Leslie Controls Unfired Steam Generator LVSG SERIES - Manual (Page 10)

- 10 -
Building Automation Control (BAC)
Interface
LESLIE 2001 SSCM has built in contacts to interface with
building automation control (BAC).
Remote On-Off:
Terminal block P-2 is a three pole block with two outside
poles connected in series with 24 VAC incoming power from
supply transformer. Unfired Steam Generator is shipped with
a jumper installed between terminals 1- 3 of terminal block P-
2. To wire for remote on-off remove this jumper and install a
switch or relay contacts connecting terminals 1 and 3. Do not
connect anything to terminal 2 of P-2.
Built in contacts to notify BAC of functions and alarms:
This control allows for simple and reliable interface with BAC
via dry contact to enable BAC to monitor following functions
from a remote location:
Power ON
Low water
High water
Water feed
High pressure
Low pressure
Blow down operating
Optional input / output
Alarm
Refer to “Terminal Board Layout” page of this manual for key
to and location of terminal connections to BAC. Note that all
of function relays give either a COM-NO or COM-NC dry
contact output. Rating of dry contacts are 1 amp at 24 VAC or
.5 amp at 120 VAC.
Contact closure as follows:
Operating pressure (via a 0-10 VDC signal);
Terminal block I-2 will output a 0-10 VDC signal. This
signal will be scaled to pressure range of supplied pressure
sensor. To scale BAC : Determine pressure range printed on
body of supplied sensor and scale 0-10 VDC output signal to
this range. This range should
also be listed in submittal supplied for generator.
Power ON COM - NO contact made when
power is on
Low water COM - NO contact made when in
low water condition
High water COM - NO contact made when
high water occurs
Water feed COM - NO contact made when
water is feeding
High pressure
COM - NO contact made when
high pressure occurs
Low pressure
COM - NO contact made when
low pressure occurs
Blow down
operating
COM - NO contact made when
blow down occurs
Optional input
COM - NO contact made when
optional contact close
Alarm
COM - NO contact made when any
alarm occurs
CAUTION
TERMINALS 1 -3 ARE 24 VAC AND WILL HAVE
A LOAD OF 1 AMP. BE SURE SWITCH OR
RELAY CONNECTED TO THESE TERMINALS IS
RATED FOR A MINIMUM OF 24 VAC 1 AMP
.
CAUTION
Do not connect any voltage above 120 volts across
BAC contacts on terminal block..
CAUTION
bottom terminal of 1-2 is connected to an isolated
chassis ground. This may interfere with BAC
system. BAC engineering should determine if BAC
needs isolation for this signal.
CAUTION
No current should be applied to terminals I-2.