HEATFLO KUH-C-07-21 (01) PDF Document

The following table outlines the electrical data and standard contactor ratings for various models, including the HEATFLO KUH-C-07-21. Note that the 208V amperage is 86% of the 240V value.

There is an ELECTRIC SHOCK HAZARD. You must disconnect all power before installing the disconnect switch. Failure to do so could result in personal injury or property damage. The disconnect switch must be installed by a qualified person and must be effectively grounded in accordance with the National Electrical Code, NFPA 70.

The installation procedure involves the following steps:

1. The amperage rating of the disconnect must be equal to or greater than the amperage rating marked on the nameplate located on the bottom access door. Verify this against Table A.

2. The power disconnect kit is to be installed in the rectangular knockout located in the bottom right corner on the back of the heater. The knockout can be removed using a hammer and chisel or other appropriate means. For easier access to terminal screws to wire pigtail leads supplied on the heater, it is suggested that these connections be made before installing.

3. The disconnect switch assembly consists of a mounting bracket, disconnect switch, mounting plate cover, and self-tapping screws.

4. The Disconnect switch, with its mounting bracket, should be inserted into the heater cabinet by opening the bottom service door and positioned behind the opening created in Step 2.

5. The disconnect switch, with its mounting plate, should be inserted into the heater cabinet by opening the bottom service door and positioned behind the opening created in step 2.

6. Insert the four self-tapping screws into the four holes in the rear panel. They should engage the holes in the mounting plate and then be tightened until they are secure.

7. Mount the switch faceplate to the switch using the two provided screws. Mount with the “OFF” position to “0” to the left and the on position “1” to the top. Slide the handle over the shaft and tighten the screw to secure.

The wiring procedure for the disconnect switch is as follows:

1. Use the three pigtail leads supplied with the kit (40 & 80 Amp) when connecting to the power line. Use No. 4GA Copper conductor wire only for 100 Amp disconnect when wiring to the power line.

2. The power disconnect wiring to the heater is to be made using the pigtail leads supplied on the heaters up to and including 25 kW. On larger heaters, the installer should supply 105˚C type AWM 600V wire.

3. Use copper supply wire only with this switch.

Note: For units without contactors, the disconnect switch is to be wired to lead wires on heater power. If using one-phase power service, remove lead wires marked L2 and AL2.

For the KDS-1 kit (applicable to 40 and 50 Amp kits), the switch disconnects the power to power leads when the handle is rotated to the “0” position (left). The power is on when the switch handle is rotated to the “1” position (top).

For future replacement parts, the model number should be modified on the nameplate to show that a disconnect kit has been field installed on the heater. A label kit (P/N 170-302788-002) has been included in the plastic envelope located in the disconnect kit. Cut off the appropriate number for the size disconnect being installed (40 Amp = 1; 80 Amp = 2; 100 Amp = 3). The label has a pressure-sensitive adhesive back so that the number can be placed over the “0” at the end of the Catalog Number.

The following table lists the replacement parts for the Disconnect Switch Kits: