4
IMPORTANT: Whenever the electric heater power supply is
downstream of the unit main disconnect switch (Figs. 9, 10
and 11) it is not permitted to install a heater of higher capacity
(kW) than indicated in tables 1 and 2, that are the standard
heaters.
C - If the unit has been installed and an electric heater is to be
connected whose control power supply is not connected via
the main unit disconnect switch or if it is desirable to have an
independent power supply connect and protect it as follows:
-
Cables of adequate wire section
-
Fuses F1 with a current that complies with the heater
capacity (kW) installed.
-
A bipole or tripole disconnect switch, depending on
the voltage with the necessary current (A).
-
Locate a thermal-magnetic disconnect switch with
current (A) in accordance with tables 3 and 4 in the
electric heater control box, as described in chapter 5..
Standard heater connection
Fig. 9
4 - ELECTRIC HEATER CAPACITIES (kW)
The electric heater capacities for cooling models or additional
heater capacities for heat pumps, according to valid Carrier
publications, are:
Table 1 – Cooling only models
Unit
Capacity, kW
50TA/TZ 024
4.0 or 4.6
38TA/FZ-40TY/BZ 024
50TA/TZ 036-048
6.0 or 9.0
38TA/FZ-40TY/BZ 036-048
50TA/TZ 060
9.0 or 13.5
38TA/FZ-40TY/BZ 060
50TA/TZ 072 and 084
12.0 or 18.0
38TA/FZ-40TY/BZ 072
38TA/FZ-40TY/TZ 084
Table 2 – Heat pumps
Unit
Capacity, kW
50TY/YZ 024
1.5 or 2.0
38TY/BZ-40TY/BZ 024
50TY/YZ 036-048
3.0
38TY/BZ-40TY/BZ 036-048
50TY/YZ 060
4.5
38TY/BZ-40TY/BZ 060
50TY/YZ 072 and 084
6.0
38TY/BZ-40TY/BZ 072 and 084
Supplied with the voltages indicated in the price list, technical
data, wiring diagrams and applicable manuals.
5 – ELECTRICAL CONNECTIONS
Before the definitive installation of the electric heaters in the
unit a number of operations must be carried out.
5.1 – Power supply
The electric heater power supply is suitable for connection to
the unit control and power wiring box and to the general
disconnect switch of the unit.
The disconnect switch in the cooling only and heat pump units
is designed to support the current (A) of the components
connected to it.
Therefore the power supply of the electric heaters must be
connected downstream of the disconnect switch, as shown in
the unit wiring diagrams (see Figs. 9, 10 and 11).
Possible connections:
A - If the electric heater has not been installed and must be
incorporated, fuses F1 and the power cable section (L1,
L, L3, N) are sufficient for the maximum power
consumption in cooling and heating modes.
B - If the unit has been installed and supplied with the electric
heater incorporated please check if fuses F1 and the power
cable section (L1, L, L3, N) are sufficient for the new
power consumption. Remember that the unit will operate
in heating mode when the electric heater is installed.
Cooling only models = indoor fan plus electric heater
power consumption
Heat pump models = compressor plus indoor and outdoor
fan plus electric heater power consumption.
Fig. 10
Fig. 11
Legend:
Q1
- Unit main disconnect switch (incorporated)
F1
- Fuses to be field-supplied by the installer
-----
Wiring in the unit
-----
Field wiring
NOTE: The unit main disconnect switch has been designed to
support the current (A) of the electric heaters that are
installed. It is not necessary to change it.
Electric heating
To the unit
Electric heating
To the unit
Electric heating
To the unit
