Start-Up Procedure - Modine Manufacturing SSD Installation And Service Manual

START-UP PROCEDURE

Start-Up Procedure
IMPORTANT
Start up and adjustment procedures, installation, and service
of these appliances must be performed by a qualified
installation and service agency.
IMPORT ANT
Les procédures de démarrage et de réglage, l'installation et
le service de ces appareils doivent être confiés à un centre
d'installation et de service qualifié.
See start-up sheet example - Figure 14.1 and Figure 15.1.
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
(DX and Heat Pump units only – Digit 2,3 = SD or SH).
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 (Model Digit 8=M),
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 (Model Digit 8=M),
check that the batteries are installed in infrared/pendant
transmitter.
DX and Heat Pump 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 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 medium and large size units (Model digit 4,5=18 and
higher), check that the motorized vane sweep functions
correctly by toggling the function on or off, either via the
transmitter (microprocessor units) or via the toggle switch
on the side of the electrical panel lid (electro-mechanical
units).
5. Check the operation of the condensate pump by pouring
7-8 ounces (198 - 227 grams) of water down the pump
outlet, switch the unit on, select cooling mode and the
lowest possible temperature set point then observe the
water being pumped from the unit.
6. Where fitted, check the operation of the hot water valve
or the electrical heat elements by switching the system
to the heating mode and selecting the highest possible
temperature set point.
7. 7. The compressor signal Y1 (disconnected from the indoor
unit in step 2) can now be re-connected and main power
applied to the system.
Note:

The 24V power for the indoor unit control circuit is
supplied from a unit factory-installed transformer. When
the indoor and outdoor units are supplied from separate
main supplies, care must be taken to ensure that the
outdoor unit is isolated whenever the indoor unit power
is removed. Failure to do so may result in freeze ups
and other damage to the unit.
Chilled Water Unit – Control Circuit Checks
A thorough pipe work check and pressure test should be
performed before the unit controls are set up:
1. Isolate the unit from the chilled water supply. A system
electrical check can now be carried out.
2. 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.
3. On models with microprocessor controls (Model Digit
8=M), check that the High, Medium and Low fan speeds
are operating correctly by changing the fan speed via the
transmitter.
4. On medium and large size units (Model Digit 4,5=18 and
higher), check that the motorized vane sweep functions
correctly by toggling the function on or off, either via the
transmitter (microprocessor units) or via the toggle switch
on the side of the electrical panel lid (electro-mechanical
units).
5. On microprocessor controlled units (Model Digit 8=M),
should it be required, check that the built-in timer function
is programmed and operating correctly. When the timer
is activated, the yellow LED on the fascia display panel
should be lit.
6. Check the operation of the condensate pump by pouring
7-8 ounces (198 - 227 grams) of water down the pump
outlet, switch the unit on, select cooling mode and the
lowest possible temperature set point then observe the
water being pumped from the unit.
7. Check the operation of the chilled water valve by switching
the system to the cooling mode and forcing a call for
cooling.
8. Where fitted, check the operation of the hot water valve or
the electrical heat elements by switching the system to the
heating mode and forcing a call for heat.
9. Allow chilled water to enter the unit and vent air from the
unit by opening the 0.25 in (6.4 mm) air bleed. Re-tighten
the bleed screw once all air has been removed.
10. Repeat steps 1-9 above for all units in the same system.
The units are now ready for the system balance to be
performed.
8-504.11
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