Carrier 50RTG - Manual (Page 21)

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Table 21 — Aquazone D Control Current LED Status and Alarm Relay Operations
LEGEND 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 contin-
ually until the fault is cleared.
Condensate Drain Pans — Check condensate drain
pans for algae growth twice a year. If algae growth is apparent,
consult a water treatment specialist for proper chemical treat-
ment. The application of an algaecide every three months will
typically eliminate algae problems in most locations.
Refrigerant System — Verify air and water flow rates
are at proper levels before servicing. To maintain sealed circuit-
ry integrity, do not install service gauges unless unit operation
appears abnormal. Check to see that unit is within the super-
heat and subcooling ranges.
Condensate Drain Cleaning — Clean the drain line
and unit drain pan at the start of each cooling season. Check
flow by pouring water into drain. Be sure trap is filled to main-
tain an air seal.
Air Coil Cleaning — Remove dirt and debris from evap-
orator coil as required by condition of the coil. Clean coil with
a stiff brush, vacuum cleaner, or compressed air. Use a fin
comb of the correct tooth spacing when straightening mashed
or bent coil fins.
Condenser Cleaning — Water-cooled condensers may
require cleaning of scale (water deposits) due to improperly
maintained closed-loop water systems. Sludge build-up may
need to be cleaned in an open water tower system due to
induced contaminants.
Local water conditions may cause excessive fouling or
pitting of tubes. Condenser tubes should therefore be cleaned at
least once a year, or more often if the water is contaminated.
Proper water treatment can minimize tube fouling and
pitting. If such conditions are anticipated, water treatment
analysis is recommended. Refer to the Carrier System Design
Manual, Part 5, for general water conditioning information.
Clean condensers with an inhibited hydrochloric acid solu-
tion. The acid can stain hands and clothing, damage concrete,
and, without inhibitor, damage steel. Cover surroundings to
guard against splashing. Vapors from vent pipe are not harmful,
but take care to prevent liquid from being carried over by the
gases.
Warm solution acts faster, but cold solution is just as effec-
tive if applied for a longer period.
GRAVITY FLOW METHOD — Do not add solution faster
than vent can exhaust the generated gases.
When condenser is full, allow solution to remain overnight,
then drain condenser and flush with clean water. Follow acid
manufacturer’s instructions. See Fig. 8.
FORCED CIRCULATION METHOD — Fully open vent
pipe when filling condenser. The vent may be closed when
condenser is full and pump is operating. See Fig. 9.
Regulate flow to condenser with a supply line valve. If
pump is a nonoverloading type, the valve may be fully closed
while pump is running.
For average scale deposit, allow solution to remain in con-
denser overnight. For heavy scale deposit, allow 24 hours.
Drain condenser and flush with clean water. Follow acid manu-
facturer’s instructions.
DESCRIPTION
STATUS LED
(Green)
TEST LED
(Yellow)
FAULT LED (Red) ALARM RELAY
Normal Mode On Off Flash Last Fault Code in Memory Open
Normal Mode with PM On Off Flashing Code 8
Cycle (closed 5 sec,
open 25 sec, …)
D Control is non-functional Off Off Off Open
Test Mode — On Flash Last Fault Code in Memory Cycling Appropriate Code
Night Setback Flashing Code 2 — Flash Last Fault Code in Memory —
ESD Flashing Code 3 — Flash Last Fault Code in Memory —
Invalid T-stat Inputs Flashing Code 4 — Flash Last Fault Code in Memory —
No Fault in Memory On Off Flashing Code 1 Open
HP Fault Slow Flash Off Flashing Code 2 Open
LP Fault Slow Flash Off Flashing Code 3 Open
FP1 Fault Slow Flash Off Flashing Code 4 Open
FP2 Fault Slow Flash Off Flashing Code 5 Open
CO Fault Slow Flash Off Flashing Code 6 Open
Over/Under Voltage Slow Flash Off Flashing Code 7 Open (closed after 15 minutes)
HP Lockout Fast Flash Off Flashing Code 2 Closed
LP Lockout Fast Flash Off Flashing Code 3 Closed
FP1 Lockout Fast Flash Off Flashing Code 4 Closed
FP2 Lockout Fast Flash Off Flashing Code 5 Closed
CO Lockout Fast Flash Off Flashing Code 6 Closed
CO — Condensate Overflow
ESD — Emergency Shutdown
FP
— Freeze Protection
HP — High Pressure
LP — Low Pressure
PM — Performance Monitor
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.
Follow all safety codes. Wear safety glasses and rubber
gloves when using inhibited hydrochloric acid solution.
Observe and follow acid manufacturer’s instructions.