Modine Manufacturing SCW Installation And Service Manual - Important
INSTALLATION/START-UP PROCEDURE
7
8-504.6
The fascia can now be unpacked for fitting to the unit
chassis. Ensure the black fir tree fasteners holding the
fascia polystyrene are pushed in firmly in case of transit
vibration. If a fascia aperture needs blanking off, then take
one of the polystyrene blanking pieces and push it into the
recess in the polystyrene fascia insulation. See Figure 7.1.
Install the fascia by removing the inlet grilles and filters,
locating the four fascia mounting bolts on the chassis
through the four keyhole brackets on the fascia and then
sliding the fascia sideways until it locks into position.
Note: Up to two non-adjacent sides can be blanked off.
Figure 7.1
Fascia Blanking Piece
Fascia Blanking Piece
Side view of fascia
Note: Make sure the foam insulating strip profile on the
fascia matches the square and angled corners of the
unit housing.
Before tightening the fascia to the unit, connect the two
halves of the vane motor’s plug and socket connection
(medium and large size units).
On microprocessor controlled units, ensure that the display
panel cable is routed to the electrical panel and securely
fastened to its connector on the microprocessor circuit
board. (Refer to the unit’s electrical wiring schematic). Take
care to ensure that the connector is connected in the proper
orientation and that the wires are not routed such that they
may become trapped, cut, broken or chafed.
The fascia can now be tightened up to the unit chassis until
a good seal is obtained between fascia and chassis.
Note: Do not over tighten the bolts. To do so may cause
damage to the fascia.
With filters in place, the inlet grilles can now be fitted to the
fascia to complete the installation.
START-UP PROCEDURE
IMPORTANT
Start-up and adjustment procedures should be
performed by a qualified service agency.
See start-up sheet example - Figure 9.1
Pre-Start Checks
Once installation is complete it is important that the following
pre-start checks are made:
1. All piping is complete and insulated where necessary.
2. All fans are able to rotate freely.
3. The unit and interconnecting piping have been
evacuated correctly and the condensing unit service
valves are open (SSD and SSH units only).
4. All electrical connections (both power and control) are
properly terminated.
5. All condensate drains are installed correctly.
6. The power supply is of the correct voltage and
frequency.
7. The units are properly grounded in accordance with
current electrical codes.
8. For microprocessor controlled units, check that the
display panel cable is properly connected to the
microprocessor main circuit board and that the jumper
links are correctly set (refer to unit wiring schematic). If
the links are set incorrectly, remove main power supply
before making any changes.
9. For microprocessor controlled units, check that the
battery on the main circuit board is in place and properly
connected. Check also that the batteries are installed in
infrared/pendant transmitter. When a pendant
transmitter is used, ensure it is properly located on to the
wall mounting bracket.
SSD and SSH Units – Control Circuit Checks
Note:
See the installation and maintenance manual
provided with the condensing unit for start-up information.
1. Ensure that the condensing unit start-up procedure has
been carried out, as detailed in the condensing unit
installation and maintenance manual.
2. The compressor should be isolated by removing the
connection at the Y1 terminal on the indoor unit. Main
power can now be applied to the indoor and outdoor
units. A system electrical check can now be carried out.
3. Switch on the indoor unit via the infrared/pendant
transmitter or wall mounted thermostat and check that
the fan cycles correctly. - Note, in some models there is a
2 minute fan run on time to remove residual heat from
the unit, if the unit is switched off during the heating
mode.
4. On models with microprocessor controls, check that the
High, Medium and Low fan speeds are operating
correctly by changing the fan speed via the transmitter.
5. On medium and large size units, check that the motorized
vane sweep functions correctly by toggling the function on
or off, either via the transmitter (micro units) or via the toggle
switch on the side of the electrical panel (electro-mechanical
units).
6. On micro controlled units, should it be required, check
that the built-in timer function is programmed and
operating correctly. When the timer is activated, the red
LED on the fascia display panel should be lit.