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36
16
POWER AND CONTROL
CABLE INTAKE
237
CONNECTING BOX TO BE
MOUNTED ON WORK SITE,
ON OPPOSITE SIDE
CONNECTING BOX COVER
18.5
100
7
I
50
11
50
11
8
66
15
17
D.6
70
(1)
(1) ONLY IN MODELS
RTC/RTH-15 to 30
527
505
427
310
447
350
490
380
412
145
Duct electric heaters for SICH-070B to
180B and 240C, SIH-300B
These duct electric heaters are designed to provide backup
heat in heat pump units, and complementary heat in cool
only units. On and off cycles are governed by the air condi-
tioning equipment control system. These should be fitted di-
rectly to the impulse outlet of the indoor section of the unit.
Technical specifications
These duct electric heaters include the following components:
- Galvanised sheet casing, covers and supports.
- Exposed nickel-chrome wire electric resistance mounted
on steatite supports.
- Power supply contactor with a 400 V coil.
- Two thermal switches located at the top of the heater. The
first, with automatic reset, disconnects the heater when a
temperature of 77°C is reached. The second, accessible
externally and with manual reset, disconnects the heater
when a temperature of 138°C is reached. With 2-stage heat-
ers, there are four thermal protectors, 2 for each stage.
- Interlock with the indoor fan thermal relay. The control sys-
tem of the unit does not allow operation of the heater when
the indoor fan thermal relay fails.
- Plug-in connector for interconnection between the control
panel of the air conditioning unit and the heater.
- PVC gasket for heater-air conditioner joint and self-thread-
ing screws for fastening the accessory.
General dimensions mm