Trane SCXG-SVX01B-EN manual Hydronic Coil Installation, pre-startup, Installation requirements

pre-startup

Installation requirements

Hydronic Coil Installation

These instructions are for steam and hot water coil installation. The hydronic coil assembly has a full coil, piping, a modu- lating temperature control valve, and a disc temperature limit device located in the unit near the fan on the motor frame. Hydronic coils are available with either right or left-hand pipe connections. Piping connections are identical to the unit piping. For example, if you have right- hand unit piping, the hydronic coil will have right-hand connections. The hydronic coil assembly has temperature controls to keep the unit’s internal cabinet temperature below 105 F to prevent motor and bearing damage.

Installation Procedure

￿WARNING

Unit Structural Integrity!

Unit panels provide structural integrity. Do not remove more than two non- adjacent panels at one time as this could cause the plenum frame to collapse. Failure to follow these recommendations could result in death, serious injury or equipment damage.

1.Remove filter rack from the back of the

unit. Remove the 1/4-inch hex head screws from the top and bottom of the filter rack assembly.The filter rack assembly will hang on the unit when the screws are removed. The filter rack can now be removed by lifting up on the filter rack.

2.Remove the hydronic coil from the crate and position it behind the unit with the open side facing the unit evaporator coil inlet. Also, remove the plastic envelope that is taped to the coil box assembly.This envelope contains the

mounting screws needed to attach the coil box to the unit and the gasket required on the vertical side flanges of the box.

3.Install the pressure sensitive gasket to the unit side of the vertical flange on the coil box in two places.

4.Using 2” x 1/2” standard thread eyebolts, thread into the coil lift plates to raise the coil up to the height necessary to attach it to the unit.The top panel has a “J” hook on it to allow hanging, similar to the filter rack. Align the holes so that the coil hangs on the unit. If the unit has the dirty filter option, connect the static pressure tube to the unit before bolting the coil in place. Locate the static pressure tubing on the unit evaporator coil and route through the knockout in the top corner of the coil box.

5.Align the hydronic coil with the holes in the unit channel or waterside economizer option. Move the coil box up against the unit and install using six mounting screws in the top and six in the bottom of the coil box.

6.Remove the valve and pipe cover on the coil box. Connect the wires that are coiled in the coil box, referring to the wiring diagram installed on the unit control panel door. Route wires into the unit through knockouts in the top of the box.

7.Reinstall the filter rack on the back of the heating coil rack. If the unit has the waterside economizer option, the filter rack will require additional support legs.

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