Trane Optimus RTHD, Installation, Operation And Maintenance Manual

Page: 78 / 96

Diagnostics
78 RTHD-SVX01K-EN
Heat Recovery
Entering Water
Temperature
Sensor
Heat
Recovery
Warning Latch All
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.
Remote
Heat Recovery
Leaving Water
Temperature
Sensor
Heat
Recovery
Warning Latch All
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.
Remote
Heat Recovery
Tank Water
Temperature
Sensor
Heat
Recovery
Normal Latch All
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.
Remote
Heat Recovery
Water Flow Lost
Chiller Immediate NonLatch
Start and All Run
Modes
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.
Remote
Heat Recovery
Water Flow
Overdue
Heat
Recovery
Normal NonLatch
Estab Cond Water
Flow - or for 1st 10
sec after Ignore DP
setting is reached if
Cond Wtr Flow
Proving Ignore is
enabled
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.
Remote
High Cprsr Rfgt
Discharge
Temperature
Chiller Immediate Latch
All [compressor not
running or during
compressor run
unload]
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.
Remote
High Differential
Refrigerant
Pressure
Chiller Normal Latch Chiller Energized
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
Remote
High Evaporator
Liquid Level
Chiller Normal Latch
Starter Contactor
Energized [all Stop
modes]
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)
Remote
High Evaporator
Refrigerant
Pressure
Chiller
Immediate
and Special
Action
NonLatch All
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.
Local
High Evaporator
Water
Temperature
Chiller
Warning
and Special
Action
NonLatch
Only effective if
either
1)Evap Wtr Flow
Overdue
2)Evap Wtr Flow
Loss, or
3)Low Evap Rfgt
Temp,-Unit Off,
diagnostic is active.
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.
Local
Table 26. Main processor diagnostics (continued)
Diagnostic
Name and
Source
Affects
Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level