Sunpower Inc. CryoTel
MT Operating Instructions version 4
13
RTD Wire Color
Wiring Harness Color
Black
Black
Red
Red
Clear
White
Green
Green
Table 1
IX. Heat Rejection
Proper heat rejection is crucial to the operation of a cryocooler. Some CryoTel heat rejection
options are a water jacket, copper fins, or a conducting solid.
CRITICAL!
Do not operate the cryocooler without adequate cooling at the heat
rejection site. Overheating the cryocooler will cause permanent damage.
A. Water Jacket
Sunpower can provide a permanent or removable water cooling jacket with the CryoTel MT
(Fig. 11 both are identical in appearance). Use a suitable thermal grease to maximize
conduction between the heat rejector and the water jacket if using a removable unit (the
permanent unit is installed at the factory and does not require thermal grease). The thermal
grease should be refreshed periodically as it will dry out over time. After connecting the water
supply to the water jacket for heat rejection, ensure that air is removed from the water jacket.
This can be done by flowing water through the cooling system for several minutes prior to the
run. If it appears that air is still trapped in the water jacket, try carefully tilting the cooler in the
direction away from the cooler discharge tube. This will raise the level of the discharge tube
and allow any trapped air to escape. Trapped air will decrease heat rejection and cooler
performance. Water should be flowing through the jacket at approximately 5mL per second
(0.08 gallons per minute).
Mating connector for temperature interface
cable is DigiKey part # WM2903.
Terminals are DigiKey part # WM2554.
RTD
Harness
PIN
Function
Wire Color Wire Color
1
I+
White (Clear) White
2
I-
Red
Red
3
V+
Black
Black
4
V-
Green
Green
5
Shield
Table 2
Pin 1
marked by
triangle
Figure 10: Controller Temperature Sensor Connector
