Operation - Johnson Controls TVS Installation Instructions

Hydronic Connections (Optional)
Hot water or steam heating coils require a male sweat
connection. Refer to the unit construction submittal
drawing for specific connection size. Use the
appropriate brazing alloy for the connection; BCuP-6
or equivalent is acceptable. Do not use soft solder.
The system water operating pressure must not exceed
300 psig.

Operation

Startup
To start the terminal, perform the following steps:
1. Verify that internal fan packing (if provided) is
removed.
2. Verify that all electrical wire terminations are
secure prior to energizing the terminal.
Notes:
•
The plenum inlet air filter (if provided) should be
installed prior to unit startup.
•
The unit fan should not be energized without
sufficient downstream resistance as indicated on
the specific fan performance curve. This is
typically 0.1 or 0.2 inches wg static pressure. Units
with electric heat require a minimum of 0.1" wg
pressure unless the specific fan curve indicates a
higher value.
•
For temporary heat, a field-fabricated perforated
baffle can be used to obtain the necessary
resistance. The manual electronic Speed
Controller Relay (SCR) should not be adjusted
downward unless the specified downstream duct
is installed and airflow capacity is verified to be
within the specified range for the unit size.
•
Prior to startup, the project specific control
sequence/wiring diagram should be obtained and
understood. If factory supplied analog or Direct
Digital Controls (DDC) are used, refer to the
applicable startup and balancing instructions.
•
The unit fan must not be balanced to a capacity
below that shown on the applicable fan
performance curve. Otherwise, the motor is not
lubricated properly, causing premature failure and
voiding of the warranty.
•
Units with electric heat require the fan capacity to
have at least 70 Cubic Feet per Minute (CFM) per
kW.
4 Parallel Flow Fan Powered Terminal (Model TVS) Installation Instructions
Air Balance
Do not balance the unit until the incoming power
supply is at the permanent voltage condition. Unless
otherwise specified, the fan motor has three speeds.
Select fan speed by placing a jumper wire on a
terminal strip located within the electrical enclosure. A
three-position rotary switch is an optional component.
Adjust units with an electronic SCR fan speed
controller using a small (1/8") flat blade screwdriver.
Running the Terminal
To run the terminal, perform the following steps:
1. Referring to the controller instructions, balance the
primary air valve to the specified maximum and
minimum airflow capacity with the unit fan
deenergized.
2. Calibrate the unit fan to be energized at the
specified primary airflow capacity or space
temperature setpoint.
3. Set the unit to the full heating condition; the
primary air valve should be at the minimum airflow
capacity and the unit fan should be on.
4. Measuring the airflow capacity downstream of the
unit, adjust the fan capacity until the total airflow
equals the sum of the minimum primary airflow
capacity and the unit fan capacity.
Notes:
•
The unit fan is shipped for low-speed operation to
optimize energy efficiency.
•
Fan capacity should be initially verified with the
electronic SCR controller potentiometer adjusted
fully clockwise. If additional capacity is required,
select medium or high speed on the fan motor by
moving the jumper wire located within the
electrical enclosure.
•
Balance fan capacity by adjusting the electronic
SCR controller counterclockwise.
•
Final fan balance should occur after the motor has
been running for 15 minutes.
•
Record incoming voltage at the time of air
balance.