Installation Instructions; General Information; Technical Specifications - JOHN YORK RTC07L Instrucciones De Instalación

Installation instructions

General information

These duct electric heaters are designed
to provide backup heat in the RTH units,
and complementary heat in the RTC units.
On and off cycles are governed by the air
conditioning equipment control system. They
should be fitted directly in the impulse outlet
of the indoor section of the unit.

Technical specifications

These duct electric heaters include the fol-
lowing components:
- Galvanised sheet casing, covers and sup-
ports.
- Exposed nickel-chrome wire electric re-
sistance mounted on steatite supports.
- Power supply contactor with a 24 VAC.
- Two thermal switches located at the top
of the heater. The first, with automatic
reset, disconnects the heater when a tem-
perature of 77°C is reached. The second,
accessible externally and with manual
reset, disconnects the heater when a tem-
perature of 138°C is reached.
- Interlock with the indoor fan thermal relay.
The control system 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 con-
ditioning unit and the heater.
- PVC gasket for heater-air conditioner joint
and self-threading screws for fastening the
accessory.
6
Installation
Install the electric heater in the RTC/RTH
unit as follows:
1) In all cases, the established national
regulations should be followed.
2) Disconnect the power supply to the air
conditioning unit.
3) Install the automatic and differential
switches for the heater in accordance
with the table of General Characteristics
and the Wiring Diagrams.
4) Remove the access panels of the RTC/
RTH unit control box.
5) Unpack the accessory, opening the top of
the box. Make sure the heater assembly
has not been damaged during transpor-
tation. Check the ceramic insulation and
that the heater wires are not in contact
with any metal parts.
6) Fit the electric heater in the mouth of the
indoor fan panel housing and drill eight
3 diameter holes for fastening. Check
to make sure that the reset push button
of the F9 thermal switch is accessible
and at the top. See Heater Location
diagram.
7) Install the PVC gasket supplied with the
accessory, on the frame surface of the
heater adjacent to the indoor fan panel.
8) Fasten the heater to the panel with the
screws supplied.
9) Remove the electrical connections cover
of the heater and connect the power sup-
ply and operating cables R, B (24 VAC) to
connecting strip X1. Connect the control
cables supplied between connector J1 of
GB
the A3 Auxiliary Resistance board and
connector J10 of the A1 control board of
the air conditioning unit.
10) The installer should complete the
electric circuit of the heater by fitting
an air flow control F14 at the most
convenient point of the ducts so as to
make sure the heater operates only
when there is sufficient air flow.
11) Connect power supply to the RTC/RTH
unit and the heater.
12) To configure the accessory, press the
test button of control board A1 for over
2 seconds, until the red led on the
board goes on. Configuration will be
complete when said led goes off.
13) Check operation of the heater by
selecting the Emergency Heat mode
at the ambient thermostat of the air
conditioning unit.
14) Assemble the electrical box covers of
the heater and the RTC/RTH.
Note:
Should an incorrect response of the system
take place, see the Operation section of the
RTC/RTH Installation Instructions. There
you will find the control functions of the A1
electronic board on the heater, as well as its
configuration, incidents identification, etc.
WARNING
Loose cables can cause overheat-
ing of the terminals or incorrect
operation of the unit. Fire hazards
may also arise. Therefore, make
sure all cables are connected tightly.