44 RT-SVX23D-EN
Start-Up
3. Add the total accessory static pressure drop (step 2) to the duct external static pressure (step
1). The sum of these two values represents the total system external static pressure.
Using the Fan Performance Tables in the Service Facts, look up the selected speed tap setting and
match the measured ESP to determine the approximate CFM.
If the required CFM is too low, (external static pressure is high) do one or both of the following and
repeat procedure:
• Relieve supply and/or return duct static.
• Change indoor fan speed tap to a higher value
If the required CFM is too high, (external static pressure is low), do one or both of the following and
repeat procedure:
• Increase supply and/or return duct static.
• Change indoor fan speed tap to a lower value.
Note: Minimum setting for units with Gas or Electric Heat is 320 CFM per Ton. For 3 & 4 Ton Gas
Heat units operating in heating mode the heat speed set cannot be lower than Speed Set 4.
4. To stop the SERVICE TEST, turn the main power disconnect switch to the "Off" position or
proceed to the next component start-up procedure.
Return Air Smoke Detector
The return air smoke detector is designed to shut off the unit if smoke is sensed in the return air
stream. Sampling the airflow entering the unit at the return air opening performs this function.
In order for the smoke detector to properly sense smoke in the return air stream, the air velocity
entering the unit must be between 500 and 4000 feet per minute. Equipment covered in this manual
will develop an airflow velocity that falls within these limits over the entire airflow range specified
in the evaporator fan performance tables.
There are certain models however, if operated at low airflow, will not develop an airflow velocity
that falls within the required 500 to 4000 feet per minute range. For these models, the design airflow
shall be greater than or equal to the minimum CFM specified in the table provided below. Failure
to follow these instructions will prevent the smoke detector from performing its design function.
Economizer Start-Up ReliaTel Control
WARNING
Rotating Components!
During installation, testing, servicing and troubleshooting of this product it may be necessary to
measure the speed of rotating components. Have a qualified or licensed service individual who
has been properly trained in handling exposed rotating components, perform these tasks.
Failure to follow all safety precautions when exposed to rotating components could result in
death or serious injury.
Using the Service Test Guide in Tab le 7 , momentarily jump across the Test 1 & Test 2 terminals on
LTB1 one time to start the Minimum Ventilation Test.
1. Set the minimum position setpoint for the economizer to the required percentage of minimum
ventilation using the setpoint potentiometer located on the Economizer Control (ECA).
The economizer will drive to its minimum position setpoint, exhaust fans (if applicable) may
start at random, and the supply fan will start when the SERVICE TEST is initiated.
The Exhaust Fan will start anytime the economizer damper position is equal to or greater than
the exhaust fan setpoint.
2. Verify that the dampers stroked to the minimum position.
3. ReliaTel Control
To Next Page
Loading...
