Bell & Gossett S14367B Technologic Constant Speed Pump Controller - Manual (Page 39)

Technologic ® Constant Speed Pump Controller Installation, Operation and Maintenance Manual 39
Section D — Procedure for Field Balancing 70E/70M PRVs
The pressure reducing valves are factory set to the discharge
pressure on the unit nameplate. If adjustment is required,
check the following:
1. Does the desired system pressure correspond to
the pressure indicated on the unit nameplate?
2. Is the suction pressure equal to or higher than the
pressure indicated on the nameplate?
3. Is the demand (GPM) within the capacity indicated
on the nameplate?
4. Have the PRV’s been properly vented?
Any deviation from the above conditions will prevent
the unit from operating at the factory settings.
WARNING: Excessive Pressure
and Temperature Hazard
Do not
operate pump(s) at or near zero flow (closed dis-
charge valve). Explosion could result. FAILURE
TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN SERIOUS PERSONAL
INJURY, DEATH, AND/OR PROPERTY
DAMAGE.
To adjust the PRV, place the pump in manual opera-
tion. See section 3.3.1. With the pump running,
slowly close the main gate valve downstream of the
discharge header, allowing a trickle of water to flow
through it. Read the system pressure on the display. It
should read 3 or 4 psi higher than the desired system
pressure. If not, remove the protective cap on the
pilot control valve and loosen the jam nut on the
adjusting stem of the PRV. Slowly turn the stem
clockwise to increase the delivery pressure and coun-
ter clockwise to decrease pressure. (Note that a pilot
valve furnished for a 20 to 300 psi range will change
the main valve setting approximately 28 psi for each
full turn of the adjusting screw.) Set the screw so the
system display reads 3 to 4 psi higher than the desired
system pressure.
Open the gate valve fully. If feasible, draw between
50 to 80% of the designed pump capacity to recheck
the valve setting. The display should now read the
desired system pressure. Tighten jam nut and replace
cap.
Repeat the above procedure for all pump and valve
combinations as required.
The CV Flow Control Valve (opening speed control)
may require field adjustment if pressure hunting
occurs. Normal setting of the valve is from 4 to 7
turns open. Never open more than 8 turns.
Section E — Electrical Wiring and Control Settings
– Final Check List
___ 1. Does the feeder line voltage correspond to the unit
voltage? Check the unit nameplate.
WARNING: Electrical shock hazard.
Inspect all electrical connections prior to
powering the unit. Wiring connections must be
made by a qualified electrician in accordance with
all applicable codes, ordinances, and good prac-
tices. FAILURE TO FOLLOW THESE
INSTRUCTIONS COULD RESULT IN
SERIOUS PERSONAL INJURY, DEATH, AND/
OR PROPERTY DAMAGE.
___ 2. Are the feeder wires correctly sized for the load?
___ 3. Are the fuses sized correctly? They should be sized for
approximately 150% of FLA and should not exceed
175%.
___ 4. Is the unit properly grounded?
WARNING: Conduit grounds are not
adequate. A separate ground wire must be
attached to the ground lug provided in the enclo-
sure to avoid potential safety hazards. FAILURE
TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN SERIOUS PERSONAL
INJURY, DEATH, AND/OR PROPERTY
DAMAGE.
___ 5. Have all the power terminals in the control panel been
checked for tightness? This is imperative since stranded
wires tend to “flow” and become loose after initial
installation.
DANGER: High voltage AC power can
kill. Disconnect and lock out power prior
to servicing unit. FAILURE TO FOLLOW
THESE INSTRUCTIONS WILL RESULT IN
SERIOUS PERSONAL INJURY, DEATH, AND/
OR PROPERTY DAMAGE.
___ 6. Are all analog and digital inputs or outputs connected
per the wiring diagram?