Overtemp; A Note About Flow - CardioQuip MCH-1000 Operators & Service Manual

11. If the water level in the tank is too high to accommodate additional ice, use the tank drain
valve or the system drain to drain excess water from the water tank.

Overtemp

WARNING: If the unit is in an overtemp condition and the emergency cool
system is used, it is critical that the operator monitor the output water
temperature.
If the output water temperature exceeds 42.5°C, the
MCH will enter overtemp mode. The system pump
will stop, the OVERTEMP screen will appear, and an
audible alarm will sound. The operator should
perform the following procedure to restore normal
operation:
1. Touch the Silence Alarm button
60 seconds. This allows
distraction of an audible signal.
2. Touch and hold the Cold Water Control button
Low pump speed and into cool mode (water flow into water tank), allowing cool water to
flow into the system at a slow rate. The overtemp condition will clear when the water
temperature decreases below 42°C.
3. Once the STANDBY screen appears, the operator can then check the temperature and
pump settings, and touch the

A Note About Flow

The main water pump used in the MCH is capable of delivering up to 60 liters per minute
(LPM) of unrestricted flow at a maximum pressure of approximately 12 psi; however, the
actual flow rate is ultimately determined by the combined restrictions of internal plumbing
and external hoses, heat exchangers, patient blankets, etc. The internal restrictions of the
MCH allow a typical maximum flow of approximately 20 LPM. Various configurations of hoses
and heat exchangers will exhibit different flow rates. For example, when connected to a
Medtronic MYOtherm™ or BIOtherm™ heat exchanger with the standard hose set, the typical
range of flow is from 5 LPM at the lowest pump speed to 12 LPM at the highest pump speed.
46 MCH OPERATION | Overtemp
. The audible alarm will silence for approximately
the operator to clear the overtemp condition without the
Run
button to return to normal operation.
. The system will change to