HWH 680 Series Operator's Manual page 13

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 "EXTEND". This
will send a +12 signal for the pump relay and the room exten-
sion 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 "EXTEND"
position during the extend 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 extend
again.
7. A +12 signal will open the room unlock valve. This valve
will stay open during the complete extend sequence.
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 EXTEND 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 unlock limit switches and the manifold
pressure switch signals are received by the control box, a
+12 signal will open the room extend solenoid valve.
10. When the room is fully extended, the room out 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 out limit switches and the manifold
pressure switch signals are received by the control box, the
+12 signal to the room extend valve is turned off. The extend
sequence is finished and the pump will shut off. The room con-
trol switch may be released.
12. The red pump on light will go out.
NOTE: The unlock valve will stay open for 10 seconds after
the pump shuts off, even if the room control switch is released.
13. 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/MP36.105A
19JAN00