Bosch LV007 User Manual
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LV Model
Water Source Heat Pump
1/2 to 6 ton
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.
boschheatingandcooling.com | 1bos
LV
MODEL
UP TO
P TO
16.9
EER
GLHP
UP TO
5.3
COP
WSHP
Commercial Sales Catalog
boschheatingandcooling.com
1 | LV Model | Commercial Geothermal Heat Pumps
.
Table of Contents
MODEL NOMENCLATURE ..............................................2
CERTIFIED PERFORMANCE DATA .................................2
FHP EQUIPMENT ............................................................3
ADVANTAGES OF FHP’s TECHNOLOGY ........................3
LV MODEL 007-070 .........................................................3
FEATURES, FUNCTIONS AND BENEFITS .................. 3-5
Cabinet ......................................................................3
Quiet Operation .......................................................4
Serviceability ...........................................................4
Unit Confi gurations ...................................................4
Filter Racks and Options ..........................................4
Optional MERV-8 and -13 Filter.................................4
FAN MOTOR ....................................................................5
Permanent Split Capacitor Motors (PSC) ................5
ECM Constant Torque Motor (Optional) ..................5
ECM Constant Airfl ow Motor ...................................5
Hanging Brackets ......................................................5
Water Connections ...................................................5
Two-Position Water Valve..........................................5
Refrigerant Circuit ....................................................5
Evaporator Coil and DuoGuard
TM
.............................6
Blower Housing .........................................................6
Unit Protection Module ......................................... 6-7
UPM CONTROL BOARD FEATURES ...........................7-8
ADDITIONAL OPTIONS ................................................. 8
Hot Gas Reheat ........................................................ 8
Hot Gas Reheat Control Options .............................9
Special Considerations .............................................9
Low Temperature Well Water ...................................9
Indoor Pool Dehumidifying During Winter Months .....9
Sequence of Operation - Modulating
Hot Gas Reheat (MHGRH) ........................................9
Hot Gas Bypass .........................................................9
Psychrometric Chart ............................................... 10
DDC Controls ................................................................10
DDC Room Sensors ................................................ 10
DDC Zone Sensors ..................................................11
Waterside Economizer Common Waterside
Economizer Applications .........................................11
Fluid Flow ................................................................11
Aquastat .................................................................. 12
Air Side Pressure Drop ........................................... 12
Fluid Differential Pressure Switch .......................... 12
Energy Management Switch (EMS) ....................... 12
OTHER OPTIONS ..........................................................13
ACCESSORIES .............................................................13
Thermostats ............................................................ 13
Hose Kits ................................................................. 13
UNIT CONFIGURATION DIAGRAMS ........................... 14
SYSTEMS .......................................................................15
Water Source Cooling Tower/Boiler Systems ........ 15
Geothermal Systems .............................................. 15
Earth Coupling Options ......................................15-16
Vertical Ground Loop System.................................16
Horizontal Ground Loop System ............................ 16
Surface Water, Lake or Pond System ......................17
Well Water System ...................................................17
TYPICAL HEAT PUMP OPERATION.............................. 17
Cooling Mode ...........................................................17
Heating Mode ...........................................................17
TYPICAL UNIT INSTALLATION .....................................18
Water-to-Air Heat Pump Cycle - Cooling ................. 18
Water-to-Air Heat Pump Cycle - Heating................. 18
Unit Location...........................................................18
Vertical Unit Installation .........................................18
Horizontal Unit Installation .................................... 19
Ductwork & Sound Attenuation Considerations .... 19
Piping ......................................................................20
Condensate Drain Piping ........................................20
Operating Limits – Cooling & Heating .............. 20-21
EQUIPMENT SELECTION.............................................. 21
ANTIFREEZE CORRECTION DATA ...............................22
WATERSIDE PRESSURE DROP ....................................22
CAPACITY DATA ..................................................... 23-35
LV007 (300 CFM) ....................................................23
LV009 (350 CFM) ...................................................24
LV012 (400 CFM) ....................................................25
LV015 (500 CFM) ....................................................26
LV018 (650 CFM) .................................................... 27
LV024 (850 CFM) ....................................................28
LV030 (950 CFM) ...................................................29
LV036 (1200 CFM) ................................................. 30
LV041 (1150 CFM) ................................................... 31
LV042 (1500 CFM) ..................................................32
LV048 (1600 CFM) ..................................................33
LV060 (2000 CFM) .................................................34
LV070 (2200 CFM) ..................................................35
UNIT ELECTRICAL DATA .............................................. 36
Standard Blower Motor ..........................................36
ECM Constant Torque ............................................37
ECM Constant Airfl ow (Variable Speed) ............... 38
BLOWER PERFORMANCE CFM .................................. 39
Standard Blower Motor ..........................................39
ECM Constant Torque ........................................... 40
ECM Constant Airfl ow (Variable Speed) ................ 41
PHYSICAL DATA ........................................................... 42
HORIZONTAL CABINET CORNER WEIGHTS .............. 43
VERTICAL UNIT DIMENSIONS .................................... 44
HORIZONTAL UNIT DIMENSIONS ............................... 45
COUNTERFLOW UNIT DIMENSIONS .......................... 46
GUIDE SPECIFICATION .......................................... 47-50
Subject to change without prior notice
.
Model Nomenclature
LV 036 1 VT C F L T P U A
boschheatingandcooling.com | 2
MODEL:
LV
NOMINAL CAPACITY:
007, 009, 012, 015, 018,
024, 030, 036, 041, 042,
048, 060, 070
VOLTAGE DESIGNATION:
0 - 115/60/1 (LV012 only)
1 - 208/60/1 & 230/60/1
2 - 265/60/1
3 - 208/60/3 & 230/60/3
4 - 460/60/3
5 - 575/60/3
CABINET CONFIGURATION:
VT - Vertical
HZ - Horizontal
CF - Counterfl ow (Downfl ow)
COAX OPTIONS:
C - Copper
N - Cupro-Nickel
REVISION LEVEL:
A - Current
AIR COIL OPTIONS:
U - Uncoated Air Coil
D - DuoGuard™ Air Coil
FAN/MOTOR OPTIONS:
P - Standard PSC
A - ECM Constant Airfl ow
T - ECM Constant Torque
DISCHARGE AIR CONFIGURATION:
T - Top
S - Straight
E - End
B - Bottom
RETURN AIR CONFIGURATION:
L - Left
R - Right
WATER CONNECTIONS:
F - Front
Certifi ed Performance Data
AHRI/ANSI 13256-1 Performance Data
Entering Water Temperatures
Model
LV007 2.0 6,100 12.20 7,800 5.30 6,800 15.10 4,900 3.40
LV009 2.5 8,200 12.40 9,900 4.70 8,700 14.60 5,740 3.20
LV012 3 10,900 12.20 13,000 4.30 11,800 14.10 8,700 3.20
LV015 4 14,200 12.80 16,100 4.40 14,200 14.60 11,300 3.30
LV018 5.0 19,400 13.40 22,200 4.60 21,200 15.80 14,300 3.50
LV024 6 23,400 13.40 26,600 4.40 25,000 15.50 17,000 3.40
LV030 7 29,200 13.20 33,400 4.30 31,000 14.70 20,900 3.30
LV036 9 37,900 14.70 41,800 4.60 39,900 16.90 26,900 3.50
LV041 9 39,500 13.10 44,600 4.30 41,200 14.30 29,400 3.20
LV042 10 40,000 13.70 46,300 4.30 42,600 14.80 31,000 3.30
LV048 12 45,900 13.00 56,400 4.30 48,800 14.90 35,400 3.40
LV060 15 57,900 13.00 67,200 4.30 60,100 14.10 46,900 3.20
LV070 16 64,000 13.30 72,800 4.40 66,400 15.00 50,800 3.40
LV015 4 13,700 13.90 15,500 4.40 14,400 16.20 10,700 3.30
LV018 5.0 19,700 14.40 21,900 4.80 21,500 15.90 14,100 3.70
LV024 6 23,800 14.50 26,200 4.60 25,400 16.80 16,700 3.60
LV030 7 30,000 15.00 32,800 4.60 31,600 17.50 20,400 3.40
LV036 9 38,200 15.40 41,400 4.70 40,200 17.70 26,500 3.60
LV041 9 40,500 13.60 43,700 4.40 42,200 15.90 28,500 3.60
LV042 10 40,900 14.10 45,300 4.40 43,500 16.30 30,100 3.50
LV048 12 46,800 14.20 55,600 4.50 49,600 16.30 34,600 3.60
LV060 15 59,000 14.30 66,400 4.30 61,100 16.40 46,200 3.30
LV070 16 65,200 14.60 71,800 4.60 67,600 16.60 50,000 3.50
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 Loop Ground 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)
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.
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.
5 | LV Model | Commercial Geothermal Heat Pumps
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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
boschheatingandcooling.com | 6
.
Compressors Tin 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
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
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
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
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. Coil Reheat
5
5
5
0
55 60 65 70 75 80 85 90 95 100
.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
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).
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
13 | LV Model | Commercial Geothermal Heat Pumps
.
Thermostats Hose 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
.
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 FLT Right 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
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
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