MDV MDV07IU-018F User manual
Hybrid Electric Residential Water Heaters
OWNER'S AND
OPERATION MANUAL
ǃ
噝
噝
噝
噝
˛
ˈ
0'9,8I
/
˄˅
Thank you very much for purchasing our product,
Before using your unit , please read this manual carefully and keep it for future reference. ˄˅
ǃ
噝
噝
噝
噝
˛
ˈ
0'9,8I
/
˄˅
˄˅
ǃ
噝
噝
噝
噝
˛
ˈ
0'9,8I
/
˄˅
WARNING
This unit is required reliable earthing
before usage,otherwise might cause
death or injury
!
Please ask skilled service persons for reliable
earthing connection˄Refer to page12˅Your safety is the most important thing we concerned !
PARTS NAMES
Fan Assy
PT Valve
Top Cover
Evaporator
Rear Shroud
Water Outlet
Water Inlet
Drainpipe
TCO
Electric Heater(Upper)
Electric Heater(Lower)
Filter
TOD
Front Shourd
Cover,Electric Heater(Upper)
Front Decorative Board
Cover,Electric heater(Lower)
Electronic Control Box
Display
NOTE
All the picture in this manual are for explanation purpose only. They may be slightly different from the heat pump water heaterr you
purchased (depand on model).The actual shaped shall prevail.
T2
CONTENTS
PAGE
Safety Information..........................................1~2
Operating Instructions...................................3~7
Care and Cleaning..........................................8~9
Installation Instructions .............................10-14
Troubleshooting Tips..................................15-16
ǃ
噝
噝
噝
噝
˛
ˈ
0'9,8I
/
˄˅
˄˅
owner’s manual
1
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
SAVE THESE INSTRUCTIONS
WARNING!
WATER TEMPERATURE ADJUSTMENT
!
For your safety, the information in this manual must be followed to minimize the risk of fire or explosion, electric shock, or to
prevent property damage, personal injury, or loss of life.
Be sure to read and understand the entire Owner’s Manual before attempting to install or operate this water heater. It may save
you time and cost. Pay particular attention to the Safety Instructions. Failure to follow these warnings could result in serious bodily
injury or death. Should you have problems understanding the instructions in this manual, or have any questions, STOP and get
help from a qualified service technician or the local electric utility.
Safety and energy conservation are factors to be considered when selecting the water temperature setting via the water heater’s
user interface. Water temperatures above 125°F can cause severe burns or death from scalding. Be sure to read and follow the
warnings outlined on the label pictured below. This label is also located on the water heater near the top of the tank.
ǃ
噝
噝
噝
噝
˛
Time/Temperature Relationship in Scalds
TemperatureTime to Produce a Serious Burn
120°FMore than 5 minutes
125°F1-1/2 to 2 minutes
130°FAbout 30 seconds
135°FAbout 10 seconds
140°FLess than 5 seconds
145°FLess than 3 seconds
150°FAbout 1-1/2 seconds
155°FAbout 1 second
Table courtesy of Shriners Burn Institute
DANGER:
Mixing valves for reducing point-of-use water temperature
by mixing hot and cold water in branch water lines are
available. Contact a licensed plumber or the local
plumbing authority for further information.
The chart shown above may be used as a guide in
determining the proper water temperature for your home.
NOTE: Households with small children, disabled or
elderly persons may require a 120°F or lower thermostat
setting to prevent contact with “HOT” water.
There is a Hot Water SCALD Potential if the control
water temperature is set too high.
Water temperature over 120°F can cause severs burns
instantly or death from scalds.
The electronic temperature control setting usually
approximates tap water temperature .However,factors
could cause water temperature to reach 160°F regard-
less of the control setting.Always feel water before
bathing and showering.
Children,disabled and elderly are elderly are at highest
risk of being scalded.
See instruction manual before setting temperature at
water heater.
Feel water before bathing or showering.
Temperature limiting valves are available;see manual.
WARNING:
Gasoline, as well as other flammable materials and liquids
(adhesives, solvents, etc.), and the vapors they produce are
extremely dangerous.DO NOT handle, use or store gasoline or
other flammable or combustible materials anywhere near or in the
vicinity of a water heater. The arc drawn in the water heater controls
can ignite these vapors. Failure to do so can result in property
damage, bodily injury or death.
FOR INSTALLATIONS
IN THE STATE OF CALIFORNIA
California Law requires that residential water heaters must be
braced, anchored or strapped to resist falling or horizontal displace-
ment due to earthquake motions. For residential water heaters up to
52 gallon capacity, a brochure with generic earthquake bracing
instructions can be obtained from: Office of the State Architect, 400
P Street, Sacramento, CA 95814 or you may call 916.324.5315 or
ask a water heater dealer.
However, applicable local codes shall govern installation. For
residential water heaters of a capacity greater than 52 gallons,
consult the local building jurisdiction for acceptable bracing
procedures.
California Proposition 65 Warning: This product contains chemicals
known to the State of California to cause cancer, birth defects or
other reproductive harm.
ˈ
0'9,8I
/
˄˅
˄˅
owner’s manual
2
Operating the water heater
WARNING:
Safety Precautions
CAUTION:
Safety Controls
WARNING:
Hydrogen gas can be produced in a hot water system served by this water heater that has not been used for a long period of time
(generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE!! To dissipate such gas and to reduce risk of
injury, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical
appliance connected to the hot water system. If hydrogen is present, there will be an unusual sound such as air escaping through
the pipe as the water begins to flow. Do not smoke or use an open flame near the faucet at the time it is open.
A. Do turn off power to water heater if it has been
subjected to overheating, fire, flood or physical damage.
B. Do Not turn on water heater unless it is filled with
water.
C. Do Not turn on water heater if cold water supply
shut-off valve is closed.
D. Do Not store or use gasoline or other flammable
vapors and liquids, such as adhesives or paint thinner, in
the vicinity of this or any other appliance. If such
The water heater is equipped with two temperature-limiting
controls (TCO and TOD) that are located above the heating
element in contact with the tank surface. If for any reason the
temperature becomes excessively high, the temperature-
limiting control (TCO or TOD) breaks the power circuit to
the heating element. Once the control opens, it must be
reset manually. Resetting of the temperature limiting
controls should be done by a qualified service technician.
If the water heater has been subjected to flood, fire, or
physical damage, turn off power and water to the water
heater.
Do not operate the water heater again until it has been
thoroughly checked by qualified service personnel.
The cause of the high temperature condition must
be investigated by a qualified service technician and
corrective action must be taken before placing the water
heater in service again.
flammables must be used, open doors and windows for ventilation.
NOTE: Flammable vapors may be drawn by air currents from surround-
ing areas to the water heater.
E. If there is any difficulty in understanding or following the Operating
Instructions or the Care and Cleaning section, it is recommended that a
qualified person or serviceman perform the work.
To reset the temperature-limiting control:
1. Turn off the power to the water heater.
2. Remove the jacket access panel(s) and insulation.
The thermostat protective cover should not be removed.
3. Press the red RESET button.
4. Replace the insulation and jacket access panel(s) before turning on
the power to the water heater.
ǃ
噝
噝
噝
噝
˛
READ AND FOLLOW THIS SAFETY INFORMATION CAREFULLY
SAVE THESE INSTRUCTIONS
ˈ
0'9,8I
/
˄˅
˄˅
owner’s manual
3
About the controls
Controls
Up
Use up arrow to increase value or turn page up
For starting or shutting down the unit, note: when
the unit is stand-by, the function still can be used
An illuminated lamp means the unit is running, an
emitted lamp means the unit stop running, and a
flashing lamp means the unit is in error or under
protection.
Running lamp
Display
Power
Down
For decrease the value or turn page down
For users to choose operating mode, auto mode,
economic mode and electric mode
ENTER
For confirm or unlock the key. After change
the setpoint temperature through keys,
consumer need press this key in 10 seconds
to confirm; or else, the setpoint temperature can
not change. When the panel is locked, we can
press this key for 3 seconds to deactivate the lock.
Mode
2
1
3
4
5
6
8
7
1
2
3
4
5
6
7
8
Detailed description on the control
function:
Vacation
Use this button during times of no water usage,
such as vacation for an extended period of time.
1 Auto confirm function
After 10 second of pressing the pad and no other
operation, this key will be confirmed and the
operation is effective.
2Auto lock function
When no pressing of any keys for 1 minute, the
control pad will be locked. To deactivate the lock,
press and hold the ENTER pad for three second.
3Query function
This function is for checking the parameter of the
unit when conducting repairing after sales, and for
users.
4Screen save
To extend the life of the screen, the screen will be
dimmed when there is no operation for a
period of time. Press any key to activate the
screen.
ENTER
owner’s manual
4
ǃ
噝
噝
噝
噝
˛
Turning on the water heater
Peak load shifting mode 1
Peak load shifting mode
High temperature setting
Lock icon
Alarm icon
1
1
2
3
4
5
6
7
8
9
10
11
7
8
9
2 3 4 5 6
1011
Auto mode icon
Economic mode icon
Electric mode icon
Water temperature icon
Parameter icon
Controls
Vacation
Under this mode, 1 will be illuminated, heat pump
mode will be run, users can set water temp.
Under this modeˈ 2 will be illuminated, heat
pump mode will be run, users cannot set water
temp. the water temp is set to be 110F.
It will be illuminated when the unit is under economic
mode and will be emitted when the unit is not under
Economic mode
Note:when the unit is under Economic mode this
icon will flash slowly.
It will be illuminated when the unit is under electric
heat mode and will be emitted when the unit is not
under electric heat mode
Note:when the unit is under electric heat mode this
icon will flash slowly.
There are 3 phases
When 140F TS 120F, all 3 phases will be illuminated
When 120F TS 110F, lower 2 phases will be
illuminated
When 110F TS 100F, lowest phase will be illuminated
Note:TS is preset water temperature.
This icon will be illuminated when power supply is
connected, normally it will show water temperature,
when there is error or protection, it will show error code
or protection code, when error or protection stops, it
will show water temperature again, besides, “query”
will show unit parameter.
If the temp set by user or actual temp is above 120F,
this icon will be illuminated, it will be emitted when
the temp is ≤120F or the unit is closed or under
screen save modeIt will be illuminated when the key is locked, and will
be emitted when the key is unlocked.
It will flash when there is error of the unit or the unit
is under protection, meanwhile, the buzzer will buzz,
and it will be emitted when the error or protection
is stopped.
It will reduce the energy consume and avoid water
frozing when unit is running on vacation mode.
Green light is illuminated when feature is on.
It will be illuminated when the unit is under auto
mode and will be emitted when the unit is not under
auto mode.
Note:when the unit is under auto mode this icon
will flash slowly.
0'9,8I
/
˄˅
˄˅
owner’s manual
5
ǃ
噝
噝
噝
噝
˛
ˈ
Time/Temperature Relationship in Scalds
Temperatur e Time to Produce a Serious Burn
120°F More than 5 minutes
125°F 1-1/2 to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1-1/2 seconds
155°F About 1 second
DANGER:
To Adjust the Temperature
DANGER:
About the water temperature setting
The temperature of the water in the water heater can
be regulated by adjusting the temperature setting up
or down using arrow keys on the control panel.
Safety and energy conservation are factors to be
considered when selecting the water temperature
setting of the water heater. The lower the temperature
setting, the greater the savings in energy and operat-
ing costs.To comply with safety regulations, the water
temperature is factory set at 120°F where local codes
require. This is the recommended starting
point.
Water temperatures above 125°F can cause severe
burns or death from scalding. Be sure to read and
follow the warnings outlined in this manual and on the
label on the water heater. This label is located on the
water heater near the upper element access panel.
Mixing valves for reducing point-of-use water
temperature by mixing hot and cold water in
branch water lines are available. Contact a licensed
plumber or the local plumbing authority for further
information.
The chart below may be used as a guide in
determining the proper water temperature for your
home.
There is a hot water scald potential if the water
temperature is set too high.
Households with small children, disabled, or elderly
persons may require a 120°F or lower thermostat
setting to prevent contact with HOT water.
Table courtesy of Shriners Burn Institute
Press the UP or DOWN key on the control panel.
Then the temperature can be increased or
decreased by pressing the UP or DOWN keys. After
the desired temperature setting has been achieved,
you need press ENTER key to accept this set
point.(If you do not press the ENTER key in 10
seconds, the set point can not change.)
There is Hot Water SCALD Potential if the water
temperature is set too high.120°F is the recom-
mended water temperature setting, but it can be
adjusted to any temperature between 100°F and
140°F.
0'9,8I
/
ENTER
˄˅
˄˅
owner’s manual
6
ǃ
Adjusting the water temperature and function mode
This water heater defaults to the Auto operating
mode. The Auto mode is the recommended setting
for this wate r hea ter, but can be changed if
desired.
Eco mode
Eco mode is the most energy-efficient mode for this
water heater.. It takes heat from the surrounding air
to heat the water. The time it takes to heat the water
is longer in this mode, so it may NOT be sufficient if
you have high-demand situation such as a large
household or company.
Electric Mode
This mode uses only the upper and lower heating
resistance elements to heat the water. The time it
takes to heat the water is less in this mode, but it is
the LEAST energy-effcient mode.
Auto Mode —RECOMMEN DED MODE
Auto mode combines the energy efficiency of with
the recovery speed and power of the
Electric mode, with normal water usage.
About the feature buttons on the user interface
Vacation
This feature is used when you will be away from
the home for an extended period of time and hot
water is not needed. In this mode, the unit will
drop the water temperature down to 50ºF and
will use the most efficient heating mode to
conserve energy while the heater is sitting idle.
The unit will automatically resume heating one
day before your return, so that hot water will be
available. For example if you will be gone 14days,
press the VACATION button, press the UP arrow
button until the display reads 14days (the default
is 14 days) and press ENTER. The unit will drop the
water temperature down to 50ºF for 13 days. At the
end of the 13th day, it will automatically return to the
previous operating mode and heat the water to the
original temperature setting.
The green light will be illuminated when this
feature is on.
噝
噝
噝
噝
˛
ˈ
0'9,8I
/
˄˅
˄˅
owner’s manual
7
ǃ
Useing the combination buttons
Combination buttons functon thought combinatong buttons
can convert the temperature display from F to C,or inquire
component’s parameters. there is also dan clear all the
malufunction code an clear alarm
1.F or C conversion
The water temperature display will default to
F .to show the temperature in C.press the
“ENTER”and “Mode”buttons at the same time
last for second.
NOTE:to change back to F,repeat press the two
buttons
2.Inquire component’s parameters
To inquire component’s paramters.press the
“Lock”and ”Up”buttons at the same time
last for 1 second
NOTE:to exit theinquire functon,press the
“ENTER”and “Up” burrons at the same time
last for 1 second
3.Clear alarm
To clear malufuncton,press “ENTER”and “Down”
burrons at the same time last for 1 second
4.Clear alarm
To ckear alarm,perss”ENTER” and ”Auto mode icon”,
burrons at the same time last for 1 second
噝
噝
噝
噝
˛
ˈ
Demand response (on same models)
The Hybrid Electric heat pump water heater is compatible
with the Demand Response (DR) module which can be
purchased separately. Contact your local utility to see if
your area is using DR technology.
The following demand response features are available as
part of a pilot test program with the local utility company to
help consumers reduce peak electricity usage in the
home.
INSTALLATION
The DR module is equipped with magnets in the base
of the module that will enable it to be attached to the
painted metal exterior of the heat pump water heater.
Details on how to connect the cables to the module are in
the instructions that come with the module.
Once the cable from the DR module is plugged
into the water heater’s connection, follow the
power-up directions included with the DR module.
As soon as the DR module is operating, the heat
pump water heater is ready to receive
the DR signals.
QUICKGUIDE
If your local utility company is utilizing DR technol-
ogy, the DR module will receive the signals sent
from your utility company. One of four signals will
be sent: “Low”represents that the lowest energy
cost rate is available,“Medium”and “High” signals
represent increasing energy cost steps, and the
Critical signal represents “peak rate”energy. A
heat pump water heater equipped with a DR
module will automatically recognize what energy
cost rate is available and adjust its mode and
temperature setting to use less energy when rates
are medium, high and critical. When the heat
pump water heater responds to these signals, it
will display the letters “EP”in the screen, along
with other information, indicating that energy
pricing periods are in effect.
When the signal is low or when no DR module is
connected, the unit runs as normal. The following
steps show how the unit reacts to Medium, High
and Critical signal levels.
DRmodule
DRconnector
0'9,8I
/
˄˅
˄˅
owner’s manual
8
ǃ
噝
噝
噝
噝
˛
ˈ
Draining the Water Heater
Shut off power to the water heater before
draining water.
CAUTION:
DANGER:
DANGER:
Routine Preventive Maintenance
Before manually operating the relief valve, make
certain no one will be exposed to the danger of
coming in contact with the hot water released by
the valve. The water may be hot enough to create
a scald hazard. The water should be released into
a suitable drain to prevent injury or property
damage.
NOTE:If the temperature and pressure-relief
valve on the hot water heater discharges
periodically, this may be due to thermal expansion
in a closed water system. Contact the water
supplier or your plumbing contractor on how to
correct this. Do not plug the relief valve outlet.
Properly maintained, your water heater will
provide years of dependable trouble-free service.
It is suggested that a routine preventive mainte-
nance program be established and followed by
the user.
Periodic Inspection:
It is further recommended that a periodic inspec-
tion of the operating controls, heating elements
and wiring should be made by service personnel
qualified in electric appliance repair.
Most electrical appliances, even when new, make
some sound when in operation. If the hissing or
singing sound level increases excessively, the
electric heating element may require cleaning.
Contact a qualified installer or piumber for in
spection.
Temperature and Pressure-Relief Valve:
At least once a year, lift and release the lever
handle on the temperature and pressure-relief
valve, located on the back-left side of the water
heater, to make certain the valve operates freely.
Allow several gallons to flush through the
discharge line to an open drain.
Flushing Tank:
A water heater’s tank can act as a settling basin
for solids suspended in the water. It is therefore
not uncommon for hard water deposits to
accumulate in the bottom of the tank. To clean the
tank of these deposits, open the drain valve
located under the large decorative cover near the
bottom of the unit and drain a few quarts of water
from the water heater every month.
Before manually operating the relief valve,
make certain no one will be exposed to the hot
water released by the valve. The water drained
from the tank may be hot enough to present a
scald hazard and should be directed to a
suitable drain to prevent injury or damage.
Attach a garden hose to the drain valve located
at the bottom of the unit and direct that hose
to a drain. The decorative front cover must be
removed to access the valve.
In order to drain the water heater completely, turn
off the cold water supply open a hot water faucet
or lift the handle on the relief valve to admit air to
the tank.
Open the drain valve.
Use a flat
screwdriver
to turn
valve.
Decorative
cover
Vacation and Extended Shutdown
If the water heater is to remain idle for an
extended period of time, the power and water to
the appliance should be turned off to conserve
energy and prevent a buildup of dangerous
hydrogen gas.
The water heater and piping should be drained if
they might be subjected to freezing temperatures.
After a long shutdown period, the water heater’s
operation and controls should be checked by
qualified service personnel.Make certain the water
heater is completely filled again before placing it
in operation.
NOTE: Refer to the Hydrogen Gas Caution
in the Operating Instructions.
0'9,8I
/
˄˅
˄˅
owner’s manual
9
ǃ
噝
噝
噝
噝
˛
ˈ
Cleaning the Filter
Filter
3”
Clearing the Condensation Drain Tubes
In the Auto , Eco mo des. the heater moves air
through the system and out the top of the unit.The
filter is in slace to protect the evaporator from dirt and
dust.
A clean air filter is important to get the highest
efficiency.Occasionally this filter will need to be
cleaned (minimum is once a year ). When the filter
requires cleaning,the red light above the filter button
will be illuminated and an audible beep will
sound.The screen will display instructions that the
filter needs to be cleaned. When this screen is
displayed ,you can press the arrow button for
instructions on how to clean the filter.
NOTE:If the filter gets too dirty,the unit will automati-
cally switch to Standard Electric mode and energy
savings will be lost.
Leave the power on and remove the filter from the top
of the unit. It is located in the top of the unit behind
the hot and cold inlet pipes. Grasp the plastic handle
and slide the filter straight uo until it clears the
cover.Once it has been removed,the filter can be
wiped clean with a damp rag or rinsed with warm
water.
Once the filter has been cleaned ,it can be replaced
by aligning it into the slot in the top of the unit and
sliding it down into place.
when the handle is flush with the top of the cover ,it is
seated.
When the clean filter has been reinstalled,press the
FILTER button and then press ENTER.
IMPORTANT F:ilter must be cleaned when the alarm
is displayed.A dirty filter will make the system work
harder and result in a reduction of erriciency and
possible damage to the system .Inorde to get the best
energy erriciency acailabel ,make sure you filter is
clean.
There are two drain hoses that are attached to the back
of the heater. If both of these get clogged,water will spill
down the outside of the unit.The primary drain is
intended to carry all condensate away. If it is clogged or
if the hose is kinked, the condensate will exit the
secondary drain tube and onto the floor .This is
intended as a notification to the user that the primary
drain is clogged. Remove the drain hose, clear any
debris and reattach.
Periodically inspect the drain lines and clear any
debris that may have collected in the lines.
See Installation Instructions for more information.
Tube (overflow)
Main drain tube
Direct the main drain
tube into a drain
0'9,8I
/
˄˅
˄˅
owner’s manual
10
ǃ
噝
噝
噝
噝
˛
ˈ
Installation
Water Heater
Instructions
Models
RSJ-15/190RDN3-C
LOCATION (CONT.)
WARNING:
Required clearances:
Condensation
drain
B
A
LOCAL INSTALLATION REGULATIONS
PPOWER REQUIREMENTS
LOCATION
CAUTION:
16”
5-1/2” 5-1/2”
The location chosen for the water heater must take into
consideration the following:
This water heater must be installed in accordance with
these instructions, local codes, utility codes,utility
company requirements or, in the absence of local codes,
the latest edition of the National Electrical Code.
It is available from some local libraries or can be
purchased from the National Fire Prevention
Association,Batterymarch park, Quincy, MA 02169 as
booklet ANSI/NFPA 70.
Check the markings on the rating plate of the water
heater to be certain the power supply corresponds to
the water heater requirements.
Locate the water heater in a clean dry area as near as
practical to the area of greatest heated water demand.
Long uninsulated hot water lines can waste energy and
water.
NOTE:Because this unit draws in air from the room to
heat the water, the room must be at least 10’ x 10’ x 7’
(700 cubic feet) or larger. If the room is smaller, there
must be a louvered door.
Place the water heater in such a manner that the air
filter,cover and front panels can be removed to permit
inspection and servicing,such as removal of elements or
cleaning the filter.
The water heater and water lines should be protected
from freezing temperatures and high-corrosive
atmospheres . Do not install the water heater in outdoor,
unprotected areas.
The water heater should not
be located in an area where leakage of the tank or
connections will result in damage to the area adjacent to
it or to lower floors of the structure.Where such areas
cannot be avoided, it is recommended that a suitable
catch pan, adequately drained, be installed under the
water heater.
This water heater SHOULD NOT vapors are to be used
or stored. Such liquids include gasoline,LP gas (butane
and propane), paint or adhesives and their thinners,
solvents or removers. Because of natural air vapors can
be carried from where their liquids are being used or
stored. The arc drawn within the water heater’s control
can result in severe burns or death to those in range, as
well as property.
Route to open drain.
Line should be at least
3/4” ID and pitched for
proper drainage.
A—Diameter of water
heater plus 2” min.
B—Maximum 2”
NOTE: Auxiliary catch pan MUST conform to local
codes.Catch Pan Kits are available from the store where the
water heater was purchased, a builder store or any water
heater distributor.
There must be a 7” clearance recommended (air space), with
a 5-1/2” minimum clearance between any object and the front
and rear covers in the event service is needed.
A 16” minimum clearance is required to remove the filter for
cleaning.The hot and cold water plumbing
and electrical connections must not interfere with the removal
of the filter.
The unit has a condensate drain; therefore a drain must be
available in close proximity to the unit. The drain must be no
higher than “36” above the floor(laundry drain is acceptable).
If no drain is available, then a common condensate pump with
a capacity no less than 1 gallon/day must be purchased from
a local builder and supply store and installed. 0'9,8I
/
˄˅
˄˅
owner’s manual
11
ǃ
3”
hose
6’
hose
WATER SUPPLY CONNECTIONS
.
TYPICAL INSTALLATION
Installation Instructions
THERMAL EXPANSION
WARNING:
CONDENSATION DRAIN TUBES
Drain
valve
To cold water supply
6“ air gap
Relief valve discharge line
to suitable open drain
Union
Union
Thermal
expansion
tank (if required)
Shut-off valve
Hot water outlet
to fixtures
噝
噝
噝
噝
˛
The water heater should not be installed in a space
where liquids which give off flammable vapors are
to be used or stored.
Determine if a check valve exists in the inlet water
line.I t may have been installed in the cold water
line as a separate backflow preventer,or it may be
part of a pressure-reducing valve, water meter or
water softener.
A check valve located in the cold water inlet line
can cause what is referred to as ac “losed water
system.”
A cold water inlet line with no check valve or
backflow prevention device is referred to as an
“open” water system.
As water is heated, it expands in volume and
creates an increase in the pressure within the
water system.
This action is referred to ast “ hermal expansion.”
In an “open” water system, expanding water which
exceeds the capacity of the water heater flows
back into the city main where the pressure is easily
dissipated.
A “closed water system,” however, prevents the
expanding water from flowing back into the main
supply line, and the result oft“hermal expansion”
can create a rapid and dangerous pressure
increase in the water heater and system piping.
This rapid pressure increase can quickly reach the
safety setting of the relief valve, causing it to
operate during each heating cycle.
Thermal expansion, and the resulting rapid and
repeated expansion and contraction of compo-
nents in the water heater and piping system, can
cause premature failure of the relief valve, and
possibly the heater itself. Replacing the relief
valvew ill not correct the problem!
The suggested method of controlling thermal
expansion is to install an expansion tank in the
cold water line between the water heater and the
check valve (refer to the illustration on right). The
expansion tank is designed with an air cushion
built in that compresses as the system pressure
increases, thereby relieving the over-pressure
condition and eliminating the repeated operation of
the relief valve. Other methods of controlling
thermal expansion are also available. Contact your
installing contractor, water supplier or plumbing
inspector for additional information regarding this
subject.
Refer to the illustration below for suggested typical installa-
tion.
The installation of unions or flexible copper connectors is
recommended on the hot and cold water connections so that
the water heater may be easily disconnected for servicing if
necessary. The HOT and COLD water connections are clearly
marked and are 3/4” NPT on all models.
NOTE :Install a shut-off valve in the cold water line near the
water heater. This will enable easier service or maintenance
of the unit later.
IMPORTANT: Do not apply heat to the HOT or COLD water
connections. If sweat connections are used, sweat tubing
to adapter before fitting the adapater to the cold water
connections on heater. Any heat applied to the hot or cold
water connection will permanently damage the dip tube.
To electrical
distribution panel
Electrical junction
box (use only
copper
conductors)
Tem perature and
pressure-relief valve
(shown in different
location for clarity)
Jacket
access panel
Jacket
access panel
Auxiliary
catch pan 2”
maximum
This unit has a condensation tray. The water collected in the
tray drains out of the tube coming off the back of the unit.Two
flexible hose that both of these hoses are attached to the two
drain ports coming off the back of the unit.Attach one end of
the longer 6’ hose to the lower drain port on the back of the
unit,underneath the rear cover. Direct the other end to a drain
in the floor or no higher than 3’ above the floor.If such
drain is unavailable, a
condensate drain pump (not
provided) must be purchased
and installed. Attach the sho-
rter 3” hose to the top drain port.
ˈ
0'9,8I
/
˄˅
˄˅
owner’s manual
12
ǃ
噝
噝
噝
噝
Installation
Instructions
RELIEF VALVE
WARNING:
TO FILL THE WATER HEATER
WARNING:
CAUTION:
ELECTRICAL CONNECTIONS
WARNING:
Water heater junction box
Ground screw
Junction box cover
240V
L2
L1
CAUTION:
˛
A new combination temperature and pressure-relief
valve, complying with the Standard for Relief Valves and
Automatic Gas Shut-Off Devices for Hot Water Supply
Systems, ANSI Z21.22, is supplied and must remain
installed in the opening provided and marked for the
purpose on the water heater. No valve of any type
should be installed between the relief valve and the tank.
Local codes shall govern the installation of relief valves.
The pressure rating of the relief
valve must not exceed 150 PSI, the maximum working
pressure of the water heater as marked on the rating plate.
The BTUH rating of the relief valve must not be less than the
input rating of the water heater as indicated on the rating label
located on the front of the heater (1 watt=3.412 BTUH).
Connect the outlet of the relief valve to a suitable open drain so
that the discharge water cannot contact live electrical parts or
persons and to eliminate potential water damage.
Piping used should be of a type approved for hot water
distribution. The discharge line must be no smaller than the
outlet of the valve and must pitch downward from the valve to
allow complete drainage (by gravity) of the relief valve and
discharge line. The end of the discharge line should
not be threaded or concealed and should be protected
from freezing. No valve of any type, restriction or reducer
coupling should be installed in the discharge line.
Do not mis-wire electrical connections. 240V AC must be
applied to L1 and L2 wires as shown in illustrion to the right.
Failure to do so will VOID the warranty, and can result in 120V
applied to water heater, which may damage the compressor or
other electrical components.
To reduce the risk of excessive pressures and temperatures in
this water heater, install temperature and pressure protective
equipment required by local codes and no less than a
combination temperature and pressure relief value certified by
a nationally recognized testing laboratory that maintains
periodic inspection of production of listed equipment or
materials, as meeting the requirements for Relief Valves and
Automatic Gas Shut-Off Devices for Hot Water Supply
systems,ANSI Z21.22. This valve must be marked with a
maximum set pressure not to exceed the marked maximum
working pressure of the water heater. Install the valve into an
opening provided and marked for this purpose in the water
heater, and orient it or provide tubing so that any discharge
from the valve exits only within 6 inches above or at any
distance below,the structural floors and does not contact any
live electrical part. The discharge opening must not be blocked
or reduced in size under any circumstances.
A separate branch circuit with copper conductors, overcurrent
protective device and suitable disconnecting means must b e
provided by a qualified eldctricianAll wiring must conform to local codes or latest edition of
National Electrical Code ANSI/NFPA 70.
The water heater is completely w ired to the jun ction box at
the top of the water heater. An opening for 1/2” or 3/4”
electrical fitting is provided for field wiring connection.
The voltage requirements and wattage load for the water
heatr are specified on the rating label on the front of the
water heater.
The branch circuit wiring should include either:
1. Metallic conduit or metallic sheathed cable approved
for use as a grounding conductor and installed with fittings
opproved for the purpose
2. Nonmetallic sheathed cable, metallic conduit or metallic
sheathed cable not approved for use as a ground conductor
shall include a separate conductor for grounding. It should be
attached to the ground terminals of the water heater and the
electrical distribution box.
Proper ground connection is
essential. The presence of water in the piping and water
heater does not provide sufficient conduction for a
ground.Nonmetallic piping,dielectric unions,flexible connectors,
etc., can cause the water heater to be electrically isolated.
ˈ
0'9,8I
The tank must be full of water before heater is turned
on. The water heater warranty does not cover damage
or failure resulting from operation with an empty or
partially empty tank.
Make certain the drain valve is completely closed.
Open the shut-off valve in the cold water supply line.
Open each hot water faucet slowly to allow the air to
vent from the water heater and piping.A stady flow of
water from the hot water faucet(s ) indicates a full water
heater.
/
˄˅
˄˅
owner’s manual
13
ǃ
The manufacturer’s warranty does not cover any
damage or defect caused by installation, attachment
or use of any type of energy-saving or other
unapproved devices (other than those authorized by the
manufacturer) into, onto or in conjunction with the water
heater. The use of unauthorized energy-saving devices
may shorten the life of the water heater and may
endanger life and property.
The manufacturer disclaims any responsibility for
such loss or injury resulting from the use of such
unauthorized devices.
If local codes require external application of insulation
blanket kits, the manufacturer’s instructions included
with the kit must be carefully followed.
Application of any external insulation, blankets or
water pipe insulation to this water heater will require
careful attention to the following:
噝Do not cover access panels to the heating elements.
噝Do not cover the electrical junction box of the
water heater.
噝Do not cover the operating or warning labels attached
to the water heater or attempt to relocate them on
the exterior of the insulation blanket.
噝Do not block the air inlet outlets below and in the top
covers.
Typical horizontal
piping arrangement
Typical vertical piping
arrangement
˛
ˈ
0'9,8I
To fluently drain condensate water from evaporator, please
install the main unit at a horizontal floor. Otherwise, please
ensuring the drain vent is at the lowest place. Recommend-
ing the inclination angle of unit to the ground should no more
than 2°.
F
ilter installing at the main unit inlet. In terms of the main unit
connect with canvas, filter in there must be put forward to the
air inlet of duct. D
Owner should install the
pipe by self;and the
mesh size Φ= 8 Inch
L≤5M
Drain Drain
≤2o
/
Installation Instructions
˄˅
≤2o
Drain
˄˅
owner’s manual
14
ǃ
NOTE:
Installation
Instructions
噝
噝
噝
噝
BRANCH CIRCUIT SIZING GUIDE
Total Water Recommended Over-Current Protection
Heater Wattage (fuse or circuit breaker amperage rating)
208V 240V 277V 480V
3,000 20 20 15 15
4,000 25 25 20 15
4,500 30 25 25 15
5,000 30 30 25 15
5,500 35 30 25 15
6,000 40 35 30 20
8,000 50 45 40 25
9,000 – 50 45 25
10,000 – – 50 30
11,000 – – 50 30
12,000 – – – 35
Total Water Copper Wire Size AWG Based
Heater Wattage on N.E.C. Table310-16 (75°C. )
208V 240V 277V 480V
3,000 12 12 14 14
4,000 10 10 12 14
4,500 10 10 10 14
5,000 10 10 10 14
5,500 8 10 10 14
6,000 8 8 10 12
8,000 8 8 8 10
9,000 – 8 8 10
10,000 – – 8 10
11,000 – – 8 10
12,000 – – – 8
˛
This guide recommends minimum branch circuit sizing
based on the National Electric Code.Refer to wiring
diagrams in this manual for field wiring connections.
ˈ
0'9,8I
/
ACCESSORIES
˄˅
Discharge condensatedwater
1
1
Accessory nameQty.Sharp Purpose
1
Installation and use instruction
This manual
Pump to allow air circulation
The HOT and COLD water connections are clearly marked
and are 3/4” NPT on all models.
˄˅
ǃ
噝
噝
噝
噝
Installation Instructions
INSTALLATION CHECKLIST
WHAT TO EXPECT FOR “NORMAL STARTUP”
Elapsed Time HEWH Actions Comments
0 to 1.5 minutes Unit is silent This 3-minute off -time prevents
compressor damage.
1.5 to 3 minutes Fans turn on
8 to 30 minutes Compressor turns off,and Up-
per Element turns on for about 20
minutes
To quickly provide initial amount of hot water for
user (about 25 gallons).
user efficient heat pump for majority of heating
30 minutes and
beyond
Upper element turns off and
compressor turns back on
NOTE: The heat pump operating ranges is 45°F to 120°F. If the adbient temperature is outside of this range, the heat
pump will not be able to run and the backup electric elements will be used until the ambient temperature returns to within
the operating range
˛
1. Tank location:
– Is room size less than 10’ x 10’ x 7’ (700 cu. ft.)? If yes, louvered door or similar ventilation is needed.
– Back of unit away from wall by 7 inches.
2. Plumbing connections:
–Does not prevent air filter removal.
–No leaks after filling the tank with water,either when water is flowing or not.
3. Condensate lines are in place:
1) Short tube on upper drain nozzle.
2) Longer tube on lower drain nozzle and directed into a floor drain or a condensate pump.
4.Temperature and pressure-relief valve is working and drain line completed per local code.
5. Electrical connection does not prevent air filter removal.
6.Verify control panel displays 120°F Auto mode.
7.Front cover is in place.
After the unit has been installed, with all electrical and water connections secure and checked, then the unit
should be filled with water (vent tank by opening a hot water faucet somewhere in home to allow tank to fully fill
with water).Once tank is full and power is energized, the user must press the POWER button on the user
interface. The unit will then remind the user to ensure tank has been filled ,and to acknowledge by pressing
POWER again.
ˈ
0'9,8I
/
owner’s manual
15
˄˅
˄˅
This manual suits for next models
1
Table of contents
Other MDV Water Heater manuals
Popular Water Heater manuals by other brands
A.O. Smith
A.O. Smith CEWH-A1 Series Installation instructions manual
Raypak
Raypak HI DELTA HD101 THRU 2342B Installation & operating instructions
Noritz
Noritz EZ111DV owner's guide
State Water Heaters
State Water Heaters 50 DXRS parts list
Bryant
Bryant 513A installation instructions
A.O. Smith
A.O. Smith Water Heater 520 Direct Vent Indoor Service manual
SOLE
SOLE EUROSTAR ECO Series Installation & user manual
Webasto
Webasto DBW 46 installation instructions
Bosch
Bosch JUNKERS UNIDOMO ELAFLUX ED 18-2 E installation instructions
Bosch
Bosch RDE 1821415 Installation and operating instructions
Sygonix
Sygonix SY-5247282 operating instructions
Galmet
Galmet SGW 120 Installation and operating manual / warranty card