Commissioning Field Controllers
To commission the VMA1615/1626/1628/1630
controller, use the following procedure:
1. Download the control application to the
controller using the Controller Configuration
Tool (CCT). Refer to the
Controller Tool Help
(LIT-12011147)
.
2. Commission the VAV Box. Refer to the
Controller
Tool Help (LIT-12011147)
.
3. Perform airflow balancing on the VAV box.
Refer to the
VAV Balancing Tool Technical Bulletin
(LIT-12011087)
.
4. Perform commissioning checkout procedures.
Refer to the
Controller Tool Help (LIT-12011147)
.
You commission controllers with the CCT software.
The controller can be connected in one of four
ways; either through NxE Passthru, MAP 4.2+/
BACnet Router (Mobile Access Portal (MAP)
Gateway at version 4.2 or above), through Bluetooth
(using BTCVT), or Direct Ethernet connection
to the controller. Refer to
Controller Tool Help
(LIT-12011147)
for detailed information about
commissioning field controllers.
Note:
• The MAP Gateway serves as a replacement
for the BTCVT, which is no longer available
for purchase, but continues to be supported.
Repair information
If the controller fails to operate within its specifications, replace the unit. For a replacement unit, contact the
nearest Johnson Controls representative.
Troubleshooting
Table 8 provides LED status indicator information
for troubleshooting the controllers.
Note:
If you experience short circuits in the 24
VAC power supply causing protective devices
such as breakers or fuses to trip, make sure
that the power connections on the VMA are
not reversed. The most common cause of this
problem is when the 24 VAC power supply
on the VMA is reversed but not reversed on a
connected secondary device. Improper wiring
of this power terminal may cause a short circuit
across the 24 VAC power supply on -1 models.
Troubleshooting scenarios
Controller is Off
Power at Primary of Transformer, 0V at Secondary
or
the Power at Primary Transformer, 24V at
Secondary, 0V at Fuse/Breaker
and
Breaker/Fuse
has tripped.
Possible Cause:
1. Transformer is shorted.
2. 24VAC powered sensor is not wired with the
same polarity as the controller.
3. SA bus device is not wired with the same
polarity as the controller.
Correction:
1. Ensure polarity of ~24 V COM / ICOM / +
15VCOM/SA BUS COM on the controller,
auxiliary devices and I/O is the same.
2. Ensure OUT1-OUT3 terminals of binary outputs
are not connected to ~24 VAC COM, verify that
OCOM1-OCOM3
3. are not connected to ~24 VAC HOT (these
terminals are internally sourced).
4. Verify the short circuit has been resolved with
an ohm-meter.
5. Reset the breaker/fuse or replace the
transformer.
Note:
When replacing the transformer, it
is recommended to replace with a model
that utilizes a resettable circuit braker.
A circuit breaker makes solving wiring
problems easier.
Verification:
1. Disconnect the secondary of the 24 VAC
transformer.
2. Use an ohm-meter to measure between ~24
VAC HOT and COM; there should be no short
circuit.
VMA1615/1626/1628/1630 VAV Controllers Installation Guide
18