Hotspot ACWH18 User manual

Air Conditioner Water Heater
Model ACWH18
Installation Guide
IMPORTANT! READ THIS FIRST!
Commissioning of this unit must be done by a licensed HVAC
technician. Commissioning includes making the electrical and
refrigerant line connections, evacuating and charging the unit, and
starting up the unit for the first time.
Depending on local regulations in your area, it’s possible for a qualified
end user to perform other parts of the installation.A qualified user
would be a user with expert handyman and plumbing skills, who has
performed similar work previously, and who has the required tools and
equipment.
It is up to the user to determine if a permit is needed and to determine
what self-installation work is allowed under local regulations.
Installation of this system must be done in accordance with proper
plumbing, electrical and HVAC standards such as those established
under NEC, ASHREA, AHRI and IAPMO, and must comply with state
and local codes.
The manufacturer accepts no responsibility for failure to follow the
applicable standards and codes. Failure to have a licensed HVAC
technician perform the commissioning may void your warranty.
HotSpot Energy LLC
1228 Progressive Dr. Suite 201
Chesapeake VA 23320
[e-mail]
1-757-410-8640

The following is an outline of some of the main tasks involved in pre-
installing the ACWH. We assume you have the tools and equipment, skills
and experience, etc., to perform these tasks. If you do not or if you are
not sure if you do, then refer these tasks to a professional.
Read this document entirely before proceeding.
1.Thoroughly read and understand the ACWH Owners Manual. When
doing so, pay extra attention to allowable distances and elevations
between the indoor unit and the outdoor unit, and the allowable
distance between the outdoor unit and the hot water tank. Also note
the instructions in the owners manual for the indoor unit and
condensate drain tube.
2. Determine a proper location for the outdoor unit and set a pad in
place. Pre-fabricated pads for air conditioners are available from Lowes
or Home Depot or similar retailers. Alternatively you can select an
exterior wall mount option, or pour your own concrete pad.
3. Unpack the indoor and outdoor units and carefully read and
understand all of the enclosed documentation. Place the outdoor unit
on the pad. Set the indoor unit inside away from weather.
4. Measure your distances so that you know how much and what type of
electrical lines you will need, verify capacity on your circuit breaker
panel, etc. See the owners manual for AWG and electrical
requirements. Measure the water line path between the outdoor unit
and tank so you know how much PEX and insulation to purchase and
what adapters and fittings are needed.

5. Plan the job and obtain the needed materials. For electrical you may need
Romex or you may be required to used wire in conduit or other option depending
on your situation and local code. You may need conduit, PVC or other pipe for the
outdoor connections.
For water lines we suggest ¾ PEX. If your run is over 100 ft. one-way it is possible
to exceed this maximum distance by using 1” PEX after performing a pump head
calculation and consulting the pump curve.
If you are at this point and are not sure how to proceed, you are probably not a
good candidate to perform these tasks.
6. Mount the indoor unit on the wall for placement purposes. Make sure it is
level.
7. Unpack the line-set and place one end of it near the connection to the indoor
unit and place the other end near the outdoor unit. Connect the line-set to the
indoor unit. Do not other end. If the line-set is not long enough and you did not
order a 25 ft. extension, your HVAC technician can make one easily if he knows in
advance that he will need to do so. Same applies to the control cable that
connects the indoor unit to the outdoor unit. Make a watertight professional 3”
exterior wall penetration. Fit the line-set and control cable through the hole and
carefully bend it towards the outdoor unit. Do this work neatly and carefully,
considering the requirements of the drain tube. Use tape to wrap the line-set and
control cable. Use the included grommet to seal the hole. Secure the line-set to a
wall or other structure so it cannot move in the wind, first making sure you have
enough extra line at each end for your connections. Know what kind of structural
and finish materials you are working with and obtain the correct hardware to
properly attach the line-set to the structure. Measure twice! Make sure your line-
set and cables are long enough.
8. Before starting installation of the water connections, inspect the water heater
for leaks, corrosion or other problems. If the water heater needs to be changed
out, now is the right time. If the existing water heater is acceptable, proceed
with the following installation.

Fig. 1 Tank Tap
Shown on the next page are options for
connecting the water lines from the ACWH
to the water tank. One option shown shows
the use of the Tank Tap Adapter (shown in fig
1). This adapter is designed to use the boiler
drain port as both the supply and return to the
ACWH while retaining its drain
functionality. Detailed Tank Tap instructions
follow at the end of this document. If you did
not order a Tank Tap with your unit, use the
plumbing method.
9. Shut off power to the water heater, if electric, at the fuse or circuit breaker
panel. If it’s a gas-fired water heater, close off the gas valve found ahead of
the water heater burner and controls. If gas, be sure you know how to turn
the gas on and off (including resetting the igniter safety switch) before doing
this.
Shut off the cold water supply to the water heater.
10. Empty the water heater by attaching a hose to the drain valve and
opening the pressure relief valve. If the draining water appears dirty or
cloudy, you may have to refill the water heater and drain it again, until the
draining water appears clear and free of sediment.
NOTE: Some water heaters are already plumbed with stubs extending from
the cold water line and the hot water delivery line. Use the cold
water stub, do not use the hot water stub.

Fig.2 Tank Tap w/ Existing Tank
Fig.3 Tank Tap w/ Pre-heat Tank
The Tank Tap options in Figs. 2 & 3 avoid interrupting the cold water supply line and adding a
Tee. Using the Tank Tap Adapter avoids the need for a permit in most jurisdictions.

The option in Fig. 4 is usually for a situation where the Tank Tap Adapter cannot
be used due to code, permitting, clearance or sediment issues.
NOTES Do not return the ACWH unit’s hot water by placing a Tee
in the hot water delivery pipe above the water heater. This
approach will allow water to pass from the ACWH unit directly
into the system which can create bursts of unevenly tempered
water.
Fig. 4 Normal plumbing with Tee (shown with pre-heat tank)

Note:
The HotSpot ACWH unit does not ship with factory installed boiler drain valves.
We recommend the installation of boiler drain valves and a isolation valve at the
ACWH unit end of the water lines. Drainable valves, also known as “Stop and
Waste” valves should be used, as they will allow draining of the heat exchanger if
needed and will also perform as air-bleeds when filling the system.
IMPORTANT:
*Make sure that the water lines are connected to the “cold water in” And “hot
water out” connections of the ACWH unit. Connecting the water lines to the
wrong ACWH connection will lower the efficiency of the heat recovery circuit.
*Make sure that the water line from the water heater’s cold water supply tee is
connected to the “cold water in” stub on the ACWH unit. Performance is
significantly impaired if the water line connections are reversed.
*When using the Tank Tap, note that the side-inlet of the Tank Tap connects to the
ACWH “cold in” stub and the Tank Tap end connection connects to the ACWH “hot
out’ stub. See Tank Tap instructions if using a Tank Tap.
•***IMPORTANT*** If connecting the water lines to the ACWH with copper
pipe, DO NOT BRAZE this connection, use soft solder only. Inside the unit, soft
solder is used to connect to the pump –if you heat the water line by brazing, the
solder will melt and run out, causing a leak.
Insulate the entire length of both water lines between the water heater and the
ACWH unit, using closed cell foam pipe insulation.

Purging:
Turn on the cold water supply to the water heater and allow the water heater and
the ACWH unit to fill with water. Bleed air from the system by opening the boiler
drain on the hot out side. This primes the ACHW pump. Next open the pressure
relief valve on the tank until all air is removed. Last, open a hot water faucet and
run until you feel a steady stream of flow from the hot water faucet. Note the
water will be cool because the tank has recently been drained.
6.Turn the power (or gas) back on the water heater and check for normal
operation.
NOTE:
The ACWH unit is capable of generating very hot water. Precautions should be
taken to avoid the possibility of scalding. We recommend installing a mixing or
“scald” valve to prevent scalding. Make sure that the “hot water out” line is well
insulated and protected from accidental handling or damage.
* Do not attempt to create a return of the ACWH unit hot water by modifying the
water heater’s pressure relief valve opening.

•Unique Design
•Utilizes existing Boiler or Water
Heater Drain for Inlet and Outlet
of HotSpot Unit
•No need to turn off water to
property for installation
•No permit needed for
installation in most areas

Optional Tank Adaptor Instructions
If your system was ordered to include a Tank Tap Adapter you will save time and
may avoid the need for a permit. If not, use normal plumbing procedures.
Begin by draining the
tank and flushing out any
sediment.
The old drain valve may
be thrown away.
With a sharpie, make 2
alignment marks on the
inner pipe.
Make the second
alignment mark here
Bend the pipe so it will point
up with the first alignment
marks.
Use a pipe bender to avoid
crushing or kinking the pipe.
The tube bend should
both alignment marks. Note the second mark
in open fitting. Insert a 5/16” screwdriver into
the union to hold the pipe
curved up into the tank while
checking both alignment
marks.

With the pipe pointing strait up in the tank, we
tighten the union nut to secure the inner pipe’s.
position. The inner pipe (inside the tank)
should be pointing strait up.
Double check the second alignment
mark through the drain fitting
Once the union nut is tight, tape the threads, and sweat the hose bib on.
Using PEX, continue the water line to the ACWH.

About PEX
HotSpot recommends using PEX for the water line connection.
PEX is a globally and USA code-approved water line solution that has many advantages over
copper, PVC or other water line solutions. It is available from many manufacturers and
suppliers all over the world. It is flexible, resists scale, does not corrode and is much lower in
cost and faster to install than anything on the market. PEX has been used in the USA since
1980 and in Europe since 1970.
The PEX we refer to is PEX Tube standard CTS-OD and we recommend use of ¾ diameter. It can
be purchased online or through hardware stores like Lowes or Home Depot. You will need to
have the correct adapters, fitting and tools for your system layout. If you are new to PEX, read
and study it and get extra materials to practice with.
Tools that may be needed:
Adapters and fittings:
Example application:
Just about anything you might need to know about purchasing or using PEX can be found at
www.PEXsupply.com. HotSpot is not affiliated in any way with PEX Supply.
Only use PEX rated for min. 180F. This may be but doesn’t have
to be red (hot water) PEX.