Startup Form
OAU-SVX006E-EN 91
Refrigeration Startup
Test Procedures
Important: Cooling startup can only be completed if the
OA temp is >65°f or <105°F. Heating startup
can only be completed if OA temp is <90°F
1. Test each circuit in
dependently.
2. Tandem or trio circuits must have all compressors on.
3. Set Digital Scroll/Variable
Spee
d command to 100%*.
4. Outdoor Air Damper open, Return Air Damper closed.
5.
Set hot gas reheat to 25%* (if installed).
6. Set outdoor air coil conditions.
a. Air Source Heat Pump or Standard DX.
i. Reduce condenser fan air flow until liquid line
pressure is 37
5-400
PSI.
b. Water Source Heat Pump.
i. Verify proper water flow
through w
ater coil.
7. Adjust charge until subcooling is 10-15.
8. Record all readings.
9. Verify HGRH operational at 100%.
10. Heat Pumps: Switch reversing valve to hea
t
ing, repeat
steps 1-8 for heating mode except with hot gas reheat
at 100%.
11. Repeat for Circuit 2.
Note: If saturated suction >67°F, you can test both circuits
at the same
time.
Units with variable speed compressor (VFD on
compressor
1)
must also be tested at 0% signal and 100%
hot gas reheat.
Circuit 1 Circuit 2
VS
Test 2
Cooling Heating Cooling Heating
Outdoor Temp (°F)
Outdoor RH (%)
Hot Gas Reheat Signal (%)
Discharge Line
Pressure (PSI)
Sat. Temp (°F)
Temp (°F)
Suction Line
Pressure (PSI)
Sat. Temp (°F)
Temp (°F)
Superheat (°F)
Liquid Line
Pressure (PSI)
Sat. Temp (°F)
Temp (°F)
Subcooling (°F)
Evaporator Leaving Temp (°F)
WSHP Only
Entering Water Temp (°F)
Leaving Water Temp (°F)
Water Coil Pressure Drop (PSI)
To Next Page
Loading...
Need help?
General