Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500208-01 Printed in U.S.A. Form 50HC-7-12-07SI Pg 50 11-18 Replaces: 50HC-7-12-06SI
© Carrier Corporation 2018
Pre-Start and Start-Up
This completes the mechanical installation of the unit. Re-
fer to the unit’s Service Manual for detailed pre-start and
start-up instructions. Download the latest versions from
HVAC Partners (www.hvacpartners.com).
Table 20 — UltraTech Compressor (50HC07 Units)
STAGE CAPACITY METERING
LIQUID LINE
SOLENOID
COMPRESSOR
UNLOADER
FOR ULTRA TECH
COMPRESSOR
TROUBLESHOOTING
(COMPRESSOR CURRENT)
FOR LIQUID LINE SOLENOID
VALVE TROUBLESHOOTING
(TOP EVAPORATOR COIL
TEMPERATURE)
Y1
Part Load
(66%)
TXV
Closed (De-
energized)
De-energized Approx. 80% or less
Top section of the evaporator coil
will not be cold (U-bend tubes)
Y1+Y2
Full Load
(100%)
TXV+Fixed Open (Energized) Energized 100%
Top section of the evaporator coil
will be cold (U-bend tubes)
To Next Page
Loading...
