Bell & Gossett DN0130D Domestic Pump 250°F Condensate Units Series SA-PT - Manual (Page 3)

LOCATION
Place unit for easy access to all parts. Allow adequate space
for servicing. Check ambient conditions.
NOTICE / TEMPERATURE LIMITS
Motors are designed to operate in 104°F (40°C) max. ambient.
Insulate or ventilate as required.
PIPING (General)
Pipe the unit per the Elementary Piping Diagram. Locate and
support piping so as to not load the pump discharge.
RETURNS
Gravity return lines from system should be properly pitched to
drain to unit by gravity. A “Y” strainer and gate valve should be
installed in the return line.
PIPING (Relief Valve)
The discharge from the relief valve should be piped to a loca-
tion for safe for potential full flow steam. There must also be
provision for drainage of the liquid discharged.
THERMOSTATIC VENT TRAP OR ATMOSPHERIC VENT
Connect piping from drain line, thermostatic vent trap, and
mechanical drain valve (if so equipped) to drain. Occasionally,
Series SA units are furnished fully vented, without thermostatic
vent trap. Oversize vent openings are then supplied; install full
size vent pipe to atmosphere.
FLOAT SWITCHES & MECHANICAL ALTERNATORS
Float switch and/or displacer switches, standard or proportional,
are provided to meet system requirements.
Floats are locked in place to prevent damage during shipment.
Remove shipping locks. Check factory settings. Floats and
mechanical alternators are adjustable for various levels of oper-
ation. The lead pump should start with tank 3 /
4
full and shut off
at 2" (51mm) or more above pump inlet. Lag pump should start
before the tank overflows. Settings should avoid “short
cycling” of the pump.
Displacer positions are adjusted by removing the controller
from the top of the tank and changing cable lengths.
PROPORTIONING ELECTRIC REGULATOR
AND PROPORTIONING (SLIDE WIRE) ELECTRIC VALVE
The regulator is actuated by a float-operated mechanism. Its
function is to regulate the action of the proportioning type of
motor operated valve, so the amount of flow through the valve
is in balance with the water level change.
By accurately following the changes in the water level, the float
actuates a potentiometer slide wire located in the proportioning
regulator. Connected to a similar potentiometer in a relay and
valve operator, the regulator causes the valve to open, close, or
hold in a fixed position.
PNEUMATIC PROPORTIONING
REGULATOR AND CONTROL VALVE
The pneumatic proportional control utilizes controlled air pres-
sure to modulate the discharge valve opening. An air pressure
switch set a 2-3 psi (0.1-0.2 Bar) starts and stops the pump(s)
while the discharge valve is essentially closed.
DISCHARGE CONNECTION – SERIES SA AND SA-P UNITS
A check valve, gate valve and square head steam plug cock
should be located close to pump in discharge line. The plug
cock(s) may be omitted on Series SA-P units equipped with
proportioning discharge valves. If discharge line is more than
100 ft. (30M) long, it should usually be one size larger than the
pump tapping. When the pump is to discharge to a vented
receiver at approximately the same elevation, the steam pres-
sure in the receiver may be greater than the static head at the
pump discharge causing condensate and steam to be forced
through the pump. This condition can be corrected by installing
a back-pressure valve with a spring pressure approximately
equal to the maximum receiver pressure.
ELECTRICAL WIRING & CONTROLS
Connect power wiring per NEC. Recheck nameplate vs. spec-
ifications and conditions. All single phase motors have internal
thermal protection.
3
CAUTION: UNIT LIFTING EYE
Use unit lifting eyes only to lift unit as shipped from
factory. Unit must be empty and disconnected from pipes,
anchors and other restraints. Use proper rigging pro-
cedures. Failure to follow these instructions could result in
injury or property damage.
CAUTION: NOT A CHEMICAL PUMP
Inject boiler feed compounds from chemical feed tank
into boiler feed piping – never into condensate tank. Failure
to follow these instructions could result in injury or property
damage.
WARNING: HIGH VOLTAGE ELECTRICITY
Disconnect and lock out power before connecting or
servicing unit. Failure to follow these instructions could
result in serious injury or death.
WARNING: EXPLOSIBLE
Do not exceed pressure rating of unit (normally 15 psi
[1.0 Bar]). Do not alter or defeat relief valve (must be 15 psi
[1.0 Bar] max.). Pipe relief valve discharge to a safe location.
Failure to follow these instructions could result in serious
injury or death.
WARNING: RELIEF VALVE REQUIRED
For sale operation the system requires a relief valve
set at 15 psi (1.0 Bar) or less. The relief valve discharge must
be piped to a location where 15 psi (1.0 Bar) steam can be
safely discharged. Do not restrict, reduce or valve the relief
valve discharge line. Failure to follow these instructions
could result in serious injury or death.
WARNING: LIMITED PRESSURE RELIEF
VALVE CAPACITY
The pressure relief valve supplied on the unit may not be
sufficient to relieve rated capacity of the unit or full output of
the boiler. Relief valve supplied is rated at 1900 pph (862
Kg/hr) steam. The tank is rated to withstand 125 psi (8.5 Bar),
but the operating pressure must not exceed 15 psi (1.0 Bar).
Professional system design or evaluation, by others, must
evaluate the upstream system and provide for necessary
additional protection. Discharge thru the pressure relief
valve is a symptom of a system failure. The unit must be
valved off immediately. Failure to follow these instructions
could result in serious injury, death or extensive property
damage.