive way to satisfy
code requirements in commercial applications.
Can also be sized up for preheating.
Tenant build out commercial applications where the
central chilled water fl uid loop serves as a individual
zoned heat pump condenser water. In this application low temperature fl uid is always available for
free-cooling.
The Base Zone Sensor (ZS) is limited to only sensing
capabilities without local controllability. This zone
sensor offers a basic look and blends into most decors.
The Base ZS can be ordered in any of the
following combinations:
Temperature sensor
Temperature and relative humidity sensor
* DDC Zone Sensors available through Applications Special
Handling Sheet. When the Zone Sensors (ZS) are available as
a standard option they will replace the Room Sensors (RS).
Subject to change without prior notice
Fluid Flow
Fluid fl ow through heat pumps equipped with wa-
terside economizer coils is directed by the use of a
single three-way motorized ball valve. Flow is either
through the waterside economizer coil and then
through the condenser or through the condenser
only. When applying these units to a variable speed
pumping system, a separate fi eld provided means
of positive fl ow shut-off is required. (Re: A positive
shut-off solenoid valve located down stream of the
heat pump. See fi gure 2 on next page).
Page 13
boschheatingandcooling.com | 12
.
Waterside
Economizer (Optional)
Aquastat
The aquastat controller is mounted to the heat pump
electrical control box. All electrical control wiring is
factory installed. The controller is supplied with an
external range adjustment and screwdriver slot.
Actual range is -30° to 100°F and requires fi eld setting.
The remote bulb stored inside the heat pump for
shipping requires fi eld mounting.
Recommended settings: 45° F Cool, 90° F Heat
Air Side Pressure Drop
The air side pressure drop shown on the waterside
economizer performance tables is considered as
additional heat pump external static pressure. Refer
to Bosch Select Tools selection software for blower
performance and to determine if the unit requires an
optional fan upgrade.*
*See fhp-mfg.com for BST Software.
Fluid Differential
Pressure Switch (Optional)
Fluid Differential Pressure Switch
The function of the differential pressure switch is to
prevent or stop compressor operation should the
water supply fail. This will prevent the unit from
locking out on a safety requiring a manual reset to
restart. This optional control is internally mounted
and factory installed.
The switch is piped between the water entering and
leaving connections. Should the pressure drop across
the water to refrigerant heat exchanger and fall below
set value, the switch will open de-energizing the
compressor. The blower operation will not be affected
by this option.
Energy Management Switch (EMS)
This switch allows you to connect to an energy management system that can turn the unit off and on.
Figure 2
Aquastat
N.O.
Fluid in
3-Way motorized ball valve
N.C.
MBV
N.O.
“Bulb Strapped to Fluid”
in Line (field installed)
Waterside
economizer coil
Fluid to refrigerant
heat exchanger
Positive shut-off solenoid
valve for variable speed
pumping system
(field installed)
ubject to change without prior notice
Page 14
13 | LV Model | Commercial Geothermal Heat Pumps
.
ThermostatsHose Kit
Accessories
Thermostats
The unit control may be as simple as a single stage
thermostat or the unit may have a DDC controller
integrated into the building management system.
Kit 1: Hoses only. 3/4" through 2" diameter hoses are
available with 24" and 36" hose lengths. 1/2" diameter hose kits are available only with 12" long hoses.
All external low voltage control wiring is made to the
thermostat terminal located in the unit electrical box.
Thermostats may be manual change over, auto change
over, programmable or non-programmable depending
on the requirements of the project. A full line of
thermostats are available as an accessory.
Hose Kits
Hose kits are recommended between the unit and
system loop piping. This will help eliminate the transmission of vibration and noise from the unit to the space.
Hoses are fi re rated fi ber reinforced EPDM Stainless
Steel braid hoses with swivel connections.
Maximum working pressure 400 PSI for sizes 1/2" – 1"
diameter and 300 PSI for sizes 1 1/4" – 2".
A variety of hose kits are available depending on the
job requirement.
Kit 2: Hose kit 1 with ball valves on the supply and
return hoses. Valves have P/T (pressure/temperature)
ports to facilitate pressure and temperature readings.
Kit 3: Hose kit 2 with an automatic fl ow control
valve. The design fl ow rate is preset at the factory
per the design conditions and will automatically
limit the fl ow to this value. This will greatly facilitate
balancing of the fl uid loop and ensuring each unit
gets the required fl ow.
Kit 4: Hose kit 3 with a Y-strainer and blow down
valve on the supply side. The fi lter screen is 20
mesh, 304 stainless steel to help prevent dirt and
debris from entering the water coil.
Kit 5: Hose kit 3 with a 24 v 2 position solenoid
valve. This could be used to shut off fl ow to the unit
when there is not a call for heating or cooling. A typical application would be with VFD pumping.
Kit 6: Hose kit 4 with a 24 v 2 position solenoid
valve. Hose kit options are available in the accessories section of the BST selection software.
Subject to change without prior notice
Page 15
.
Unit Confi guration Diagrams
Counterfl ow
Compressor Access
Condenser
Water Out
Condenser
Water In
Electrical
Knock-Outs
boschheatingandcooling.com | 14
Figure 3
Blower Access
Condensate
Drain
Left Hand Return Top Discharge FLTRight Hand Return Top Discharge FRT
Access
Panels
Condenser
Water Out
Condenser
Water In
Condensate
Electrical
Drain
Connections
Figure 4
Figure 5
Front
Straight Through FLS
Typical Horizontal Unit Confi gurations
Return Air RightReturn Air Left
Condensate
Drain
End Blow FLE
End Blow FRE
Front
Straight Through FRS
ubject to change without prior notice
Page 16
15 | LV Model | Commercial Geothermal Heat Pumps
.
Systems
LV Models may be used in a variety of different
applications depending on the system design. An
overview of tower/boiler and geothermal systems is
given below. There could be several variations and
combinations of these systems.
Cooling Tower/Boiler Systems
will keep the fl uid within certain temperature limits
typically 70°F in winter and 85°F in summer by cycling
either the cooling tower or boiler.
In today’s modern buildings the interior core usually
has a net cooling requirement year round irrespective
of the outside temperature. This is due to the internal
heat gains from people, offi ce equipment and lighting.
The heat from heat pumps operating in cooling is
rejected to the common water loop and is absorbed
by heat pumps on the building’s perimeter that are in
the heating mode. In effect the system is transferring
energy around the building areas from where it is in
excess to those areas where it is needed. In many
instances we fi nd a balanced system where the heat
generated in the interior space is suffi cient to heat the
perimeter, resulting in neither the cooling tower nor
boiler operating. This concept, unique to a water
source system, provides the most energy effi cient
system on the market.
Water source heat pumps with cooling tower/boiler
systems have been used for many years and are
recognized as having a low installation cost and
providing more energy effi cient operation than most
other systems on the market.
In a typical building, each offi ce or space would
receive its own heat pump. This ensures that the unit
will independently satisfy the heating or cooling
requirements for that space irrespective of the requirements of any other space. Unlike some other
systems, this offers individual control and enhanced
comfort in all areas.
All the units are connected to a common water loop
containing, in addition to the heat pumps, a cooling
tower, boiler, a primary and standby pump and a loop
water temperature controller. In the summer cooling
mode, the units are cooling and rejecting heat to the
water loop. This heat is then rejected to the atmosphere through a cooling tower. In winter, heat is
taken from the loop and, together with the compressor’s heat of compression, used to heat the space.
The heat removed from the loop is then replenished
by the boiler. The loop water temperature controller
Geothermal Systems
The earth has a tremendous capacity of storing thermal
energy, which can be utilized to heat or cool a building.
A geothermal system offers all the benefi ts of a
cooling tower and boiler system with the additional
advantage of having overall greater energy effi ciency.
As the cost of energy increases, geothermal installations are becoming the system of choice by developers and design engineers.
There are several alternative methods of utilizing the
energy contained in a geothermal system, giving the
design engineer several options for selecting the one
that is right for a particular application.
Earth Coupling Options
Ground Loop Systems (Closed Loop)
Lengths of high density polyethylene piping are buried
in the earth either in vertical bore holes or horizontal
trenches depending on the space available.
Subject to change without prior notice
Page 17
boschheatingandcooling.com | 16
.
Fluid from the loop inside the building circulates
through these pipes either rejecting heat to the
ground when there is a net cooling requirement or
absorbing heat from the ground when heating is the
dominant requirement.
The temperature of the earth below 6 feet is relatively
constant and is not affected by the ambient temperature. For this reason, the ground temperature is cooler
than the summer ambient and warmer than the winter
ambient in most regions. Geothermal systems are able
to operate effectively in extreme ambient conditions
exceeding 100°F in summer and -30°F in winter. This
is one of the reasons why geothermal systems have
such an advantage over other systems. An additional
advantage is that no fossil fuels are used, reducing the
carbon emission of the building.
Even in areas which are cooling or heating dominant a
hybrid system can be used with a downsized cooling
tower or boiler. This system will reduce the installed
cost signifi cantly with only a modest impact on overall
operating effi ciency.
This method is used mainly in commercial buildings or
where space for a loop fi eld is limited. Vertical holes
100 to 400 feet deep are drilled in the ground, and a
single loop of high density polyethylene pipe with a
U-tube at the bottom is installed. The bore hole is then
sealed with grout to ensure good contact for heat
transfer with the soil. The size of the project will
determine how many bore holes are required. The
vertical ground loops are then connected to a horizontal header pipe that carries fl uid to the building and
circulated to each heat pump. The Earth’s temperature is stable below the surface which is an advantage
for this system and provides for the greater effi ciency.
Vertical ground loop fi elds may be located under
buildings or parking lots. The life expectancy is in
excess of 50 years.
Horizontal Ground Loop System
Geothermal systems may cost more to install but the
savings in energy and low maintenance costs more
than off set this with payback times typically fi ve years
or even less.
Vertical Ground Loop System
This type is cost effective on smaller projects or where
there is suffi cient space for the loop fi eld. Trenches,
three to six feet deep are dug in which a series of high
density polyethylene pipes are laid. These loops are
manifolded and connected to the loop inside the
building which feeds the heat pumps. The fl uid is then
circulated, absorbing or rejecting heat to the earth
depending on the requirement for heating or cooling.
ubject to change without prior notice
Page 18
17 | LV Model | Commercial Geothermal Heat Pumps
.
Typical Heat Pump System
Surface Water, Lake or Pond System
This type of design is economical when a project is
located near a body of water. Fluid circulates through
polyethylene piping in a closed system, just as it does
through ground loops, but in this case, underwater. The
pipes may be coiled in a slinky to fi t more surface into a
given amount of space. The lake needs to be a minimum
size and depth depending on the building load. Lake
loops have no adverse impact on the aquatic system.
Specialized lake heat exchangers are also available for
this application. New technology is emerging for stainless steel and titanium heat exchangers.
Well Water System
is pumped directly from the source into the geothermal unit and then discharged either into a return well
or a body of water. The water quality is unaffected
other than a change in the temperature. Refer to the
installation manuals for water quality guidelines.
Typical Heat Pump Operation
Cooling Mode
In the cooling mode, hot high pressure refrigerant gas
is pumped from the compressor to the water-to-refrigerant heat exchanger via the reversing valve. Water, or
an anti-freeze solution, fl owing through the water-to-
refrigerant heat exchanger transfers heat from the
refrigerant to the fl uid raising the fl uid temperature
while condensing the hot gas into a liquid. This liquid
refrigerant then fl ows through a metering device,
where the refrigerant is expanded to a cold liquid, to
the air-to-refrigerant heat exchanger coil.
The air-to-refrigerant heat exchanger cools and dehumidifi es air by evaporating the liquid refrigerant. The
cooling cycle is completed when the refrigerant fl ows
as a low pressure gas through the reversing valve and
back to the suction side of the compressor. Cool
dehumidifi ed air is circulated to the space maintaining
comfort conditions.
This type of installation is only possible if there is
suffi cient ground water available in a well. The water
must be of good quality. Local codes may limit the use
of this system in certain areas. The arrangement is
referred to as an open system which means that water
Subject to change without prior notice
Heating Mode
During the heating mode, the high pressure refrigerant
gas is pumped from the compressor to the air-to-refrigerant heat exchanger coil via the reversing valve. In the
air-to-refrigerant heat exchanger coil, the heat is
removed by the air that passes over the coil surface,
and the hot gas condenses into a liquid.
The heated air is ducted to the space and provides
heating for the building. The refrigerant liquid then
fl ows through a metering device to the water-to-refrigerant heat exchanger.
tion, circulates through this heat exchanger and is
cooled by the evaporating refrigerant which evaporates into a gas. The heating cycle is completed
when the refrigerant fl ows as a low pressure gas
through the reversing valve and back to the suction
side of the compressor.
Water, or an anti-freeze solu-
Page 19
.
Typical Unit Installation
r
boschheatingandcooling.com | 18
Water-to-Air Heat Pump Cycle — Cooling
Cool Refrigerant Gas
Air to
Refrigerant
Loop Fluid
Loop Fluid
Figure 6
Loop Fluid
Thermal
Expansion
Valve
Warm Liquid Refrigerant
Water to
Refrigerant
Heat
Exchanger
Hot Refrigerant Gas
Heat
Exchanger
Cold Liquid Refrigerant
Hot Refrigerant Gas
Cool
Refrigerant Gas
ReversingValve
Hot
Refrigerant
Gas
Cool
Refrigerant
Gas
Compressor
Water-to-Air Heat Pump Cycle — Heating
Hot Refrigerant Gas
Air to
Refrigerant
Loop Fluid
Loop Fluid
Figure 7
Loop Fluid
Thermal
Expansion
Valve
Cold Liquid Refrigerant
Water to
Refrigerant
Heat
Exchanger
Cool Refrigerant Gas
Heat
Exchanger
Warm Liquid Refrigerant
Refrigerant Gas
Refrigerant
Hot Refrigerant Gas
Refrigerant
Cool
ReversingValve
Hot
Gas
Hot
Gas
Compresso
Vertical Unit Installation
Vertical units are normally installed in a closet or
mechanical plant room.
If installed in a closet or other confi ned space,
ensure adequate space for return air to the unit.
Suffi cient space must be provided for fi lter re-
placement and access to the compressor and
blower for service.
Units should be set on a piece of rubber, neoprene or
other vibration absorbing material at least 1/3" to 1/2"
thick. The pad should extend 3/4" over the entire base of
the unit.
Avoid direct line of sight to the unit. Install a sound
baffl e over any door that has a return air grille.
Unit Location
Any mechanical device will, at some point in time
require servicing and repair.
With this in mind suffi cient space must be provided
around the unit for service personnel to perform
maintenance or repair.
Units are not designed for outdoor installation. Avoid
locations where the unit may be exposed to freezing
conditions or where the humidity levels could cause
condensation on the unit panels, for example, when
exposed to outdoor ambient conditions.
Figure 8
ubject to change without prior notice
Page 20
19 | LV Model | Commercial Geothermal Heat Pumps
.
Typical Unit Installation
Horizontal Unit Installation
Figure 9
Horizontal units are typically suspended above the
ceiling by four (fi eld supplied) 3/8" threaded rods
fastened to the unit by the factory supplied hanger
bracket kits. The kits include rubber isolators to help
prevent transmission of vibration and noise to the
building structure. Units should be located directly below
a structural member, so that it is securely anchored.
A horizontal unit should be positioned to allow for
removal of the fi lters and access panels. Allow at least
18" clearance on each side of the unit for service and
36" in front of the unit for maintenance access. The
fi lter needs to be slid out and suffi cient space must
be provided to allow this.
Ductwork and
Sound Attenuation Considerations
Lining the fi rst fi ve feet of
supply duct reduces noise
Take-offs should be at
least fi ve feet away from
the plenum
Figure 10:
Supply Air Ducting
Sound is becoming an increasingly important factor in all
HVAC installations. The LV models has been designed to
minimize sound, but sound acoustical design plays an
important part of the sound level in the space.
Most of the problems associated with HVAC generated
sound can be avoided by paying close attention to
duct design and equipment placement.
A discharge fl ange is provided on all horizontal unit
models for fastening of ductwork. We recommend
using a fl exible collar between the discharge fl ange
and the duct transformation to reduce vibration
transmission from the cabinet and to simplify
disconnection of the unit from the ceiling ductwork.
Flex
duct
Turns attenuate
blower noise
Flex
duct
Do not install the unit above any piping or electrical
raceways. The unit should be able to be removed to
the fl oor without major rearrangement of other
mechanical or ceiling components.
Consideration needs to be made as to the location of
the units. Avoid installing units directly above occupied spaces (e.g. above offi ce desks or classrooms).
This will minimize possible disruption to the occupants if maintenance or service is required as well as
keeping a potential source of noise out of the area. If
possible, units should be installed above the hallway
drop ceiling in schools, and the supply and return air
is routed directly into classrooms. Local code may
require fi re dampers to be used in this application.
Subject to change without prior notice
Return air
fi lter and grill
Figure 11:
Return Air Ducting
Return air to the unit could be either free return or
ducted. The fi lter rack is provided with a 1" fl ange
should a ducted return be used. We recommend using
a fl exible collar between the return fl ange and the
duct transformation to reduce vibration transmission
from the cabinet and to simplify disconnection of
the unit from the ductwork.
Page 21
boschheatingandcooling.com | 20
.
Sound is transmitted down the ductwork and it is
important to avoid direct line of sight between the unit
and the space, both on the return or supply side. To
accomplish this, design the duct runs with two 90° turns.
As a general recommendation, duct interiors should have
1
an acoustic / thermal lining of least
/2" thick over the
entire duct run or a minimum of the fi rst 5 feet of the
supply trunk.
Line the last fi ve diameters of duct before each outlet
with a 1" thick sound blanket. Line elbows and transition
pieces, as well as a short distance upstream and downstream of the fi ttings.
Elbows, tees and dampers can create turbulence or
distortion in the airfl ow. Using aerodynamic fi ttings will
help in reducing this effect. Place a straight length of
duct, 5 to 10 times the duct width, before the next fi tting
to smooth out airfl ow.
Diffusers that are located in the bottom of a trunk duct
can also produce noise.Balancing dampers should be
located several duct widths upstream from an air outlet.
Ductwork should be mounted and supported using
isolation devices that absorb vibration.
Applications such as Hotel, Motel, Dormitory or Nursing
Home that use a single duct discharge are susceptible to
noise. These applications typically have low static
pressures and short duct lengths. In these applications
the discharge duct must be fully lined and have a square
elbow without turning vanes. A velocity not exceeding
500 to 600 fpm is recommended. Return air for these
applications should enter through a sidewall grille and
route up the stud space to a ceiling plenum.
For horizontal heat pumps mounted in the ceiling plenum, an insulated return plenum is sometimes placed at
the return air opening to further attenuate line-of-sight
sound transmission through return openings.
A high pressure stainless steel fl exible hose kit is recom-
mended to connect the unit to the building’s hard piping
and acts as a sound attenuator for both the unit operating
noise and hydraulic pumping noise. One end of the hose
has a swivel fi tting to facilitate removal of the unit for
replacement or service.
Hose kits come in several confi gurations, but in all cases
should include supply and return shutoff ball valves to
allow removal of a unit without the need to shut down the
entire heat pump system. The hose kit may contain either
a manual or automatic fl ow control that may be preset to
ensure correct water fl ow to the unit.
Pressure / Temperature ports should be included in these
fi ttings to allow the service technician to measure water
fl ow and temperatures when checking unit operation.
Condensate Drain Piping
Condensate piping can be made of steel, copper or PVC
pipe. In most cases, PVC pipe eliminates the need to wrap
insulation around the pipe to prevent sweating.
A 3/4" FPT condensate drain connection is installed in the
unit. The condensate piping must be trapped at the unit
and pitched away from the unit not less than 1/4" per foot.
A vent is required after the trap so that the condensate
will drain away from the unit. The vent can also act as a
cleanout if the trap becomes clogged. The condensate
drain should not be directly piped to a drain/waste/vent
stack. See local codes for the correct application of
condensate piping to drains.
Operating Limits
LV Models are capable of operating over a wide range of
conditions. For operation in a geothermal application or
any other installation where the loop fl uid temperature
may drop below the ambient dew point, the extended
range option is recommended. This consists of TXV in
lieu of capillary tubes and additional insulation on the
piping and wax exchanger to prevent condensation.
Piping
The water loop system is typically designed using a
“reverse return” piping system which includes a fl ow
control device so that fl ow requirements are met for
each zone.
Maximum and minimum fl uid conditions are at unit
rated fl ow rate.
Maximum and minimum operating limits may not be
combined. If one value is at either maximum or minimum,
the other two should be at normal operating range.
Entering fl uid temperatures below 45°F in the
heating mode requires antifreeze.
ubject to change without prior notice
Page 22
21 | LV Model | Commercial Geothermal Heat Pumps
.
Equipment Selection
To ensure that you get the optimal performance
from your FHP heat pump it is important that
they be selected accurately to match your
design conditions.
Prior to making equipment selections the
zone conditions need to be determined.
Bosch Thermotechnology Corp. recommends
using a building load program to determine the
heating and cooling loads.
The catalog provides a wide range of entering air and
water conditions that will meet most applications. The
unit performance can be determined by referring to
the data tables from page 23 to 35.
Our Bosch Select Tools Selection Software (BST)
is designed to provide you with a fast and accurate
selection based on your specifi c conditions. This soft-
ware is available through the commercial website. You
may click on the BST link and request an account.
Unit Operating Limits —LV Model
Operating Limits – Cooling & HeatingStandard UnitExtended Range Option
Cooling
Minimum ambient air temperature °F5050
Maximum ambient air temperature °F100100
Minimum evaporator entering air db/wb °F68/5768/57
Rated air coil entering air db/wb °F80/6780/67
Maximum evaporator entering air db/wb °F 95/8595/85
Minimum water coil entering fl uid temperature °F 5050
Water loop typical coil entering fl uid range temperature °F 70/9070/90
Maximum water coil entering fl uid temperature °F110110
Heating
Minimum ambient air temperature °F5040
Maximum ambient air temperature °F10085
Minimum evaporator entering air db °F5050
Rated air coil entering air °F6868
Maximum evaporator entering air db °F8080
Normal water coil entering fl uid range °F 50-8025-80*
Minimum water coil entering Fluid °F5020*
* Antifreeze solution is required at these fl uid temperatures.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
AHRI/ISO13256-1 certifi ed performance is rated at entering air conditions of 80.6°F
DB and 66.2°F WB in cooling and 68°F DB in heating.
Tabulated unit performance does not include fan or pump power corrections required
for AHRI/ISO standard performance ratings.
Unit performance may be interpolated. Extrapolation is not allowed.
For conditions other than rating conditions provided, consult the BST
selection software.
Ratings below 40°F are with a methanol solution.
The results reported herein are estimates based on testing by FHP. Variations in the
installation and operational environment may alter performance. Bosch disclaims all
warranties, express and implied, that the performance will be as reported, including
the warranty of merchantability and fi tness for purpose. In addition, continuous
research and development may result in a change to an appliances design and
specifi cations, which Bosch may change without notice. Before purchase, confi rm
the design specifi cations of the appliance.
208/230V units shipped with transformer wired for 230V—for 208V remove orange tranformer primary lead and replace with red lead.
All blower motors are single phase.
UNIT POWER SUPPLY: A voltage variation of +/- 10% of nameplate rating is acceptable. Phase imbalance shall not exceed 2%.
ubject to change without prior notice
Page 38
37 | LV Model | Commercial Geothermal Heat Pumps
.
Unit Electrical Data
with ECM Constant Torque
Model
LV015
LV018
LV024
LV030
LV036
Voltage
Code
Voltage/Hz/ Phase
1208-230/1/60197/25315.629.02.800.338.49.815
2265/1/60238/29214.620.02.600.337.28.415
1208-230/1/60197/25316.543.02.80.339.310.915
2265/1/60238/29215.846.02.60.338.49.915
1208-230/1/60197/25317.443.02.80.3310.212.115
2265/1/60238/29216.746.02.60.339.311.015
3208-230/3/60197/25315.963.02.80.338.710.215
4460/3/60414/50612.930.02.10.505.05.715
1208-230/1/60197/25319.954.02.80.3312.715.225
2265/1/60238/29218.546.02.60.3311.113.220
3208-230/3/60197/25316.963.02.80.339.711.415
4460/3/60414/50615.430.02.10.507.58.915
1208-230/1/60197/25311374.04.10.517.120.430
2265/1/60238/292111.367.03.90.515.218.025
3208-230/3/60197/25317.868.04.10.511.913.920
Voltage
Min/Max
CompressorBlower Motor
QuantityRLALRAFLAHP
Total Unit
FLA
Min.
Circuit
Amps
HACR
Breaker
LV041
LV042
LV048
LV060
LV070
4460/3/60414/50613.934.02.10.56.07.015
1208-230/1/60197/253113.688.06.00.7519.623.035
3208-230/3/60197/25318.868.06.00.7514.817.025
4460/3/60414/50614.434.04.60.759.010.115
1208-230/1/60197/253113.688.06.00.7519.623.035
3208-230/3/60197/25318.868.06.00.7514.817.025
4460/3/60414/50614.434.04.60.759.010.115
1208-230/1/60197/253115.784.06.00.7521.725.640
3208-230/3/60197/25311188.06.00.7517.019.830
4460/3/60414/50615.444.04.60.7510.011.415
1208-230/1/60197/253126.3145.07.61.0033.940.560
3208-230/3/60197/253115.6123.07.61.0023.227.140
4460/3/60414/50617.870.04.01.0011.813.820
1208-230/1/60197/253128.3158.07.61.0035.943.070
3208-230/3/60197/253119.2155.07.61.0026.831.650
4460/3/60414/50618.775.04.01.0012.714.920
Subject to change without prior notice
Page 39
.
Unit Electrical Data
with ECM Constant Airfl ow (Variable Speed)
boschheatingandcooling.com | 38
Model
LV015
LV018
LV024
LV030
LV036
Voltage
Code
Voltage/Hz/ Phase
1208-230/1/60197/25315.629.02.800.338.49.815
2265/1/60238/29214.620.02.600.337.28.415
1208-230/1/60197/25316.543.02.80.339.310.915
2265/1/60238/29215.846.02.60.338.49.915
1208-230/1/60197/25317.443.02.80.3310.212.115
2265/1/60238/29216.746.02.60.339.311.015
3208-230/3/60197/25315.963.02.80.338.710.215
4460/3*/60414/50612.930.02.60.335.56.215
1208-230/1/60197/25319.954.02.80.3312.715.225
2265/1/60238/29218.546.02.60.3311.113.220
3208-230/3/60197/25316.963.02.80.339.711.415
4460/3*/60414/50615.430.02.60.338.09.415
1208-230/1/60197/25311374.04.30.5017.320.630
2265/1/60238/292111.367.04.10.5015.418.225
3208-230/3/60197/25317.868.04.30.5012.114.120
Voltage
Min/Max
CompressorBlower Motor
QuantityRLALRAFLAHP
Total Unit
FLA
Min.
Circuit
Amps
HACR
Breaker
4460/3*/60414/50613.934.04.10.508.09.015
1208-230/1/60197/253113.688.06.80.7520.423.835
LV041
LV042
LV048
LV060
LV070
* 460V models with a constant airfl ow motor require a neutral wire to provide 265V power to the motor
3208-230/3/60197/25318.868.06.80.7515.617.825
4460/3*/60414/50614.434.05.50.759.911.015
1208-230/1/60197/253113.688.06.80.7520.423.835
3208-230/3/60197/25318.868.06.80.7515.617.825
4460/3*/60414/50614.434.05.50.759.911.015
1208-230/1/60197/253115.784.06.80.7522.526.440
3208-230/3/60197/25311188.06.80.7517.820.630
4460/3*/60414/50615.444.05.50.7510.912.315
1208-230/1/60197/253126.3145.09.11.0035.442.060
3208-230/3/60197/253115.6123.09.11.0024.728.640
4460/3*/60414/50617.870.06.91.0014.716.720
1208-230/1/60197/253128.3158.09.11.0037.444.570
3208-230/3/60197/253119.2155.09.11.0028.333.150
4460/3*/60414/50618.775.06.91.0015.617.825
ubject to change without prior notice
Page 40
39 | LV Model | Commercial Geothermal Heat Pumps
.
Blower Performance CFM
Standard PSC Blower Motor
Model
LV007
LV009
LV012
LV015
LV018
LV024
LV030
LV036
LV041
LV042
LV048
LV060
LV070
Available External Static Pressure (in. wc. wet coil and fi lter included)
Condensate Connection in. FPT3/43/43/43/43/43/43/4
Refrigeration Charge (oz)14152119282937
Air Coil Dimensions (H x W)10 x 1410 x 1410 x 1412 x 16.516 x 16.520 x 16.520 x 16.5
Std. Filter - 1" Throwaway (L x H)10 x 1610 x 1610 x 1616 x 2016 x 2020 x 2020 x 20
Opt. Filter - 2" MERV-8 or -13
Throwaway (L x H)
Weight - Operating (lbs)98103105123173177190
Weight - Shipping (lbs)126130132151201205217
Refrigeration Charge (oz)17191919292939
Air Coil Dimensions (H x W)10 x 1410 x 1410 x 1412 x 16.516 x 16.516 x 20.516 x 20.5
Std. Filter - 1" Throwaway (L x H)10 x 1610 x 1610 x 1616 x 2016 x 2016 x 2516 x 25
Opt. Filter - 2" MERV-8 or -13
Throwaway (L x H)
Weight - Operating (lbs)98103105127177181194
Weight - Shipping (lbs)128132134158208212224
400400400400400400400
10 x 1610 x 1610 x 1616 x 2016 x 2020 x 2020 x 20
10 x 1610 x 1610 x 1616 x 2016 x 2016 x 2516 x 25
LV030
PSC Fan
Motor &
Blower
ECM Fan
Motor &
Blower
Water
Connection
Size
Vertical
Cabinet
Horizontal
Cabinet
LV ModelsLV036LV041LV042LV048LV060LV070
Compressor Type (Qty. 1)
Max Water Working Pressure (PSIG/kPa)400400400400400400
Fan Motor Type/SpeedsPSC/3PSC/3PSC/3PSC/3PSC/3PSC/3
Fan Motor (HP)1/21/21/23/43/43/4+
Blower Wheel Size (Dia. x W)9x710x810x810x811x911x9
Fan Motor Type/SpeedsX13 / EONX13 / EONX13 / EONX13 / EONX13 / EONX13 / EON
Fan Motor (HP)1/21/23/43/411
Blower Wheel Size (Dia. x W)9x710x810x810x811x911x9
FPT 3/4 3/4 3/41 1 1
Coaxial Coil Volume (gal)0.270.270.270.490.620.62
Condensate Connection in. FPT3/43/43/43/43/43/4
Refrigeration Charge (oz)484848525973
Air Coil Dimensions (H x W)24x20.220x1624x20.224x26.7524x26.7532x26.2
Std. Filter - 1" Throwaway (L x H)24x2420x2024x2424x3024x3016x30 @2
Opt. Filter - 2" MERV-8 or -13 Throwaway (L x H)24x2420x2024x2424x3024x3016x30 @2
Weight - Operating (lbs)229217239287307336
Weight - Shipping (lbs)255243265312331360
Refrigeration Charge (oz)46N/A43446461
Air Coil Dimensions (H x W)18x27.5N/A18x27.520x3220x3220x42
Std. Filter - 1" Throwaway (L x H)18x30N/A18x3020x34.520x34.520x24 @2
Opt. Filter - 2" MERV-8 or -13 Throwaway (L x H)18x30N/A18x3020x34.520x34.520x24 @2
Weight - Operating (lbs)237N/A231268288316
Weight - Shipping (lbs)270N/A264299318365
Reciprocating Reciprocating Reciprocating
ScrollScrollScroll
* Unit sizes 024 & 030 with -4 voltage (460/3/60), the X13 motor will be 1/2 HP rather than 1/3 HP.
ubject to change without prior notice
Page 44
43 | LV Model | Commercial Geothermal Heat Pumps
ithout
.
Horizontal Cabinet Corner Weights
Confi gurationLeft Hand EvaporatorRight Hand Evaporator
ModelTotal
LVH 007
LVH 009
LVH 012
LVH 015
LVH 018
LVH 024
LVH 030
LVH 036
LVH 042
LVH 048
LVH 060
LVH 072
Left
Front*
Lbs982821252421282425
kg451310111110131111
Lbs1032923262523292526
kg471310121110131112
Lbs1052924262624292626
kg481311121211131212
Lbs1273628342928362934
kg581613151313161315
Lbs1775736483736573748
kg802616221716261722
Lbs1815837483837583848
kg822617221717261722
Lbs1946141524141614152
kg882818231918281923
Lbs2377149665249715266
kg1083222302422322430
Lbs2317047645047705064
kg1053221292321322329
Lbs2688760626060876062
kg1223927282727392728
Lbs2888865696665886669
kg1314029313029403031
Lbs3169872767072987076
kg1434432353232443235
Right
Front*
Left Back
Right
Back
Left
Front*
Right
Front*
Left Back
Right
Back
NOTE: * Front is control box end.
ubject to change w
prior notice
Page 45
.
Vertical Unit Dimensions
boschheatingandcooling.com | 44
Overall unit dimensions do not include fi lter rack or duct fl anges.
ABC D E F G H J K M N PQ
Height
Depth
Model
LV007
LV009
LV012
LV015
LV018
LV024
LV030
LV036
LV041
LV042
LV048
LV060
LV070
All dimensions within +– 0.125“. All condensate drain connections are 3/4“ FPT. LV015-070 can be fi eld converted between end blow and straight
through supply air confi gurations. Specifi cations subject to change without notice.
1" fi lter rack extends 1.23" beyond the side of the unit. 2" fi lter rack extends 2.89" beyond the side of the unit.
The 2" fi lter rack is 4 sided with a fi lter access door on one end and can accept either a 1" or 2" fi lter.
All dimensions within +– 0.125". All condensate drain connections are 3/4" FPT. LV015-070 can be fi eld converted between end blow and straight
through supply air confi gurations. Specifi cations subject to change without notice.
1" fi lter rack extends 1.23" beyond the side of the unit. 2" fi lter rack extends 2.89" beyond the side of the unit.
The 2" fi lter rack is 4 sided with a fi lter access door on one end and can accept either a 1“ or 2" fi lter.
Return Air
D
E
T
R
F
H
Electrical
Knock-Outs
G
Compressor
Access
C
B
Opening
M
C
K
J
N
Condensate
Drain
Q
K
N
P
B
A
A
Return Air
Opening
Condensate
Drain
Left Hand Return End Blow (FLE) Left Hand Return
Straight Through (FLS)
Models LV048 & 060 Left Hand Return units have condenser water
connections on the front right and electrical knockouts on the front left.
Recommended
Replacement
Condenser
Water Out
Condenser
Water In
Return Air
D
E
Condensate
Drain
T
F
Opening
Q
R
K
N
J
B
C
Condensate
Drain
A
Return Air
Opening
A
M
K
P
N
B
Right Hand Return End Blow (FRE) Right Hand Return
Straight Through (FRS)
Service Clearances
AIR COIL
Blower Access
18" Minimum
24" Optimum
Blower
NOTE: The local electric codes may require 36" or more clearance at the electrical control box.
Subject to change without prior notice
Electrical
Control
Compressor
Box
Compressor Access and
Control Access
24" Minimum
36" Optimum
C
Page 47
.
Counterfl ow Unit Dimensions
boschheatingandcooling.com | 46
Overall unit dimensions do not include fi lter rack or duct fl anges.
All dimensions within +– 0.125“. All condensate drain connections are 3/4“ FPT. LV015-070 can be fi eld converted between end blow and straight
through supply air confi gurations. Specifi cations subject to change without notice.
1" fi lter rack extends 1.23" beyond the side of the unit. 2" fi lter rack extends 2.89" beyond the side of the unit.
The 2" fi lter rack is 4 sided with a fi lter access door on one end and can accept either a 1" or 2" fi lter.
Compressor Access
Condenser
H
C
J
Water Out
Condenser
Water In
C
Recommended
Replacement
Up 1"
Electrical
Knock-Outs
Blower Access
B
A
Condensate
Drain
A
B
Left Hand Return (FLB) Right Hand Return (FRB)
Front of Unit
Return Air (Filter) View
Compressor
Electrical
Control
Box
A
I
R
C
O
Blower
I
L
Service Clearances
NP
M
CompressorAccessand
Electrical/Control Access
24" Minimum
36" Optimum
Blower Access
18" Minimum
24" Optimum
NOTE: The local electric codes may require 36" or more clearance at the electrical control box.
ubject to change without prior notice
Page 48
47 | LV Model | Commercial Geothermal Heat Pumps
.
Guide Specifi cation
1.0 General
Furnish and install FHP water source heat pumps as indicated on the plans with capacities and characteristics as
listed in the schedule and the specifi cations that follow.
The units shall be manufactured in an ISO 9001:2000
certifi ed facility.
2.0 Horizontal/Vertical/Counterfl ow
Water Source Heat Pumps
The units shall be designed to operate with entering fl uid
temperatures between 50˚F (10˚C) and 100˚F (38˚C)
in cooling and between 50˚F (10˚C) and 80˚F (27˚C)
in heating. With the optional factory installed extended
range package, units shall operate with entering fl uid
temperatures between 50˚F (10˚C) and 110˚F (43.3˚C)
in cooling and between 20˚F (-6.6˚C) and 80˚F (27˚C)
in heating. Equivalent units from other manufacturers
can be proposed, provided approval to bid is given 10
days prior to bid closing. All equipment with a nominal
capacity of 135,000 BTUH Total Cooling or lower
must be listed in the current AHRI Applied Equipment
Directory under the AHRI Standard AHRI/ISO- 13256-1,
WLHP, GWHP and GLHP certifi cation points.
All equipment in this section must meet or exceed the
DOE mandated minimum EER’s and COP’s as listed in
ASHRAE 90.1 as follows:
For the AHRI/ISO-13256-1, WLHP Rating (12.0 EER
and 4.2 COP for units larger than a nominal 17,000
BTUH Total Cooling – 11.2 EER and 4.2 COP for units
below a nominal 17,000 BTUH Total Cooling).
For the AHRI/ISO-13256-1, GLHP Rating a minimum
13.4 EER and 3.1 COP. All units shall be listed with
Underwriters Laboratories (UL) for safety.
2.01 Basic Construction
A. Units shall have the airfl ow arrangement as
shown on the plans. If units with these arrangements are not used, the contractor supplying the
water source heat pumps is responsible for any
extra costs incurred by other trades and must
submit detailed mechanical drawings showing
ductwork requirements and changes or relocation
of any other mechanical or electrical system. If
other arrangements make servicing diffi cult, the
contractor must provide access panels and clear
routes to ease service. The architect must approve all changes 10 days prior to bid.
Subject to change without prior notice
B. All units shall have stainless steel drain pans to
comply with this project’s IAQ requirements.
Painted steel or plastic is not acceptable.
C. The cabinet shall be fabricated from heavy-gauge
galvanized steel for superior corrosion protection. All interior surfaces shall be lined with 1/2"
(12.7mm) thick, multi density, coated, glass fi ber
insulation. Insulation within the air handling
section shall not have any exposed edges. All
insulation must meet NFPA 90A and be certifi ed
to meet the GREENGUARD® Indoor Air Quality
Standard for Low Emitting Products. One blower
access panel and two compressor compartment
access panels shall be removable with supply and
return air ductwork in place.
D. Unit shall have a fl oating compressor or pan con-
sisting of a 1/2" (12 mm) thick high density elas-
tomeric pad between the compressor base plate
and the unit base pan to prevent transmission of
vibration to the structure.
E. Units shall have a 1" fi lter rack and 1" thick throw-
away type glass fi ber fi lter as standard. Units shall
have an optional 2" thick pleated MERV 8 fi lter
(size 007-070) or MERV 13 fi lter (size 015 and
larger with upgraded ECM) available. The fi lter
rack shall incorporate a 1" duct fl ange. The units
shall have an insulated divider panel between the
air handling section and the compressor section
to minimize the transmission of compressor noise,
and to permit service testing without air bypass.
F. Cabinets shall have separate holes and knockouts
for entrance of line voltage and low voltage control wiring.
Supply and return water connections shall be
brass female pipe thread fi ttings and mounted fl ush to cabinet exterior. Connections that require
a back up wrench or that extrude past the unit
corner post are not acceptable. Condensate connections will be stainless steel female pipe thread
fi ttings. Plastic is not acceptable.
G. Hanging brackets shall be provided as standard
for horizontal units.
Page 49
.
Guide Specifi cation
boschheatingandcooling.com | 48
2.02 Fan and Motor Assembly
A. The fan shall be direct-drive centrifugal forward
curved type with a dynamically balanced wheel.
The housing and wheel shall be designed for
quiet low velocity operation. The blower housing
shall feature a removable inlet ring to facilitate
removal and servicing of the fan motor. The fan
motor shall be 3-speed, permanently lubricated,
PSC type with thermal overload protection.
B. 15,000 Btu/Hr to 70,000 Btu/Hr models shall
have an optional constant torque electronically
commutated motor for premium fan effi ciency.
These motors shall feature 5 pre-programmed
torque settings that can be changed in the fi eld to
match design requirements. 460 V – 3 Ph – 60 Hz
units with these motors must be able to operate
without the need for a neutral wire for the motor.
C. 15,000 Btu/Hr to 70,000 Btu/Hr models shall have
an optional constant CFM electronically commutated
motor for premium fan effi ciency and constant
air delivery over a wide range of external static
pressures. These motors shall be fi eld adjustable
for +/- 15% of nominal design airfl ow. These motors
shall provide feedback to the unit control box to verify
motor operating mode and delivered CFM.
2.03 Refrigerant Circuit
Units shall use R-410A refrigerant. All units shall have
a factory sealed and fully charged refrigerant circuit
with the following components:
A. Hermetic compressor: Hermetic reciprocating,
rotary, or scroll compressors shall be specifi cally
designed for R-410A refrigerant and shall be
internally sprung (if reciprocating), externally
isolated and with thermal overload protection.
B. Refrigerant metering thermal expansion valves or
capillary tubes.
C. The fi nned tube heat exchanger shall be
constructed of lanced aluminum fi ns not exceeding
sixteen fi ns per inch bonded to rifl ed copper tubes
in a staggered pattern and will have a 600 PSIG
(4140 kPa) working pressure. The heat exchanger
shall have aluminum end sheets.
Optional Air Coil Protection: The fi nned tube
heat exchanger shall have optional DuoGuard™
protective coil coating. This corrosion protection
shall consist of tin plated copper tubing with
coated aluminum fi ns that must pass 1000 hours
of ASTM B117 salt fog testing. Painted, dipped or
e-coated heat exchangers are not acceptable.
D. Reversing valve. Reversing valves shall be four-
way solenoid activated refrigerant valves which
shall fail to the heating operation should the
solenoid fail to function. Reversing valves which
fail to the cooling operation shall not be allowed.
E. Coaxial (tube in tube) refrigerant to water heat
exchanger. Refrigerant to water heat exchangers
shall be of copper inner water tube and steel
outer refrigerant tube design rated to withstand
600 PSIG working refrigerant pressure and 400
PSIG working water pressure. Shell and Tube
style refrigerant to water heat exchangers shall
be treated as pressure vessels and shall require
refrigerant pressure relief valves piped to the
exterior of the building. The contractor supplying
the water source heat pumps with Shell and
Tube heat exchangers shall be responsible for
any additional installation costs. Brazed Plate
water to refrigerant heat exchangers shall require
additional centrifugal separators added to the
supply water piping at each unit. Each separator
shall have an automated clean out valve piped to a
waste line. The contractor supplying water source
heat pumps with Brazed Plate heat exchangers
shall be responsible for any additional costs.
Option for E: Cupro-Nickel water coil – The
refrigerant to water heat exchanger shall be of
Cupro-Nickel inner water tube construction.
F. Safety controls include both a high pressure
and low pressure switch. Temperature sensors
shall not replace these safety switches. See
the controls section of this specifi cation for
additional information.
G. Access fittings shall be factory installed on high and low
pressure refrigerant lines to facilitate field service.
ubject to change without prior notice
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49 | LV Model | Commercial Geothermal Heat Pumps
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Guide Specifi cation
H. Activation of any safety device shall prevent
compressor operation via a lockout circuit. The
lockout circuit shall be reset at the thermostat
or at the contractor supplied disconnect switch.
Units which may be reset at the disconnect
switch only shall not be acceptable. Refer to
solid state safety circuit below.
2.04 Electrical
Controls and safety devices will be factory wired
and mounted within the unit. Controls shall include
fan relay, compressor contactor, 24V transformer,
reversing valve coil and solid state lockout controller,
Unit Protection Module (UPM). The standard
transformer shall be rated for a minimum 50 VA. All
units shall be name-plated for use with time delay
fuses or HACR circuit breakers. Unit controls shall be
24 volts.
Option: Optional transformers shall be rated 75VA
and shall have a push button reset circuit breaker on
the secondary power.
refrigerant pressure, low refrigerant pressure, low water
temperature and a high level of condensate in the drain
pan. The LED will display each fault condition as soon as
the fault occurs. If a hard lockout occurs, then the fault
LED will display the type of fault until the unit is reset.
The UPM shall feature the following fi eld confi gurable
adjustments:
1. Lock out reset on thermostat interruption or power
reset.
2. 2 or 4 restart attempts before a hard lockout.
3. Test mode (reduces all time delays to 5 seconds for
diagnostic work).
4. Antifreeze setting for low water temperature sensor.
Safety devices include:
1. Low pressure cutout set a 40 PSIG (280 kPA) for loss
of charge protection (freezestat and/or high discharge gas temperature sensor is not acceptable).
2. High pressure cutout control set at 600 PSIG
(4125 kPA).
2.05 Solid-State Safety Circuit
All units shall have a solid-state UPM safety control
circuit with the following features:
1. Anti-short cycle time delay (5 minute delay on break).
2. Random start time delay on initial power.
3. Brown out/surge/power interruption protection.
4. 120 second low pressure switch bypass timer.
5. High refrigerant pressure shutdown.
6. Low refrigerant pressure shutdown.
7. Low water temperature shutdown (adjustable for
closed loop systems).
8. Air coil freeze protection shutdown.
9. High condensate level shutdown.
10. 24 VAC alarm output for remote fault indication.
The UPM shall automatically reset after a safety shut
down. Restart the unit if the cause of the shut down
no longer exists (except for low temperature and
high condensate level shutdowns). Should a fault
re-occur within 60 minutes after reset, then a “hard”
lockout will occur. A light emitting diode (LED) shall
annunciate the following alarms: brown out, high
Subject to change without prior notice
3. Low supply water temperature sensor that detects
drops in refrigerant temperature that could result in
water coax heat exchanger freezing.
4. Low air coil temperature sensor that detects drops in
refrigerant temperature that could result in air heat
exchanger freezing.
5. High level condensate sensor that shuts off the
compressor if the condensate drain pan fi lls
with water.
6. On board voltage detection that disables the compressor control circuit if there are extreme variations
in supply voltage.
An optional energy management relay that allows unit
control by an external source shall be factory installed. A
terminal block with screw terminals shall be provided for
control wiring.
2.06 Options
A. Units shall have an optional 2-way electrically
operated shut-off valve mounted internally in the
unit cabinet.
B. Units shall have an optional water fl ow regulating
valve set to 3 gallons per minute of water fl ow per
nominal ton of refrigeration capacity.
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Guide Specifi cation
boschheatingandcooling.com | 50
C. Extra quiet construction: Optional compressor
blanket shall be provided on units having a
capacity above 18,000 BTUH.
D. Hot Gas Reheat: Units as noted on the schedule
shall be equipped with optional Hot Gas Reheat
(HGRH) on units having a capacity above 12,000
BTUH. HGRH shall be either on/off control or
modulating as noted in the specifi cations.
On/Off HGRH shall be controlled by a humidistat
connected to the unit H terminal and shall start
the unit in the reheat mode should the humidity
be above set-point once the thermostat control
is satisfi ed. Cooling or heating requirements
shall take precedent over HGRH.
Modulating Hot Gas Reheat (MHGRH) shall
be active during the cooling mode. A 0 - 10
VDC signal from a sensor located in the unit
discharge air supply shall modulate the hot gas
valve to maintain an adjustable preset leaving
air temperature to the conditioned space.
E. Hot Gas Bypass: For units as noted on the
schedule, supply each unit with a ETL listed
modulating hot gas bypass valve with factory
supplied and installed controls to prevent air
coils from frost development by taking hot gas
and bypassing the water coil and expansion
device and reintroducing the hot gas into the
refrigerant line prior to the air coil. The hot
gas bypass valve shall maintain a minimum
refrigerant suction pressure to allow for a
light load cooling mode or a low entering air
temperature cooling mode.
H. Factory-installed control options: Water
differential pressure switch, 75 VA transformer
(resettable), phase loss and reversal protection,
and unit mounted disconnect switch.
I. A 2", four-sided fi lter rack is optional to
accommodate nominal 2" thick pleated fi lters.
J. DDC Controls: Unit shall be equipped with
a factory installed DDC control capable
of interfacing with BacNet, Modbus, N2
and Lonworks. The controller shall be preprogrammed to control the unit and monitor
the safety controls. The unit shall be able to
operate as a standalone or be incorporated
into the building management system. A leaving
water and leaving air sensor shall be installed
in the unit. Wall sensors shall be available for
controlling zone temperature.
3.0 Hose Kits
All units shall be connected with hoses. The hoses
shall be either 2 or 3 feet long, braided stainless steel,
fi re rated hoses complete with adapters. Non-fi re
rated hoses are not acceptable. Optional ball valves
with P/T ports, fl ow controller, Y strainer and electric
valve shall be in included as specifi ed in the schedule.
F. Water Differential Pressure Switch: Prevents
unit operation if there is no fl uid fl ow. This
factory installed, internally mounted device
shall be rated at 600psi and disable the
compressor if a lack of water-fl ow occurs.
G. Water Side Economizer: Water side economizer
shall be completely installed at the factory, with
an additional condensate drain pan, motorized
3 way valve, aqua stat, and all internal electric
controls. Water side economizer shall be rated
at 400 psi and UL listed for application with the
heat pump. This option is externally mounted
outside the unit.
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