Flowserve StarPac 3 - Manual (Page 44)

StarPac Intelligent Control System FCD VLENIM0066-05 04/14
44
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WARNING: Observe precautions for handling electrostatic sensitive devices.
1. Make sure the valve is bypassed or in a safe condition.
2. Remove the main cover.
3. Remove the keypad assembly by removing the two retaining screws. Unplug the keypad ribbon cable from
the main PCB board and remove the keypad.
4. Remove the main PCB assembly as outlined in section 14.15.
5. Remove the user interface cover.
6. Disconnect the field wiring from the customer interface board terminals and remove the two screws (Item 19)
that hold the customer interface board in the housing (See Figure 5).
7. Remove the customer interface board by gently pulling it out of the housing.
8. Install the replacement customer interface board by sliding it into place.
9. Connect the ribbon cable on the customer interface board to the main PCB assembly. Install the main PCB
assembly as outlined in section 14.15.
10. Secure the customer interface in place with the two mounting screws (see Figure 5).
11. Reconnect the field wiring to the customer interface board terminals.
12. Install the keypad assembly and secure with the two retaining screws.
13. Reinstall all covers.
15 Optional Vented Design
A standard StarPac 3 is vented directly to the atmosphere. When supply air is substituted with sweet natural gas, piping
must be used to route the exhausted natural gas to a safe environment. This piping system may cause some positioner
back pressure in the main chamber (from the modulator) and spool chamber (from the actuator). Back pressure limita-
tions are described below.
Two chambers must be vented on the StarPac 3: the driver module and the spool valve chamber (Figures 22 and 23).
The driver module vent is located on the driver module cover. Install a tube fitting into the driver module cover (Figure
22). Connect the necessary tubing/piping to this fitting to route the exhausted natural gas to a safe environment.
The maximum allowable back pressure from the collection device on the driver module vent is 2.0 psig (0.14 barg). Vent
flow rate is 0.5 std ft3/min (1.4 std liter/min).
WARNING: The back pressure in the driver module housing must never rise above 2.0 psig (0.14 barg).
STOP!
STOP!