Taco Glen Dimplex System M User manual

System M
Air-to-Water Heat Pump Outdoor Unit
HydroBox Building & User Interface Indoor Unit
Installation and
Operating Instructions
Document #: 802-001
Plant #: 001-5040
Effective Date: July 15, 2022
Powered By
Glen
Dimplex

2
Table of Contents
1. Please Read Immediately.......................................
1.1 Intended Use
1.2 Legal Regulations and Directives
1.3 Energy Efcient Use of the Heat Pump
1.4 Inspection of Equipment
1.5 Handling of the Unit
1.6 Unit Protection on Job Site
2. Intended Use of the System M Heat Pump..........
2.1 Area of Application
2.2 Operating Principle
3. Scope of Supply.....................................................
3.1 Basic Heat Pump Components
3.2 Basic HydroBox Components
3.3 HydroBox
4. Transport and Access............................................
4.1. Heat Pump
4.2 HydroBox
5. Installation..............................................................
5.1 General
5.2 Acoustic Emissions
5.3 General - HydroBox
6. Assembly / Connection.........................................
6.1 Installing the Electric Wires
6.2 Condensate Drain
6.3 Connection on Heating Side
6.4 Domestic Hot Water Connection
6.5 Temperature Sensor Connection
6.6 Electrical Connection
7. Touch Screen User Interface and App.................
7.1 Installing the GDTS Home App
7.2 Set-up of the System M
7.3 Navigation of the User Interface (UHI)
8. Air Purging..............................................................
9. Cleaning / Maintenance.........................................
9.1 Maintenance
9.2 Cleaning Heat Pump
9.3 Cleaning the HydroBox
10. Faults / Troubleshooting.......................................
3
4
5
6
7
8
21
23
23
23
11. Decommissioning / Disposal................................
12. Device Information.................................................
13. Dimension Drawing...............................................
13.1 Dimension Drawing Heat Pump
13.2 Dimension Drawing Legend
13.3 Dimension Drawing HydroBox
13.4 Dimension Drawing Optional
Domestic Hot Water Tank (SMT85-1)
14. Diagrams................................................................
14.1 Characteristic Curves Heating
14.2 Characteristic Curves Cooling
15. Information on the Use of Data............................
16. Declaration of Conformity.....................................
17. FCC Caution...........................................................
18. Limited Warranty Statement.................................
23
24
26
29
31
32
32
32

3
1. Please Read Immediately
1.1 Intended Use
1.3 Energy Efcient Use of the Heat Pump
1.4 Inspection of Equipment
1.5 Handling of the Unit
1.6 Unit Protection on Job Site
These devices are only intended for use as specied by the manufactur-
er. Any other use beyond that intended by the manufacturer is prohibited.
This requires the user to abide by the relevant project planning documents,
specications and installation and operating instructions. Please refrain
from tampering with or altering the device.
By operating this heat pump you are helping to protect our environment.
The heating system must be properly designed and dimensioned to
ensure efcient operation. It is particularly important to keep water ow
temperatures as low as possible in heating operation. All connected heat
emitters should therefore be suitable for low ow temperatures. Raising
the heating water temperature by 1.8°F (1°C) corresponds to an increase
in electric energy consumption of approx. 2.5%. Low temperature heating
systems with ow temperatures between 85°F and 125°F (30°C and 50°C)
are particularly well-suited for energy efcient operation.
Upon receipt of equipment, check the shipment against the packing slip
and the freight company bill of lading. Verify that all units and packages
have been received. Inspect the packaging of each unit for damages.
Any damage should be reported to the freight company immediately to
make sure they can not deny claims. Notify the wholesaler or party you
purchased this equipment from of any damages. It is the responsibility of
the purchaser to notify relevant parties and le the necessary claims with
the freight company.
The Heat Pump outdoor unit includes a TiltWatch® label on the packaging to
monitor if the unit has been tipped more than 45 degrees during shipment.
If this label has been activated, notify the freight company and contact Taco
customer service.
Do not clamp on the sides of either the HydroBox indoor unit or Heat Pump
outdoor unit when lifting or transporting the units into place. Damage can
occur to the panels of the units. Also take caution during transportation as
the outdoor unit may be top-heavy. Both units are too heavy for one person
to lift. It is highly recommended to install the HydroBox and heat pump with
two people. Use caution not to drop the units, which could cause damage
to the unit, property and/or sever personal injury.
Keep both units covered in the original packaging or equivalent
protective covering to protect the units from damage and contamination
due to paint spray, plastering or other airborne materials that may be
used during construction on the job site. This is especially important for
protecting the outdoor unit’s heat exchanger intake and outlet areas. All
piping connections should remain capped or recapped until the piping is
connected. Precautions must be taken to avoid physical damage and
contamination which may prevent proper start-up and may result in costly
repair or equipment failure.
Units should be transported and stored in an upright manner at all times
and should not be stacked. The HydroBox indoor unit cannot be stored
outside and should be protected from the elements during shipping. Excess
moisture can damage the electronics in the unit.
1.2 Legal Regulations and Directives
The heat pump is designed for use in a domestic environment according to
Article 1, Paragraph 2 k) of EC directive 2006/42/EC (machinery directive)
and is thus subject to the requirements of EU directive 2014/35/EU (low-
voltage directive). It is thus also intended for use by non-professionals for
heating shops, ofces and other similar working environments, agricultural
establishments and hotels, guesthouses and other residential buildings.
The construction and design of the heat pump complies with all relevant
EU and North American directives, including DIN, VDE, UL, FCC, and CSA
regulations.
When connecting the heat pump to the power supply, the relevant VDE, EN,
IEC, UL and CSA standards are to be adhered to. Any further connection
requirements stipulated by local utility companies or codes must also be
observed.
When connecting the heating system or cooling system, all country-specic
and local regulations must also be adhered to.
This unit can be used by children aged 8 and over and by persons with
limited physical, sensory or mental aptitude or lack of experience and/or
knowledge, providing they are supervised or have been instructed in the
safe use of the unit and understand the associated potential dangers.
Children must not play with the device. Cleaning and user maintenance
must not be carried out by children without supervision.
Warning! This heat pump system must be installed by a licensed
plumber, electrician, and/or professional service technician.
Improper installation and/or operation can cause a potentially
hazardous situation, which, if not avoided, could result in serious
injury or death, and will void the warranty.
Note: When operating or maintaining a heat pump, the legal
requirements of the state or country where the heat pump is operated
apply. Depending on the refrigerant ll quantity, the heat pump may have
to be inspected for leaks at regular intervals by a certied technician, and
these inspections must be recorded.
Note: No one but a professional service technician should attempt
to install, service, or repair this heat pump system. There are no
serviceable parts which can be changed by the user / owner. User /
owner should contact the original professional service technician if the
heat pump system needs repair or maintenance.
Note: When servicing the equipment, be sure to disconnect electrical
power before removing any of the panels from either the HydroBox indoor
unit or Heat Pump outdoor unit. There may be multiple disconnects for
each unit. Label all wires while performing service to ensure proper
re-wiring of the units. Wiring errors can cause improper or dangerous
operation. Failure to do so could result in an electrical shock, improper
heat pump operation, property damage, serious personal injury, or death.
Note: Do not use petroleum-based cleaning or sealing compounds in a
heat pump system. Gaskets and seals in the system could be damaged.
This could result in substantial property damage.
Note: Chemical imbalance of the water supply may effect efciency and
cause severe damage to the heat pump and associated equipment.
Water quality must be professionally analyzed to determine whether it
is necessary to adjust water quality. The water must be potable, free
of corrosive chemicals, sand, dirt, and other contaminates so as not to
damage the heat exchanger. Potable water is dened as drinkable water
supplied from a utility or well water in compliance with EPA secondary
maximum contaminant levels (40 CFR 143.3). Failure of the equipment
due to lime scale build-up or other chemical imbalance is not covered by
the warranty.
Note: Because water lines run between the HydroBox indoor unit and
Heat Pump outdoor unit, proper freeze protection may be required
depending on climate. Never use any toxic chemical, including
automotive, standard glycol antifreeze, or ethylene glycol made for
hydronic (non-potable) systems. These chemicals can attack gaskets
and seals in water systems, are poisonous if consumed, and can cause
personal injury.

4
2. Intended Use of the System M Heat Pump
2.1 Area of Application 2.2 Operating Principle
The air-to-water heat pump is to be used exclusively for heating or cooling of
HVAC system distribution water and indirect domestic hot water production.
It can be used in new or existing home comfort (HVAC) systems.
The heat pump is suitable for mono energy and bivalent operation in outside
air temperatures down to -7 °F (-22 °C).
Mono energy operation
The heat pump alone supplies a large part of the required heat output. On
the few days during the year with extremely low outdoor temperatures (<
20 °F, -7 °C), the supplied buffer tank immersion heater can supplement
the heat pump. Both heat generators are operated with one type of
energy (electricity), e.g. mono energy. This operating mode is a sensible
choice if air serves as the heat distribution source, since raising the
number of hours per year during which the heat pump is operated to its
full potential does not require changes to the heat distribution system.
Experience has shown that in air-to-water heat pump heating systems,
more than 95% of the annual energy demand can be provided by the
heat pump alone.
Bivalent operation
The heat pump alone covers most of the heat consumption. In the event
of very low outdoor temperatures, the heat pump is supplemented by a
second heat generator, e.g. fossil-fuel red boiler. This operating mode
is mainly used when old buildings are renovated and the existing boiler
is to be kept in use.
Proper defrosting of the heat pump evaporator is guaranteed by maintaining
a heating water return temperature from the heat pump to the HydroBox of
more than 68 °F (20 °C) during continuous operation.
It is not designed for the increased heat consumption required when a
building is being dried out. For this reason, the additional heat consumption
should be met using special devices provided by the customer.
In cooling operation, the heat pump is suitable for air temperatures ranging
from 55 °F to 113 °F (+12.8 °C to + 45 °C). It can be used for dynamic (fan
assisted) cooling. The minimum water temperature is 45 °F (+7 °C).
Heating
Surrounding air is drawn in by the heat pump's fan and fed through the
evaporator (heat exchanger). The evaporator cools the air, i.e. extracts
heat from it. This extracted heat is then transferred to the working medium
(refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increasing its pressure
with the aid of the electrically driven compressors. It is then transferred to
the heating water via the liqueer (heat exchanger).
Electrical energy is used to raise the temperature level of the heat from the
environment. Because the energy extracted from the air is transferred to
the heating water, this type of device is referred to as an air-to-water heat
pump.
The heated water is transferred to the indoor unit's buffer tank by the
integrated variable speed heat pump circulating pump (M16). The buffer
tank provides storage volume for supply out to the HVAC system.
The main components of the air-to-water heat pump consists of the
evaporator, fan and expansion valve, as well as the compressors, the
liqueer and the electrical control system. (See Fig 1)
At low ambient temperatures, humidity accumulates on the evaporator
in the form of frost, reducing the transfer of heat. Uneven accumulation
during this process does not indicate a fault. The evaporator is defrosted
automatically by the heat pump as required. Under certain atmospheric
conditions, steam may be emitted from the air outlet.
Cooling
The functions of the evaporator and the liqueer are reversed in the
"Cooling" operating mode.
The heating water transfers its heat to the refrigerant via the liqueer,
which is now functioning as an evaporator. The refrigerant is brought to a
higher temperature level using the compressor. Heat is transferred to the
surrounding air via the liqueer (which, in heating operation, functions as
an evaporator).
The chilled water is transferred to the indoor unit's buffer tank by the
integrated variable speed heat pump circulating pump (M16). The buffer
tank provides storage volume for supply out to the HVAC system.
Domestic Hot Water
Heated water is also transferred, when required, from the heat pump directly
to the indirect domestic hot water (DHW) tank by the integrated variable
speed DHW tank circulating pump (M18), bypassing the buffer tank.
This direct supply provides for a quicker response when domestic hot water
is required and quicker return to cooling once the DHW call is completed, as
the buffer tank can remain full of chilled water. Domestic hot water always
has priority.

5
1. Shut-off Valves
2. Heat Pump Circulating Pump (M16)
3. DHW Tank Circulating Pump (M18)
4. Wiring Hub (knock-outs in rear of HydroBox)
4a. Low Voltage Connections
4b. Line Voltage Connections
5. Expansion Tank
6. Air Separator
7. Pressure Relief Valve
8. Hy-Vent
9. Buffer Tank
10. Drip Pan with Drain
11. Touch Screen Display
12. Heat Pump Manager Controller (SCU-1)
Get drawing showing the flow pattern through the piping –
Something that ric mayo did I believe.
With direction check valves indicated
2
3. Scope of Supply
3.1 Basic Heat Pump Components 3.2 Basic HydroBox Components
3.3 HydroBox
1) Evaporator (Air heat exchanger)
2) Fan (Water heat exchanger)
3) Switch box
4) Compressor
5) Liqueer (Water heat exchanger)
6) Accumulator
The HydroBox and integrated heat pump manager controller (SCU-1) must
be used to operate the air-to-water Heat Pump outdoor unit.
The heat pump manager is a convenient electronic regulation and control
device. It controls and monitors the entire heating and cooling system based
on the outdoor temperature, as well as domestic hot water preparation and
safety systems. All functions and programming can be accessed by the
touch screen user interface on the front panel of the HydroBox or carried
out using a smart device or smartphone paired with the unit.
ed.xelpmidnelg.www7000DF·40.66.9612544
EnglishAir-/Water-Chiller-Heatpump
3 Scope of supply
3.1 Basic device
1) Evaporator
2) Fan
3) Switch box
4) Compressor
5) Liquefier
3.2 Chiller-heat pump manager
The chiller-heat pump manager included in the scope of supply
must be used to operate the (reversible) air-/water-chiller-heat
pump.
The chiller-heat pump manager is a convenient electronic reg-
ulation and control device. It controls and monitors the entire
heating system based on the outdoor temperature or room
temperature, as well as domestic hot water preparation and
safety systems.
The sensor for outside temperature to be mounted on-site incl.
fixing materials is included with the chiller-heat pump and
chiller-heat pump managerunit.
The functions and usage of the chiller-heat pump manager are
described in the operating instructions supplied.
1
2
4
3
5
6
Fig. 1
Fig. 2
1. Shut-off Valves
2. Heat Pump Circulating Pump (M16)
3. DHW Tank Circulating Pump (M18)
4. Wiring Hub (knock-outs in rear of HydroBox)
4a. Low Voltage Connections
4b. Line Voltage Connections
5. Expansion Tank
6. Air Separator
7. Pressure Relief Valve
8. Hy-Vent
9. Buffer Tank
10. Drip Pan with Drain
11. Touch Screen Display
12. Heat Pump Manager Controller (SCU-1)
Get drawing showing the flow pattern through the piping –
Something that ric mayo did I believe.
With direction check valves indicated
2
1) Shut-off Valves
2) Heat Pump Circulating Pump (M16)
3) DHW Tank Circulating Pump (M18)
4) Wiring Hub (knock-outs in rear of HydroBox)
4a) Line Voltage Connections
4b) Low Voltage Connections
5) Expansion Tank
6) Air Separator
7) Pressure Relief Valve
8) Hy-Vent
9) Buffer Tank
10) Drip Pan with Drain
11) Touch Screen Display
12) Heat Pump Manager Controller (SCU-1)
1
2
3
4
10
5
11
12
6
7
8
9
4a
4b

6
1. 3.
2.
4. Transport and Access
4.1 Heat Pump
4.2 HydroBox
A pallet should be used to transport the heat pump to its nal installation
location. The basic device can be transported with a lift truck, hand truck
or by means of 3/4" pipes fed through the holes in the baseplate or frame.
Before using the transport holes in the frame, it is necessary to remove the
side sections. To do this, loosen the two screws at the top, tilt the metal
plate to the side and remove at the top (see Fig 3 steps 1-3)
Once the side sections have been removed, the outdoor unit can be lifted
by the cover. To do this, loosen the two screws at the top, tilt the metal plate
to the side and remove at the top (see Fig 3 steps 1-3)
Be careful not to damage any components or cables when inserting the
pipes through the frame.
See Section 5.1 for recommended clearances for installation and
maintenance.
Important: After the nal positioning at the installation location, remove the
transport fastening on the sprung oor of the compressor on both sides.
Remove the two screws in the middle location on both sides. Do not
remove or alter the location of the nuts or screws at the four corners of the
sprung oor. (See Fig. 4)
A pallet is supplied to ease transport of the HydroBox to its nal installation
location. The basic device can be transported with a lift truck or hand truck.
Access to the line and low voltage wiring hub is achieved by removing just
the left side panel. To do this, loosen the six screws, pull the panel out about
1" and then lift straight up to disengage the L brackets from the frame with
the help of the hand grips. (See g. 5, steps 1-3)
The condensate drain line is installed through the hole in the bottom of the
right panel. The connection is 1/2" NPT. The right panel does not need to be
remove for initial installation but if access to the right side is needed to ease
access during service, the condensate drain line needs to be disconnected
before removing the panel. The front and rear panels do not need to be
removed for installation. See Section 5.3 for recommended clearances for
installation and maintanence.
Caution: The outdoor unit with refrigeration circuit must not be
tilted more than 45° (in any direction).
Caution: Before commissioning, the transport fastening must be
removed.
www.glendimplex.de 452169.66.04 · FD 0007 5
Air-/Water-Chiller-Heatpump English
4 Transport
4.1 Monoblock
A pallet should be used to transport the chiller-heat pump to its
final installation location. The basic device can be transported
with a lift truck, hand truck or by means of 3/4" pipes fed
through the holes in the baseplate or frame.
!!
CAUTION!
The outdoor unit with refrigeration circuit must not be tilted
more than 45° (in any direction).
Once the side sections have been removed, the outdoor unit
can be lifted by the cover. To do this, loosen the two screws at
the top, tilt the metal plate to the side and remove at the top
(see steps 1-3)
Before using the transport holes in the frame, it is necessary to
remove the side sections. To do this, loosen the two screws at
the top, tilt the metal plate to the side and remove at the top
(see steps 1-3)
Be careful not to damage any components or cables when in-
serting the pipes through the frame.
After the final positioning at the installation location, remove
the transport fastening on the sprung floor of the compressor
on both sides.
!!
CAUTION!
Before commissioning, the transport fastening must be re-
moved.
1.
2.
3.
1.
www.glendimplex.de 452169.66.04 · FD 0007 5
Air-/Water-Chiller-Heatpump English
4 Transport
4.1 Monoblock
A pallet should be used to transport the chiller-heat pump to its
final installation location. The basic device can be transported
with a lift truck, hand truck or by means of 3/4" pipes fed
through the holes in the baseplate or frame.
!!
CAUTION!
The outdoor unit with refrigeration circuit must not be tilted
more than 45° (in any direction).
Once the side sections have been removed, the outdoor unit
can be lifted by the cover. To do this, loosen the two screws at
the top, tilt the metal plate to the side and remove at the top
(see steps 1-3)
Before using the transport holes in the frame, it is necessary to
remove the side sections. To do this, loosen the two screws at
the top, tilt the metal plate to the side and remove at the top
(see steps 1-3)
Be careful not to damage any components or cables when in-
serting the pipes through the frame.
After the final positioning at the installation location, remove
the transport fastening on the sprung floor of the compressor
on both sides.
!!
CAUTION!
Before commissioning, the transport fastening must be re-
moved.
1.
2.
3.
1.
Fig. 3
Fig. 4
Fig. 5

7
5. Installation
5.1 General - Heat Pump
5.2 Acoustic emissions
5.3 General - HydroBox
The Heat Pump outdoor unit must be installed on a permanently even,
smooth and horizontal surface (concrete slab). The base should be sized so
the entire outdoor unit is directly supported. The recommended minimum
concrete slab dimensions are 42" long x 32" wide x 6" deep (107 x 32
x 15.25 cm) for mounting hardware clearances. To prevent small animals
from entering the inside of the device, the connection holes in the base
plate should be sealed where necessary.
The outdoor unit is designed for installation close to walls on even ground,
and must always be xed in place at the installation site (see dimension
drawing, Section 12). The heat pump prole is tall and slender, so it must
be attached permanently to the base for safety reasons. The responsibility
for the heat pump installation lies with the specialist system construction
company. During the installation, local requirements such as building
regulations, siesmic considerations, the static load of the building, and wind
exposure must be accounted for.
If the unit will see a condition where snow levels exceed 15 inches (.5
meters) it is recommended that a snow stand be used to elevate the heat
pump. The snow stand must be permanently attached to the base and the
heat pump secured to the stand for safety reasons.
If there is risk of snow or ice falling from a roof, a protective roof or cover
must be constructed to protect the heat pump, pipes, and wiring.
It must be possible to carry out maintenance work without hindrance. This is
ensured if the clearances displayed below are maintained.
The heat pump operates silently due to efcient sound insulation. Internal
insulation measures should be carried out to prevent vibrations from being
transmitted to the foundation or to the heating system.
The placement of the unit must be indoors. The HydroBox is not designed
for outdoor or wet environments. It is recommended that the unit be placed
near where the interconnected piping to the outdoor unit enters the building
to keep the piping distance to a minimum. A maximum of 100 feet of 1" pipe
can be used between the indoor and outdoor unit. For longer distances 1
1/4" pipe can be used. However, a resistance head calculation should be
performed based on the supplied Taco 0034e circulating pump to maintain
the target 8gpm ow rate with the chosen pipe size and pipe.
All electrical connections can be accessed by removing the left side panel
of the HydroBox. Although all panels can be removed, the HydroBox was
designed to be able to access all serviceable components and access all
wiring connections by just removing the side panels.
It must be possible to carry out maintenance work without hindrance. This
is ensured if the clearance displayed below is maintained.
The specied dimensions are valid for single unit installation only. (See Fig.
6)
If multiple outdoor units are set up next to each other, the required minimum
distance at the side adds up. Ensure that the cold expelled air is not sucked
in again.
Note: The cold air is blown out downwards at the side of the heat pump
and can result in black ice on paths and platforms.
1.3 ft
(0,4 m)
Back of Unit
1.6 ft
(0,5 m)
1.6 ft
(0,5 m)
3.3 ft
(1 m)
Air Flow
Note: Do not restrict or block the area around the intake or the air outlet
area.
Note: Observe all local building regulations!
Note: The physical impacts must be observed for installation close to
walls. No windows or doors should be present in the area surrounding
the air outlet of the fan.
Note: In cases of installation close to walls, there may be more sediment
in the intake and air outlet area due to the air ow. The colder outside air
outlet should discharge in such a way as to not increase the heat losses
in heated neighboring rooms.
Note: Installation in a hollow or in an inner courtyard is not permitted
because cooled air collects at ground level and is drawn in again by the
heat pump during extended periods of operation.
Note: Do not locate where the air intake is near vented appliances (e.g.
driers, furnaces, replaces), moisture producing equipment, vehicle
exhaust, subject to direct salty atmospheres, where metal, powder like
substances or chemicals are in the air that could effect the unit (include
livestock breading areas and hot springs).
Fig. 6
Fig. 7
FORMATREV 9-1-17
THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL
AND PROPRIETARY TO TACO, INC. (“TACO”). IT IS PROVIDED FOR USE
ONLY FOR THE PURPOSES EXPRESSLY STATED BY TACO. BY USING
THIS DOCUMENT, YOU AGREE THAT TACO WILL HAVE NO LIABILITY
FOR ANY DAMAGES ARISING OUT OF YOUR USE OR MODIFICATION TO
IT AND YOU AGREE TO RETURN THE DOCUMENT, TOGETHER WITH
ALL COPIES MADE, IMMEDIATELY WHEN REQUESTED BY TACO.
APP
QA
INCHES [MM]
07/16/2020
aco
Inc.
6
OF
SHEET
UNLESS OTHERWISE SPECIFIED:
ANGLES ± 1°
FEATURE
CONTROL
SYMBOLS PER
ANSI Y14.5
R.005[.127]TO.015[.38]
BREAK SHARP EDGES
125
FINISHES
FRACTIONS±1/64[.397]
.XX ± .02[.508]
.XXX ± .005[.127]
.XXXX ± .0005[.0127]
ECO/Submittal
SCALE
VOL
DATE
APP
ENG
APP
MFG
DR
BY
PRELIMINARY
REV
D 1
SIZE
CRANSTON, R.I.
3A
Outdoor
Heat
Pump
HydroBox
(0.5 m)
(0.5 m)
(0.4 m)

8
6. Assembly / Connection
6.1 Installing the Electrical Wires
6.2 Condensate Drain
6.3 Connection Between the Indoor and Outdoor Unit
The electrical wires used to connect the HydroBox indoor unit to the Heat
Pump outdoor unit must be provided on site. Instructions on connection,
wire recommendations, etc. are provided in the electrical documentation,
section 6.6 and include 120 line voltage and a twisted pair, shielded
communications wire.
To route the connection wires, create wall openings at suitable points. The
wall opening must be protected from water penetration according to the
local conditions. The wall openings should be sealed again correctly once
the routing work is complete.
The Heat Pump outdoor unit produces condensate in the heating months
when in a defrost cycle and must be routed away from unit for proper
operation. To ensure proper drainage, the heat pump must be mounted on
a level surface (gure 8).
If another method is used to route condensate away from unit, then it needs
to be protected from freezing or damage to the heat pump could result.
Do not discharge the condensate directly into clearing tanks or cess pits.
The aggressive vapours and a condensate pipe laid in an area which is not
frost-free can destroy the evaporator.
1. Supply Connection to HydroBox (1 1/4" NPT)
2. Return Connection from HydroBox (1 1/4" NPT)
3. Feedthrough for Condensate Hose
4. Feedthrough for Electrical & Communications Lines
5. Optional Knockouts for Side Electrical Connections
The supply and return piping between the heat pump and the HydroBox
should be a minimum of 1 inch in diameter with a maximum of 1 1/4 inch
and insulated from the elements. This supply and return piping may be
installed underground into the bottom of unit as shown in gure 9 & 10 or
above ground through knockouts on side of base. The insulation needs to
be protected from the elements, so it does not to degrade.
6”
Crushed Stone
Condensate Drain
Outdoor Unit
Power and Communications
Insulated Supply
& Return Piping
Air
Flow
(Back of Unit)
2 1 4 3
22.3”
19.8”
8.3”
4.3”
34.1”
32.7”
7.9”
2.2”
4 X 0.67” Holes for Mounting
Fig 4: Supply & Return Connections
(End View)
1
2
5
66.9”
Weight: 386 lbs
23.6”
33.5”
Water Quality
Before connecting the heating water system to the HydroBox and heat
pump, the heating system must be ushed to remove any impurities,
residue from sealants, etc. Any accumulation of deposits in the liqueer
may cause the heat pump to break down.
Fig. 8
Fig. 9: Bottom Dimensions
(Top View)
Fig. 10: Supply & Return Connections
(Side View)
HydroBox Piping Connections
Fig. 11

9
Once the HydroBox and heat pump has been connected to the heating
system, it must be lled, purged and pressure-tested.
The following points must be observed when lling the system:
• Untreated lling water and make-up water must be of drinking water
quality (colorless, clear, free of sediments)
• Filling water and make-up water must be ltered (max. pore size 5
µm).
Scale formation in domestic hot water heating systems cannot be avoided,
but in systems with ow temperatures below 140°F (60°C), the problem
can be disregarded. With high-temperature bivalent systems (heat pump
+ boiler combination), ow temperatures of 140°F (60°C) and more can be
achieved. The following standard values should therefore be adhered to
with regard to the lling and make-up water according to EPA 40 CFR 143.3
or VDI 2035, sheet 1: The total hardness values can be found in the table.
Minimum Heating Water Flow Rate
The minimum heating water ow rate through the heat pump is maintained
by the integrated variable speed heat pump circulating pump (M16) and
ensures proper ow across all operating states of the heat pump system. If
the minimum heating water ow rate is not reached, the heat pump will go
into a blocked status.
The specied nominal ow rate (see “Device information”) must be assured
in all operating statuses. The installed ow rate monitoring is used only for
switching off the heat pump in the event of an unusual and abrupt drop in
the heating water ow rate and not to monitor and safeguard the nominal
ow rate.
A method of manual drainage should be provided for heat pumps which
are exposed to freezing temperatures or the system piping needs to be
lled with an appropriate percent mixture of a propylene glycol antifreeze
suitable for hydronic system use and based on the minimum outdoor
design temperature. The freeze protection function is automatically
enabled whenever there is power at the HydroBox to make sure there is
ow through the heat pump outdoor unit at low temperatures. The system
HVAC System Connection
There are six 1" female NPT connections extending from the top of the
HydroBox. If looking from the front of the HydroBox, going left to right,
the rst two are the supply and return for the indirect domestic hot water
tank (DHW). The middle two are the supply and return to the house's
HVAC distribution system (Heating / Cooling Circuit or HCC). The right
two connections are the supply and return to the Heat Pump outdoor unit.
Note that the heat pump circulator (M16) is on the return side of the heat
pump (pumping through the heat pump) and the hot or chilled water coming
from the heat pump enters the indoor unit through the heat pump supply
connection (see g. 11). When making connections to the HydroBox make
sure to use a backwrench at the top outlet connections so as to not bend or
twist the piping manifold.
HydroBox Components
The HydroBox includes two Taco 0034e high efciency ECM variable speed
circulators which control the ow between the HydroBox and domestic hot
water tank respectfully. Each of the circulators is controlled via a 0-10 VDC
signal and their operation is controlled and optimized by the on-board heat
pump manager. The Hydrobox includes a 30 gallon buffer tank for thermal
storage and additional thermal mass when used on an air based distribution
system with an integrated 6KW immersion heater for temperature boost
during low outdoor temperature operation. The HydroBox has shut-off
valves to isolate the pumps and individual circuits, a 2.1 gallon expansion
tank, and a 30psi relief valve and backow combination valve piped to a
drain pan. The drain pan has a 1/2" NPT connection which should be piped
to a oor drain or other means of water collection/dispersement as required
by code. A Taco 4900 Air Separator is internal to the piping and a Taco Hy-
Vent is connected at the top of the buffer tank. Both provide secondary air
elimination within the HydroBox. Both vents are shipped closed and should
not be relied upon for main purging of the distribution system. Additional
vents should be located at the high points of the system. The entire piping is
fully insulated to reduce condensate accumulation during cooling operation.
(see g. 2)
The HydroBox is a complete turn-key system able to provide either heated
of chilled water out to the HVAC distribution system and hot water to an
indirect DHW tank. The necessary system distribution equipment (e.g.
pumps, valves, heating/cooling emitters) and the associated controls and
required safety devices are supplied by the installing contractor.
Abb. 6.1:Guideline values for lling and make-up water in accordance with VDI 2035
For systems with an above-average specic system volume of 50 l/kW, VDI
2035 recommends the use of fully demineralized water and a pH stabilizer
to minimize the risk of corrosion in the heat pump and heating system.
1. This value lies outside the permissible value for heat exchangers in heat pumps.
Caution: With fully demineralized water, it is important to ensure
that the minimum pH value of 7.5 (minimum permissible value
for copper) is complied with. Failure to comply with this value can
result in the heat pump being destroyed.
Heating / Cooling Circuit (HCC) Piping / Connection
There are no special requirements for piping the heating / cooling circuit
(HCC). Heated or chilled water will be supplied to the “System Supply”
outlet connection at the top of the HydroBox and once distributed to the
system’s terminal output units (radiant oors, radiators, fan coils, etc.) it
will return to the HydroBox at the “System Return” piping inlet connection.
The distribution system can be completely independent of the System M
indoor and outdoor unit control or an optional Heating / Cooling Circuit (HCC)
pump (M13) can be controlled using a 0-10vDC signal from the HydroBox’s
wiring hub. It is recommended that this option be used when a domestic hot
water indirect tank is part of the overall system design. Operating the HCC
pump in a variable speed manner also maximizes system operation and
operational efciency. Proper sizing of the HCC pump is up to the installing
contractor based on the distribution design and head/ow requirements.
However, we recommend the use of an ECM-driven pump and it must be
able to accept a 0-10vDC signal from the HydroBox. Line voltage power to
the pump is eld supplied.
Total
heat output
in kW
Total
Alkaline earths in
mol/m3
and/or mmol
Specic system volume
(VDI 2035) inl/kW
< 20 > 20 < 50 > 50
Total hardness in °dH
< 50 < 2.0 <16.8 <11.2
< 0.111
50 - 200 <2.0 <11.2 <8.4
200 - 600 <1.5 <8.4
< 0.111
> 600 < 0.02 < 0.111
% Propylene
Glycol Solution 10% 15% 20% 25% 30% 35% 40%
Burst Protection
Temperature°F/°C
22°F /
-6°C
15°F /
-9°C
11°F /
-12°C
-1°F /
-18°C
-18°F /
-28°C
-46°F /
-43°C
-60°F /
-51°C
Multiplier for
Pressure Drop 1.02 1.04 1.08 1.13 1.21 1.26 1.47
Multiplier for
Capacity Factor 0.994 0.992 0.986 0.972 0.960 0.950 0.928
must be protected or drained if the heat pump is taken out of service or in
the event of a power failure. The heating circuit should be operated with a
suitable freeze protection method if heat pump systems are implemented
in buildings where a power failure cannot be detected (holiday home). See
Note 4 under section 11 to see capacity impacts for different antifreeze
mixture percentages. Because of the heat transfer penalties of using glycol
in the system we recommend selecting the proper concentration based on
the burst rating. Follow the glycol manufacturer's recommendations for
maintenance and testing, which is usually yearly, to maintain the correct pH
of the system uid.
Freeze Protection

10
Fig. 12A System M - Heating, Cooling, & DHW; Typical Application Mechancial Drawing

11
Fig. 13A
System M - Heating, Cooling, & DHW; Typical Application
Electrical Drawing

12
Fig. 12B System M with Boiler Back-Up; Either Heat Pump Only or Boiler Only (Central heating boiler back-up, not DHW) Mechanical Drawing

13
Fig. 13B
System M with Boiler Back-Up; Either Heat Pump Only or Boiler Only
(Central heating boiler back-up, not DHW)
Electrical Drawing

14
Fig. 12C System M with Boiler Back-Up; Either Heat Pump Only or Boiler Only (Central heating & DHW boiler back-up) Mechanical Drawing

15
Fig. 13C System M with Boiler Back-Up; Either Heat Pump Only or Boiler Only (Central heating & DHW boiler back-up) Electrical Drawing

16
6.4 Domestic Hot Water Connection
Installation and commissioning must be performed by a licensed plumbing,
heating & cooling (HVAC) company. The entire system, including all factory-
assembled components, should be inspected to ensure that everything is
working properly and that there is no leakage.
The following materials can be used in the HVAC system circuit or the
domestic hot water circuit as allow by local code:
• Copper
• Stainless steel
• Brass
• Plastic (e.g. PEX Tubing)
Depending on the materials used in the domestic hot water system (customer
installation), material incompatibility may lead to corrosion damage.
This especially applies to zinc-plated materials and materials containing
aluminum. If there is a risk of water contamination during operation, install
a suitable lter.
The maximum permissible operating overpressure indicated on the type
plate must not be exceeded. It may be necessary to mount a pressure
reducer.
Ensure that the water supply is turned on and the tank is lled before start-
up.
The domestic hot water tank must be equipped with a certied, spring-
loaded membrane safety valve on-site. A shut-off device must not be
installed between the tank and the safety valve. The operational reliability
of the valve must be checked at regular intervals. We recommend having
an annual service inspection carried out by a qualied and licensed HVAC
company.
The System M is designed to seamlessly integrate with our 85 gallon
indirect hot water tank (SMT85-1). It features a customized heat exchanger
design which maximizes the heat transfer surfaces in combination with the
HydroBox's variable speed domestic hot water tank circulating pump (M18).
The 85 gallon indirect hot water tank (SMT85-1) includes an internal 4.5kw
electrical back-up immersion heater to supplement the hot water production
when required and achieve higher temperatures required for thermal
disinfection. A DHW call is activated by the supplied sensor eld-installed in
the thermal well in the SMT85-1 DHW tank. Ensure the sensor makes good
contact with the thermal well, good practice is to use a thermal paste / grease
when installing the sensor. The DHW tank maintains a set temperature as
programmed in the user interface. The DHW tank call always has priority.
Field wiring is required between the HydroBox indoor unit and the DHW tank
sensor (shipped with the System M), see section 6.6.5. Separate 120v and
240v power connections and a eld supplied contactor is also required to
activate the SMT85 DHW tank and the immersion heater, see section 6.6.1.
A domestic hot water recirculation system can be used as part of the overall
system design, such as the Taco SmartPlus-e, Hot-LinkPlus-e or TacoGenie.
These systems are installed and controlled separately from the System M.
The HydroBox heat pump manager monitors and controls the production of
domestic hot water. Multiple parameters can be adjusted through the user
interface or paired smartphone app including target temperatures, speed of
production, hysteresis, grid / utility signal connections, post purge timers,
setbacks, and thermal disinfection schedules.
If using the thermal disinfection function, make sure the indirect hot water
tank's aquastat setting is set appropriately so when the thermal disinfection
function is activated a high enough tank temperature can be reached. It is
also code in most locations to install a mixing valve at the outlet of the hot
water tank to prevent scalding - check all local codes before installation.
Important: If another indirect hot water tank is used the tank should have a
minimum of 3.3m2 of surface transfer area and work with the head and ow
specications of the supplied hot water tank circulating pump (M18), which
is a Taco 0034e.
6.5.1 Sensor Characteristic Curves
The temperature sensors to be connected to the heat pump manager must
correspond to the values specied in the table.
Temperature
in °F (°C)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
NTC-2 in kΩ 14.6 11.4 8.9 7.1 5.6 4.5 3.7
NTC-10 in kΩ 67.7 53.4 42.3 33.9 27.3 22.1 18.0
PT 1000 in kΩ 0.92 0.94 0.96 0.98 1.0 1.02 1.04
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
113
(45)
122
(50)
131
(55)
140
(60)
2.9 2.4 2.0 1.7 1.4 1.1 1.0 0.8 0.7 0.6
14.9 12.1 10.0 8.4 7.0 5.9 5.0 4.2 3.6 3.1
1.06 1.08 1.1 1.12 1.14 1.16 1.18 1.2 1.22 1.24
6.5 Temperature Sensor Connection
The following temperature sensors must be mounted:
• Outdoor temperature (R1) is (NTC-2)
• DHW tank sensor (R3) is (NTC-10). 20ft (6m) cable supplied,
may be extended.
The following temperature sensors are factory installed:
• Return temperature (R2) (NTC-10)
• Return line demand sensor (R2.2) (NTC-10)
• Flow rate monitoring with ow sensor (R3.1) (PT1000)

17
6.5.2 Mounting the Outside Temperature Sensor
Note: The temperature sensor (thermistor) is built into the enclosure.
• Take the sensor cover off by unscrewing both screws on the front
cover.
• Use the included screws to attach the base of the sensor to the wall.
• The sensor is wall mounted and the wiring enters through the bottom
of the enclosure. The hole for the cable entry must face downward in
order to prevent water from entering and lling the enclosure.
• The temperature sensor must be mounted in such a way that all
weather conditions are taken into consideration and the measured
value is not falsied.
• Mount on the external wall on the north or north-west side
where possible
• Do not install in a "sheltered position" (e.g. in a wall niche or
under a balcony)
• Not in the vicinity of windows, doors, exhaust air vents,
external lighting or heat pumps
• Not to be exposed to direct sunlight at any time of year
• Above the snow line
• The sensor should be installed at an elevation above the ground that
will prevent accidental damage or tampering.
• Mount the outdoor sensor, loosen the bottom nut, then push the
thermostat/sensor wire through nut and the into each of the terminal
blocks, tighten them down with the screws. Re-tighten the nut. Run
the wiring back to the HydroBox wiring hub, terminals numbers 4 and
5. The connections are not polarity sensitive, so either wire can go to
either terminal.
Outdoor Temperature and DHW Sensor Design Parameters
Conductor size / material 18 gauge, copper
Max. cable length 165 feet (50 m)
Ambient temperature 95°F (35°C)
FORMAT REV 9-1-17
THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL
AND PROPRIETARY TO TACO, INC. (“TACO”). IT IS PROVIDED FOR USE
ONLY FOR THE PURPOSES EXPRESSLY STATED BY TACO. BY USING
THIS DOCUMENT, YOU AGREE THAT TACO WILL HAVE NO LIABILITY
FOR ANY DAMAGES ARISING OUT OF YOUR USE OR MODIFICATION TO
IT AND YOU AGREE TO RETURN THE DOCUMENT, TOGETHER WITH
ALL COPIES MADE, IMMEDIATELY WHEN REQUESTED BY TACO.
APP
QA
INCHES [MM]
07/16/2020
aco
Inc.
10
10
OF
SHEET
JJK
UNLESS OTHERWISE SPECIFIED:
ANGLES ± 1°
FEATURE
CONTROL
SYMBOLS PER
ANSI Y14.5
R.005[.127]TO.015[.38]
BREAK SHARP EDGES
125
FINISHES
FRACTIONS±1/64[.397]
.XX ± .02[.508]
.XXX ± .005[.127]
.XXXX ± .0005[.0127]
ECO/Submittal
SCALE
1:4
CI
VOL
DATE
APP
ENG
APP
MFG
DR
BY
PRELIMINARY
REV
D
1
SIZE
CRANSTON, R.I.
Fig. 14

18
6.6 Electrical Connection
6.6.1 Electrical Diagrams
M16
BUFFER
TANK
J9
U4 U1 U7
NO7
X1.1
UHI
1 2 3 4 5 6 7 8 9
10 11 12 13
1 2 3 4 5 6 7 8 9
10 11 12
1 2
240 VAC 26A INPUT
ETHERNET
DHW SENSOR (R3)
OUTDOOR SENSOR (R1)
FORCED COOLING
CHANGE-OVER
0-10 VDC SIGNAL
0-10 VDC SIGNAL
HEAT PUMP
CIRCULATING
PUMP (M16)
SCU-1
HEAT PUMP
MANAGER
TERMINAL BLOCK 1: LOW VOLTAGE TERMINAL BLOCK 2: LINE VOLTAGE
HEATING/
COOLING CIRCUIT
CIRCULATION PUMP
(M13) OPTIONAL
0-10 VDC SIGNAL
2 1
L N G
X1
IMMERSION
HEATER
NO3
N
L
G
N N N
L L L
G G
240V G
DHW
TANK
IMMERSION
HEATER
DOMESTIC HOT
WATER TANK
(OPTIONAL)
Y3
120 VAC 1A OUTPUT
TWISTED PAIR, SHIELDED WIRE
(SEE NOTE B)
HEAT PUMP
OUTDOOR
UNIT
120 VAC 9A INPUT
(SEE NOTE A)
240 VAC 26A INPUT
PE
L2 L1
Y1
R W Y G C
AIR HANDLER
NC
NO
C
R W Y G C
THERMOSTAT
120 VAC
24VAC RELAY
NOTES
IMPORTANT!
120 VAC POWER SUPPLIED TO THE HYDROBOX AND THE HEAT PUMP MUST
A.
BE RUN IN PARALLEL AND SUPPLIED FROM THE SAME DEDICATED CIRCUIT. THIS SIMULTANEOUSLY TURNS ON BOTH UNITS, ENSURING COMMUNICATIONS SYNCHING
BETWEEN THE TWO UNIT’S CONTROLLERS.
HEAT PUMP MODBUS COMMUNICATION CABLE TO BE 24 AWG SHIELDED TWISTED PAIR.
B.
THE RECOMMENDED CABLE IS BELDEN 8332. THE CABLE SHIELD MUST BE GROUNDED
AT EACH TERMINATION. .
CLIP-ON FERRITE TO BE FIELD INSTALLED ON LINE AND NEUTRAL LEADS OF THE 120V
C.
POWER INPUT TO THE HYDROBOX, INCLUDED IN ACCESSORY BAG WITH THE
HYDROBOX INDOOR UNIT.
SOLID FERRITE PART F60.01 TO BE FIELD INSTALLED WITH 2 WRAPS ON L1 AND L2 LEADS
D.
OF THE 240V POWER INPUT TO THE HEAT PUMP OUTDOOR UNIT, INCLUDED IN ACCESSORY BAG WITH THE HEAT PUMP OUTDOOR UNIT. CLIP-ON FERRITE PART F60.02 TO BE FIELD INSTALLED WITH ON LINE AND NEUTRAL
E.
LEADS OF THE 120V POWER INPUT TO THE HEAT PUMP OUTDOOR UNIT, INCLUDED IN ACCESSORY BAG WITH THE HEAT PUMP OUTDOOR UNIT.
G L1 L2
GND
A (+)
B (-)
1 2 1 2 1 2 1 2 1 2
DOMESTIC HOT
WATER CIRCULATING
PUMP (M18)
1 2
M18
X2
N0
L N PE
L N GND
J11 Rx-/T- Rx+/T+ GND
DI8
L N G
L N G
L G N
Y2
N L
N
L
1 2 1 2
GND L1 L2
240 VAC 30A INPUT
FIELD SUPPLIED AND WIRED 30 AMP 2-POLE CONTACTOR W/ 120VAC COIL
L N
GND
HEATING DEMAND/SMART GRID 2
U2
RETURN LINE DEMAND SENSOR
(R2)
ROUTER-ETHERNET
TOUCH
SCREEN
DISPLAY
PWR
HDMI
USB
N28
SD CARD
Micro
SD
DI2
DI1
1 2 1 2
ETHERNET
PWR HDMI USB
GND
RX-
RX+
1 2 1 2 1 2 1 2 1 2 1 2
FERRITE SEE NOTE C
GND L2 L1
FERRITE F60.01 SEE NOTE D
FERRITE F60.02 SEE NOTE E
HYDROBOX INDOOR UNIT WIRING HUB
HYDROBOX INDOOR UNIT
FACTORY WIRING INSIDE HYDROBOX
FIELD WIRING
REV
DATE
ECO
DR
BY
APP
ENG
APP
MFG
APP
QA
2 11/1/2021
-
JJH
1 12/31/2020
-
JJK
FORMAT REV 9-1-17
THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO TACO, INC. (“TACO”). IT IS PROVIDED FOR USE ONLY FOR THE PURPOSES EXPRESSLY STATED BY TACO. BY USING THIS DOCUMENT, YOU AGREE THAT TACO WILL HAVE NO LIABILITY FOR ANY DAMAGES ARISING OUT OF YOUR USE OR MODIFICATION TO IT AND YOU AGREE TO RETURN THE DOCUMENT, TOGETHER WITH ALL COPIES MADE, IMMEDIATELY WHEN REQUESTED BY TACO.
APP QA
INCHES [MM]
06/02/2020
aco
Inc.
1
1
OF
SHEET
JJK
ELECTRICAL SCHEMATIC
SYSTEM M
UNLESS OTHERWISE SPECIFIED:
ANGLES ± 1°
FEATURE
CONTROL
SYMBOLS PER
ANSI Y14.5
R.005[.127]TO.015[.38]
BREAK SHARP EDGES
125
FINISHES
FRACTIONS±1/64[.397] .XX ± .02[.508] .XXX ± .005[.127] .XXXX ± .0005[.0127]
ECO/Submittal
SCALE
1:2
CI
VOL
DATE
APP ENG
APP MFG
DR BY
PRELIMINARY
REV
D
2
710-1059
SIZE
CRANSTON, R.I.

19
6.6.2 Electrical Connection General
All connection cables must be provided on-site. The cable type (cross-
section, conductor type, etc.) must be chosen taking into account the
relevant electrical parameters (e.g. power, current, voltage, etc.) and the
applicable VDE, EN, VNB, UL and CSA regulations. Information on this
can be found in the device information (see section 10) and the rough-in
electrical documentation (secton 6.6.2).
The supply power to the HydroBox's control circuits must have a
continuous voltage. For this reason, it should be tapped upstream from
the utility company’s blocking contactor (if installed) or be connected to the
household current, otherwise important protection functions could be lost
during a utility block (utility shutting off power to the unit during a time of
peak demand, see section 6.6.3).
Major materials needed:
Circuit breakers -
15 amp - 1 pole circuit breaker; 120 volt power supply for indoor unit and communications in outdoor unit.
30 amp - 2 pole circuit breaker; 240 volt power for 4.5kW back-up electrical immersion element in DHW tank.
35 amp - 2 pole circuit breaker; 240 volt power for 6kW back-up electrical element in indoor unit for heating.
30 amp - 2 pole circuit breaker; 240 volt power for outdoor heat pump unit.
Disconnect Switches -
Outdoor rated disconnect (2 pole); 240 volt power for outdoor heat pump unit.
Outdoor rated disconnect (1 or 2 pole); 120 volt power for outdoor heat pump unit communications.
Other –
Waterproof conduit and ttings; separate conduits for 120 volt, 240 volt and communications.
Electrical wire of proper type and size to carry load of each circuit.
Twisted pair shielded wire (or CAT6) for communications between indoor unit and outdoor unit.
Ethernet cable from router/switch to indoor unit.
30 amp - 2 pole contactor (120 volt coil) for 4.5kW back-up electrical immersion element in DHW tank.
System M Electrical Rough-in Diagram
IndoorOutdoor
120/1/60
120/1/60
Outdoor Sensor
Outdoor Unit
Indoor Unit
Indirect
Water
Heater w/
4.5kW
Electrical
Back-up
Immersion
Heater
Electrical
Disconnects
(per code)
240/1/60
L1
L2
PE
L1
L2
PE
240/1/60
L1
L2
PE
L1
L2
PE
240/1/60
L1
L2
PE
L1
L2
PE
Optional
M13
Heating/Cooling
Circuit Pump
(0-10VDC)
15 Amp
Circuit
Breaker
35 Amp
2 Pole
Circuit
Breaker
30 Amp
2 Pole
Circuit
Breaker
30 Amp
2 Pole
Circuit
Breaker
Ethernet
Cable
Power to
Back-up Electric
Immersion Heater;
Buer Tank
Power to
Control Circuits
(Indoor and Outdoor Units)
Power to Back-up
Electric DHW Tank;
Immersion Heater
Power to
Outdoor Unit
Field Wiring
Twisted Pair
Shielded Wire
120/1/60
Power to Contactor for DHW Back-Up
Power to Controller in Outdoor Unit
Optional
Heating Demand;
Smart Grid 2
(Dry Contacts)
DHW Tank
Sensor
Optional
Forced Cooling
Change-over
(Dry Contacts)
1 +VDC
2 GND
+V
+
-
-V
NO-J11
Rx+/Tx+
Rx-/Tx-
GND
Electrical Rough-in Diagrams
6.6.3 Electrical Connection for the Heat Pump
Outdoor Unit
The wires for connection to the heat pump must be provided on site.
Recommendations with regard to design, type, etc. are provided in the
electrical documentation.
The following must be connected in order to operate the heat pump:
• Supply voltage-refrigeration circuit:
240 volt, single phase, 60 hertz power off a 30 amp 2-pole circuit
breaker needs to be supplied to the X1 terminals in the Heat Pump
outdoor unit. An all-pole disconnecting device with a contact gap of
at least 3 mm (e.g. utility company’s blocking contactor or power
contactor) must be installed in the refrigeration circuit power supply.
A 1 or 2-pole circuit breaker (trip current in accordance with device
information) for the 1 or 2-phase heat pump provides the short circuit
protection, taking into account the layout of the internal wiring. The
relevant components in the heat pump contain an internal overload
protection.
• Supply voltage-communication/ control:
120 volt, single phase, 60 hertz power off a 15 amp 1-pole circuit
breaker needs to be supplied to the X2 terminals in the Heat Pump
outdoor unit. An all-pole disconnecting device with a contact gap of at
least 3mm must also be installed in the communication/control circuit
power supply.

20
6.6.4 Electrical Connection for the HydroBox Indoor
Unit – Wiring Hub
All wiring to and from the HydroBox is done at the wiring hub. To access the
wiring hub, remove the left panel, when looking at the front of the HydroBox
with the touch screen controller. There will be a separate cover that will
need to be removed to access the line voltage section of the wiring hub. All
wires can be brought into the wiring hub through the back of the HydroBox.
The following must be connected in order to operated the HydroBox:
• Supply voltage - HydroBox communication/control, touch screen
display, HydroBox heat pump circulating pump (M16), and domestic
hot water circulating pump (M18):
120 volt, single phase, 60 hz power off a 15 amp 1-pole circuit breaker
needs to be supplied to the HydroBox wiring hub (terminal numbers
3, 4 and 7)
APP
BY ENG
.XXX ± .005[.127]CONTROL
APP
ALL COPIES MADE, IMMEDIATELY WHEN REQUESTED BY TACO.
FORMAT REV 9-1-17
PRELIMINARY
1:2
CI
VOL
DATE
APP
MFG
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aco Inc.
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ANSI Y14.5
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FEATURE
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1
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ECO/Submittal
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THIS DOCUMENT CONTAINS INFORMATION THAT ISCONFIDENTIAL
AND PROPRIETARY TO TACO, INC. (“TACO”). IT IS PROVIDED FOR USE
ONLY FORTHE PURPOSES EXPRESSLY STATED BY TACO. BY USING
FRACTIONS±1/64[.397]
.XX ± .02[.508]
DR
CRANSTON, R.I.
APP
BY ENG
.XXX ± .005[.127]CONTROL
APP
ALL COPIES MADE, IMMEDIATELY WHEN REQUESTED BY TACO.
FORMAT REV 9-1-17
PRELIMINARY
1:2
CI
VOL
DATE
APP
MFG
IT AND YOU AGREE TO RETURN THE DOCUMENT, TOGETHER WITH
QA
INCHES [MM]
07/16/2020
aco Inc.
7REV
BREAK SHARP EDGES
R.005[.127]TO.015[.38]
FOR ANY DAMAGES ARISING OUT OF YOUR USE OR MODIFICATION TO
125
FINISHES
THIS DOCUMENT, YOU AGREE THAT TACO WILL HAVE NO LIABILITY
ANSI Y14.5
SYMBOLS PER
D
6OF
SHEET
JJK
UNLESS OTHERWISE SPECIFIED:
ANGLES ±1°
FEATURE
.XXXX ± .0005[.0127]
1
SIZE
ECO/Submittal
SCALE
THIS DOCUMENT CONTAINS INFORMATION THAT ISCONFIDENTIAL
AND PROPRIETARY TO TACO, INC. (“TACO”). IT IS PROVIDED FOR USE
ONLY FORTHE PURPOSES EXPRESSLY STATED BY TACO. BY USING
FRACTIONS±1/64[.397]
.XX ± .02[.508]
DR
CRANSTON, R.I.
Fig. 15
Fig. 16
Fig. 17: HydroBox Wiring Hub
Ferrites (F60.01 and F60.02) must be installed at X1 and X2
terminations and are included in the accessories bag.
To access the wiring terminals in the heat pump outdoor unit, remove the
two side panels as shown in gure 3. Then remove the rear panel by
unscrewing the 3 screws on each side and then tilt and lift up. Access
the DIN rail mounted terminal blocks by removing the cover of the inverter
enclosure at the bottom of the unit. See gure 16 above for wiring details
on connecting power to X1 & X2 and communications to J11.
Utility block - optional:
The utility company’s blocking contactor with main contact and
auxiliary contact should be designed according to the heat pump
output, and must be supplied on-site. The oating NO contact of
the utility company’s blocking contactor is wired to the heat pump
manager and must be connected on the relevant plug DI1 for full
block (2 hour max) or DI2 for block (where freeze protection is still
enabled). Caution! Extra-low voltage!
A (+)
COMMUNICATION TO
HEAT PUMP OUTDOOR
UNIT TERMINAL N0-J11 B (-)
1
2
1
2
1
2
1
2
1
2
N
L
N
L
8 AWG
GND
GND
GND
GND
L1
L2
OUTDOOR
TEMPERATURE SENSOR
DHW
TEMPERATURE SENSOR
HEATING DEMAND -
SMART GRID 2
FORCED COOLING
CHANGE-OVER
HEAT/COOL CIRC PUMP
0-10 VDC SIGNAL
POWER OUTPUT
CONTACTOR FOR DHW
IMMERSION HEATER
120 VAC, 1A
POWER INPUT
120 VAC, 5A
GROUND
BUFFER TANK
IMMERSION HEATER
240 VAC, 26A
710-1048
GND
A (+)
COMMUNICATION TO
HEAT PUMP OUTDOOR
UNIT TERMINAL N0-J11 B (-)
1
2
1
2
1
2
1
2
1
2
N
L
N
L
8 AWG
GND
GND
GND
GND
L1
L2
OUTDOOR
TEMPERATURE SENSOR
DHW
TEMPERATURE SENSOR
HEATING DEMAND -
SMART GRID 2
FORCED COOLING
CHANGE-OVER
HEAT/COOL CIRC PUMP
0-10 VDC SIGNAL
POWER OUTPUT
CONTACTOR FOR DHW
IMMERSION HEATER
120 VAC, 1A
POWER INPUT
120 VAC, 5A
GROUND
BUFFER TANK
IMMERSION HEATER
240 VAC, 26A
710-1048
GND
A (+)
COMMUNICATION TO
HEAT PUMP OUTDOOR
UNIT TERMINAL N0-J11 B (-)
1
2
1
2
1
2
1
2
1
2
N
L
N
L
8 AWG
GND
GND
GND
GND
L1
L2
OUTDOOR
TEMPERATURE SENSOR
DHW
TEMPERATURE SENSOR
HEATING DEMAND -
SMART GRID 2
FORCED COOLING
CHANGE-OVER
HEAT/COOL CIRC PUMP
0-10 VDC SIGNAL
POWER OUTPUT
CONTACTOR FOR DHW
IMMERSION HEATER
120 VAC, 1A
POWER INPUT
120 VAC, 5A
GROUND
BUFFER TANK
IMMERSION HEATER
240 VAC, 26A
710-1048
GND
Right hand side of the terminal block are factory wired.
X1
X2
PE
N
L
L2
L1
PE
RS485
J11
N0
Rx-/Tx-
Rx+/Tx+
GND
+A200
1~/N/PE
120V AC
60Hz
+A300
2~/N/PE
240V AC
60Hz
+A200
•
•
452169.21.14
X2
F1
N0
X1
Snap-on Ferrite
F60.02
1 Turn
Solid Core Ferrite
F60.01
2 Turns
J11
Electrical connections
In the lower section of the wiring hub is all the low voltage connection.
Required connections for proper operation of the System M includes:
• Communication between the Heat Pump outdoor unit and HydroBox
indoor unit:
The Modbus communication cable must a 24 AWG shielded, single
twisted pair (or CAT 6). The cable must be shielded and grounded at
each termination. At the HydroBox, connection is between the A(+),
B(-), and ground (terminals 1, 2 & 3) in the Hydrobox wiring hub. At
the heat pump outdoor unit, connection is between NO / J11 terminals
Rx+/Tx+, Rx-/Tx-, and ground. See gure 16.
• Outdoor Temperature Sensor:
Connect terminals 4 & 5 to the supplpied outdoor temperature sensor.
(Also see section 6.5.2)
• Domestic Hot Water Tank Temperature Sensor:
A DHW call is activated by the supplied sensor eld-installed in the
thermal well in the SMT85-1 DHW tank. Connection is between
terminals 6 & 7 in the HydroBox wiring hub and the DHW tank sensor.
(See section 6.4)
IMPORTANT. The 120 VAC power supplied to the HydroBox and the
Heat Pump outdoor unit must be run in parallel and supplied from the
same dedicated circuit. This simultaneously turns on both units, ensuring
communications synching between the two unit’s controllers.
X1
X2
PE
N
L
L2
L1
PE
RS485
J11
N0
Rx-/Tx-
Rx+/Tx+
GND
+A200
1~/N/PE
120V AC
60Hz
+A300
2~/N/PE
240V AC
60Hz
+A200
•
•
452169.21.14
X2
F1
N0
X1
Snap-on Ferrite
F60.02
1 Turn
Solid Core Ferrite
F60.01
2 Turns
J11
Electrical connections