2
IOM-C-CS
IV. START-UP
NOTE:
The regulator set point must be set
under normal flowing conditions.
1. CCW = Counter Clockwise,
CW = Clockwise.
2. Inspect the unit's nameplate to confirm that
the proper range spring is installed in the
reg u la tor. Apply setpoint pres sures that are
only within the stated range.
3. Start with the block valves closed. A bypass
valve may be used to maintain outlet pressure
in the down stream system while performing
the following steps.
4. Relax compression of range spring (7) by
turning handle (6) counter-clockwise (CCW)
until rotation stops. Rotate handle (6) clockwise
(CW) three (3) full revolutions to maintain
spring (7) to di a phragm(17) contact. This
reduces the outlet pres sure setpoint.
5. If piping system includes a bypass valve,
slowly open the bypass valve to preheat the
system piping and to allow slow expansion of
the piping. Ensure proper steam trap op er a tion,
if installed. To prevent overpressurization,
closely mon i tor out let (down stream) pressure
with a gauge.
NOTE:
If no bypass valve is
installed, extra caution should be used in
starting up a cold system; i.e. do everything
slowly.
6. Crack open the outlet (downstream) block
valve.
SECTION IV
7. Slowly open the inlet (upstream) block valve
ob serv ing the outlet (downstream) pressure
gauge. De ter mine if the regulator is flowing
(see NOTE above step 1)
. If no flow, rotate the
reg u la tor handle (6) CW (viewed from above)
until flow begins. De ter mine if downstream
equip ment is in operation.
8. Continue to slowly open the inlet (upstream)
block valve until fully open.
9. Continue to slowly open the outlet (down stream)
block valve. When flow is es tab lished steady
enough that the outlet (down stream) block
valve is fully open, begin to slowly close the
bypass valve, if installed, until fully closed.
10. Develop system flow to a level near its
ex pect ed normal rate and reset the regulator
setpoint by turning the handle (6) CW (viewed
from above) to increase outlet pres sure or
CCW to reduce outlet pressure.
11. Reduce system flow to a minimum level and
observe setpoint. Outlet pressure will rise from
the setpoint of Step 10. The max i mum rise
in outlet pressure on de creas ing flow should
not exceed the stated upper limit of the range
spring by greater than 30%; i.e. 10-30 psig
(.69-2.1 Barg) range spring – at low flow the
outlet pres sure should not ex ceed 39 psig (2.7
Barg). If it does, consult factory.
SECTION V
V. SHUTDOWN
1. On systems with a bypass valve, and where
system pressure is to be main tained as the
reg u la tor is shutdown, slow ly open the by pass
valve while closing the inlet block valve. Fully
close the inlet block valve. When on bypass, the
system pres sure must be con stant ly ob served
and man u al ly reg u lat ed.
2. If the regulator and system are to both be
shut down, slowly close the inlet block valve.
Close the outlet valve only if reg u la tor re mov al
is required.
2. A complete diaphragm failure will cause the
reg u la tor to fail open.
opening the port; as outlet pressure in creas es,
the diaphragm pushes up and the port closes.
DO NOT DEAD-END FLOW DOWN STREAM of
the Mod el C-CS as over pressurizing reg u la tor
may damage internals.
CAUTION
