Service; Unit Inspection; System Flushing; Water Coil - Carrier 50PEC09-18 Installation, Start-Up And Service Instructions Manual

Table 14 — Aquazone™ Deluxe D Control Current LED Status and Alarm Relay Operations
DESCRIPTION
Normal Mode
Normal Mode with PM
D Control is non-functional
Test Mode
Night Setback
ESD
Invalid T-stat Inputs
No Fault in Memory
HP Fault
LP Fault
FP1 Fault
FP2 Fault
CO Fault
Over/Under Voltage
HP Lockout
LP Lockout
FP1 Lockout
FP2 Lockout
CO Lockout
LEGEND
CO — Condensate Overflow
ESD — Emergency Shutdown
FP — Freeze Protection
HP — High Pressure

SERVICE

Perform the procedures outlined below periodically, as
indicated.
WARNING
To prevent injury or death due to electrical shock or contact
with moving parts, open unit disconnect switch before ser-
vicing unit.
IMPORTANT: When a compressor is removed from this
unit, system refrigerant circuit oil will remain in the com-
pressor. To avoid leakage of compressor oil, the refrigerant
lines of the compressor must be sealed after it is removed.
IMPORTANT: All refrigerant discharged from this unit
must be recovered without exception. Technicians must fol-
low industry accepted guidelines and all local, state and fed-
eral statutes for the recovery and disposal of refrigerants.
IMPORTANT: To avoid the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit must only be
serviced by technicians who meet local, state and federal
proficiency requirements.
Visually inspect the unit at least once
Unit Inspection —
a month. Pay special attention to hose assemblies. Repair any
leaks and replace deteriorated hoses immediately. Note any
signs of deterioration or cracking.
Properly clean and flush system
System Flushing —
periodically. Refer to Pre-Start-Up, System Cleaning and
Flushing section.
Keep air out of the water coil. Check open
Water Coil —
loop systems to be sure the well head is not allowing air to in-
filtrate the water line. Always keep lines airtight.
Inspect heat exchangers regularly and clean more frequently
if the unit is located in a "dirty" environment. The heat
STATUS LED TEST LED
(Green) (Yellow)
On Off
On Off
Off Off
— On
Flashing Code 2 —
Flashing Code 3 —
Flashing Code 4 —
On Off
Slow Flash Off
Slow Flash Off
Slow Flash Off
Slow Flash Off
Slow Flash Off
Slow Flash Off
Fast Flash Off
Fast Flash Off
Fast Flash Off
Fast Flash Off
Fast Flash Off
LED — Light-Emitting Diode
LP — Low Pressure
PM — Performance Monitor
FAULT LED (Red)
Flash Last Fault Code in Memory
Flashing Code 8
Off
Flash Last Fault Code in Memory
Flash Last Fault Code in Memory
Flash Last Fault Code in Memory
Flash Last Fault Code in Memory
Flashing Code 1
Flashing Code 2
Flashing Code 3
Flashing Code 4
Flashing Code 5
Flashing Code 6
Flashing Code 7
Flashing Code 2
Flashing Code 3
Flashing Code 4
Flashing Code 5
Flashing Code 6
NOTES:
1. If there is no fault in memory, the Fault LED will flash code 1.
2. Codes will be displayed with a 10-second Fault LED pause.
3. Slow flash is 1 flash every 2 seconds.
4. Fast flash is 2 flashes every 1 second.
5. EXAMPLE: "Flashing Code 2" is represented by 2 fast flashes followed
by a 10-second pause. This sequence will repeat continually until the
fault is cleared.
exchanger should be kept full of water at all times. Open loop
systems should have an inverted P trap placed in the discharge
line to keep water in the heat exchanger during off cycles.
Closed loop systems must have a minimum of 100 kPa during
the summer and 275 kPa during the winter.
Check P trap frequently for proper operation.
FILTERS — Inspect filters. Establish a regular maintenance
schedule. Clean or replace filters frequently depending on
need.
To remove the filter from the 50PEC unit, slide the filter out
of its frame located in the return air opening at the bottom front
of the unit. When re-installing the filter, use the slide-in rails of
the filter frame to guide the filter into the proper position.
To avoid fouled machinery and extensive unit clean-up,
DO NOT operate units without filters in place. DO NOT
use equipment as a temporary heat source during
construction.
Refrigerant System —
are at proper levels before servicing. To maintain sealed circuit-
ry integrity, do not install service gages unless unit operation
appears abnormal.
Condenser Cleaning —
require cleaning of scale (water deposits) due to improperly
maintained closed-loop water systems. Open water tower
systems may require removal of sludge build-up due to
induced contaminants.
Local water conditions may cause excessive fouling or
pitting of tubes. Therefore, condenser tubes should be cleaned
at least once a year, or more often if the water is contaminated.
Use standard coil cleaning procedures which are compatible
with both the heat exchanger material and copper water lines.
Generally, the more water flowing through the unit, the less
chance for scaling, however flow rates over 3 gpm per ton can
34
ALARM RELAY
Open
Cycle (closed 5 sec, open 25 sec, ...)
Open
Cycling Appropriate Code
—
—
—
Open
Open
Open
Open
Open
Open
Open (closed after 15 minutes)
Closed
Closed
Closed
Closed
Closed
CAUTION
Verify air and water flow rates
Water-cooled condensers may