Bell & Gossett HS 504F User Manual
INSTRUCTION MANUAL
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HS-504
REVISION F
Hoffman Specialty
®
Series 1140 and 1141
Temperature Regulators
CAUTION
• FOLLOW ALL INSTALLATION AND
OPERATING INSTRUCTIONS.
• TURN OFF WATER OR STEAM
BEFORE SERVICING.
• WEAR HEAT-RESISTANT GLOVES
BEFORE MAKING ADJUSTMENTS.
• OPEN SUPPLY VALVES SLOWLY TO
PREVENT WATER HAMMER OR
SUDDEN SHOCK.
• HANDLE REGULATOR WITH
EXTREME CAUTION. DO NOT LIFT
REGULATOR BY ANY EXTERNAL
TUBING. DO NOT KINK OR TWIST
TUBING AND AVOID BENDING IT ON
A RADIUS LESS THAN 4" (100 mm).
• THE SENSING BULB MUST NOT BE
EXPOSED TO TEMPERATURES THAT
EXCEED THE RANGE LISTED ON THE
NAME PLATE.
• ALARMS OR CUT-OFFS SHOULD BE
INSTALLED ON CRITICAL
APPLICATIONS TO INDICATE
REGULATOR FAILURE. A LEAK
COULD CAUSE THE ACTUATOR TO
LOSE ITS CHARGE AND CAUSE THE
SYSTEM TO OVERHEAT.
• FAILURE TO FOLLOW THIS CAUTION
MAY RESULT IN PROPERTY DAMAGE
OR PERSONAL INJURY.
IMPORTANT: If you are uncertain as to the product’s
daptability for your application, please call the factory or
a
an authorized representative before installing or using the
product.
IMPORTANT: Do not install Series 1141 Temperature
Regulators in applications where ambient temperature
exceeds the regulator's set control temperature.
OPERATING PRINCIPLE
C
B
A
Outlet
HOT
IN
COLD
IN
C
A
Inlet
OVER 10' (3 m)
PITCH TOWARD
STEAM REGULATOR
MAIN 1/2" PER FOOT
(
15 MM PER 0.3 m)
STEAM
MAIN
TRAP
10' (3 m) OR LESS
PITCH TOWARD STEAM REGULATOR
MAIN 1/2" PER FOOT
(15 mm per 0.3 m)
STEAM
MAIN
This Series 1140 regulator automatically controls the
flow of steam, water or other medium passing through
its valve by responding to temperature changes at the
ulb. The bulb contains a liquid which vaporizes when
b
heated. Vapor pressure generated in bulb is transmitted
through the capillary tubing to the flexible bellows which
moves the valve disc or plunger controlling the flow of
the medium through the valve. Movement of the bellows
is opposed by a spring, providing a means of adjustment. The regulator only controls within the temperature
range stamped on the name plate and can be adjusted
to control at any point within its range.
Valves used to control heating cycles are direct acting,
i.e., they shut off on increase of temperature.
Valves used to control cooling cycles are reverse acting,
i.e., they open on increase of temperature.
hree-way valves are used to mix hot and cold water,
T
or as diverting valves (see Figure 3 and 4 below).
It is necessary that the sensing bulb be completely
immersed in the fluid being controlled.
VALVE INSTALLATION
Before installing confirm proper sizing.
Oversized valves will not provide good
temperature control.
The location and installation of the regulating valve is
very important. A pipe line strainer must be installed
ahead of all double seated and balanced single seated
regulators. Single seated valves have built-in removable
strainers. However, it is still good practice to install a
strainer before all regulators and to blow all lines of
foreign matter on installation. See Figure No. 1.
The regulating valve should be installed as close as
possible to the unit being controlled. The regulator must
be installed in a vertical position, the bracket assembly
above the valve body. Install valve so that arrow cast on
valve body points in direction of steam or liquid flow.
When controlling steam, the heater or coil should be
properly vented and drained. A plain bucket trap should
not be used without some provision to eliminate air from
the coil. A drip trap should be installed ahead of all
steam regulators. See Figure No. 2.
When controlling flow of water used for cooling, the
valve can be installed on the supply end and may also
be installed on the discharge end of the unit. The
position depends largely on the particular case, as some
units, such as cylinder liners, cannot stand the full line
pressure.
When mixing hot and cold water, check valves should
be used on the supplies to the three-way valve, unless
the three way valve is used directly at heat exchanger
(see Figure No. 3) then check valve need only be on the
cold water side. To avoid temperature fluctuation of
tempered water line, the thermostatic bulb should be
located as close to three-way valve as possible.
These size valves are furnished with standard capillary
tubing, 10' (3m) length: 1/2" to 2" NPT and 2-1/2" to 4"
(65 to 100 mm).
Three-way valves are sometimes used as diverting
valves. See Figure No. 4.
2
Figure No. 1 - Trapping ahead of steam regulators
Figure No. 2 - Trapping ahead of steam regulators
Figure No. 3
Series 1140,
3-way valve
mixing service
When temperature
increases piston moves
down closing port ‘B’
opening port ‘C’.
Figure No. 4
Series 1140,
3-way valve
diverting service
When temperature
increases piston moves
down closing port ‘B’
opening port ‘C’.
THERMOSTATIC BULB
BUSHING
GASKET
FLANGE
BUSHING SCREW
ARMORED CAPILLARY TUBING
1" NPT ON 1/2" TO 2" NPT VALVES
1-1/4" NPT ON 2-1/2" TO 4" (65 to 100 mm) VALVES
TOP
BULB INSTALLATION
IMPORTANT: Installing the bulb in the correct location
and position is extremely important.
The bulb should be installed at a point of actual system
temperature and it must be fully inserted in the fluid
being controlled.
Tanks - the bulb should be located approximately 2/3
the way up and off to a side of the tube nest. Bulbs
should be above the heating surface and no closer than
4" (100 mm) at any point.
Instantaneous heaters - the bulb should be installed in
the water outlet and as far into the heater as possible.
When a thermometer is used, it should be located PAST
the bulb at least 6 ft. (1.8 m) in the pipeline or on the
same level in the tank.
The bulb can be installed horizontally, vertically or in any
position in between the two, if the flange is uppermost
(see Figure No. 5). When installed horizontally, the word
"TOP" on the flange must be uppermost. See Figure
No. 6.
Figure No. 5 - Bulb Installation Positions
FOR CONTROLLING LIQUIDS
1. Remove the four (4) bushing screws.
2. Remove the bushing from the thermostatic bulb.
3. Determine the correct pipe size opening (see
Figure No. 6) and insert bushing in tank or
pipeline and tighten securely.
4. Insert bulb and gasket into bushing. Fasten with
the four (4) screws.
FOR CONTROLLING AIR
1. Install bulb on right angles to the air movement
and where an average temperature prevails.
Figure No. 6 - Bulb Mounting
(Incorrect)
(Incorrect)
(Incorrect)
3
THERMOSTATIC BULB
HOT
COLD
AS CLOSE
A
S PRACTICAL
REGULATOR
T
HERMOSTATIC BULB
TOP
MIX
B
C
A
THERMOSTATIC BULB
SEPARABLE WELL
GASKET
FLANGE
BUSHING SCREW
ARMORED CAPILLARY TUBING
DISCARD BULB BUSHING WHEN
SEPARABLE WELL IS USED.
INSTALLATION
FOR THREE-WAY VALVES
1. Install the bulb as close as possible to the outlet
of the mixed water line. See Figure No. 7.
2. Immerse bulb as far as possible into the pipeline.
ALL INSTALLATIONS
The capillary tubing is the flexible tubing that connects
the bulb and the valve.
IMPORTANT: Capillary tubing may only be bent on a
4" (100 mm), or larger radius. It must never be cut,
kinked, smashed or twisted.
1. Permanently fasten the capillary tubing to a
permanent location other than steam pipes, cold
water lines, or any other place where extreme
temperatures are incurred.
2. Form a loop with a few turns of tubing and place
next to the regulator. This helps to absorb vibrations in the pipeline.
Figure No. 7 - Three-Way Valve
SEPARABLE WELL INSTALLATION
Separable wells protect the bulb and allow the bulb to be
removed without draining the pipeline or tank.
1. Install separable well in tank or piping.
2. Coat sensing bulb with high temperature grease.
3. Insert sensing bulb and gasket into the separable well.
4. Securely tighten with four (4) mounting screws.
Figure No. 8 - Separable Well Installation
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