C Unit Installation

When you have completed the installation of the Phenomenal Aire C6 or C10 Unit, it will look like the sample picture, unless the space available requires a different placement of parts.

Be sure to leave enough cord to the C Unit so that removal is easy.

Also, make sure that the location of the C Unit provides enough space for stingers to extend into the ductwork

C Units

The Phenomenal Aire C6 and C10 Units are shown in the picture.

Again, be sure to leave enough cord to the C Unit so that installation and removal are easy.

Do not pick up the C Units by the Stingers. Be sure to pick up the C Units by the head cap.

Lockout

Follow your company’s Lockout/Tagout safety procedure to ensure that the air handling unit and any electrical connections are  properly deenergized prior to the beginning any installation.

3-5/8” Hole Template – Placement

Locate the best position for mounting the C Unit.

Tape the hole template ( found in the C Unit box.

3-5/8” Template Pilot Hole

Drill a pilot hole for the 3-5/8” hole saw.

Drill 3-5/8” Position Hole Saw Center Drill

Position the Hole Saw Center Drill to begin drilling the 3-5/8” hole.

Complete Drilling 3-5/8” Hole

Do not rush or try to push the hole saw because it will bend the sheet metal. Rather, take your time to keep the saw level as it removes pieces of sheet metal. The saw will eventually cut through the metal and the circular sheet metal will usually be found at the end of the hole saw. Be careful, the circular dish can be hot due to the friction produced in cutting the sheet metal.

3-5/8” Finished Hole

Remove any burrs or sharp edges around the hold.

Please note, the 3-5/8” hole can also be created using tin snips or a knockout punch.

Begin to Insert C Unit into 3-5/8” Hole

Carefully insert the C Unit into the 3-5/8” hole until it is flush with the panel.

Fully Insert C Unit into 3-5/8” Hole & Position for Air Flow Direction

Carefully insert the C Unit into the 3-5/8” hole until it is flush with the panel.

Be sure that the air flow arrows align with the normal flow of air in the Air Handling Unit.

The Airflow Direction is printed on the label on the housing.

Air Flow Alignment

Precisely align the Phenomenal Aire unit so the indicated arrows are in line with the air handling system’s air flow.

If you were inside the duct, you would see the stingers aligned as shown in the picture.

Secure the C Unit

Secure the C Unit to the panel with one #10 1” self-tappingsheet metal screw on the right side of the C Unit.

Make sure the unit is aligned in the proper air flow direction.

Installed C Unit Shown Ready for Wiring

This completes the C Unit mounting steps.

Transformer Installation

Remember when you have completed the installation of the Phenomenal Aire C Unit, it will look like the sample picture, unless the space available requires a different configuration.

Be sure to leave enough cord to the C Unit so that removal is easy.

Position Transformer

Locate the transformer on the panel close to the C Unit.

We are using theHoneywell AT140A1018 -Foot Mounted 120/208/240 VacTransformer w/ 9 in. Lead Wires (40VA) to 24 Vac in this installation example

Please consult the manufacturer of your transformer for wiring instructions

Mark Transformer Mounting Holes

Mark the transformer mounting holes.

Secure Transformer

Secure the transformer on the panel using self-tapping hex/slotted screw.

Cap Transformer Wires Not Used

Cap the transformer wires not being used in the installation.

Typically, the red and orange wires are used for 208/240 Vac.

The black and white wires, used for 120 Vac, will be used in this sample installation.

Wire Tie Transformer Wires Not Used

Wire tie the capped transformer wires not being used in the installation.

Connect Transformer to 120 Vac

Connect the white (neutral) and black (120 Vac) wires to voltage available in air handling unit.

Strip C Unit Wires and Secure Fork Spade Lugs with Ground Wire

Strip the C Unit white (neutral) and black (120 Vac) wires.

You will need a length of green wire that will go to Earth ground.
Crimp a fork spade lug on the end of the black wire.

Crimp a fork spade lug on the end of the white wire along with a green wire that will go to Earth ground.

Secure Fork Spade Lugs to Transformer

Connect the white/green and black wires to transformer and tighten the transformer screws.

C Unit Wiring Complete – If Relay Not Required

Carefully roll up the C Unit wire when finished, but be sure leave enough wire for the unit to be removed.

At this point you will be finished if you were able to tie the 120 Vac back to a source that is switched on and off with by the air handling unit.

If the transformer is tied to an unswitched 120 Vac source, you will need to use a relay to isolate the circuits, This is covered in the following Steps.

DPDT Relay Operation

Position the relay. The relay shown is a 90-340. It is commonly used in the air handling industry. It is a double pole (DP) double throw (DT) semi-enclosed relay.

The 24 volt coil is energized through the bottom two terminals. Terminals #1 and #3 close the circuit at the top, and terminals #4 and #6 close at the bottom. These terminals would be called “NO” (Normally Open) because they are both normally open until the relay coil is activated.

Terminals #2 and #5 are available for connection to Earth Ground, you will be selectingone of these during the installation.

If you are interested in more detail you can look at the HVAC School https://www.hvacrschool.com/understanding-relays-90-340/

Position Relay

Position the relay so the wiring is easy to follow, thereby reducing possible errors.

Mark Relay Mounting Holes

Mark the mounting holes as shown.

Secure Relay with Self-tapping Screws

Secure the relay to the panel with sheet metal self-tapping screws.

Prepare Two Wires for Connecting the Transformer to the Relay

Cut a length of white and black wire each long enough to connect the transformer and the relay.

Crimp a fork spade lug on the end of the white wire and one on the end of the black wire.

Crimp a female spade lug on the other end of the white wire and one on the other end of the black wire.

Connect the Two Wires between the Transformer and the Relay

Cut a length of white and black wire each long enough to connect the transformer and the relay.

Crimp a fork spade lug on the end of the white wire and one on the end of the black wire.

Crimp a female spade lug on the other end of the white wire and one on the other end of the black wire.

Connect the Relay to Earth Ground

Crimp a female spade lug onto a green wire that goes to the Earth Ground.

Connect the Relay to the Thermostat

The green wire shown in the picture connects to the thermostat panel.

Connect the Relay to the Thermostat

Crimp a female spade lug onto a white wire that goes to the thermostat panel.

Please note: there isn’t an official standard for thermostat circuit wiring colors, but there is a general pattern.

It is best to look at the manufacturer’s documentation (both thermostat and HVAC).

You may need to find the 24 Vac connections from the manufacturer’s manual.

Connect the Relay to Earth Ground

Crimp a female spade lug onto a green wire that goes to the Earth Ground.

Connect the C Unit to the Relay

Crimp a female spade lug onto the C Unit white wire and one onto the C Unit black wire.

Attach the female spade lugs to the relay terminals that correspond to the transformer wires (white to white and black to black).

As shown, the white wire on terminal #1 will connect with the white wire on terminal #3, and the black wire at terminal #4 will connect to the black wire on terminal #6.

Coil and Wire Tie the C Unit Wire

When you are finished, please be sure to coil the C Unit wire and wire tie it so it does not get in the way of others who will need to access the air handling unit.

Check that the C Unit is Working

After installation has been completed, remove the Lock-out/Tag-out from the power box and turn on the air handling system.

The green LED, located below the fuse, should come on to indicate that the C Unit is energized.

Installation Complete – Check List Item

If the C Unit needs to be connected to the building management system (BMS) continue to the next slide.

Access the Connection Block for the Building Management System

Remove the C Unit from the air handling panel.

Remove the locking bolt to inspect and wire the connection to the building management system.

Access the Connection Block for the Building Management System

To connect to the Building Management System (BAS), remove the plug-in terminal block and connect the wiring as instructed by BAS.

Optional connections of Building Automation System (BAS) dry contact connector

Remove connector & install wiring for dry contact to building management system through pre-drilled hole using the supplied wire grommet.