Step 7 - Fascia Assembly; Pre-Start-Up; Pre-Start Checks; Control Circuit Checks - Carrier AirStream 42WKN08-36 Installation, Operation And Maintenance Instructions

Step 7 — Fascia Assembly
Once the piping and electrical services have been connected, the 4
fascia mounting bolts can be unscrewed approximately 1 in.
(2.54 cm) from the condensate tray support channels.
The fascia can now be unpacked for fitting to the unit chassis. En-
sure the black fir tree fasteners holding the fascia polystyrene are
pushed in firmly in case of transit vibration. If using branch duct-
ing, the fascia aperture side opposite the ducting must be blanked
off. Take one of the polystyrene blanking pieces and push it into
the recess in the polystyrene fascia insulation. See Fig. 53. Install
the fascia by removing the inlet grilles and filters, locating the 4
fascia mounting bolts on the chassis through the 4 keyhole brack-
ets on the fascia and then sliding the fascia sideways until it locks
into position.
NOTE: Up to 2 non-adjacent sides can be blanked off.
Fig. 53 — Blanking Off 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 2 halves of the
vane motor's plug and socket connection (unit sizes 18-36).
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 chaffed.
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.
Reinstall filters in fascia. The inlet grilles can now be fitted to the
fascia to complete the installation.

PRE-START-UP

IMPORTANT: Start up and adjustment procedures, installa-
tion, and service of these appliances must be performed by a
qualified installation and service agency.
IMPORTANT: 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 the start-up sheet example in Fig. 54. A start-up sheet is
supplied with the unit.

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. All electrical connections (both power and control) are
properly terminated.
4. All condensate drains are installed correctly.
5. The power supply is of the correct voltage and frequency.
6. The units are properly grounded in accordance with cur-
rent electrical codes.
7. 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.
8. For microprocessor-controlled units, check that the battery
on the main circuit board is in place and properly con-
nected. Check also that the batteries are installed in infra-
red/pendant transmitter. When a pendant transmitter is
used, ensure it is properly located on to the wall mounting
bracket.

Control Circuit Checks

A thorough pipe work check and pressure test should be per-
formed 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 trans-
mitter 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 re-
move residual heat from the unit if the unit is switched off during
the heating mode.
3. 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.
4. On unit sizes 18-36, check that the motorized vane sweep
functions correctly by toggling the function on or off,
either via the transmitter (microprocessor-controlled units)
or via the toggle switch on the side of the electrical panel
lid (electro-mechanical units).
5. On microprocessor-controlled units, if 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
to 8 ounces (198 to 277 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 switch-
ing 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 1/4 in. (6.4 mm) air bleed. Re-tighten
the bleed screw once all air has been removed.
The units are now ready for the system balance to be performed.
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