Electrical System; Installation Of The Thermostat; Figure 2 : Water Piping Installation - Heating Coil; Figure 3 : Thermostat Wiring, Heating And Cooling - Dettson DCAH Série Guide D'installation

The main and secondary drain pipe connections are to the
front of the unit. Before putting the unit in service, verify the
drain pan to be free of any debris. Verify the drains are not
clogged.
2.5

ELECTRICAL SYSTEM

The appliance must be installed in accordance with the
current ANSI/NFPA 70 National Electrical Code, CSA C22.1
Canadian Electrical Code Part 1 and/or local codes.
CAUTION
The exterior of the unit must have an uninterrupted
ground to minimize the risk of bodily harm, if ever an
electrical problem develops. A green ground screw is
supplied with the control box for that purpose.
Only copper wire may be used for the 115V circuit on this
unit. If wires need to be changed, the replacements must
have the same temperature resistance as the originals.
Refer to the nameplate for information on voltage and
amperage of this unit.
2.6

INSTALLATION OF THE THERMOSTAT

A thermostat must be installed to control the temperature of
the area to be heated. Follow the instructions supplied with
the thermostat. Also refer to the wiring diagrams provided
with the air conditioning unit. The connections must be made
as indicated on the following diagrams (Figures 3, 4 and 5)
and the wiring diagrams (Figures 10 and 11)
Figure 2 : Water piping installation – heating coil
5
Figure 3 : Thermostat wiring, heating and cooling – 3

speeds PSC motor

Variable speed models (ECM) Thermostat Field
Connections
Dh Dh is used if additional latent capacity control is
required (see Dehumidification Capability in the
Accessories section for more detail). NOTE: the J1
jumper should already be removed from the factory.
R R signal is 24V hot to thermostat.
W1 W1 signal controls heat from the thermostat.
W2 W2 signal from a two-stage thermostat. This unit is
not intended for two-stage heating. If a two-stage
heating thermostat is used, connect the W2 but do
not remove J2 jumper.
Y1 Connection for the low speed compressor operation.
DCAH
DNS-1076 Rev. C