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INSTALLATION
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 (Figure 1).
A. The HDS-1 is rated 50 Amps at 480V or less and 40 Amps
at 500-600V. Verify that the volts and amps of the heater
(see heater nameplate) do not exceed the rating of the HDS-
1.
B. The power disconnect switch kit is to be installed in the five
(5) hole K.O. cluster located in the bottom left front corner
of the heater. The K.O.'s can be removed using a chisel or
similar tool, if the 7/32 Ø K.O.'s are stubborn, it may be
necessary to drill out using a 7/32 drill bit (See Figure 1).
5 HOLE K.O.
CLUSTER
ACCESS
DOOR
Figure 1
INSTALLATION
Any installation involving electric heaters must be
performed by a qualified person and must be effec-
tively grounded in accordance with the National
Electrical Code to eliminate shock hazard.
1. For easier wiring, it is recommended that the pigtail leads
from the disconnect switch be wired to the matching terminals
of the contactor or terminal block. It is also suggested that the
service entrance wiring be done at this time, terminal 1 and 3
for 1Ø and terminals 1, 3 and 5 for 3Ø (see Figure 3).
2. Insert switch through front of heater and secure in place with
the No. 8 screws.
3. Attach faceplate using the No. 6 screws. The "1" on the face
plate to face towards the louvers.
4. Slide handle on shaft of switch and fasten in place by tighten-
ing the pre-attached set screw.
5. Close cover and reattach screws.
HANDLE
NO. 6
SCREWS (2)
FACEPLATE
NO. 8
SCREWS (4)
DISCONNECT
SWITCH WITH
PIGTAILS
GROOVE OF SHAFT
WITH SWITCH IN CLOSED
POSITION
Figure 2
1
3
5
2
4
6
3 Ø WIRING
CONTACTOR
HDS-1
PIGTAILS
L1
L2
L3
1
3
2
4
L1
L2
TERMINAL
BLOCK
PIGTAILS
HDS-1
1 Ø WIRING
Figure 3 - Wiring Diagrams
TA - U0 - EF
Litho in U.S.A.
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493 www.chromalox.com
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.