Precision Control Systems ChamberIR 4069 - Manual (Page 17)

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into a disconnect relay of the power controller/system. If the WFIS "opens" (trips), the
disconnect relay of the power control system should remove power to the heater. The
WFIS is plumbed inline with the cooling line of the last reflector, before the cooling fluid
exits the heater. The WFIS has a minimum flow-rate requirement of 0.5 GPM. If the
liquid cooling flow rate falls below 0.5 GPM, the WFIS will "open", and will not "close"
if the cooling system fails to provide the minimum 0.5 GPM of cooling fluid. The WFIS
is designed to protect the heater if there is a malfunction in the cooling supply. Please
refer to Specifications for proper water-cooling rates.
Note: Flow switch is packaged internal in all but the 10-inch length models. In this case,
it is shipped separately.
HEATER "OPEN" INTERLOCK SWITCH (HILS): It is very dangerous to open the
Model 4069 while it is in operation. The heater is supplied with a Heater "Open"
Interlock Switch (HILS). The HILS is to protect an operator from the lamps of the
heater, if the operator happens to open the heater while it is in operation. The HILS
protects the operator only if the HILS is properly wired into the control interlock of the
power control system. The HILS should be wired into a disconnect relay of the power
controller/system. The HILS is a dry-contact switch mounted in the heater where the two
heater halves meet. If the heater is opened while the lamps are on, or if the lamps are in a
standby mode, the HILS will "open" (trip), not allowing the lamps to turn on. If the
HILS "opens", the disconnect relay of the power control system should remove power to
the lamps of the heater.
UNITS ORDERED WITH THE "PC" OPTION: Each Model 4069 is supplied with
two 12-foot electrical cables. When the heater is ordered with the "PC" option, the
electrical cable is terminated with a connector that plugs into a junction box. The
junction box is wired directly into the power control box with 15 feet (4.6 m) of electrical
cable. See the appendix section for electrical connections for the junction box.