Optional Heater; Installation - Teledyne 4700 Serivce Manual

2.5 Optional Heater

Tools and Supplies

2.5.1 Installation

Ensure that all wires are tucked into the pump module com-
partment and not caught between the gasket and refrigerator
wall (see Figure 2-3).
12. Replace the pump tube.
13. Perform a pump diagnostic test (see Section 5.1.5).
Under extremely cold conditions, the optional pump heater pre-
vents liquid from freezing inside the pump.
Early model 4700 Refrigerated Samplers do not have the pump
cover, a part that is required for this heater. Customers wishing
to install a heater onto one of these early samplers can contact
the factory to receive a pump cover at no charge.
Note
The heater prevents liquid from freezing only inside the pump
housing cover. In extremely cold climates, you must also route
the suction line correctly to prevent liquid from freezing in the
suction line. The suction line must have a continuous slope. Do
not allow loops or low spots in the line where liquid can remain
between samples. (This general practice applies to all climates
to prevent sample cross-contamination.)
• Heater Installation Kit:
· 68-4700-104 for 120 VAC samplers, or
· 68-4700-105 for 230 VAC samplers.
• #2 Phillips screwdriver
• Hack saw
• Fine sand paper or file
The Heater Installation Kit contains a heater, a heat shield,
self-tapping screws, and a clip to secure the AC line cord. To
install the kit:
1. Refer to Figure 2-25 and cut a notch in the pump cover
with a hack saw or similar tool. Use sand paper or a file to
remove burrs and smooth the cut edge.
4700 Refrigerated Sampler Service Guide
Section 2 Sample Delivery System
CAUTION
2-19