Location; Ductwork; Heating Coil; Cooling Coil - Dettson DCAH Série Guide D'installation

Figure 1 : Installation on wall

If the unit is installed in a humid location, condensation may
occur and cause damage. For these installations, the unit
should be completely insulated with 1'' thick fibreglass with
the vapour barrier on the outside.
While designed to operate quietly when properly installed,
several steps should be taken to insure this. Use of isolation
pads when mounting unit, flexible duct collars for discharge
and use of acoustical duct liners are all good installation
practices that promote quiet operation.
CAUTION
Unit must not be operated during building construction
due to excessive airborne dust and debris.
The unit must not be operated under any circumstances
without an air filter in place. Dirt will clog the coils and
the efficiency of the unit will be drastically affected.

LOCATION

2.1
CAUTION
The unit must be installed in a level position.
Non-observance of these instructions will potentially
result in unit and/or property damage.
CAUTION
This unit is not watertight and is not designed for
outdoor installation. It must be installed in such a
manner as to protect its electrical components from
water. Outdoor installation will lead to a hazardous
electrical condition and to premature failure of the
equipment.
This unit has a 0'' minimum clearance to combustible
materials rating from all cabinet surfaces. The discharge
plenum and duct also carry 0'' safety clearance.
The unit should be installed with a clearance of 30'' from the
front of the unit for service. Space should be allowed for
filter, pump and electrical compartment access.
2.2
The discharge plenum shall be fixed to the exterior of the
outlet flange. A flexible duct collar is recommended for a
better noise control.
The return duct can be fixed on the right hand or the left
hand side of the unit. Cut-off the pre-perced face and the
insulation of the desired side. Bend flanged out 90 degres. In
order to maximize the airflow of the return duct, it is
recommended to completely cover with aluminium tape the
pre-perced holes of the unused side and all other places
where air can infiltrate the unit.
2.3
The heating coil is already installed in the unit. The
DNS-1355 Rev. A
recirculating pump with its one way valve is integrated to the
unit as well. Braze water inlet and outlet as shown on figure
1. Install shut-off valves on hot water supply and water return
for servicing the unit.. Install a drainage valve on the water
return as shown on figure 2. Verify that all welds are leak
free.
When the unit is not used for more than 6 hours, the
electronic card activates the pump for 60 seconds. This
insure a regular water flow inside the heating coil.
When brazing, it is recommended to have a fire
extinguisher nearby.
In order to prevent any damage, use a heat screen or
wet rag when brazing nearby the cabinet or other heat
sensitive components.
Do not bend or force the water inlet/outlet of the heating
coil. This may cause leakage when water pressure is
applied.
2.4
The cooling coil may be installed on the right hand or left
hand side of the cabinet. The cooling coil is factory set for
right hand side installation.
To set the cooling coil on the left hand side:
1-
2-
The cooling coil must be seated on the Styrofoam block to
prevent condensation.
The connections to the outdoor unit are to the front of the
unit.
4

DUCTWORK

HEATING COIL

CAUTION

COOLING COIL

Unscrew 4 screws of the drain pan and 4 screws of
the top channel. Screw back the top channel in
place of the drain pan and the drain pan in place of
the top channel. Rotate the coil to be seated on the
drain pan again and slide it inside the cabinet, on
the left side;
Unscrew the blower lock screw, on the blower rail,
slide out the blower, reverse it, slide it back and
rescrew the lock screw.