Trane Axiom EXH Series - Start-Up; Initial Unit Start-Up; Start-Up Checklist and Log; Operating Pressures

52
WSHP-SVX014J-EN
Start-Up
Initial Unit Start-Up
Note: Start-up with the heat pump thermostat is included
below:
1. Set the thermostat to the highest position.
2. Set the thermostat system switch to COOL with the fan
control to AUTO. The compressor should NOT run.
3. Reduce the thermostat setting until the compressor,
reversing valve, solenoid valve, and loop pump are
energized. Adjust water flow utilizing pressure/
temperature plugs and comparing to tables contained
in specification sheet data.
4. Water leaving the heat exchanger should be warmer
than the entering water temperature (approximately 9-
12ºF); blower operation should be smooth; compressor
and blower amps should be within data plate ratings;
the suction line should be cool with no frost observed in
the refrigerant circuit.
5. Check the cooling refrigerant pressures against values
in “Operating Pressures,” p. 52.
6. Turn the thermostat system switch to the OFF position.
Unit should stop running and the reversing valve should
de-energize.
7. Leave unit off for approximately FIVE minutes to allow
for pressure equalization.
8. Turn the thermostat to the lowest setting.
9. Set the thermostat system switch to the HEAT position.
10. Adjust the temperature setting upward until the unit is
energized. Warm air should blow from the register. A
water temperature decrease of approximately 5-9ºF
leaving the heat exchanger should be noted. The
blower and compressor operation should be smooth
with no frost observed in the refrigeration circuit.
11. Check the heating refrigerant pressures against values
in “Operating Pressures,” p. 52.
12. Set the thermostat to maintain the desired space
temperature.
13. Instruct the owner on system operation.
Table 35. Checklist
MODE Heat Cool
Entering fluid
temperature _______F _______F
Leaving fluid
temperature _______F _______F
Temperature
differential
_______F _______F
Return-air
temperature DB/WB _______F _______F
Table 35. Checklist (continued)
MODE Heat Cool
Supply-air
temperature DB/WB _______F _______F
Temperature
differential
_______F _______F
Water coil heat
exchanger (Water
Pressure IN) ________PSIG ________PSIG
Water coil heat
exchanger (Water
Pressure OUT) ________PSIG ________PSIG
Pressure Differential
_________PSIG _________PSIG
COMPRESSOR
Amps
Volts
Discharge line
temperature (after 10
minutes) _______F _______F
Start-Up Checklist and Log
Installing Contractor: Use this checklist to thoroughly
check-out the system and units before and during start-up.
(This form need not be returned to the factory unless
requested during technical service support).
Job Name:
Model Number:
Date:
Serial Number:
To minimize troubleshooting and costly system failures,
complete the following checks and data entries before the
system is put into full operation.
Operating Pressures
There are many variables (airflow, air temperatures) in an
air conditioning system that will affect operating refrigerant
pressures and temperatures. The charts below shows
approximate conditions and is based on air flow at the
rated SCFM, entering air at 80.6°F (DB), 66.2°F (WB) in
cooling, 68°F (DB) in heating. (+)Heating data with 35°F
EWT is based on the use of an anti-freeze solution having
a freezing point 20°F lower than the minimum expected
entering temperature.