HEATFLO KUH-C-30-83 (01) PDF Document

According to Table A in the specifications, the electrical data for the HEATFLO KUH-C-30-83 is as follows:

The following safety warnings apply to the installation of power disconnect switches:

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

The following procedure outlines the preparation steps for installing Power Disconnect Switches:

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

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. See Wiring Instructions.

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

For KDS-1 kits (40 and 50 Amp), follow these installation steps:

4. The Disconnect switch, with its mount-ing bracket should be inserted into the heater cabinet by opening the bottom service door and positioned behind the opening created in the preparation step.

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.

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.

For KDS-2 (80 Amp) and KDS-3 (100 Amp) kits, which feature a mounting bracket for the switch, follow these instructions:

8. The cover plate should be placed over the rectangular opening with its four mounting holes lined up with the four holes in the cabinet and the four holes in the mounting bracket.

9. Insert the four self tapping screws into the four holes until they engage the holes in the mounting bracket and tighten until they are secure.

10. Place plastic bezel over the installed switch and push towards the switch until the tabs snap into place.

Use the following instructions when wiring the disconnect switch:

1. Use the three pigtail leads supplied with kit (40 & 80 Amp) when connecting to the power line.

a. 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.

Wiring Notes:

1. Remove lead wires marked L2 and AL2 when using one phase power service.

2. For units without contactors, disconnect switch is to be wired to lead wires on heater power.

3. Use copper supply wire only with this switch.

4. KUH-30 through KUH-45 units with 2 contactors where the total load does not exceed 48 Amps.

5. KUH-30 through KUH-45 units with 2 contactors where the total load exceeds 48 Amp and sub-circuit fuse blocks are provided.

The operation depends on the specific kit installed:

KDS-1 (Available as a kit or factory installed option): This 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) position.

KDS-2 and KDS-3: This switch disconnects power to the power leads when the handle is placed in its full lower position. The power is on when the switch handle is in its full upper position.

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 on the nameplate.