Chromalox KDS-3, KDS-1 specifications INSTALLATION Cont’d, Wiring, KDS-2 and KDS

INSTALLATION (Cont’d)

KDS–2 and KDS – 3

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 (see Figure 7).

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 (see Figure 8).

10.Place plastic bezel over the installed switch and push towards the switch until the tabs snap into place (see Figure 9).

Rear Case

Switch Assembly Mounted to Rear Case

(4) 8-32 Screws	Cover Plate
Rear Case
	Mount Switch Assembly
	Onto Rear Case of Heater

Figure 7

Figure 8

Snap Plastic Housing

Into Place

Rear Case

Figure 9

WIRING

POWER DISCONNECT SWITCH (Available as a kit or factory installed option.) (KDS-1)This switch disconnects the power to power leads when the handle is rotated to the “0” posi- tion (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.

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 dis- connect 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.

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

For future replacement parts, the model number should be modi- fied on the nameplate to show that a disconnect kit has been field installed on the heater. A label kit (see Figure 14) (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 dis- connect being installed (40 Amp = 1; 80 Amp = 2; 100 Amp = 3). The label has a pressure sensitive adhesive back so that the num- ber can be placed over the “0” as shown in Figure 14.

To

Power

Supply

See Note 2

Power		Pigtail
Disconnect		Leads
Switch		Contactor
L1	AL1
L2	AL2	See Notes
L3	AL3

Notes:

1.This illustration shows wiring hook up for three phase service. 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.

Figure 10

KUH-02 through KUH-25

Power Disconnect Switch

	Power
	Disconnect
	Switch	Contactor (1)
To	L1	AL1
	L2	AL2
Power
Supply	L3	AL3

Contactor (2)

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

Figure 11

3