Trane Horizon OADG Series User Manual

Start-Up Form
OAU-SVX007A-EN 123
Refrigeration Startup
Test Procedures
Important: Cooling startup can only be completed if the
outdoor air temperature is 65-105°F. If outdoor
air temperature is below 65°F, a bump test can
be performed with 100% return air to confirm
operation. Contact factory before adjusting
charge.
1. Test each circuit independently.
2. Tandem or trio circuits must have all compressors on, and
digital scroll/variable speed commands set to 100%.
3. Outdoor Air Damper open to 100%, Return Air Damper
closed (if installed).
4. Disable energy recovery wheel (if installed).
5. Purge the hot gas reheat coil (if installed) by setting the hot
gas reheat command to 100% for one minute, and then
immediately to 0%.
6. Allow the head pressure control to modulate the condenser
fans freely.
7. Take measurements under “Cooling” once the system has
settled.
8. If the first circuit has a VFD on compressor 1 (variable
speed compressor), repeat the measurements with the
variable speed signal at 0% and hot gas reheat at 100%.
9. Heat Pumps: Switch reversing valve to heating, repeat
steps 1-8 for heating mode except with hot gas reheat at
100%. Take measurements under the “Heating” section.
10. Repeat for Circuit 2.
a. Both circuits can be tested at the same time if outdoor
air temperature is between 80-100°F.
Check if test data below is with both circuits in operation.
Expectations
: The subcooling may vary depending on outdoor
air conditions and whether the unit is controlling the head
pressure for dehumidification mode or cooling mode. In
general, we expect that the subcooling will be higher on cooler
days and lower on warmer days. During dehumidification
mode, the head pressure setting is higher to improve reheat
capacity and will generally have higher subcooling during
testing because the hot gas reheat is manually being closed.
Circuit 1 Circuit 2
Cir 1 VS
Test 2
Cooling Heating Cooling Heating
Outdoor Temp (°F) 100
Outdoor RH (%) 100
Hot Gas Reheat Signal (%) - - 100
Suction Line
Pressure (PSI) 100
Sat. Temp (°F) 100
Temp (°F) 100
Superheat (°F) 100
Liquid Line
Pressure (PSI) 100
Sat. Temp (°F) 100
Temp (°F) 100
Subcooling (°F) 100
Evaporator Leaving Temp (°F) 100
Refrigerant Charge +/- (Contact factory before +/-) 100
WSHP Only
Entering Water Temp (°F) 100
Leaving Water Temp (°F) 100
Water Coil Pressure Drop (PSI) 100

Trane Horizon OADG Series Specifications

General

Brand	Trane
Model	Horizon OADG Series
Category	Heat Pump
Language	English