Carrier WeatherMaster 50HC04, Service And Maintenance Instructions, Page: 55 / 132

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You can also navigate to the Alarms menu at any time.
Clearing Alarms
Once the alarm has been identified and the cause has been re-
moved (e.g. replaced faulty sensor) the alarm can be cleared
from the display.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the
(Enter) button. ERASE? displays.
3. Press the (Enter) button. ALARM ERASED displays.
4. Press the (Menu up/Exit) button to complete the
action and return to the previous menu.
If the alarm still exists after clearing it, it is redisplayed within
5 seconds.
PRE-START-UP/START-UP
Proceed as follows to inspect and prepare the unit for initial
start-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING, CAU-
TION, and INFORMATION labels attached to, or shipped
with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, or disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections
and on unit base. Detecting oil generally indicates a
refrigerant leak. Leak-test all refrigerant tubing con-
nections using electronic leak detector, halide torch,
or liquid-soap solution.
c. Inspect all field-wiring and factory-wiring connec-
tions. Be sure that connections are completed and
tight. Be sure that wires are not in contact with refrig-
erant tubing or sharp edges.
d. Inspect coil fins. If damaged during shipping and han-
dling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condenser-fan blade are correctly posi-
tioned in fan orifice. See Condenser Fan Adjustment
section for more details.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain trap is filled with
water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts
have been removed.
START-UP, GENERAL
Unit Preparation
Make sure that unit has been installed in accordance with in-
stallation instructions and applicable codes.
In addition to the base unit start-up, there are a few steps need-
ed to properly start-up the controls. RTU-OPEN’s Service Test
function should be used to assist in the base unit start-up and
also allows verification of output operation. Controller config-
uration is also part of start-up. This is especially important
when field accessories have been added to the unit. The factory
pre-configures options installed at the factory. There may also
be additional installation steps or inspection required during
the start-up process.
Additional Installation/Inspection
Inspect the field-installed accessories for proper installation,
making note of which ones do or do not require configuration
changes. Inspect the RTU-OPEN’s Alarms for initial insight to
any potential issues. Refer to the Controls, Start-up, Operation
and Troubleshooting Instructions manual. Inspect the SAT sen-
sor for relocation as intended during installation. Inspect spe-
cial wiring as directed below.
Return-Air Filters
Ensure correct filters are installed in unit (see Appendix B —
Physical Data). Do not operate unit without return-air filters.
Outdoor-Air Inlet Screens
Outdoor-air inlet screen must be in place before operating unit.
Compressor Mounting
Compressors are internally spring mounted. Do not loosen or
remove compressor hold down bolts.
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
1. Follow recognized safety practices and wear approved
Personal Protective Equipment (PPE), including safety
glasses and gloves when checking or servicing refrig-
erant system.
2. Do not use a torch to remove any component. System
contains oil and refrigerant under pressure. To remove
a component, wear PPE and proceed as follows:
d. Shut off all electrical power to unit. Apply appli-
cable lockout/tag-out procedures.
e. Recover refrigerant to relieve all pressure from
system using both high-pressure and low pressure
ports.
f. Do not use a torch. Cut component connection
tubing with tubing cutter and remove component
from unit.
g. Carefully un-sweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
3. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
4. Do not remove compressor terminal cover until all
electrical power is disconnected and approved lockout/
tag-out procedures are in place.
5. Relieve all pressure from system before touching or dis-
turbing anything inside terminal box whenever refriger-
ant leak is suspected around compressor terminals.
6. Never attempt to repair a soldered connection while
refrigerant system is under pressure.
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
The unit must be electrically grounded in accordance with
local codes and NEC ANSI/NFPA 70 (American National
Standards Institute/National Fire Protection Association).
IMPORTANT: Follow the base unit’s start-up sequence as
described in the unit’s installation instructions.