IBC AHU 800, Installation & Operating Manual

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Air Handler Coil Head Loss - AHU 1200 LV and AHU 1200
Flow rate (gpm) 3 4 5
Fluid pressure drop (ft) 2.7 4.6 6.3
Table 10 Air handler coil head loss at 180°F (82°C) - AHU 1200 & AHU 1200 LV
Air Handler Coil Head Loss - AHU 1600 and AHU 2000 LV
Flow rate (gpm) 3 4 5
Fluid pressure drop (ft) 2.2 3.4 5.1
Table 11 Air handler coil head loss at 180°F (82°C) - AHU 1600 & AHU 2000 LV
2.4.2 Using Propylene Glycol
Using a propylene glycol / water mixture with the boiler/ air handling appliance reduces the heating
capacity of the system by up to 10%, and increases the pump head required to circulate the heating
fluid. Use a minimum of 25% to a maximum of 50% propylene glycol mixture.
It is important to install the system with the correct pipe size to achieve optimum heating capacity from
the air handling appliance. It is equally important to choose the correct circulator.
2.5 Connecting the appliance to a tankless water heater
Check local codes to ensure that piping the appliance to a tankless water heater is allowed. The air
handler is approved for potable water use.
The air handling appliance must be installed in close proximity to a tankless water heater. As a
guideline, we recommend a maximum distance of 10 feet between the appliance and the tankless
water heater using ¾" copper piping.
The table below provides pipe sizing specifications for IBC's tankless water heater. Refer to other
manufacturers' manuals for correct sizing of pipes.
Note
For pipe sizing, refer to the Installation manual of the water heater manufacturer for head
loss specifications.
Tankless Water Heater Head Loss - Superflow SFT 199
Flow rate (gpm) 3 4 5
Head loss @ flow (ft) 14 23 33
Table 12 Tankless water heater head loss: SFT 199
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2.4.2 Using Propylene Glycol