Advertisement
Minivap Electrical Connections
The wiring to the Minivap should be done by a qualified
electrician and the external overcurrent protection and wiring
should comply with the appropriate Regulations and Codes
of Practice. The standard Minivap unit is designed to suit
240V single phase electrical supply. Note: Minivap units for
USA/ Canada are fitted with UL/CSA rated dual Voltage
transformer and have supply Voltage options 240V and
12OV. As standard, the unit is connected for 240 V electrical
supply. For 120 V remove transformer link between H3 & H2
and fit links between H1 & H3 and H2 & H4.
External protection
A 25A fused disconnect or MCB should be used in the
electrical supply to the unit and this should be located
adjacent to the Vapac cabinet or within easy reach and
readily accessible.
Minivap Terminals (see Fig.11)
Terminals 1 and 2 are for the power supply connections.
Terminals 3 and 4 are for 24Vac supply for Vapac Supplied
Hygrostat.
Terminals 5 and 6 are for the external control circuit
connections.
Important: the external wires connected to these two
terminals (5 & 6) must be Volt-free.
Terminals A and B are for connection of an RDU (Room
Distribution Unit). Note: An RDU can only be used with
units connected to 208V or 240V.
Control Circuit Connection
The Minivap can be operated by a single step humidistat /
hygrostat which has Volt-free contacts.
Note 1: This circuit operates at 5V dc provided by the
Minivap PCB.
Note 2: Minivap terminals 3 & 4 must NOT be used for
security circuit purposes.
Security circuit
When a high limit humidistat, interlock or airflow switch are in
use, these should be wired to interrupt the power supply to
the Mininvap unit either indirectly or directly.
Cable entry
Cable glands are provided and must be used to ensure
cables are held securely at the entry position.
Output Reduction
Using a very small-bladed screwdriver, the output of the
Minivap can be reduced by a small adjustable potentiometer
mounted on the control PCB 1150608. The adjustment
range is approximately 50%-1 00% of the full output which is
set by a resistor plug called the Current set Plug or CSP
located centrally on the control PCB The full output current is
marked on the CSP.
Releasing the electrical section:
To make the electrical connections to the unit It
is necessary to detach the electrical section. To
do this, open the door, disconnect the hose and
the electrode caps from the steam cylinder, then
remove the steam cylinder from the cabinet by
lifting R out the manifold.
Next undo and remove the two screws which
hold the electrical panel to the outer cabinet (see
Fig.2) and ease the whole electrical section
forward (see Fig.3) to disengage R from the
locating slots in the back panel.
Then undo the two holding screws to release K
from its top and bottom runner. The electrical
panel is then free and can be rested at an angle
within the cabinet (see Fig.4) to allow the wiring
connections to be made to the terminal block.
Making the electrical connection
Completing the connection:
Remove the knock-outs in the top and/or side (for Minivap with RDU)
and fit the glands provided. Pass the cables through the cable glands,
make secure connections to the appropriate positions of the terminal
block then tighten the cable glands.
Note: If an RDU is fitted there is a smaller knock-out on the top and a
hard plastic grommet provided for the fan motor loads.
On completion re-attach the electrical panel to its runners, slide R back
and secure in position before replacing and reconnecting the steam
cylinder.
Important:
When replacing the cylinder make sure its O-ring seal and capping ring
are in position on the manifold
The position for the white cap (for the water level sensing electrode) is
marked by a label saying White', the electrode cable no. 1 must be put
on the electrode nearest to the white cap.
Power Supply Connection
120V; 208V or 240V
Fig 11:
Electrical
Connections
A B 1 2
Remove two screws indicated, slacken the two guide screws
then ease the electrical section forwards
Fig 12: Opening of the Electrical Section
5
Terminal Barrier
RDU
3 4 5 6
Advertisement
