Honeywell VS820 User Manual
APPLICATION
These gas controls combine a Lite-Rite manual
gas cock, safety shutoff Pilotstat assembly,
millivoltage automatic valve operator, and optional
gas pressure regulator. They require the use of a
750 mv Powerpile generator (thermopile). The
generator, heated by the pilot burner flame, provides the electrical energy to operate the combination gas control.
A millivoltage thermostat with suitable accessory controls completes the automatic control
system for the heating appliance.
Models equipped with the standard pressure
regulator are identified by the suffix letter “A“
WS820A.j Models without pressure regulator
carry the suffix letter “6” (VS820B). Suffix letter
“C” (VS82OC) identifies models having step
opening type regulators.
Pressure regulators and operator are standardized and interchangeable on all models in the two
capacity ranges - 225 and 335 cubic feet per
hour.
MANUAL
GAS COCK
INLET STRAIGHT
\
STANDARD
OUTLET
I,
THROUGH
-4&.-W
A FLATS (VERTICAL) FOR l-7/8 INCH WRENCH
,a,,.
Fig. 2 - Piping pattern and dimensions (in inches) of
VS820.
SIZE PIPE TAPPINGS
225,000
II2
I
I
II2
PRESSURE REGULATOR ADJUSTMENT
LITE-RITE GAS COCK
MANUAL KNOB \ \
PlLOTSTAi
POWER UNIT
NOTE: 24 VOLT VALVE OPERATOR ILLUSTRATED
120 VOLT MODELS FEATURE TWO 36 INCH (914 mm) LEADS
WITH A TERMINAL COVER FOR CONDUIT CONNECTION.
(BENEATH COVER SCREW)
*PILOT GAS OUTLET.
PRESSURE TAPPING
\
PILOT FLOW ADJ. SCREW
(BENEATH COVER SCREW)
DIRECTLY BENEATH
Fig. 1 - Top view A model. Pressure regulator for “C”
model illustrated at right. (Blank cover plate
(Part No. 392782) is available to convert an
“A” model to a “B” model without pressure
regulator.)
335,000
314
I
314
I
PREPARE AND INSTALL PIPE
1. Use new, properly reamed pipe free from chips.
2. Do not thread pipe too far. Valve distortion or
malfunction may result from excess pipe within
control.
LENGTH OF STANDARD PIPE THREADS (inches)
4
3. Apply moderate amount of good quality dope to
pipe only, leaving two end threads bare. If LP gas in-
stallation, use compound resistant to action of liquified petroleum gases.
PROPER PIPING PRACTICE
2 IMPERFECT CONTROL USE MODERATE
5-83
*TRADEMARK
PRINTED IN U.S.A.
THREAD PIPE RIGHT LENGTH
LEAVE 2 END
THREADS BARE
Form Number 9!%10 0248-l
Residential Division
4. Install drip leg in gas supply pipe. (Fig. 31
DROP
DROP
I I
PIPED
t
PIPED
GAS
SUPPLY
3. Connect other end of tubing to pilot burner according to the pilot burner manufacturer’s
instructions.
WIRING
CAUTION
Never connect these millivoltage controls to
line voltage or to a transformer.
Since the entire system is powered by the
millivoltage generated by the Powerpile
generator, it is important to clean and scrape all
wires before connecting. Solder and tape all
necessary splices using rosin flux to prevent
corrosion. Tighten terminal screws. Total con-
trol circuit wiring must not exceed 30 feet of
2-wire 18 gauge cable, or 50 feet of 2-wire 16
gauge cable.
A ALL BENDS IN METALLIC TUBING SHOULD BE SMOOTH.
Fig. 3 - SEDIMENT TRAP (DRIP LEG)
INSTALLATION.
INSTALL CONTROL
1. These controls can be mounted O-90 degrees, in
any direction, from the upright position of the gas
cock knob.
2. Install the control so that gas supply is connected to the end provided with projecting boss for
wrench application. See Fig. 1.
CONNECT PILOT GAS TUBING
1. Square off and remove burrs from end of tubing.
Bend tubing to desired form for routing to pilot
burner.
GAS CONTROL BODY
TIGHTEN NUT ONE TURN
BEYOND FINGER TIGHT
TO PILOT BURNER
FERRULE BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED
t
2. Slip compression fitting over tubing and slide
out of way. Push tubing into pilot gas tapping on
outlet end of control (Fig. 1) until it bottoms. While
holding tubing all the way in, slide fitting into place
and engage threads - turn until finger tight. Then
use wrench and tighten one turn beyond finger tight.
In POWERPILE
-W
y A
L-
-k****r-----
A MUST BE APPROVED SAFETY-CIRCUIT WIRING.
A COMBINATION scREw, 114 INCH 0uicK CONNECT
TERMINAL (3).
POWERPILE OPERATOR COIL (INTERNAL WIRING).
PILOTSTAT POWER UNIT COIL (INTERNAL WIRING).
Fig. 4 -Typical Powerpile system wiring diagram.
1. Install Powerpile thermostat, limit control (if required), and Powerpile generator according to
manufacturer’s installation instructions.
2. After Powerpile generator is installed, route
generator lead to Powerpile operator and connect to
Powerpile terminals labeled PP. Make certain jumper
lead from Powerpile operator to safety shutoff
Pilotstat power unit is connected and tightened l/4
turn beyond finger tight.
3. Route wires from control circuit and connect to
the two Powerpile operator terminals labeled TH.
START-UP AND ADJUSTMENTS
GAS COCK SETTINGS (Refer to Fig. I)
The Lite-Rite gas cock knob has three settings:
OFF, prevents any gas from passing through valve
2
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