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RTU Open Controller (Factory Option)
For details on operating 48FC**04-07 units equipped with the
factory-installed RTU Open controller option refer to the
Factory-Installed Option RTU Open Multi-Protocol Controller
Controls, Start-Up, Operation and Troubleshooting manual.
SystemVu™ Controller (Factory Option)
For details on operating 48FC**04-07 units equipped with the
factory-installed SystemVu controller option refer to the FC/GC
Series Single Package Rooftop Units with SystemVu Controller
Controls, Start-up, Operation and Troubleshooting manual.
Controller Options
LOW AMBIENT
If the unit comes with Electro-Mechanical (EM) control,
then no adjustment is necessary.
If the unit comes with SystemVu™ or RTU Open control-
ler option, then refer to its installation control manual for de-
tails on adjusting "Cooling Lock-Out" setting and configure
for the specific job requirements.
Smoke Detectors
Smoke detectors are available as factory-installed options
on 48FC models. Smoke detectors may be specified for Sup-
ply Air only or for Return Air without or with economizer, or
in combination of Supply Air and Return Air. Return Air
smoke detectors are arranged for vertical return configura-
tions only. All components necessary for operation are facto-
ry-provided and mounted. The unit is factory-configured for
immediate smoke detector shutdown operation; additional
wiring or modifications to unit terminal board may be neces-
sary to complete the unit and smoke detector configuration to
meet project requirements.
Units equipped with factory-optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See Fig. 52 for the as-shipped location.
STEP 1
Fig. 53 — Completing Installation of Return Air Smoke Sensor
Completing Return Air Smoke Sensor Installation
1.
Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 53, Step 1. Save the screws.
2.
Turn the assembly 90 degrees and then rotate end to end.
Make sure that the elbow fitting is pointing down. See
Fig. 53, Step 2.
3.
Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 53, Step 3.
4.
Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 52 — Return Air Smoke Detector,
Additional Application Data
Refer to the application data document "Factory Installed
Smoke Detectors for Small and Medium Rooftop Units 2 to
25 Tons" for discussions on additional control features of
these smoke detectors including multiple unit coordination.
STEP 2
41
Shipping Position
STEP 3
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