Trane Optimus RTHD Installation, Operation And Maintenance Manual page 78

Diagnostics
Table 26. Main processor diagnostics (continued)
Diagnostic
Name and Affects
Source Target Severity
Heat Recovery
Entering Water Heat
Warning
Temperature Recovery
Sensor
Heat Recovery
Leaving Water Heat
Warning
Temperature Recovery
Sensor
Heat Recovery
Tank Water Heat
Normal
Temperature Recovery
Sensor
Heat Recovery
Chiller Immediate NonLatch
Water Flow Lost
Heat Recovery
Heat
Water Flow Normal
Recovery
Overdue
High Cprsr Rfgt
Discharge Chiller Immediate Latch
Temperature
High Differential
Refrigerant Chiller Normal
Pressure
High Evaporator
Chiller Normal
Liquid Level
High Evaporator Immediate
Refrigerant Chiller and Special
Pressure Action
High Evaporator Warning
Water Chiller and Special
Temperature Action
78
Active Modes
[Inactive
Persistence Modes]
Latch All
Latch All
Latch All
Start and All Run
Modes
Estab Cond Water
Flow - or for 1st 10
sec after Ignore DP
NonLatch setting is reached if
Cond Wtr Flow
Proving Ignore is
enabled
All [compressor not
running or during
compressor run
unload]
Latch Chiller Energized
Starter Contactor
Latch Energized [all Stop
modes]
NonLatch All
Only effective if
either
1)Evap Wtr Flow
Overdue
NonLatch 2)Evap Wtr Flow
Loss, or
3)Low Evap Rfgt
Temp,-Unit Off,
diagnostic is active.
Criteria
Bad Sensor or LLID. If heat recovery is install and it's type
is auto – informational, if heat recovery is install and it's
type is exclusive – normal Shutdown.
Bad Sensor or LLID. If heat recovery is install and it's type
is auto – informational, if heat recovery is install and it's
type is exclusive – normal Shutdown.
Bad Sensor or LLID. If heat recovery is install and it's type
is auto – informational, if heat recovery is install and it's
type is exclusive – normal Shutdown.
The Heat Recovery condenser water flow proof input was
open for more than 6 contiguous seconds after flow had
been proven. This diagnostic is automatically cleared once
the compressor is stopped by a fixed time out of 7 sec.
Heat Recovery condenser water flow was not proven within
20 minutes of the Heat Recovery condenser pump relay
being energized. The Heat Recovery Cond Pump shall be
commanded off. Diagnostic is reset with return of flow
(although only possible with external control of pump).
This diagnostic may also occur if Heat Recovery Cond Wtr
Flow Proving Ignore is enabled, and flow is not
immediately proven as the Ignore DP setting is reached.
The compressor discharge temperature exceeded 190°F.
This diagnostic will be suppressed if it occurs during the
compressor run-unload period or after the compressor has
stopped, but a run unload will be terminated early as a
result. Note: As part of the Compressor High Temperature
Limit Mode (aka Minimum Capacity Limit), the compressor
shall be forced loaded as the filtered discharge
temperature nears this trip-point.
a. The system differential pressure was above 160 Psid-
trip immediately (normal shutdown)
b. The diff pressure was above 152 Psid - trip in 1 hour
The liquid level sensor is seen to be at or near its high end
of range for 80 contiguous minutes while the compressor
is running. (The diagnostic timer will hold, but not clear
when the circuit is off). Design: 80% or more of bit count
corresponding to +21.2 mm or more liquid level for 80
minutes)
The evaporator refrigerant pressure has risen above 190
psig (future use – add "for continuous15 seconds"). The
evaporator water pump relay will be de-energized to stop
the pump regardless of why the pump is running. The
diagnostic will auto reset and the pump will return to
normal control when the evaporator pressures falls below
185 psig. This diagnostic must shutdown the chiller if it is
running.
The leaving water temperature exceeded the high evap
water temp limit (TV service menu settable –default 105F)
for 15 continuous seconds. The evaporator water pump
relay will be de-energized to stop the pump but only if it is
running due one of the diagnostics listed on the right. The
diagnostic will auto reset and the pump will return to
normal control when the temperature falls 5°F below the
trip setting. The primary purpose is to stop the evaporator
water pump and its associated pump heat from causing
excessive waterside temperatures and waterside
pressures when the chiller is not running but the evap
pump is on due to either Evap Water Flow Overdue,
Evaporator Water Flow Loss , or Low Evap Temp – Unit Off
Diagnostics. This diagnostic will not auto clear solely due
to the clearing of the enabling diagnostic.
Reset
Level
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Local
Local
RTHD-SVX01K-EN