17
Fig. 19 — Fig. 19 - PC Running Field Assistant
START-UP
Besides the base unit start-up, there are a few steps to take to prop
-
erly start-up the controls. The VAV-RTU Open Service Test func
-
tion 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 acces
-
sories have been added to the unit. The factory pre-configures
options installed at the factory. There may also be additional in
-
stallation steps or inspection required during the start-up process.
VAV-RTU Open System Start-Up
Before system test mode is activated the VAV Zone terminals and
VAV-RTU Open are required to be programmed to meet the appli
-
cation. Reference the terminal controller installation and start-up
guide for configuration for specific terminals. (OPN-VAVB3 /
OPN-VAVB1) and this manual for VAV-RTU Open.
Proper addressing and programming for the units can be found in
referenced manuals prior to setting up system. Please refer to the
operation - standalone mode section for more details on accessing
occupancy setpoints.
Step 1 —
Set up the terminals minimum and maximum airflow setpoints so
that sufficient system minimum airflow is maintained in both heat
-
ing and cooling modes. Refer to the Product Data for the specific
rooftop equipment to determine those minimum values.
Step 2 —
Refer to product data for the VAV-RTU, verify the sum of the min
-
imum heat airflow setpoints for all the air terminal are 80 to 100%
of the minimum heating airflow requirement for the unit.
Step 3 —
Refer to product data for the VAV-RTU, verify the sum of the
maximum cool cfm setpoints are equal to or greater than the units
max airflow.
Step 4 —
Now the unit can be put in service test mode and the fan test used
to set minimum VFD speed. The fan will start when the fan test is
set to enable. The test runs the fan at minimum speed (default
25%) as configured in the VAV-RTU controller. During this time
all terminals will be open 70%.
The minimum VFD output is set to a factory default of 25% which
may be increased or decreased as required so that measured value
of static pressure read will be approximately 0.07 to 0.1 in. wg.
Step 5 —
Final Test and Balance can be performed with Test and Balance
software for system available from your local Carrier office. The
USB adapter and cable (USB-L) will also be required.
Additional Installation/Inspection
Inspect the field installed accessories for proper installation, mak
-
ing note of which ones do or do not require configuration changes.
Inspect the VAV-RTU Open Alarms for initial insight to any po
-
tential issues. See troubleshooting section for alarms. Inspect the
SAT sensor for relocation as intended during installation. Inspect
special wiring as directed below.
POWER EXHAUST RELAY POWER
The relay used by the VAV-RTU Open board to control power ex
-
haust 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 pro
-
vided to the J11-2 pin on the VAV-RTU Open. This can be provid
-
ed by the unit’s transformer from various sources. The “R” termi
-
nal on the unit’s Integrated Staging Control (ISC) board is a logi
-
cal source.
NOTE: Factory installed power exhaust comes pre-configured
and does not require routing 24vac as described above. This facto
-
ry installed option is only available on the following vertical air
flow units: 48/50LC*B 14-26.
Service Test
The Service Test function can be used to verify proper operation
of compressors, heating stages, indoor fan, power exhaust fans
and economizer. 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:
• Outdoor air temperature limits for cooling circuits, econo
-
mizer, and heating are ignored.
• Normal compressor time guards and other staging delays
are ignored.
• The status of Alarms (except Fire and Safety chain) is ig
-
nored, but all alerts and alarms are still broadcasted on the
network.
Connect to
computer’s
USB port
Connect to
the Local
Access port
USB Link Kit
VAV-RTU Open
Access
Port
J12
P1
P1
P5
P5
LOCAL
ACCESS
PORT
GND
GND
*Therm
mA
*Therm
mA
UI-10
UI-11
SW3
on
COMM
OPTION
CR2032
+
-
SW1
SW2
MSB
LSB
TX
RX
+12 DVC
Rnet-
Rnet+
GND
RNET
J12
J13
J15
J20
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 VAV-RTU Open Start-up Sheet
to be completed and included with the base unit check list.
Summary of Contents for 48LCB07
Page 4: ...4 Fig 2 VAV RTU Open Control Module ...
Page 8: ...8 Fig 5 VAV RTU Open Control Wiring Diagram 48LC B07 ...
Page 9: ...9 Fig 6 VAV RTU Open Control Wiring Diagram 48LC B08 12 ...
Page 10: ...10 Fig 7 VAV RTU Open Control Wiring Diagram 48LC B14 26 ...
Page 11: ...11 Fig 8 VAV RTU Open Control Wiring Diagram 50LC B07 ...
Page 12: ...12 Fig 9 VAV RTU Open Control Wiring Diagram 50LC B08 12 ...
Page 13: ...13 Fig 10 VAV RTU Open Control Wiring Diagram 50LC B14 26 ...
Page 55: ......