Bell & Gossett DN0145D HS Vacuum Heating Units Series HVTM - Manual (Page 7)

PROPER ADJUSTMENT OF CONTROLS RESULTS
IN MINIMUM CONDENSATE IN RECEIVER.
CONTROLS ARE PRESET AT THE FACTORY BUT
MAY VARY DUE TO HANDLING DURING SHIPMENT.
1. Close the inlet gate valve and, with the discharge line
open, operate the pump on “continuous” or “hand” to
remove sufficient water to lower the level to about the 7
1 / 2
inch level in the water level gauge glass measured from the
top of the lower gauge cock. If necessary, admit water to
obtain the 7
1 / 2 inch level.
2. Open the disconnect switch(es).
3a. (Units equipped with one float switch.) Adjust the cut-in
point of the float switch by depressing the float arm slightly
and adjusting the stop so that the switch turns on when
the float arm is released.
3b.(Units equipped with two float switches.) Adjust the F1, or
lead, float switch in the manner described in 3a. Admit
water to a 1" higher level and adjust the F2, or stand-by,
float switch to cut in.
4. Run pump on “float or FL and VAC” unit float switch opens
and closes the discharge valve. The discharge valve is
closed when the water level in the gauge glass no longer
drops. This level should be at approximately the four inch
level. If not, adjust the float switch.
FLOA T SWITCH ADJUSTMENT PROCEDURES
7
Condensate enters the screen from the bottom and flows out-
ward from the inside. Foreign matter intercepted by the screen
may drop into the large dirt pocket in the lower portion of the
strainer body; however, grease, oil, gasket material and other
foreign substances present in all heating systems are likely to
stick and clog the strainer screen. For this reason it may be
necessary to clean the strainer several times a week during
the first few months of operation.
To clean strainer proceed as follows: (1) open disconnect
switch(es), (2) close return line gate valve, (3) remove drain
plug, (4) remove cap screws, cover and screen, (5) clean
screen thoroughly, (6) flush strainer body and dirt pocket, (7)
inspect gasket, (8) reassemble.
While the pump is shut down inspect and clean the multi-jet
nozzles as follows: (1) drain receiver below nozzle level by
removing drain plug, (2) remove discharge manifold cover
plate and multi-jet nozzle, (3) clean nozzle, (4) inspect gasket
and reassemble, (5) reprime pump to half way level in gauge
glass, (6) close switches, (7) open return line gate valve slowly.
INLET BASKET STRAINER MAINTENANCE
VACUUM GAUGE TAPPING
VACUUM BREAKER TAPPING
CAPSCREWS
COVER
GASKET
SCREEN
STRAINER BODY
DRAIN PLUG (ON REAR OF STRAINER)
THERMOMETER (ON FRONT OF STRAINER)