SRUB-IOM001-EN 21
Operation and start-up
Start-up
Before start-up, confirm the following
1. Shipping spacer at compressor base if any, had been
removed.
2. Ensure sufficient cooling load is available at the day of
startup (Min. 50% design load).
3. Check if duct is firmly connected to the fan discharge with
a flexible duct. The flexible duct must be loose.
4. Check and ensure that the balancing dampers are opened.
5. Check the condition and tension of the fan belts.
6. Compressor oil should be visible in the sight glass.
7. Check voltage at all compressor terminals.
8. Check voltage imbalance. Maximum allowable voltage
imbalance, phase to phase is 2%.
To Start Unit
1. Turn on the unit power switch
2. Check the fan for direction of rotation.
3. Turn the rotary switch of the thermostat (field supplied)
to “cool” position.
Operation
Unit is operated by positioning the fan switch at “cool”
(Please ensure there are at least a minimum of 50% design
load)
Seasonal Start-up Procedure.
1. Perform the applicable procedures outlined under “Annual
maintenance” in the Maintenance section.
2. Test the entire refrigerant system for leaks.
3. Start the system.
4. Check the operation of all interlocked equipments.
5. Check the compressor oil level and system operating pres
sures after the system has stabilized (About 15 to 20
minutes).
6. Observe the flow of refrigerant through sight-glass. If bubble
appears, re-check the system for leaks.
7. Check for adequate subcooling.
Note : Normal oil level on the manifolded compressors
Could be any where from low to 3/4 of the oil sight glass.
Note : All units do not have liquid solinoid valves. Liquid
solinoid valves are not required nor recommended.
To Next Page
Need help?
General
