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CHS-SVN011C-EN
Installation and Startup Guidelines
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this manual could result in exposure
to electrical, mechanical or other potential safety
hazards. Always refer to the safety warnings provided
throughout this manual concerning these procedures.
Unless specified otherwise, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
•
Perform a visual check on the AHU’s components.
These include, but are not limited to, fan bushing
set screws, motor mount bolts, electrical wire,
control panel handle and signs of coil damage.
WARNING
Rotating Components!
The following procedure involves working with rotating
components. Disconnect all electric power, including
remote disconnects before servicing. Follow proper
lockout/ tagout procedures to ensure the power can
not be inadvertently energized. Secure drive sheaves to
ensure rotor cannot freewheel. Failure to secure drive
sheaves or disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious injury.
•
Either the long throw adapter or a fan guard should
be in place at all times to block accidental contact
with the fan blade. If fan guard or long throw
adapter needs to be replaced or installed, make
sure all electrical power to the unit has been turned
off before any work is performed. To remove or
replace, remove the two nuts on the lowest part of
the guard or adapter first. While holding the guard
or adapter with one hand, use your other hand to
remove the top two nuts. Use both hands to remove
the guard or adapter.
•
For systems with a defrost timer clock (F0 units)
check the timer to see that it is set for the correct
time of day and starting pins have been installed.
For systems with electronic timer (F1 units) check to
make sure the correct dials have been set to the
correct time.
•
It is TRS recommendation to visually inspect the
Three Way Valve at the inlet on the coil header by
using a flashlight and making sure the valve is
aligned properly. To do this the operator would
most likely have to initiate a defrost cycle and have
the valve actuator open and close (F0) units.
•
When making water connections verify fittings are
fitted and tightened appropriately, to make sure
there is no leak within the system.
•
Keep closest vent to the coil open when filling with
fluid to allow trapped air to escape. Close the vent
valve once fluid flows out of the valve and check for
water hammer in the coil.
•
After making water connections and applying
power to the unit allow the coil to frost then
manually advance the defrost timer to initiate a
defrost cycle. Observe defrost cycle to see if all
controls are functioning properly and that the coil is
clear of all frost before the system returns to
cooling. A defrost cycle is only needed when the
frost build up is such that it impedes the airflow
through the coil. The defrost requirements will vary
in each installation and may change depending on
the time of the year and other conditions. Please
refer to the defrost section of this document for
more information on the defrost cycle.
•
In some instances ((F0) units) when the unit is first
started, the room temperature is typically above the
contact closing temperature of the fan delay
thermostat (TDT-1 on wiring diagram). To energize
the fans it may be necessary to install a temporary
jumper wire between terminals “B” and “N”. Once
the room temperature is below +25°F the jumper
wire should be removed.
•
When the system is operating, check the supply
voltage. The voltage must be /- 10% of the
voltage marked on the unit nameplate and the
phase to phase unbalance should be 2% or less.
•
Check the room thermostat setting and be sure it
functions properly.
