Bell & Gossett HS 504F Series 1141 Temperature Regulators - Manual (Page 9)

START UP PROCEDURE
1. Make sure inlet gate valve is closed.
2. Open outlet gate valve and all equipment drain
valves. Allow system to drain completely.
3. Make sure bypass globe valve (if provided)
is tightly closed.
4. Release any spring force on temperature
adjusting knob. Knob should be at the lowest
temperature setting for initial system startup.
5. Slightly open inlet valve (just enough to allow
steam or water into regulator). Do not allow
pressure to build up. On three-way valves open
cold water supply first, then open hot water
supply.
CAUTION: HEARING PROTECTION
IS REQUIRED IF DRAIN VALVES
ARE OPEN TO ATMOSPHERE.
6. Allow system to stabilize.
7. Open inlet valve more.
8. Allow system to stabilize.
9. Check for leaks.
10.Close drain valves after system is hot and drain
valves are blowing steam (indication that all
condensate has been removed), or that water
valves are passing water.
11.Open inlet valve until about half open. If there are
no problems, open completely.
12.Slowly increase the spring tension by turning the
adjusting know until the desired temperature is
reached. Allow the system to stabilize (15–30
minutes). Recheck temperature setting.
Troubleshooting:
Temperature Regulating
Problem:
1. System Temperature is Low.
a. Cause: Low inlet pressure.
Solution: Fully open supply valve. Clean strain-
er. Check for low boiler output or
upstream blockage and make
necessary corrections.
b. Cause: Capillary has kink. Sharp bend will
stop signal to pilot.
Solution: Replace actuator or work out kink by
hand.
c. Cause: Actuator range is incorrect. The
actuator will not operate beyond its
range.
Solution: Check indicator dial for correct
temperature range. Replace if
necessary.
d. Cause: Temperature adjustment altered.
Solution: Readjust to desired operating
condition.
e. Cause: Main valve undersized.
Solution: Check valve capacity against the
load. If insufficient, increase valve
size.
f. Cause: Piping flow restricted.
Solution: Calculate the flow velocity and
expected friction loss. If excessive,
larger inlet and outlet piping are
necessary.
Steam Valve Only
g. Cause: Condensate not draining.
Solution: Check steam trap for proper sizing
and operation. Trap should drain by
gravity into a vented return line. Avoid
lifts in the return lines.
h. Cause: Improper stem adjustment.
Solution: Check stem travel by following
instruction no. 8 on page 7.
i. Cause: Improper thermostatic bulb location.
Solution: Bulb must be fully into fluid flow being
controlled. Use reducer bushing
instead of reducers and nipples. In
storage tanks install the bulb near the
center of the tank. There must be flow
past the thermostatic bulb. As a rule
of thumb a recirculating pump should
provide a minimum of 20% design
load at all times.
j. Cause: Poor temperature response.
Solution: On units with separable well use high
temperature grate between the
thermostatic bulb and well for better
heat transfer.
k. Cause: Thermostatic bulb installed upside down.
Solution: See Figure No. 5 and follow bulb
installation instructions on page 3.
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