Chromalox CXH-D-30 Handbuch für Installation und Betrieb - Seite 8
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7. Installation must include appropriate over current protec-
tion devices (fusing or circuit breakers) as required by ap-
plicable electric codes in the supply line to the unit. Refer
to nameplate for proper current ratings.
8. To operate heaters from an externally mounted hazard-
ous location thermostat, a terminal block is provided for
connection (Figures 9 and 10). Remove the factory in-
stalled jumper across T2 and T3 on the terminal strip.
Wire the thermostat contact leads to these terminals. The
built in control transformer supplies the unit with either
24V, 120V, or 230V (690V primary only) for internal unit
operation. This voltage will appear across the thermostat
contacts when they are open. The minimum thermostat
contact rating should be 1 amp @ 120 VAC. Refer to
nameplate for control voltage of unit. The 1/2 NPT con-
duit wiring entry on top of the terminal enclosure should
be used to wire the thermostat to the heater (Figure 10).
9. Protection against overheating is provided by a high
temperature cutout located within the heat exchanger
wiring compartment. (Figure 9) Activation of the control
will open the control circuit and energize the pilot lamp (if
Refer to Nameplate
for Input Voltage
1PH
L1
GND
L1
Contactor
Motor
1PH
Elements
Diagram I - 1 PH Wiring
L2
Optional
Disconnet
Switch
Optional Aux. Cont.
R
L2
L3
Auto Reset
High Limit
Manual Reset
High Limit
supplied). If normal airflow is restricted, or stopped, the
unit will be cycled off by the high temperature cutout. The
high temperature cutout is also designed to shut down
the unit completely if the fluid level is low or other heater
malfunction occurs.
High Temperature cutout(s) must never be bypassed
in the control circuit. If the limit actuates, shut down
unit and investigate cause of abnormal operation. Do
not reenergize until the problem has been corrected.
Users should install adequate back-up controls and
safety devices with their electric heating equipment.
If the back-up controls are to be located in the haz-
ardous area, they must be approved for use in the
class of location. Where the consequences of failure
may be severe, back-up controls are essential.
Transformer Color Code Tabulation
PRI
VOLT.
208
240
380
415
415
480
575/600
H1
Primary
H2
Control Transformer
Refer to Nameplate for Primary (Input)
and Secondary (Control) Voltage.
Secondary
X2
X1
Optional Alarm
Terminal
Block
T3
T2
T1
Optional
8
PRI. XFMR
120V SEC
LEAD CLRS.
LEAD CLRS.
H1
H2
X1
X2
BLK
RED
BLK
WHT
BLK
ORG
BLK
WHT
BLK
VIO
BLK
WHT
BLK
YEL
BLK
WHT
BLK
BRN
–
–
BLK
BLK/RED
BLK
WHT
BLK
GRY
BLK
WHT
Built-In or
External
Thermostat
Connect Thermostat Wires
to the Common and Normally
Closed Terminals of One Pole
on the Thermostat.
Remove this Wire when
Using Thermostat
24V SEC
LEAD CLRS.
X1
X2
YEL
BLU
YEL
BLU
YEL
BLU
–
–
YEL
BLU
YEL
BLU
YEL
BLU