iFlow iFLH-140000 User manual

iNTELLIGENT SMART IoT TECHNOLOGIES
iFLOW HYDRONIC AIR HANDLER
NEW GENERATION OF HEATING & COOLING
iFLOW MANUAL A2
www.iflowhvac.com
iFLOW HVAC INC.

iFLOW HVAC INC. www.iflowhvac.com 1
Table of Contents
Introduction
Safety ………………………………………………………………………………………………………….… 2
Summary of air handler ………………………..………………………………………………………………. 2
Technician checklist ……………………………………………………………………………………………. 2
Product Description
Components ………………………………………………………………...…………………………………3
Standard features and benefits ………………………………………………………………………….…..4
Equipment selection and sizing ………………………………………………………………………….….. 5
Suitable Applications (Choosing the correct heat source) ………………………………………………… 5
Installation
Location requirements and clearances ………………………………………………………….…….. 8
Dimensions …………………………………………………………………………………………….……. 8
Installation examples ………………………………………………………………………………………… 9
Boiler Piping …………………………………………………………………………………………………… 9
Domestic Piping ………………………………………………………………………………………….…. 9
Electrical requirements and making connections ………………………………………………………. 10
Temperature sensors ………………………………………………………………………………………… 10
A/C Evaporator Coil Freeze Protection and the Importance of Wiring the A/C Compressor to
the Proper and Dedicated A/C Connector on the iFLOW PCB.…………………………......................... 11
Start-Up
Procedure ……………………………………………………………………………………………………. 13
Flushing the heat exchanger ……………………………………………………………………………….. 13
Sequence of operation………………………………………………………………………………………… 13
Service and Maintenance
Maintenance ………………………………………………………………………………………………...... 17
Checking temperature sensors …………………………………………………………………………….. 17
Wiring Diagram ………………………………………………………………………………………………. 18
A2 Field Wiring ……………………………………………………………………………………………… 19
iFLOW Set up and Wiring of an iFLOW with a Heat Pump ……………………………………………… 20
Troubleshooting
Fault Codes and Explanations ……………………………………………………………………………… 23
Problems and Solutions ……………………………………………………………..………………………. 24
Component Assembly Diagram and Parts Lists……………………………………………………… 25
Commonwealth Of Massachusetts Board Policy ......................................................... 34
Warranty
Warranty Information………………………………………………………………………………………… 35
Contact Information …………………………………………………………………………………………… 35

iFLOW HVAC INC. www.iflowhvac.com 2
WARNING
This Air Handler Unit (AHU) is not intended for installation in a
unconditioned space where the potential may exist for the water
and/or drain lines to freeze.
1. Introduction Safety
Ensure the instructions and requirements provided in this manual are
read and understood before installation. Failure to comply with these
instructions can cause product and property damage, serious injury
or death.
Pay attention to the following safety symbols and words:
DANGER
Indicates an imminently hazardous situation, which if not
avoided, will result in death or serious injury.
WARNING
This product can expose you to chemicals including lead,
lead compounds, and carbon bisulfide which are known to the
State of California to cause cancer and birth defects or other
reproductive harm. For more information, go to
www.P65Warnings.ca.gov.
CAUTION
Indicated a potentially hazardous situation, which if not
avoided, may result in minor or moderate injury. It is also used
to alert against unsafe practices and hazards involving property
damage.
• Be sure to bleed all air from all system components and piping prior
to start-up.
• It is recommended to install purge valves between the air handler
and water heater’s isolation valves.
• If connected to domestic piping creating an open system, make
sure all piping, components, and solder are lead-free and approved
for potable-use.
CAUTION
Return air openning shall not be installed
on the back side of unit.
IMPORTANT
The maximum ambient temperature must
not exceed 122℉ (50℃)
• Ensure fan assembly is clear of any obstruction
• Check that air filter is installed upstream of air conditioning coil.
• If the appliance is installed with air conditioning,the A/C refrigerant
charge and system operation must be verified by a certified/ licensed
mechanic prior to commissioning.
2. Summary of air handler
The iFLOW hydronic air handlers are designed to deliver the highest
performance rating of any air handler regardless of the hot water
source. This unique hydronic furnace is built for use in residential and
commercial applications.
CAUTION
The air handler must be installed such that electrical components
are away from water (spraying, splashing, etc.) during operation and
service.
IMPORTANT
A field fabricated auxiliary drain pan with a drain pipe connection is
recommended in all configurations.
Introduction
3. Installer’s checklist

iFLOW HVAC INC. www.iflowhvac.com 3
Water Outlet Temp.
Cabinet:
All cabinets are made of high quality, and durable heavy gauge
galvanized steel. The inside of the cabinet is fully insulated with ½”
polyethylene sheets. This prevents moisture and mold growth, as well
as unwanted heat loss due to an R-Value. The smaller cabinet size
and shape is designed to maximize installation flexibility.
Heating Coils:
All iFLOW heating coils are constructed of potable, water-grade
copper for use in plumbing systems. Lead-Free solder has been used
for assembly on all components. All coils and internal piping conform
to ASTM B-68, ASTM B-88 and/or B-743 standards. Carefully
engineered, high-density aluminium fins allow for maximum heat
transfer across smaller coils. This provides warmer, more comfortable
heating with lower air flow for minimal operating noise.
Fan Motor:
All iFLOW air handlers are equipped with variable speed ECM
motors. This allows for separate heating, cooling, and continuous run
speeds. They reduce electrical-use and are dynamically balanced
for extra quiet operation. Blowers are mounted with four screws on
rails for easy removal and service. Multi-directional motors allow for
mounting in any direction.
Circulating Pump:
All air handlers require a field supplied single speed or 3-speed pump,
to be controlled by the iFLOW circulator control. This the speed of the
pump increases or decreases depending on the information provided
by the temperature sensors. The pump also provides maximum
performance when used in conjunction with an instantaneous water
heater or a storage-type water heater.
Check Valve:
A spring-loaded check valve must be installed either with the field-
supplied pump or externally to prevent the by passing of water to the
appliance.
Multi-Function Control Board:
This intelligent control board comes factory installed. No dip
switches are required or included with the iFLOW control board.
Easy programming allows for user-friendly startup and service/
maintenance. Some of the parameters the user is able to configure
are: heating output, CFM for heating, cooling and continuous low-
speed fan, outdoor design temperature and circulating pump speed.
Product Description
Water Inlet Temp.
Supply Air Temp. Sensor
Supply Water Temp. Sensor
Transformer AC24V
Blower Assembly Bracket
Main Control
Blower Assemble
Dehumidifier Eva. Temp. Sensor
(Option)
Humidity Sensor
A/C Evap. Air Temp. Sensor
Heat Exchanger Ass'y
(Hydronic Coil)
Return Water Temp. Sensor
Power Terminal
Return Air Temp. Sensor
Blower Motor
Motor Power Cable
Motor Control Cable

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2) Standard Features and Benefits:
• Highest performance at 98% efficiency (CAN/CAS P.9-11
Performance Ratings: TPF 0.98)
• Ultra-efficient heat-exchanger design with high-density aluminum
fins
• Offers installation flexibility allowing for up-flow, down-flow or
horizontal applications
• Cost effective and extremely quiet variable speed ECM fan motor /
constant CFM
• Slide-out blower rail assembly for easy maintenance & removal with
4 screws
• 6 fully modulating models: 3 ‘standard duct’ models (S, M, L) & 3
high-static pressure models (S, M, L)
• Easy installation: Lightweight, “one-man job” with Optional EZEE
Plumbing Kit
• Approved for potable water (‘open’) systems with buit-in anti-
stagnation and DHW priority included in the control board
• Air and water supply and return temperature sensors included
• Humidity sensor included for cooling fan speed modulation
• Freeze Protection/ Evaporator Temperature Sensor
• Outdoor temperture sensor included
• Intelligent iFLOW control board
• All models are compatible with mercury or digital thermostats
• Supports the use of two stage and inverter-driven variable speed
cooling equipment
• Accessories are controlled by AC24V power
• LED light indicates alarm, test mode and normal operation
• Auxiliary contacts (dry contact) for boiler or water heater activation
• Bottom or left or right side return air supply
• 0” clearance to combustibles
• Cabinet lined with 1/2” Polyethylene High-Density Insulation
• Cabinet manufactured with heavy gauge galvanized steel and
powder-coated to prevent corrosion
iNTELLIGENT PUMP CONTROL:
• Pump modulation control
• Low flow pump exercise function (Water Circulation / Seize
Protection)
• Low ambient freeze protection
iNTELLIGENT CONTROL:
• Boiler demand control
• Installer & user-friendly interface
• Informative display: error code, temperture, humidity, fan & pump
speed
• Easily configure all parameters smartphone App.
• 22 segment LED indicator / all input & output signals: built-in
programmable and diagnostic control display
• Outdoor reset function / outdoor temperature sensor
• Full modulation a single or two stage settings for heating & cooling
• Humidity control / humidity sensor
• ΔT auto-adjustment air and water (air and water flow control)
• Fan "ON" delay & Fan "OFF" heat purge control
• DHW priority & dual mode (heating and DHW)
• High & low limit safety control: air temperature sensor
• Home freeze protection: low ambient temperature sensor
• Evaporator freeze protection: compressor protection
• Virtual termostat mode with the smartphone app
• Smart zoning control (saving gas & hydro)
• Maximize heat pump performance / (AVOID) Peak Time AVOID
Electricity Function
• Hybrid heating system switching control and backup with heat pump
• Communication with NAVIEN Tankless Water Heater
OPTIONS:
• Multi-system central control for building HVAC systems
• Wi-Fi connection with a smartphone (Free app available on iOS and
Android)
• Remotely adjust and monitor operation through web integrated plug-
in control, or directly via a smartphone connection
• All-in-one package (EZEE plumbing kit and stand) for easy
Installation: iFLOW AHU with any TLWH/TWH
Freeze Protection:
iFLOW Air handlers include a freeze protection sensor that will
temporarily disable the outdoor condenser for 5 minutes if the
evaporator coil outlet temperature drops below 40°F/4°C. This will
allow the system to warm up and return back to normal operating
conditions.
To protect the hydronic heating coil from freezing, the pump will
operate for a minimum of 30 seconds. Dirty air filters, oversizing of A/
C equipment, improper A/C installation or poor duct design will also
play a role in the evaporator coil freezing.
Water Circulation / Pump Exercise:
In section 4.2.5.1 Prevention of Stagnation of the 'CAN/CSA-B214-12
Installation Code for Hydronic Heating Systems', it states: "a means
shall be provided to prevent the stagnation of potable water in a
hydronic system by recycling or flushing the contents not less than
once every 24 hours."
The iFLOW controller is defaultset to turn on the circulating pump to
cycle the total volume of potable water in the system, once every 24
hours. This will prevent stagnation and protect the pump from seizing.
There is a test button to verify that this operation is working. The
setting can be adjusted to circulate more frequently if desired.
Alarms:
In the event of a service problem (i.e. temperature sensor failure, low
ambient temperature, cooling lockout, etc.), the iFLOW air handler
will notify the user/owner with an audible alarm and red light. The
alarm on the control board can be silenced by turning the power off
for 5 seconds and then back on.

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Set Back Recovery:
If a programmable thermostat with setback is used or a sudden
increase in temperature is required, the iFLOW intelligent control
board will modulate the air handler to its maximum output to speed
temperature delivery. The next cycle will return to normal operation.
See "Heat Boost Delay" Parameter.
Test Mode:
Entering ‘test mode’ on the controller will allow the technician to test
the iFLOW air handler heating and cooling mode parameters. Once
completed, push the test button again to return to normal operation.
Heating:
The iFLOW air handler will automatically change the fan and pump
speeds to control the temperature output of the unit and cycle-time
length. This will allow the heat output of the air handler to match the
current heat loss of the home. Maximum ‘matching’ performance is
achieved when used in conjunction with the outdoor sensor. This
leads to a longer runtime, providing superior warmth and comfort.
Cooling/Dehumidifying:
The iFLOW air handler uses a modulating blower fan to regulate
humidity levels. The blower fan speed decreases in high humidity
to remove moisture quicker. The blower fan speed increases under
normal conditions to provide optimal cooling. The balance of the two
is always met. Optimal humidity levels result in increased comfort
for the homeowner, and at the same time reduces cooling loads and
operating costs.
3. Equipment selection and sizing
iFLOW air handlers are available in 3 models. Please use the
following charts to determine which best suits the application:
1. Obtain/calculate/determine a proper heat load for the home
2. Determine the inlet water temperature from water heater(or boilder)
3. Determine the duct layout/ available duct size
4. Be sure the system air flow rate matches the air flow rate of the
selected air handler
System Design Resource Note:
From the CAN/CSA-B214-12 Installation Code for Hydronic Heating
Systems, section 4.2.2.1 Heat-source output, it states: "the heat-
source output shall be not less than the heat load indicated in the
system design."
4.2.2.2 Dual-purpose water heater
Model No. Description
Model No. Description WiFi @ IoT Zoning Temperature
Control
iFLH-140000
iSmart
Control No No Room Thermostat
iFLH-160000
iFLH-180000
Model No. Description
Model No. Format
4. Suitable applications: Choosing the right heat source
The iFLOW air handler can be installed with various types of
heat sources and heating systems. The following are its primary
applications:
1. Air handler with tankless water heater
2. Air handler with conventional thank-type water heater
3. Air handler with heating boiler
4. Air handler with combi boiler
5. Air handler with heat pump + tankless water heater
6. Air handler with heat pump + tank-type water heater
7. Air handler with heat pump + boiler
8. Air handler with heat pump + combi boiler
Refer to the installation manual for diagrams of each type of installati-
on.
▶
i F L H - 1 4 0 0 0 0
Function / B: basic, W: WiFi,
D: 2 zone, Q: 4 zone
▶
▶Cabinet Size / 14 : 14", 16 : 16", 18 : 18" Width
Static Pressure / L : Low Static Pressure,
H: High Static Pressure, LH : Universal
▶Company Initial
Model No. Initial Size Function Initial
i F L H 14, 16, 18 B, W, D, Q, 0

iFLOW HVAC INC. www.iflowhvac.com 6
Description iFLH-140000 iFLH-160000 iFLH-180000
Heating
Capacity
@
Entering
Water
Temperature
120℉ 27,834 BTUH 34,211 BTUH 42,376 BTUH
130℉ 33,478 BTUH 41,357 BTUH 50,966 BTUH
140℉ 37,729 BTUH 48,379 BTUH 59,632 BTUH
150℉ 44,998 BTUH 55,485 BTUH 68,334 BTUH
160℉ 50,869 BTUH 62,632 BTUH 77,065 BTUH
170℉ 56,941 BTUH 69,769 BTUH 85,648 BTUH
180℉ 62,786 BTUH 76,982 BTUH 94,633 BTUH
Flow Rating LPM / GPM 11.4 / 3 11 / 2.9 10.6 / 2.8
Return Air Temp. ℃ / ℉ 22 / 72 22 / 72 22 / 72
E. S. P. inWC 0.6 / 1.2 0.6 / 1.6 0.6 / 1.6
Airflow SCFM 941 / 824 1222 / 1009 1423 / 1093
Cooling Capacity Ton 1 - 2 1.5 - 3 2 - 4
Cabinet Size
(W x D x H)
in 14 x 18 3/4 x 27 1/8 16 x 20 3/4 x 27 1/8 18 x 25 3/4 x 29 1/8
mm 356 x 476 x 689 406 x 527 x 689 457 x 654 x 740
Material Cold Roll Steel Sheet Metal / Powder Coated
Weight
kg 28.6 32 42
lb 63 71 92.5
Supply Air Opening
(W x D)
in 13 x 14 14 x 16 16 x 20
mm 330 x 356 356 x 406 406 x 508
Return Air Opening
(H x D)
in 12 x 16 13 x 18 14 x 23
mm 406 x 304 457 x 330 584 x 355
Electrical ACV/Hz/Ph AC 120V 60Hz 1Ph AC 120V 60Hz 1Ph AC 120V 60Hz 1Ph
Motor
HP 1 / 2 1 / 2 3 / 4
Type ECM Eon ECM Eon ECM Eon
W431 / 393 519 / 516 592
Piping Connection
Supply 3/4" Male NPT Thread / 1/2" Soldering Connection
Return 3/4" Male NPT Thread / 1/2" Soldering Connection
Hydronic Heating Coil Aluminum Ultra Efficiency Fins, Copper Tubing
Specification

iFLOW HVAC INC. www.iflowhvac.com 7
Water Heating Capacity (BTUH) / Water Pressure Drop (Feet)
iFLH-140000
H.Ex.
Rows
Entering
Water
Temp.
3 GPM 4 GPM
CFM
W.P.D
CFM
W.P.D
400 600 700 800 950 400 600 700 800 950
4
120℉ 17,365 21,756 23,654 25,347 27,834 2.9 18,425 23,097 25,653 27,246 29,906 4.3
130℉ 20,756 26,235 28,105 30,632 33,478 2.9 21,365 27,743 30,014 32,954 36,183 4.3
140℉ 24,142 30,754 33,521 36,065 37,729 2.8 24,845 32,469 35,478 38,549 42,376 4.2
150℉ 27,587 35,329 38,013 41,365 44,998 2.8 28,326 37,254 40,024 44,287 48,598 4.2
160℉ 30,965 39,865 43,247 46,759 50,869 2.8 31,824 41,987 45,726 49,976 54,843 4.1
170℉ 34,329 44,432 48,628 52,125 56,941 2.7 35,327 46,743 51,214 55,643 61,176 4.1
180℉ 37,734 49,032 54,573 57,683 62,786 2.7 39,836 51,458 56,429 61,398 67,497 4.0
iFLH-160000
H.Ex.
Rows
Entering
Water
Temp.
3 GPM 4 GPM
CFM
W.P.D
CFM
W.P.D
600 800 900 1000 1250 600 800 900 1000 1250
4
120℉ 24,625 27,865 29,865 31,087 34,211 3.7 28,268 30,042 31,986 34,109 38,287 5.7
130℉ 28,218 33,572 35,724 37,429 41,357 3.7 33,625 36,256 38,524 41,162 46,456 5.7
140℉ 32,865 39,218 41,625 43,843 48,379 3.7 38,245 42,367 45,412 48,235 53,971 5.5
150℉ 37,536 45,075 47,536 50,327 55,485 3.6 42,765 48,559 52,369 55,149 61,864 5.5
160℉ 42,125 50,732 53,425 56,798 62,632 3.6 47,325 54,632 58,489 62,268 69,832 5.4
170℉ 46,852 56,579 59,425 63,266 69,769 3.5 51,869 60,861 64,542 69,345 77,846 5.4
180℉ 51,425 62,329 65,325 69,747 76,982 3.5 56,465 67,054 72,369 76,486 85,742 5.3
iFLH-180000
H.Ex.
Rows
Entering
Water
Temp.
3 GPM 4 GPM
CFM
W.P.D
CFM
W.P.D
600 800 1000 1200 1450 600 800 1000 1200 1450
4
120℉ 28,963 34,245 35,648 38,946 42,376 5.6 30,125 36,203 38,224 42,376 46,638 6.9
130℉ 33,412 39,632 42,820 46,981 50,966 5.5 34,845 41,952 45,996 50,996 56,173 6.8
140℉ 37,954 45,126 50,157 54,844 59,632 5.5 39,652 47,623 53,756 59,465 65,789 6.7
150℉ 42,503 50,520 57,489 62,529 68,334 5.4 44,321 53,304 61,533 68,255 75,223 6.7
160℉ 47,127 55,963 64,732 70,931 77,065 5.3 49,032 59,123 69,325 76,905 84,896 6.6
170℉ 51,608 61,412 72,078 78,842 85,648 5.3 53,741 64,745 77,199 85,627 94,441 6.5
180℉ 56,129 66,846 79,354 87,055 94,633 5.2 58,429 70,487 84,923 94,336 104,056 6.4

iFLOW HVAC INC. www.iflowhvac.com 8
1) Location requirements and clearances:
• The installer shall comply with all local, state/provincial and national
code requirements that apply to the installation of this equipment.
• The air handler must be installed in such a way that electrical
components are protected from water during operation and service.
• If installed in an unconditioned space, sealant should be applied
around where the electrical wires, refrigerant tubing, and condensate
lines enter the cabinet. This appliance shall not be installed in a non-
conditioned space where the potential may exist for the appliance,
water lines and/or drain lines to freeze.
• If installed with air conditioning in a suspended application, ensure a
drain pan with a proper slope is installed.
Recommended Clearances:
Be sure to provide a minimum of 24” clearance to the front panel
of the iFLOW air handler. 0” clearance is allowed for all other sides
of the cabinet and for the first 36” of ductwork. Ensure adequate
clearance is left for the installation of ductwork, plumbing, and
electrical connections.
Installation
Model Unit Width Depth Height a b c d
14" Cabinet
in 14 18 3/4 27 1/8 13 14 16 12
mm 355.6 476.3 689 330.2 355.6 406.4 304.8
16" Cabinet
in 16 20 3/4 27 1/8 14 16 18 13
mm 406.4 527.1 689 355.6 406.4 457.2 330.2
18" Cabinet
in 18 25 3/4 29 1/8 16 20 23 14
mm 457.2 654.1 739.8 406.4 508 584.2 355.6
Example only
LEFT SIDE
0 inch
RIGHT SIDE
0 inch
BACK
0 inch
PLENUM
0 inch
BOTTOM
0 inch
FRONT
SERVICING
2) Dimensions

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3) Installation examples:
The iFLOW air handler is multi-positional and therefore can be
mounted in any position. If installed with air conditioning, proper
positioning of the evaporator coil and drain line must be considered to
install correctly.
Vertical Installation
Horizontal Installation
The evaporator coil must be installed on the supply side of the air
handler.
Hanging Installation
Ceiling Installation
4) Water Heater / Boiler Piping:
When installing the iFLOW air handler with a heating boiler or combi-
boiler in a closed loop system, refer to the boiler manufacturer’s
instructions for proper installation with an air handler. Depending on
the boiler selected and system design, it may be required to use a
primary/secondary piping arrangement to de-couple the flow through
the boiler from the flow through the air handler.
Air-removal device:
Provisions shall be made for the removal of air in the heat-distribution
piping system. The air-removal device shall be located in the area
of the heat-distribution piping system where the air is likely to
accumulate (often the highest point in the system).
Required Components:
Expansion tank, isolation valves, air eliminator, dirt collector/filter/
strainer (if other heating loads are being heated by the same boiler),
make-up water and low loss header (optional).
Sensor Installation
A/C Evaporator Temperature Sensor: Air outlet on the Evaporator
coil (See Installation Illustration: Page 12)
Zone Air Temperature Sensor:
Zone supply side: Air outlet of the damper
Zone return side: Air inlet of the damper (if there is a dedicated return
duct with the damper)
5) Domestic Piping:
Notes: When installing the iFLOW air handler with a water heater,
refer to the manufacturer’s guidelines on coupling the water heater
with an air handler. Use components and piping that are allowable
with potable use. Lead-free solder must be used on all joints.
When both top and side connections are present on the water heater,
the side connections should be used for the space-heating loop.
The heating loop connections should be positioned horizontally in a
vertical section of the domestic water line for both the inlet and outlet.
Refer to the piping diagram for details. Minimize the distance and
piping between the water heater and the iFLOW air handler.
If the main water line has an installed check valve, a potable
expansion tank must be installed to provide room for the expansion
of water.
AHU with
Case Coil or A Coil
Evaporator
Temperature
Sensor position
Filter Rack Filter Rack
Support
Anti-Vibration Pad
The Threaded Rod
Spring
Flat washer
Nut
Minimum 6inch
Filter Rack Filter Rack
Minimum 6inch
Evaporator
Temperature
Sensor position
AHU with
Slab Coil
AHU with
Case Coil or A Coil

iFLOW HVAC INC. www.iflowhvac.com 10
7) Electrical requirements and making connections:
This unit requires single phase AC 120V power to operate and must
be hardwired. To connect, follow these directions:
1. To avoid electrical shock, turn off electrical power at the breaker
dedicated to the air handler. Ensure the power remains off while any
wiring connections are being made.
2. Remove the iFLOW front access panel.
3. Route the field supplied line voltage wiring to the iFLOW air
handler.
4. Using CSA & UL listed wire nuts, connect the field supplied wires
to the air handler (black to black and white to white).
5. Connect ground wire to GND terminal.
6. Repeat the process for the circulating pump (connect to terminal
block).
7. Route low voltage thermostat wire to the unit; connect to
thermostat terminal on control board.
8. Re-secure the front access panel.
8) Temperature sensors:
The iFLOW air handlers come equipped with 5 wire sensors that plug
into connectors on the control board for easy servicing.
1. Supply water sensor: mounted on the supply end of the water
heating coil.
2. Return water sensor: mounted on the return end of the water
heating coil.
3. Supply air sensor: mounted above the water heating coil exchanger
to detect supply air temperature and freezing temperatures.
4. Return air sensor: factory installed in return air path blower. If you
install a slab coil on the return air side, you must install the return air
sensor before(or upstream of) the slab coil.
5. Outdoor temperature sensor: modulates air handler operation
based on outdoor temperature. Provides outdoor reset function.
6. A/C Evap sensor: mount on the A coil, or on the slab coil. It should
be installed on the surface of the cold air outlet on the evaporator or
the U-bend pipe. Refer to the figure below.
6) Installing the iFLOW air handler with a tankless/tank water
heater:
Check with the tankless water heater manufacturer prior to installation
to ensure it can be used for combo space heating applications. Make
sure to check that the valves, including but not limited to the purge
and isolation valves are properly installed. If connecting to a tankless
water heater, the circulating pump needs to be sized correctly.
Air
Elliminator
Expansion
Tank
Circulator
with
Check Valve
Flow
Switch
Check
Valve
Tank
Water Heater
D H W
An�Scald
Valve
Cold
Water
An�Scald
Valve
Tankless
Water
Heater
Circulator
Expansion
Tank
Flow
Switch
Check
Valve
D H W
Cold
Water
Air
Elliminator

iFLOW HVAC INC. www.iflowhvac.com 11
CAUTION
Correct Wiring:
Correct Wiring:
A/C compressor interrupt enabled
Location of connector may vary by model
Incorrect Wiring:
No A/C Evap Coil Freeze Protection;
No warranty for damaged PCB or freezing of the hydronic coil
9) A/C Evaporator Coil Freeze Protection and the Importance
of Wiring the A/C Compressor to the Proper and Dedicated
A/C Connector on the iFLOW PCB:
The iFLOW Hydronic Furnace incorporates advanced freeze
protection for your A/C evaporator coil. When the iFLOW A/C
Evaporator temperature sensor sees an air temperature of 37°F
(3°C) or below, the iFLOW will immediately interrupt the power supply
to the A/C compressor for 5 minutes. It will however maintain the
blower ‘ON’ to move air flow across the evaporator coil to warm it and
to prevent freezing. When the iFLOW A/C Evaporator Temperature
sensor sees a temperature of 45°F (7°C) or more than 3 minutes has
expired since initial compressor interrupt, it will allow the compressor
to begin again. There is a minimum off period of 3 minutes to prevent
on/off damage to the compressor.
As such, when installed properly, there should be no concern
about freezing the evaporator coil, damaging the A/C compressor
nor freezing the hydronic coil with an iFLOW Hydronic Furnace.
To ensure full protection however, you MUST follow the 2-Step
installation explanation below:
To ensure the iFLOW will be able to interrupt the A/C compressor
when needed to protect the equipment, the A/C compressor must be
wired to the dedicated A/C terminal on the PCB (see figures C-1 &
C-2). The location on the PCB of this dedicated A/C connector varies
by model; please consult the wiring diagram section of this installation
manual for details.
The 24V output signal for the A/C compressor MUST NOT BE
CONNECTED be connected to the thermostat connection on the PCB
(see figure D). If the 24V signal for the A/C compressor is connected
to the thermostat connection on the iFLOW PCB, the 24V signal will
come from the thermostat and there is no way for the iFLOW to interrupt
the compressor, thus you will have NO A/C FREEZE PROTECTION.
In addition, there is a high likelihood of damage to the PCB and the
hydronic coil. There will be NO WARRANTY for PCB damage nor
freezing damage to the hydronic coil resulting from improper field wiring.
Step 1
Thermostat Connection to iFLOW PCB
From Thermostat
FIGURE C-1:
FIGURE C-2:
FIGURE D:
CAUTION
To A/C Compressor
From Thermostat DO NOT DO!
Dedicated A/C Compressor Output Connector
To A/C
Compressor
To A/C
Compressor
R RW WG GY1 Y1Y2 Y2C C
Single Stage Condensing Unit Two Stage Condensing Unit

iFLOW HVAC INC. www.iflowhvac.com 12
To ensure the iFLOW can protect the A/C evaporator coil from
freezing up, iFLOW has an “A/C EVAP Temperature sensor” (part
number: 30ETS01B) that must be attached to A/C coil in a way that
it is able to sense the accurate air temperature coming directly off
(downstream of) the A/C evaporator coil. Figure E below depicts
the location of the A/C Evaporator Temperature sensor when using
a cased coil or an A-coil in the supply duct and Figure F depicts the
location of the A/C Evaporator Temperature sensor when using a slab
coil in the return duct. In both cases, insert the sensor in between the
fins on the coil.
Step 2
FIGURE E:
FIGURE F:
AHU with
Case Coil or A Coil
on the Supply
Evaporator
Temperature
Sensor position
Air
Flow
Evaporator
Temperature
Sensor position located
downstream of slab coil
AHU with slab
coil on the Return
Air
Flow
Position the sensor in the A-coil in the supply duct as shown above
in Figure E. To relocate the A/C evaporator temperature sensor to
a slab coil in the return duct, follow the following steps. From the
factory, the sensor is placed loose on top of the hydronic coil. Follow
the wire back towards the PCB and disconnect the sensor at the
black male/female connector located between the sensor and the
PCB. Gently push the sensor back through the rubber grommet; the
sensor is now free. Relocate the sensor as shown above in Figure F.
Once the sensor is relocated, reconnect the wire. If necessary, use
any thermostat wire to extend the length of the sensor wire. When
running the wire back to the original connector, ensure the wire runs
around and not in front of the PCB and transformer.
The connection port on the iFLOW PCB for the A/C Evaporator
Temperature sensor varies by model but is generally located near
the top center of the PCB. Please consult the PCB schematic in the
installation manual for details.
If steps 1 & 2 are followed, the iFLOW delivers A/C evaporator and
hydronic coil freeze protection.
IMPORTANT

iFLOW HVAC INC. www.iflowhvac.com 13
3) Sequence of operation:
Cooling: When the thermostat calls for cooling, the circuit between
R and G is completed. The normally open contacts close and the air
handler blower motor operates. The circuit between R and Y is also
completed; this closes the contact on the outdoor condenser unit.
The air handler fan turns off 45 seconds after the call for cooling is
completed.
Heating: When the thermostat calls for heat, the circuit between R
and W is completed, activating the hot water circulating pump. A dry
switching relay labeled “T T” can be used to activate a boiler or combi
boiler. After the circuit between R and W is completed, a time delay
follows before the circuit between R and G is completed, which will
then activate the air handler blower motor.
Freeze protection: If the temperature of the water in the hot water
coil drops below 40°F/4°C, the circuit between R and W is completed.
This will activate the circulating pump until the water temperature
reaches 70°F.
Pump timer/ exercise function: The iFLOW control is equipped to
turn on the circulating pump to cycle the total volume of potable water
in the system if the pump has not been turned on within the past
24 hours. This function is skipped while the A/C condensing unit is
operating.
How to Access and Configure the iFLOW Intelligent
Controller
The controller has 4 modes:
The controller has 4 buttons used to navigate those modes:
MODE: Press the ‘MODE’ button to scroll between the different
modes, numbered 1-6 (see above).
ENT: Press the ‘ENT’ (enter) button to confirm the mode you wish to
enter. Press ‘enter’ to also confirm any changes or commands that
you selected using the ‘up’ and ‘down’ buttons (see below) while in
each mode.
UP & DN: Once you are in a ‘mode’, press the ‘UP’ and ‘DN’ (down)
buttons to scroll all menu lists of the various information.
1) Procedure:
Do not start the boiler or water heater until ALL air has been purged
from the water lines and air handler pump.
1. Fill the boiler loop or water heater with water. Do not start it.
2. Purge all air from the heating boiler or domestic hot water system
(Hold the UP & ENTER button for 10 seconds and then the circulator
will alternate power ON and OFF for about 10 minutes to purge air).
3. Purge all air from the space heating loop by closing the isolation
valve on the return leg of the loop and open the drain to purge the air.
Open the return leg isolation valve and then close the drain valve.
4. If a bleed screw is not present, it is recommended to run the pump
on speed #3 for 1 minute. If air is still present, switch from speed #1
to #3 every 10 seconds for a minute.
5. Start the boiler or water heater according to the manufacturer’s
instructions. Set the design water temperature and wait for the
system to satisfy and shut off.
6. Turn on the power to the iFLOW air handler and set the room
thermostat to ‘heat’ to energize the fan and pump. If noise is still
present after one minute, repeat step #3 to purge air.
7. Check supply and return pipes for temperature differences to
make sure there is flow. There should be a noticeable difference in
temperature. Use caution when supply water temperature is above
120˚ F.
2) Flushing the heat exchanger:
Flushing the hot water coil prior to startup is required to remove any
residual material from the installation or manufacturing processes as
well as to remove any air from the system. Take precautions while
flushing the air handler to prevent the multi-function control board and
other electrical components from getting wet.
The iFLOW air handler requires an external circulating pump to be
installed and should be installed with an external purge valve.
Flushing is a 3-step process:
1) Use a bucket or hose to dispose of water during the flushing
process. First, flush the return line by closing the inlet valve (supply)
and opening the outlet valve (return). Open the purge valve. Close
the purge valve once flushing is complete.
2) Second, flush the supply line and coil by closing the outlet valve
(return) and opening the inlet valve (supply). Open the purge valve.
Close the purge valve once flushing is complete.
3) Third, apply power to the air handler. Open inlet and outlet valves.
Engage the pump and open the purge valve. Verify proper flow
direction - inlet valve sh
START-UP
1. Information 3. Parameters
2. Error Codes 4. Test Mode

iFLOW HVAC INC. www.iflowhvac.com 14
Display Description Explanation
Blower Motor Speed
Indicates present operation as
a percentage of the total fan
motor CFM capacity
Circulator Speed Indicates the percentage of the
total GPM of the circulator
Water Temperature ∆t
(Delta T)
Indicates the difference
between the supply and return
water temperature in °F
Air Temperature ∆t
(Delta T)
Indicates the difference
between the supply and return
air temperature in °F
Outdoor
Temperature
Displays the outdoor air
emperature in °F.
Supply Water
Temperature
Displays the temperature of the
water entering the hydronic coil
heat exchanger, in °F
Return Water
Temperature
Displays the temperature of the
water exiting the hydronic coil
heat exchanger, in °F
Supply Air
Temperature
the temperature of the air
exiting the air handler into the
plenum, in °F
Return Air
Temperature
Displays the temperature of the
air entering the air handler from
the return duct, in °F
Display Description Explanation
A/C Evaporator
emperature
Displays the current
temperature of the air sensor
attached downstream of, but
near the evaporator coil in °F
Dehumidifier
Evaporator
Temperature
Displays the current
temperature of the sensor
located in the dehumidifier
evaporator, in °F
Humidity Value
Measured value of the current
humidity in the return section of
the unit
Flow Switch On/Off
State
Indicates whether the external
flow switch, which is wired to
the control board, is activated
or not
(ON = flow; OFF= no flow)
Circulator Relay State
Indicates whether the external
field supplied
circulator is in operation
(ON = should be operating;
OFF= should not be operating)
Boiler TT State
Indicates whether the air
handler is currently sending a
dry contact call for heat to the
connected boiler
(ON = calling boiler on;
OFF= not calling boiler on)
A/C Relay State
Indicates whether the air
handler is sending an AC 24V
call to the condensing unit
Dehumidifier Relay
State
Indicates whether the
Dehumidifier is in the on or off
condition.
Humidifier Relay State
Indicates whether the external
humidifier which is wired to the
c ontrol board is in on or off
condition
Information Mode
How to access Information display:
Push the mode button until the screen reads 01Inf. Press enter
to confirm the information mode. Use the up and down buttons to
see the different information unavailable from number 01‐19. The
3 characters on the right and side will indicate the value. If the
sensor is not installed, 999 will be displayed.

iFLOW HVAC INC. www.iflowhvac.com 15
Display Description Explanation
EXAMPLE OF LAST 10 ERROR CODES
Parameter Settings Mode
How to Parameters settings:
Push the mode button until the screen reads 03 SEt. Press enter
to confirm the Parameters mode. The screen will show the first
parameter 01. Use the up and down buttons to choose which
parameter to be changed from number 01‐28 and press enter. The
3 characters on the righthand side will indicate the value. Use the
up and down buttons to change the range of the value and press
venter to confirm and mode to exit.
Error Mode
How to access Error codes:
Push the mode button until the screen reads 02 Err. Press enter to
confirm the Error code mode. Use the up and down buttons to see
the last 10 errors which will be numbered 01 to 10, with 01 being
the most recent. The 3 numbers on the righthand side will indicate
which error code is present. If more than 10 errors occur, the oldest
error will be deleted from the memory.
Item Display Range Default
Fan Min. Speed (Heat) 5 - 40 30
Fan Max. Speed (Heat) 40 -100 60
Pump Min. Speed (Heat) 40 - 60 45
Pump Max. Speed (Heat) 60 - 100 70
Blower Motor Speed
@ G Mode 5 - 30 10
Y1 Blower Motor Speed 20 - 65 55
Determines the Y1 cooling mode of the blower motor operation after
a call for cool occurs.
Y2 Blower Motor Speed 65 - 90 80
Determines the Y2 cooling mode of the blower motor operation after
a call for cool occurs.
Lowest Outdoor
Temperature 0˚F - 32˚F 5˚F
Min. HeatLoss 6 - 30 KBTU/h 20K
Max. HeatLoss 15 - 100
KBTU/h 60/70/90
Determines the desired maximum BTUH output that is required.

iFLOW HVAC INC. www.iflowhvac.com 16
Test Mode
How to access Test codes:
Push the mode button until the screen reads 04 tES. Press enter to
confirm the test mode. Use the up and down buttons to choose the
test number 01-9. Each test will be explained below.
Description Display Test Operation
Blower Motor Speed Test 0 - 100%
Press enter while 01 is flashing. Display will flash 0. use arrows to
change value from 0-100% blower speed. Blower will speed up and
down simultaneously as you increase or decrease the value.
Circulator Speed Control 30 - 100%
Press enter while 02 is flashing. Display will flash 0. use arrows to
change value from 0‐100% circulator speed.
Circulator will speed up and down simultaneously as you increase
or decrease the value.
Relay
Output
Circulator
Relay AC 24V
Press enter while 03 is flashing. Display will show OFF. Use up or
down to turn on. Relay test will start immediately. Press enter to
exit.
Description Display Test Operation
Boier TT Relay ON / OFF
Press enter while 04 is flashing. Display will show OFF. Use up or
down to turn on. Boiler TT Relay will start immediately. Press enter
to exit.
OPT
Reserved
Dehumidifier Relay ON / OFF
Press enter while 06 is flashing. Display will show OFF. Use up
or down to turn on. Dehumidifier Relay Test will start immediately.
Press enter to exit.
Humidifier Relay ON / OFF
Press enter while 07 is flashing. Display will show OFF. Use up or
down to turn on. Humidifier Relay Test will start immediately. Press
enter to exit.
Flow Switch ON / OFF
Press enter while 08 is flashing. Jumper terminals Flow Switch
on right hand side of control board. The display will flash ON if
it is working correctly. Also you may turn the hot water tap on if
connected to a tankless water heater for the same.
Y1 Relay ON / OFF
Press enter while 09 is flashing. Display will show OFF. Use up or
down to turn on. Y1 Relay will start immediatley. Press enter to exit.
Y2 Relay ON / OFF
Press enter while 10 is flashing. Display will show OFF. Use up or
down to turn on. Y2 Relay will start immediatley. Press enter to exit.
B Relay ON / OFF
Press enter while 11 is flashing. Display will show OFF. Use up or
down to turn on. B Relay will start immediatley. Press enter to exit.
O Relay ON / OFF
Press enter while 12 is flashing. Display will show OFF. Use up or
down to turn on. O Relay will start immediatley. Press enter to exit.
Item Display Range Default
Hybrid Mode 0=Diable,
1=Enable 0
0 : Hot Water Only (water heater, boiler or combi-boiler)
1: Hot Water + heat pump (Hybrid)
H/P Cut-Off Temp. 32 ~ 46°F
(0 ~ 8°C) 40
Set the lowest temperature at which you wish the heat pump
to operate (Balance Point Consideration: H/P COP and cost of
electricity at that temperature vs. gas efficiency and cost of gas).
Below that temperature, iFLOW will switch to the gas hot water
source.

iFLOW HVAC INC. www.iflowhvac.com 17
1) Maintenance:
At the beginning of each season, the air handler should be serviced
by a qualified installer or service technician.
• Filter: This filter should be inspected and replaced as required.
• Coils: the heating and air conditioning coils should not require
regular maintenance IF a regular filter maintenance schedule is
followed. In the event, the filter is damaged or plugged and dust
has fouled the coil, replace the filter and carefully vacuum the
heating and/or A/C coil.
• Circulator: The circulating pump is water lubricated and should
not require regular maintenance. The system control has a pump
exercise function during prolonged periods of no heat to avoid
seizing.
• Blower: The blower requires regular cleaning due to the build-up
of dust. In the event the filter is damaged, refer page 52 ~ 53 for
disassembly.
2) Checking Temperature Sensors:
1. Remove cables from the temperature sensor.
2. Check the sensor resistance and compare the actual values with
the curve on the chart.
3. Replacement of a sensor is required in the case of severe
deviation.
Water Temp. Sensor Chart
Resistance
Service and Maintenance
Evap. Temperature Sensor
ResistanceResistance
Temperature
Outdoor Temp. Sensor Chart

iFLOW HVAC INC. www.iflowhvac.com 18
3) Field Installation Wiring Diagram
FIELD WIRING
C1 C2
C3
PGM
AHU-A2(200131)
HVAC INC.
iFLOW
R31
LED33
R23
C45
~ ~
BD1
~ ~
- +
BD2
BUZ1
C6
C7
C8
C9
D9
D10
D11
D12
F1
C4C5
C10
C12
C15
C19
C30
C31 C32 C33
C34
C35
C36
C37
C38
C39
C40C41C42C43
D1
D2
D7
D8
C21
C23
C27C28C29
J15
J16
J17
J18
J5
J8
J9
J11
J13
J14
J1
J2
J3
J4
LED26LED27LED28LED29LED30
Q1
Q2
Q3
LED18
LED19 LED20
LED22
LED23LED24LED25
R5
R6
R8
R9
R10
R11
R12
R13
R14
L1
LED1
LED2
LED4
LED5
LED6
LED7LED8
LED12
LED13LED14 LED15
LED16
LED17
R72 R73
R74
R75
R76 R77 R78 R79
R80
R101R102
R103
R104
R105
R106
R109R110R111
Q4
Q5
Q6
Q7
Q8
Q9
R1R2
R3
R4
R90
R91
R92
R93
R94 R95
R97
R98
R99R100
R25
R30 R32 R33
R38
R41
R42 R45
R47
R15 R16
R17
R18
R19
R20
R21
R22
R24
R63
R64 R65 R66
R67
R68
R69
R70
R71
R48
R49
R50
R51
R53
R54
R55
R60
R61
R62
R81
R82
R83
R84 R85 R86
R87
R88
R89
T2
T3
R112R113R114R115R116
RY1
SW1
T1
RY6
RY7 RY2RY3RY4RY5 RY8
RY9
U1
U2
U3
U8 U9
T5
T4
T6
U10 U11
U12
U21
U24 V1
LED21
FUSE/ 3A
EWT SENSOR
LWT SENSOR
R C
BLOWER
MOTOR
Thermostat
Flow Switch
O. D. SensorO. D. Sensor
TRANSFORMER
AC EVA. SENSOR
SAT SENSOR
DEHUMIDITY SENSOR DEHUMIFIER EVA. T. SENSOR
RETURN AIR TEMP. SENSOR
LEGEND / L : LINE/HOT
N : NEUTRAL
G : GROUND C1 : CIRCULATOR SPEED CONTROL
C2 : CIRCULATOR RELAY CONTROL
* Do Not Connect A/C on Thermostat Connector *
CC
1 2
N N L L
GND
CIRCULATOR
AC120V
AC24V
TO T1
UART
AC24V
From Transformer
BoilerTT
Dry Contact
Humidifier
AC24V
Dehumidifier
AC24V A / C or
H / P
Condensing Unit
FUSE/ 3A
R C
T T R Y1 Y2 BOPT O
RLY LN TR
ACE SAT RWT SWT
R W G Y1 Y2 C O.D.S. F. SW
HUM DEH RAT BLOWER CTL
WIRING DIAGRAM

iFLOW HVAC INC. www.iflowhvac.com 19
4) A2 Field Wiring
O.D.S
THERMOSTAT
A2 FIELD WIRING
OUTDOOR
SENSOR
BOILER T T
AC24V
AC24V
CONDENSING UNIT
R
Y1
Y2
O
B
C
DRY C
R
W
G
Y1
Y2
CHUMIDIFIER
DEHUMIDIFIER
H/P: Hybrid Heating
Heat: Y1, Y2, B, C
Cool: Y1, Y2, O, C
A/C: Hot Water Heating
Cool: Y1, Y2, C
F.SW FLOW SWITCH