Termaline® Load Resistor
5
Flow Switch (Optional)
The ports of the flow switch are 3/4 inch NPT Female. The direction of flow is marked on the casting of the flow tube
and on the operating head. Observe carefully, opposite connection will restrict the water flow and cause load
failure.
The flow switch may be connected to the inlet or the outlet side of the load, preferably as close to the load as
possible. Be certain the flow through the switch is in the correct direction. Connect with a 1/2 inch NPT Nipple and a
1/2 to 3/4 inch bushing, Bird P/N 5-489-1 and 5-490-1, or connect by hose or pipes. In either case, the flow switch
should not be over 20 feet from the load. Alternatively, attach hose to switch with a 3/4 inch hose nipple, Bird P/N
5-903.
Do not connect flow switch leads at this time.
Turn on the water flow and check the system for leaks and proper operation.
Control Box (Optional Item)
The
wiring center
and remaining elements of the control system are contained in the control box. This includes a
terminal strip and three BX cable clamps for the input connections, a lamp, and a delay timer. Only wiring material
is needed for connecting the flow switch to the control box. The control unit operates on 115 VAC, P/N 8750-101-1.
The lamp on top of the box is a safe operation indicator; it lights only when AC power is on and an adequate water
supply is flowing. After the pilot lamp lights, a 12 ±2 second time delay allows sufficient time for the water flow to
stabilize before closing the transmitter interlock.
The control box is mounted by means of four 1/4 inch holes on a 5 x 5 inch (127 x 127 mm) square on the back.
Locate the box for the best view of the lamp and for easy attachment of the BX cable and wiring.
Connect the control leads as follows:
Water Flow switch leads to terminals 3 and 5.
Interlock Switch leads to terminals 6 and 7.
AC power source to terminals 2 and 3.
Preoperational Checkout
Before attempting to operate the RF load, whether under test or actual operating conditions, TEST the complete
water system and INTERLOCK CONTROL as follows:
1.
Make sure the AC and transmitter interlock power are OFF.
2.
Connect an ohmmeter across terminals six and seven (interlock).
3.
Turn the AC power on.
4.
Turn the water supply on.
5.
Note when the water flow switch operates (audible click),
Note:
In not less than 10 seconds (12 ±2) the ohmmeter should signify a closed condition across termi-
nals six and seven, indicating operation of the time delay switch.
6.
Ensure water flow from the OUTLET connection of load is at least 9 gpm (34 lpm) at 5° C (41° F) through 12 gpm
(45.4 lpm) at 60° C (140° F).
Note:
As a precautionary measure, the Preoperational Checkout should be performed each time the
load is put into service.
