York 076-090 Technical Information download pdf (Page 37)

Duct electric heaters for SICH-070B to 180B,

240C and 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

POWER SUPPLY AND

CONTROL CABLE INTAKE

237

CONNECTING BOX TO BE

MOUNTED ON JOB SITE, ON

OPPOSITE SIDE

CONNECTING BOX COVER

18,5

100

(1)

(1) ONLY IN MODELS

RTC/RTH-15B to 30B

527

505

427

310

447

350

490

380

412

145

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York 076-090 Technical Information Page 37

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