Trane Axiom EXH018, Installation And Maintenance Manual

Page: 79 / 118

WSHP-SVX01L-EN 79
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.
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.
4. Check the cooling refrigerant pressures against values
in Table 49, p. 80 .
5. Turn the thermostat system switch to the OFF position.
Unit should stop running and the reversing valve
should de-energize.
6. Leave unit off for approximately FIVE minutes to allow
for pressure equalization.
7. Turn the thermostat to the lowest setting.
8. Set the thermostat system switch to the HEAT position.
9. 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.
10. Check the heating refrigerant pressures against values
in Table 49, p. 80 .
11. Set the thermostat to maintain the desired space
temperature.
12. Instruct the owner on system operation.
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:_____________________
In order 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.
Table 48. 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
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
_________PSI
G
_________PSI
G
COMPRESSOR
Amps
Volts
Discharge line temperature (after 10
minutes)
_______F _______F