York D1SV300 Installation Instructions Manual page 15

5
As the air quantity required by the VAV outlet boxes de-
creases, the static pressure in the duct system increases.
Optional modulating dampers can be ordered with the urut
to provide a constant static pressure in the duct system at
all flow conditions. The optional air volume dampers are
-
controlled by the accessory static pressure regulator that
is located in the conditioned space. As the duct static pres-
sure increases above the set point, the static pressure con-
trol will modulate the air volume dampers to maintain the
static pressure setpoint.
The static pressure regulator has a range of 0.01 to 6.0
inches of water column with a differential adjustment of
0.05 to 0.75 inches. The static pressure regulator is field
connected to a terminal block in unit main control box.
CHECKING LINKAGE ON Al R VOLUME DAMPERS
After power has been supplied to the unit, the air volume
dampers should be checked to make sure they operate free-
ly and open/close properly. It may be necessary for the in-
staller to adjust the linkage between the damper motor and
the blades due to loosening in shipment.
CHECKOUT PROCEDURE
After electrical power is connected to the unit, the opera-
tion of the air volume dampers, damper motor, etc. can be
checked.
The damper motor has electric wire leads. Wires"BI",
"W1" & "R1" can be jumpered to cause the air volume
damper motor to drive to the open position or the close
-
position. The dampers and linkage should be checked for
position and linkage should be checked to insure linkage is
adjusted properly and tight with "open" and "closed"
dampers.
1. Open Dampers - Jumper terminals "R1" and "WI" on
damper motor.
2. Closed Dampers – Jumper terminals "RI" and "BI" on
damper motor.
EXHAUST AIR SYSTEM
The exhaust air fans are energized by manually closing a cir-
cuit between terminals 60 and 64 of terminal block 2TB or
automat ically by an end switch on the economizer damper
motor. As the economizer damper opens, it closes the end
switch on the damper motor and turns on the exhaust air
fans. The degree of blade opening at which the exhaust fans
are energi~ed can be adjusted by the following procedure.
Refer to Figures 13 and 14.
1.
2.
3.
4.
Use the black scale plate as an indicator of motor position
for switch operation.
Loosen the thumb nut and the cam locking screws.
Set the operational and differential cams.
Check switch adjustment by movingthe adiustor 2RH to
J
move the motor. Switch should clic~ when-desired make
and break points are lined up with index mark and the
exhaust fan should start and stop.
WARNING: 1.?0volt power is connected to the switch.
5. Tighten thumb nut.
CAUTION: Do not attempt to turn the motor shaft by hand
or with a wrench as damage to the gear train
wi[l resull.
OPERA TCOMAL
c'"~
3
DIFFERENTIAL A "
CAM
TWJMBNUT
'*
!"
SCALEPLATE
3 ,
I
.
d
SLOT IN
J
'—
SCALE
LOCK
FIG. 13 –
INTERNAL VIEW OF DAMPER
END SWITCH
MOTOR
@
STARTING POSITION
@,,, OPERATIONAL CAM
@ SET DIFFERENTIAL CAM
(d d,s,rod)
INDEX
INOEX
INDEX
CAM
SWITCH,
ONAL
IAL
ROLLER
7MENT
AM
REw
ALEPLATE
ALIGN ZERO POINT ON DESIRED SCALE
LOCATE DESIRED SWITCH MAKE POINT ON
OPPOSITE INOEX MARK 5CALEPLATE ANO ALIGN wITH INDEX
MARK TURN OPERATIONAL CAM UNTIL
ROLLER IS ON POINT OF uPPER CAM LOOE
TIGHTEN OPERATIONAL CAM SCREW
FIG. 14 –
ADJUSTING DAMPER MOTOR END SWITCH
Central Environmental Systems
SCREW
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