SSI Series - Clean My Water

Installation Manual & Operating Instructions
Indirect Fired Water Heaters
SSI Series
SSI 803
Congratulations on your purchase of an H2Pro SSI Series indirect fired water heater. Please read and understand
these instructions completely before attempting installation or service of the product. Retain this booklet for future
reference. Please pay particular attention to the warnings on the product and in this booklet.
Notice to Homeowners:
The H2Pro SSI Series indirect fired water heater has been engineered to give abundant hot water when properly
sized and installed. It should be installed and serviced by a qualified professional. If you experience problems,
please notify the installing contractor.
This is the safety alert symbol. It is used throughout this booklet to notify you of personal
injury hazards. Obey all safety instructions to reduce the risk of personal injury or death
as well as to avoid the potential for property damage.
300 Pond St
Randolph, MA 02368
www.flexconind.com
620.0030

H2Pro Indirect Fired Water Heater
Specifications
SSI Series
Cutaway View
Floor to
Recommended
Capacity Boiler Boiler Domestic Domestic Flow Rate 180 o Boiler 200 o Boiler
Model Gallons Height Diameter Supply Return Out Connections (GPM) BTUH BTUH
SSI 300 30 39.5” 19.25” 9” 4.5” 34” 3/4” MNPT 8 102,000 117,000
SSI 450 45 52.5” 19.25” 9” 4.5” 46” 3/4” MNPT 10 141,000 161,000
SSI 600 60 52.5” 23.25” 9” 4.5” 46” 1” MNPT 10 174,000 198,000
SSI 800 80 72” 23.25” 9” 6” 69.25” 1 1/2”MNPT 12 212,000 241,000
SSI 1200 119 73.5” 27” 10.25” 7.25” 66” 1 1/2”MNPT 14 269,000 301,000
Maximum Working Pressure: 150 PSI Test Pressure: 300 PSI
First Draw Ratings
First draw in minutes at 140 o F. For performance at 115 o F, multiply by 1.56 for minutes of water draw.
A. Less than 90 seconds for boiler to heat up to temperature.
B. More than 90 seconds for boiler to heat up to temperature.
Based on boiler size conforming to recommended output as noted in the chart above.
Model 2 GPM 2.5 GPM 3 GPM 4 GPM 5 GPM
A 16 minutes 13 minutes 10 minutes 6 minutes 5 minutes
SSI 300 B 14 minutes 12 minutes 9 minutes 5.5 minutes 4.5 minutes
A 23 minutes 18 minutes 14 minutes 8.5 minutes 7 minutes
SSI 450 B 18 minutes 15 minutes 13 minutes 7.5 minutes 6.5 minutes
A 36 minutes 22 minutes
SSI 600 B 29 minutes 12 minutes
Note: First draw ratings on SSI 800 & 1200 are unlimited at above flow rates.
H2Pro Indirect Fired Water Heater
Site Preparation
THIS PRODUCT MUST BE INSTALLED ACCORDING TO ALL NATIONAL AND LOCAL
PLUMBING AND ELECTRICAL CODES. IT MUST BE INSTALLED BY A LICENSED
PLUMBER AND ELECTRICIAN.
This product is certified as an indoor appliance and must not be installed outdoors. Choose a location that is close to the piping system,
and not exposed to freezing temperatures. This water heater must be kept vertical and on a level surface. The controls, drain and inlet &
outlet piping should be easily accessible. Do not install this product in an area where leakage from the relief valve, related piping or the
tank itself could cause property damage. A water heater should always be installed in an area with a floor drain or installed in a water
heater drip pan. Flexcon Industries is not liable for any water damage that may occor in connection with this product or the associated
piping.
THIS WATER HEATER MUST NOT BE LOCATED NEAR FLAMMABLE LIQUIDS SUCH AS
GASOLINE, ADHESIVES, SOLVENTS, PAINT THINNERS, BUTANE, LIQUEFIED
PROPANE, ETC, AS THE CONTROLS OF THIS APPLIANCE COULD IGNITE THOSE
VAPORS CAUSING AN EXPLOSION.

H2Pro Indirect Fired Water Heater
System Operation
A temperature setting of 119 o F, or in accordance with local and state codes, is recommended for normal system operation. You may prefer
a setting that is higher or lower depending on your system requirements. If the setting is to be higher than 119 o F, use a mixing valve
to regulate the water temperature to the fixtures.
The boiler high limit control should be set at least 20 o F higher than the water heater control setting. The boiler low limit should be set to
the lowest setting to maximize system efficiency. This will call the burner on only to satisfy the tank control The boiler control
differential should be in the 10 o to 15 o range.
RISK OF SCALD INJURY INCREASES AS YOU INCREASE WATER TEMPERATURE! IF
DRAINING OF THE WATER HEATER IS REQUIRED, OPEN THE T&P VALVE OR A HOT
WATER TAP TO PREVENT VACUUM BUILDUP IN THE TANK AND PIPING.
WATER TEMPERATURE OVER 125 o F CAN CAUSE SEVERE BURNS INSTANTLY, OR EVEN
DEATH FROM SCALDS. CHILDREN, DISABLED, AND ELDERLY ARE AT THE HIGHEST
RISK OF BEING SCALDED. REFER TO INSTRUCTION MANUAL FOR PROPER TEMPER-
ATURE SETTINGS. FEEL WATER BEFORE BATHING OR SHOWERING.
TEMPERATURE LIMITING VALVES ARE AVAILABLE.
H2Pro Indirect Fired Water Heater
Boiler Piping
THIS PRODUCT MUST BE INSTALLED ACCORDING TO ALL NATIONAL AND LOCAL
PLUMBING AND ELECTRICAL CODES. IT MUST BE INSTALLED BY A LICENSED
PLUMBER AND ELECTRICIAN.
Boiler Connections
Use a 1” nominal or larger tube size when connecting tbe boiler piping to the water heater. When using zone valves, a 1” or larger zone
valve is required.
Connect the boiler supply on the tank to the outlet piping of the system circulator or zone valve. When using a circulator, it must be
connected to the HOT Outlet side of the boiler. Make sure that the flow arrow on the circulator is pointing in the proper direction..
(See pressure drop sizing chart for proper circulator selection).
Connect the boiler return on the tank to the return side of the boiler. A flow check or swing check should be installed in this return line
to the boiler.
If connected to a steam boiler, the tank supply and return must be well below the minimum water level of the boiler. A strainer and
drain valve should be installed for periodic cleaning of scale and sludge. The system will not function properly if the the boiler water
supplied has steam or is slightly above the low water cut-out.
Do not use live steam in this water heater!
DO NOT USE DIELECTRIC UNIONS OR GALVANIZED STEEL FITTINGS ON ANY
DOMESTIC WATER CONNECTIONS. USE ONLY BRASS OR COPPER FITTINGS.
TEFLON THREAD SEALANT OR PIPE DOPE MUST BE USED ON ALL CONNECTIONS
SSI Indirect with Circulators
Installation Diagram

H2Pro Indirect Fired Water Heater
Note: All piping, fittings and connections must conform to national and local
codes. Make sure that these connections are leak free. This system should be
installed in an area where a water leak will not cause property damage.
Cold Water Inlet
Install a brass NPT tee on the incoming cold water line. On the run, install a brass drain valve. In the branch, install an NPT male x
3/4” (minimum) tube adapter and connect it to the tank’s cold water inlet.
Refer to the piping diagram for further information. A shut-off valve between the main water supply and the water heater is recommended
for ease of service at a later date.
If the tank is replacing a tankless coil in the boiler, disconnect the coil plumbing and use the cold inlet pipe and hot water pipe for the
new water heater. DO NOT PLUG THE TUBE OUTLET IN THE TANKLESS COIL.
If a mixing valve is required, refer to the piping diagram below for proper installation.
A backflow preventer or no return valve may be required. Check your local plumbing code. If such a valve is installed, a
thermal expansion tank must be installed in the cold water supply piping between the water heater and the backflow or no
return valve. Refer to piping diagram for further information.
H2Pro Indirect Fired Water Heater
Cold Water Piping
Hot Water Piping
Domestic Hot Water Outlet
Install a brass NPT tee. On the run, install a brass NPT Temperature and Pressure (T&P) relief valve, long element for hot water storage
tanks. Refer to local codes., and make sure that the relief valve is sized to the BTU/hour capacity and storage capacity of the water
heater. The T&P valve must be plumbed down so the discharge can exit only 6” above, or at any distance below the structural floor, and
can not contact any live electrical parts.
Refer to piping diagram for further information.
The T&P valve is designed to relief pressure build-up in the water heater and may discharge water.
Make sure the water heater is installed in, and the T&P valve is piped to, an area where water discharge
or leaking will not cause property damage.
WHEN FILLING THE WATER HEATER, BE CERTAIN TO OPEN A HOT
WATER TAP TO RELEASE AIR IN THE TANK AND PIPING.
H2Pro Indirect Fired Water Heater
Expansion Tank
When a backflow preventer or no return valve is utilized, a properly sized thermal expansion tank must be installed. This tank is
designed to accept the thermal expansion of stored water as the temperature increases. It maintains safe and proper pressure in the piping
system and prevents unneccessary and nuisance cycling of the T&P valve. Refer to sizing chart for proper selection.
Mixing
Valve
Installation
Thermal Expansion Tank Installation

H2Pro Indirect Fired Water Heater
Controls
Install the control element into the well on the tank and tighten in place with the screws on the control body. Thermal paste is recommended,
but is not required or provided.
H2Pro Indirect Fired Water Heater
Wiring
All wiring is to be done in accordance with all applicable local, state and national electrical codes.
This work must be done by a licenced professional.
Turn off all power to the boiler before beginning wiring procedures. Refer to wiring diagrams for proper wiring. It is recommended
that a disconnect switch be installed between the boiler control and the water heater.
H2Pro Indirect Fired Water Heater
Circulator Sizing
In order to achieve published capacity ratings, the tank circulator must be capable of delivering the required
flow rate AND overcome the resistance in the system piping and tank coil. The pressure drop chart below
includes the piping run and indirect water heater only. The pressure drop from flow checks and zone valves
must be added to the values listed to determine final circulator sizing.
Piping Run Length
GPM 20’ 30’ 40’ 50’ 60’
6 8.6’ 8.9’ 9.2’ 9.5’ 9.8’
8 11.3’ 11.8’ 12.3’ 12.7’ 13.1’
10 10.3’ 11.1’ 12.0’ 12.8’ 13.7’
12 11.3’ 13.2’ 14.1’ 15.0’ 16.0’
14 15.3’ 16.4’ 17.5’ 18.6’ 19.8’
Chart at left represents
the pressure drop
through the specified
length of 1” copper
tubing PLUS (6) 90
degree elbows and (1)
tee on the run.
H2Pro Indirect Fired Water Heater
Wiring Diagrams
Zone Valves
Circulator
Please consult the factory for additional wiring diagrams.

H2Pro Indirect Fired Water Heater
Troubleshooting
Make sure the power supply is turned off when servicing the SSI Series Indirect Fired Water Heater.
If draining the tank of water, be sure to open a hot water tap in the system to prevent vacuum build
up in the tank.
PROBLEM POSSIBLE CAUSES POSSIBLE SOLUTIONS
NO HOT WATER
Zone Valve not opening
Open manually to check, replace if
neccessary
Circulator not operating
Check operation and replace if neccessary
Tank Control too low
Raise tank temperature (**see note below)
Boiler control too low
Refer to page 2 for proper setting of boiler
control
Wiring incorrect
Refer to wiring diagram
Tank control failure
Replace control
Air trapped in piping
Purge air to remove
NOT ENOUGH HOT WATER
Supply piping undersized
Circulator arrow reversed
Tank temperature too low
Boiler temperature too low
Boiler too small
Demand flow rate too high
Circulator too small
T&P VALVE DISCHARGES
Tank temperature too high
Thermal expansion
Water pressure too high
Boiler feed and return should be a minimum
` of 1`”
Reverse flow
Raise setting (**see note below)
Refer to page 2 for proper setting of boiler
control
Refer to page 2 for minimum sizing
requirements
Refer to page 2 for flow rates.
Install mixing valve and raise tank temperature (**see
note below)
Install flow regulator
Add storage capacity
Replace
Lower temperature on tank control
Install thermal expansion tank
Install pressure reducing valve
WATER TEMPERATURE OVER 125 o F CAN CAUSE SEVERE BURNS INSTANTLY, OR EVEN
DEATH FROM SCALDS. CHILDREN, DISABLED, AND ELDERLY ARE AT THE HIGHEST
RISK OF BEING SCALDED. REFER TO INSTRUCTION MANUAL FOR PROPER TEMPER-
ATURE SETTINGS FEEL WATER BEFORE BATHING OR SHOWERING. TEMPERATURE
LIMITING VALVES ARE AVAILABLE.
H2Pro Indirect Fired Water Heater
The SSI Series Indirect should be inspected annually by a qualified professional. Check controls, piping, wiring and operation of the
T&P valve. Tank may be drained to remove any accumulated debris. Refer to these instructions for proper procedures.
Service Record
Date Serviced by Maintenance performed
Maintenance
300 Pond St
Randolph, MA 02368
www.flexconind.com