HWH 680 Series Operator's Manual page 14

PREVOST H3 - 45 BEDROOM EXTENSION SEQUENCE
1. Ignition key must be in the "ON" position.
2. Park brake must be set.
3. Turn the room extension control panel key to "ON".
4. Any time the room extension key and ignition key is on, there
is a +12 signal to the air seal valve. The valve will open and
the air will exhaust from the seal.
5. After a 20 second delay, a ground signal will turn the amber
indicator light on the room extension panel on. The room ex-
tension will not operate until the light is on.
6. Push the Room Extension Control Switch to "RETRACT".
This will send a +12 signal for the pump relay and the room
extension solenoid valves from the control box. A +12 signal
turns the room control panel red pump on light ON when the
pump is running.
NOTE: The room control switch must be held in the "RETRACT"
position during the retract sequence. If the room control switch
is released before the sequence is complete, the sequence
will start over from Step 6 when the switch is pushed to re-
tract again.
7. A +12 signal will open the room unlock valve. This valve
will stay open during the complete retract sequence.
NOTE: Even though the room does not lock in the extended
position, the system checks to make sure the locks are fully
retracted before proceeding.
8. When the room lock pins are fully retracted, the room unlock
limit switch arrangement will send a ground signal to the control
box. The manifold pressure switch will send a ground signal to
the control box when pump pressure reaches 3000 psi. The
sequence will not continue until both signals are received by
the control box.
OPERATING PROCEDURES
ROOM RETRACT SEQUENCE
NOTE:
directly to the control box. The individual switches are con-
nected to a central limit switch indicator box for each room.
When the appropriate limit switches complete a +12 circuit for
the limit switch box, the limit switch box supplies a ground sig-
nal to the control box so the sequence can continue.
9. When both the room lock limit switches and the manifold
pressure switch signals are received by the control box, a
+12 signal will open the room retract solenoid valve.
10. When the room is fully retracted, the room in limit switch
arrangement sends a ground signal to the control box. The
manifold pressure switch sends a ground signal to the control
box when the pump pressure reaches 3000 psi. The sequence
will continue when both signals are received by the control
box.
11. When both the room in limit switches and the manifold
pressure switch signals are received by the control box, the
+12 signal to the room unlock valve is turned off and the un-
lock valve closes.
12. A +12 signal opens the room lock valve.
13. When the room lock pins are fully extended, the room lock
limit switch arrangement sends a ground signal to the control
box. The manifold pressure switch sends a ground signal to
the control box when pump pressure reaches 3000 psi.
14. When both the room lock limit switches and the manifold
pressure switch signals are received by the control box, the
pump will shut off. The red pump on light will shut off and the
sequence is complete. The room control switch may be re-
leased.
15. The air seal will inflate when the room control key switch
is turned off or if the ignition switch is turned off. The amber
light on the room control panel will go out.
The room and lock limit switches are not connected
ML21658/MP36.105B
19JAN00