30GTN chiller

[vinod]

30 gtn chiller showing fault code T051.
working pressures are found ok.
LP switch replaced,compressor suction gas sensor OK
throughout the day system working normally.
It found tripping on night or early morning time.

RGDS

[nike123]

What you need to know? Meaning of that code or what is wrong with chiller?

[fintan]

T051 is usually the HP switch is open. I will send you on the manual. If it is a water cooled chiller, I would be checking the sequence of the condenser pumps as the unit is tripping out at night or first thing in the morning

Ps. PM me with your email address

[professional]

30GTN means its aircoold chiller, If I assume this chiller is 2 to 3 years old there was a control relay problem, to try change the compressor A1 relay with A2 and wait for alarm, check the cond. fan compartment division sheets they are there? or missing. just check these two and come back.

[vinod]

30GTN means its aircoold chiller, If I assume this chiller is 2 to 3 years old there was a control relay problem, to try change the compressor A1 relay with A2 and wait for alarm, check the cond. fan compartment division sheets they are there? or missing. just check these two and come back.

Thanks, we changed the control relay and it found working oK. still one doubt left that how it works before the day time without any failure?

[Brian_UK]

Condenser control due low ambients causing a problem perhaps ?

[fintan]

What suction and discharge pressures are you getting during the day?

[nike123]

T051=High-pressure or loss-of charge switch open, faulty control relay or CPCS board, loss of condenser air, liquid valve closed.


Compressor Protection Control System (CPCS)
or Control Relay (CR) — 30GTN,R and 30GUN,R
040-110 — Each compressor has its own CPCS module or
CR which is standard on sizes 080-110 and optional on sizes
040-070. See Fig. 13 for CPCS module. The CPCS or CR is
used to control and protect the compressors and crankcase
heaters. The CPCS and CR provide the following functions:
• compressor contactor control
• crankcase heater control
• compressor ground current protection (CPCS only)
• status communication to processor board
• high-pressure protection
• loss-of-charge protection
One large relay is located on the CPCS board. This relay
controls the crankcase heater and compressor contactor, and
also provides a set of signal contacts that the microprocessor
monitors to determine the operating status of the compressor. If
the processor board determines that the compressor is not operating
properly through the signal contacts, it will lock the compressor
off by deenergizing the proper 24-v control relay on the
relay board. The CPCS board contains logic that can detect if
the current-to-ground of any compressor winding exceeds
2.5 amps. If this condition occurs, the CPCS shuts down the
compressor.
A high-pressure switch is wired in series between the MBB
and the CR or CPCS. On compressor A1 and B1 a loss-ofcharge
switch is also wired in series with the high-pressure
switch. If the high-pressure switch opens during operation of a
compressor, the compressor will be stopped, the failure will be
detected through the signal contacts, and the compressor will
be locked off. If the lead compressor in either circuit is shut
down by the high-pressure switch, loss-of-charge switch,
ground current protector, or oil safety switch, all compressors
in that circuit are shut down.
NOTE: The CR operates the same as the CPCS, except the
ground current circuit protection is not provided.

Check your flow rate (air ,water) and operational limits (temperature, voltage drop and imbalance).

[serviceman]

Replaces the switch of high pressure, i had that problem working the compressor and 5minutos and parrot, install manometros and verify the pressure determine failure download

[assidly09]

how much do you have to top off with the chiller running?