iFlow iFLH-14000W, Manual

iFLOW HVAC INC.

www.iflowhvac.com

14

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 should become warm before the outlet. Close 

the purge valve once flushing is complete. Operate the pump for 5 

minutes immediately after flushing the system to purge remaining air 

from the pump bearing chamber.

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 6 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.

Information Mode

How to access Information display:

Push the ‘MODE’ button until the screen reads 

Press ‘ENT’ (enter) to confirm you wish to enter the information 

mode. Use the ‘UP’ and ‘DN’ (down) buttons to scroll through the 

menu of information available. The information available varies 

depending on the model of air handler. The 4 characters on the right 

indicate the value.

START-UP

1. Information
2. Error Codes
3. General Parameters

4. Heating Parameters
5. Cooling Parameters
6. Test Mode