13
START- UP
IMPORTANT
: Follow the base unit’s start-up sequence
documented in its specific instructions. Use the base unit’s
start-up check list when performing the start-up. At the
end of this manual there is an additional RTU Open
Start-up Sheet to be completed and included with the base
unit check list.
Besides the base unit start-up, there are a few steps to take
to properly start-up the controls. RTU Open’s Service Test
function should be used to assist in the base unit start-up
and also allows verification of output operation.
Controller configuration is also part of start-up. This is
especially important when field accessories have been
added to the unit. The factory pre-configures options
installed at the factory. There may also be additional
installation steps or inspection required during the start-up
process.
Additional Installation/Inspection
Inspect the field installed accessories for proper
installation, making note of which ones do or do not
require configuration changes. Inspect the RTU Open’s
Alarms for initial insight to any potential issues. See
troubleshooting section for alarms. Inspect the SAT sensor
for relocation as intended during installation. Inspect
special wiring as directed below.
Perfect Humidity
t
Control Wiring
In units equipped with the optional Perfect Humidity
option there are 2
loose
wires (one pink and one
pink/black) in the control box used to control the
dehumidification function of the unit. These wires are
meant to be ties to a space humidistat or thermidistat on
an electromechanical unit. On RTU Open equipped units
these wires must be connected to J11-7 & 8 to allow the
Open board to operate the dehumidification function or
the unit. Disconnect the J11 Phoenix style connector form
the board and use the plug screws to secure the pink/black
wire in pin 7 and and the pink wire in pin 8, reconnect the
plug to the board at J11.
Power Exhaust Relay Power
The relay used by the RTU Open board to control power
exhaust is a dry contact which means it does not have
24vac. This 24vac must be connected to the relay to allow
it operate the power exhaust relay in the PE accessory. A
24vac source should be provided to the J11-2 pin on the
RTU Open. This can be provided by the unit’s transformer
from various sources. The “R” terminal on the unit’s
central terminal board (CTB) is a logical source.
Service Test
The Service Test function can be used to verify proper
operation of compressors, heating stages, indoor fan,
power exhaust fans, economizer, and dehumidification.
Use of Service Test is recommended at initial system start
up and during troubleshooting. See Appendix A for
Service Test Mode table.
Service Test mode has the following changes from normal
operation:
S
Outdoor air temperature limits for cooling circuits,
economizer, and heating are ignored.
S
Normal compressor time guards and other staging
delays are ignored.
S
The status of Alarms (except Fire and Safety chain) is
ignored, but all alerts and alarms are still broadcasted
on the network.
Service Test can be turned ON/OFF at the unit display or
from the network. Once turned ON, other entries may be
made with the display or through the network. To turn
Service Test on, change the value of Test Mode to ON, to
turn Service Test off, change the value of Test Mode to
OFF.
NOTE
: Service Test mode is password protected when
accessing from the display. Depending on the unit model,
factory- installed options, and field- installed accessories,
some of the Service Test functions may not apply.
Fan Test
This point allows the board’s fan output to be manually
turned On (Enable) and Off (Disable). Other test points
that require the fan for operation will automatically turn
the fan on and this point will still show “Disable.” Fan test
can operate simultaneously with other Service Test Points.
High Speed Fan Test
Use the High Speed Fan Test to activate and deactivate
the Supply Fan (BO- 1) output.
NOTE
: This output is only applicable if Fan Control is
set to Two Speed and Unit Type is not equal to HP O/B
Ctrl.
Compressor 1 and Compressor 2 Test
The compressor test points are used to change output
status for the individual compressors. Compressor starts
are not staggered. The fan and heating service test outputs
are reset to “Disable” for the compressor service tests.
The Indoor fan and outdoor fans are controlled normally
to maintain proper unit operation. All normal cooling
alarms and alerts are functional.
NOTE
: Compressor 1 is always operated with Compressor
2 due to outdoor fan control on Compressor 1. Always test
Compressor 1 first, and leave it on to test Compressor 2.
Heat 1 and Heat 2 Test
The heat test points are used to change output status for
the individual heat stages, gas or electric. The fans and
cooling service test outputs are reset to “Disable” for the
heat service tests. Indoor and outdoor fans are controlled
normally to maintain proper unit operation. All normal
heating alarms and alerts are functional.
Reversing Valve Test
This test point activates the DO7 relay at J11. These
rooftop units do not use reversing valve control for heat
pumps, therefore this test is not used.
TS
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5580
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