NTI COMPACT, COMPACT 4, COMPACT 6, COMPACT 2.5 Installation And Operation Instructions Manual
Installation and Operation Instructions
NTI COMPACT SERIES
NTI COMPACT 2.5
NTI COMPACT 4
NTI COMPACT 6
Electric Mini Tank Water heaters
Chauffe-eau électriques à miniréservoir
Calentadores de Agua Eléctrico de Minitanque
Table of contents
1. Introduction……………………………………………………………………………………………1
1.1 Important safety instructions……………………………………………………………………………1
1.2 General remarks
………………………………………………………………………………………3
1.3 Installation instructions
……………………………………………………………………………… 3
1.4 Instructions for use
…………………………………………………………………………………… 5
2. Maintenance instructions……………………………………………………………………………5
2.1 Periodic Maintenance…………………………………………………………………………………6
2.2 Troubleshooting
………………………………………………………………………………………7
3. Limited Lifetime Warranty…………………………………………………………………………10
3.1 Coverage……………………………………………………………………………………………10
3.2 Warranty Period
10
3.3 Terms and Conditions
10
3.4 Warranty service process
…………………………………………………………………………… 10
HAZARD SYMBOLS AND DEFINITIONS
DANGER
WARNING
CAUTION
Danger Sign: Indicates a hazardous situation which, if not avoided, will result in serious injury or death.
Warning Sign: Indicates a hazardous situation which, if not avoided, could result in serious injury or death.
Caution Sign: Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury or
property damage.
1. INTRODUCTION
1.1 IMPORTANT SAFETY INSTRUCTIONS
WARNING
SAVE THESE INSTRUCTIONS
Technical data
WARNING
Hot water outlet 1/2 NPT male
3/4 NPT female tapping for
relief valve
FIG. 1/1
Temperature & pressure relief valve,
3/4 NPT male
Cold water inlet 1/2 NPT male
Temperature & pressure relief
valve discharge line to drain
NTI COMPACT 2.5 - NTI COMPACT 4
Tank capacity 2.7 gal 4.0 gal 7.0 gal *
Dimensions
13¾ ” W x 13¾ ” H x 10¾ ” D 13¾ ” W x 13¾ ” H x 13½ ”D 17⅗ ” W x 17⅗ ” H x 14½ ” D
Weight (empty) 15.5 lbs 17.3 lbs 29.5 lbs
Maximum Water pressure 150 psi 150 psi 150 psi
Recovery rate at 90°F rise 6.8 gal/h 6.8 gal/h 6.8 gal/h
Temperature range 65 – 145 °F 65 – 145 °F 65 – 145 °F
Water connections ½
” NPT ½ ” NPT ¾ ” NPT
Relief valve Installed Installed Included
Nominal Voltage (1 phase) 110/120 Vac 110/120 Vac 110/120 Vac
Nominal current 12 A 12 A 12 A
Power at 120 Vac 1,440 W 1,440 W 1,440 W
Electrical connection Plug-in Plug-in Hard wired
MODEL NTI COMPACT 2.5 NTI COMPACT 4 NTI COMPACT 6
* 5.1 gal if installed vertical
When using electrical appliances, safety precautions to reduce the risk of fire, electric shock or injury to persons should be followed,
including:
1. READ ALL INSTRUCTIONS BEFORE USING THIS WATER HEATER.
2. This water heater must be grounded. Connect only to properly grounded outlet. See “GROUNDING INSTRUCTIONS” found on
“INSTALLATION INSTRUCTIONS”.
3 .Install or locate this water heater only in accordance with the provided installation instructions.
4. Use this water heater only for its intended use as described in this manual.
5. The models NTI COMPACT 2.5 and NTI COMPACT 4 come equipped with a power cord. Do not use an extension cord. If no
outlet is available adjacent to the water heater, contact a qualified electrician to have one properly installed near the heater. The
model NTI COMPACT 6 must be hard-wired. See installation instructions.
6. As with any appliance, close supervision is necessary when used by children.
7. Do not operate this water heater if it is has a damaged cord or plug, if it is not working properly, or if it has been damaged or
dropped.
8. This water heater should be serviced only by qualified service personnel. Contact a service person for examination, repair or
adjustment.
9. Failure to inspect the anode rod at least once a year could cause the tank to fail and leak. This condition is not covered under the
manufacturer's warranty.
10.Any water heater should be installed in such a manner that if it should leak, the resulting flow of water will not cause damage to
the area in which it is installed.National Plumbing codes require a drain pan for any water heater installation. Failure to install one
is the sole responsibility of owner and/or installer. Reference UPC 2000 (Uniform Plumbing Code) Section 510 - Protection from
Damage or IPC 200 (International Plumbing Code) Section 504- Safety Devices.
The installer should review the contents of this manual with the owner upon completion of installation, and the manual should be
left with the owner and placed in a location close to the installation.
1
Temperature & pressure
relief valve, 3/4 NPT male
3/4 NPT female tapping
for relief valve
3/4 NPT female tapping for tap
NTI COMPACT 6 (HORIZONTAL INSTALLATION)
FIG. 1/2
Temperature & pressure relief
valve discharge line to drain
Hot water outlet 3/4 NPT male
3/4 NPT male plug
Cold water inlet 3/4 NPT male
Temperature & pressure relief
valve, 3/4 NPT male
3/4 NPT female tapping for tap
3/4 NPT female tapping for
relief valve
NTI COMPACT 6 (VERTICAL INSTALLATION)
FIG. 1/3
Hot water outlet 3/4 NPT male
3/4 NPT male
Temperature & pressure relief
valve discharge line to drain
Cold water inlet
3/4 NPT male
FIG. 2/1
DIMENSIONS FOR NTI COMPACT 2.5 - NTI COMPACT 4
13 3/4”
10 3/4”
13 1/2”
9”
3 1/2”
6 1/4”
3 1/2”
1”
13 3/4”
5 3/8”
3 3/4”
2 1/2”
1/2 NPT MALE
12 1/4”
DIMENSIONS FOR NTI COMPACT6 (HORIZONTAL INSTALLATION)
FIG. 2/2
14 1/2”
8 1/2”
4 1/2”
17.6” 1”
17.6”
11.4”
3/4 NPT MALE
3”
NTI COMPACT 2.5
NTI COMPACT 4
2
CAUTION
CAUTION
CAUTION
CAUTION
1.3 INSTALLATION INSTRUCTIONS
MODEL NTI COMPACT 2.5 - NTI COMPACT 4 - NTI COMPACT 6
The NTI COMPACT 2.5 and NTI COMPACT 4 water heaters can be installed under the sink.
Fasten the supplied mounting bracket to the wall. Use screws that are suitable for the wall material and the weight of the heater.
Hang the water heater on the bracket. Tug down wards on the heater to ensure that both “fingers” of the bracket are seated in the
mounting slots.
Wall mounting
CAUTION
CAUTION
FIG. 2/4
DIMENSIONS FOR NTI COMPACT6 (VERTICAL INSTALLATION)
FIG. 2/3
14 1/2”
8 1/2”
4 1/2”
11.4”
17.6”
17.6”
1”
3/4 NPT MALE
2 1/2”
6 1/2”
Prior to connecting the power supply, ensure tank is full of water and system is purged of air.
The manufacturer cannot be responsible for the damages caused by improper installation or by failure to follow instructions in this
manual. Comply with the installation instructions before completing electric connection.
The NTI COMPACT 2.5, NTI COMPACT 4, NTI COMPACT6 models are only approved for installations in USA.
The thermostat has been pre-set at the factory at a temperature:
- Equal or below 51.7°C (125° F) for NTI COMPACT 2.5, NTI COMPACT 4 and NTI COMPACT 6 for USA with UL certification
(See fig. 2/4).
Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally 2 weeks or more). Hydrogen gas is extremely flammable. To reduce the risk of injury under these conditions, it is recommen
ded 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 gas is present, there will probably be an unusual sound such as air escaping through the pipe as
the water begins to flow. There should be no smoking or open flame near the faucet at the time.
Any water heater should be installed in such a manner that if it should leak, the resulting flow of water will not cause damage to the
area in which it is installed. National Plumbing codes require a drain pan for any water heater installation. Failure to install one is
the sole responsibility of owner and/or installer. Reference UPC 2000 (Uniform Plumbing Code) Section 510- Protection from
Damage or IPC 2000 (International Plumbing Code) Section 504- Safety Devices.
1.2 GENERAL REMARKS
3
Figure BFigure A
Conduit
Junction
box
covers
White wire
Black wire
Earth connection
(Green wire)
Heater can sit on floor.
Connect the cold water inlet pipe to the inlet tapping (marked with a blue ring) and the hot water outlet pipe to the outlet tapping
(marked with a red ring).
The model NTI COMPACT 6 can be piped horizontally from the side or vertically from the top. If you wish to install the unit horizontally, with the piping connections on the right side, you will have to be certain the tap between the two water tappings is
plugged, the supplied Temperature and Pressure Relief Valve will need to be installed on top. See location of T&P relief valve in Fig.
2/2. If you wish to install the unit vertically, with the piping connections on top, you will have to be certain the tap on the side is
plugged, the supplied Temperature and Pressure Relief Valve will need to be installed on top. See location of T&P relief valve in
Fig. 2/3.
To reduce the risk of excessive pressures and temperatures in this water heater, install the supplied temperature and pressure
protective equipment required by local codes but not less than a combination temperature and pressure relief valve 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. The supplied
temperature and pressure relief valve is marked with a maximum set pressure (150 psi) that does not exceed the marked
maximum working pressure of the water heater. Install the valve in the opening provided and marked for this purpose in the
water heater, and orient it or provide tubing so that any discharge from the valve will exit within 6 inches above, or at any
distance below, the structural floor,and cannot contact any live electrical part. The discharge opening must not be blocked or
reduced in size under any circumstances.
National Plumbing codes require a drain pan for any water heater installation. Failure to install one is the sole responsibility of owner
and/or installer. Reference UPC 2000 (Uniform Plumbing Code) Section 510- Protection from Damage or IPC 2000 (International
Plumbing Code) Section 504- Safety Devices.
The NTI COMPACT 6 model must be hard wired . As per the National Electric Code the NTI COMPACT 6 needs to be wired
with 12 GA. wire to a 20 amp branch circuit. Remove the junction box covers and feed wires, see Figure A and B. Insert 12 AWG
through conduit into junction box and secure with conduit strain relief (not supplied). Make appropriate wiring connections to the
water heater per the National Electric Code. The unit must be grounded with supplied grounding cable inside junction box. Secure
junction box cover once wiring connections have been made. When theNTI COMPACT 6 is not within sight of the electrical circuit
breakers, a circuit breaker lockout or additional local means of disconnection for all non grounded conductors must be provided that
is within sight of the appliance. [REF NEC 422.31]
Periodic discharge of the temperature and pressure relief valve or failure of the element gasket may be due to thermal expansion in
a closed water supply system. The water utility supply meter may contain a check valve, backflow preventer or water pressure
reducing valve which will create a closed water system. During the heating cycle of the water heater, the water expands causing
pressure inside the water heater to increase. The temperature and pressure relief valve may discharge hot water under these
conditions which results in a loss of energy and a build-up of lime on the relief valve seat.
To prevent this from happening, there are two recommendations:
1. Install a diaphragm-type expansion tank that is suitable for potable water on the cold water supply line. The expansion tank must
have a minimum capacity of 1.5 U.S. gallons for every 50 gallons of stored water.
2. Install a 125 PSI pressure relief valve in the cold water supply line. Make sure the discharge of this valve is directed to an open
drain and protected from freezing. Contact the local water supplier or plumbing inspector for information on how to control this
situation. Do not plug the temperature and pressure relief valve.
Floor Mounting
Pipe connections
CAUTION
Electrical connection
Closed system thermal expansion (for all models)
4
DO NOT supply power to water heater until filled with water. Open supply valve for water heater to fill with water. Open hot
water tap(s) supplied by the water heater to purge air out of the system. Once air is purged, close hot water tap. Visually check
for any leaks.Supply power to the water heater by plugging in the power cord (models NTI COMPACT 2.5, NTI COMPACT 4) or
turning on the circuit breaker (model NTI COMPACT 6). If the light does not come on, turn the control knob in a clockwise
direction. The light will come on until water temperature has reached the thermostat temperature setting. The light will come back
on any time the water temperature inside the tank drops below the thermostat
setting.
The temperature of the hot water is adjusted by rotating the knob M (fig.3/1) located on the front cover. Turn the knob clockwise to
increase temperature. Turn the knob counter-clockwise to decrease temperature.
1.4 INSTRUCTIONS FOR USE
Starting and testing
Temperature Setting
2. MAINTENANCE INSTRUCTIONS
Note: Do not attempt to repair this water heater yourself. Call a service person for assistance. Always turn off the power supply to
the heater prior to servicing or draining the heater.
FIG. 3/2
G
H
E
A
Z
F
X
Y
T
FIG. 4
B
FIG. 3/1
V
C
M
W
5
Note: For most of these operations, the water will have to be drained from the heater. For all of these operations the cord
should be disconnected and the front cover removed.
1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with a small flat-head screwdriver.
2. Remove the Phillips screw revealed beneath the round cover plate.
3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When reassembling, work in the opposite
way being careful to insert the tongue of the cover into the slot.
1) If the heater has been installed with flexible hoses, shut off the power supply and turn the heater upside down over a sink to
drain the water out of it, OR
2) If the heater has been installed with rigid piping, siphon the water out through any (lower) service valve on the (inlet side). Keep a
hot water faucet open while siphoning the water out, OR
3) If the heater has been installed with flexible hoses, it can also be emptied by siphoning through the inlet side hose. Keep a hot
water faucet open while siphoning.
1. Turn off power supply and drain the heater (see previous section).
2. Remove the front cover plate, disconnect terminals X, Y and T (fig. 3/2).
3. Unscrew the 4 heating element retaining nuts F (fig. 3/2).
4. Remove the element. G (fig. 5/1).
The purpose of the anode rod (N Fig. 5/2) is to protect the tank against corrosion. It is critical that the anode rod be inspected
once a year to determine whether it requires replacement. To access the anode rod, the heating element must be removed (see
Section Removing the heating element). Upon inspection, the anode rod surface should appear smooth. If the rod surface appears
pitted, bumpy, rusty, or if the rod is missing completely, then it must be replaced.
For original anode rod sizes:
• NTI COMPACT 2.5, NTI COMPACT 4: length 6 _”, diameter 5/8”
• NTI COMPACT 6: length 8 _”, diameter 5/8”
Certain installations may require more frequent replacement of the anode rod:
• recirculation applications;
• poor water quality;
• galvanic/electrolytic corrosion
• High flow applications
Rusty water is usually an indication that the anode rod requires replacement. If rusty water is present, examine the anode rod
immediately and replace as needed. In the event of poor water quality, we recommend consulting a local water treatment
professional for water treatment options. Always ensure the water heater is grounded. Damage resulting from failure to replace
the anode rod is not covered under the manufacturer’s warranty. For additional questions, please call Bosch Technical Service.
To change the anode road:
1. Turn off the power supply and drain the heater (see Draining the Heater).
2. Remove heating element (see previous section).
3. Remove and replace the anode rod N Fig. 5/2.
4. Refill tank with water before restoring power.
2.1 PERIODIC MAINTENANCE
Removing the cover
Draining the Heater
Removing the heating element
Inspecting the anode rod
G
FIG. 5/1
N
FIG. 5/2
6
Scale deposits can affect the heating capability of the element.Heavy scale can even cause the element to burn out. The element
can be descaled either chemically or manually:
A) Soak the element in white vinegar or other descaling solution. Once descaled, rinse well with fresh water, to which you should
add some baking soda, OR
B) Once the element has dried up, use a soft brush (non metallic to prevent damaging the stainless steel sheath) on element. Brush
the dried mineral off. Reinstall the element with gasket and make the wire connections.
C) Replace anode rod (N Fig. 5/2) if it is noticeably deteriorated or considerably shorter then seen in figure 5/2.
WARNING: make sure the tank has been refilled with water before restoring power.
1. Turn off power supply and drain the heater (see Draining the Heater).
2. Remove the heating element (see section on Removing the Heating Element).
3. Install new element with gasket, making sure the gasket and element are positioned correctly. Tighten the retaining nuts and
make the wire connections. Ensure that the thermostat temperature sensor is inserted into the well located on the element
assembly and secured with black rubber grommet.
4. Refill tank with water before restoring power.
1. Turn off power supply.
2. Disconnect the 2 wire connectors on thermostat.
3. Loosen the two brass screws at right side of thermostat and pull wires out.
4. Unscrew and remove the two phillips screws holding the thermostat onto the tank.
5. Install new thermostat and re-attach wiring and screws. Ensure that the thermostat temperature sensor is inserted into the well
located on the element assembly and secured with black rubber grommet.
Occasionally, the high temperature limit shut off device may trip the reset. This occurs when water temperature exceeds
190° F. The shut off device may also trigger from a power outage or electrical storm.
To reach the thermostat:
1. Disconnect power cord and remove the front cover. Firmly press reset button (B Fig. 4) with the tip of a ball point pen or similar
object. A click indicates the reset was tripped. Reconnect power
2. IMPORTANT: Check the operation of the thermostat, turn temperature dial from high to low, if the red light does not go off on low
setting, turn off power supply and call a service person to replace the thermostat
3. If the system works, place dial setting to desired setting. Note: a lower setting is more economical and reduces the risk of scalding.
Replace cover plate.
CAUTION : Call a technician if the high limit need to be reset frequently.
1. Make sure the power supply is on and working.
2. If light does not come on, check that the high limit reset button is pushed in; follow steps above.
3. If the indicator light works properly but temperature does not get hot at the tap, test for a plumbing crossover; shut off cold supply to heater
and open hot water tap. There should be no water flowing. Any continued flow indicates a crossover which will effect the temperature
and will need to be corrected.
4. Call a qualified service technician to test the resistance of the heating element (8-10 ohms). Heating element should be replaced
if readings are outside these values.
1. If the light does not come on, but water gets hot, check for faulty bulb.
2. Check that the high limit reset button is pushed in; follow steps above.
1. Brown or rusty water indicates a “spent” anode rod and possible deterioration of the tank body. Inspect the tank for leaks.
1. Smelly water could be due to an unusual reaction between local water and the heater’s anode rod. Check anode rod (see section on
Inspecting the anode rod). Failure to do so may result in damage to the tank and leaks.
Descaling the heating element
REPLACEMENT OF PARTS
Changing the heating element
Changing the thermostat
2.2 TROUBLESHOOTING
Reset ting High Limit Switch
Water does not get hot
Light not on
Brown water
Odor in water
7
Leaking
1. Check water fitting and T&P fitting on top of tank
2. Remove front cover and inspect heating gasket
3. If tank is leaking call NY Thermal Inc. TI for warranty claim if still within warranty period.
8
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