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
to either main or pilot burner.
PILOT, which permits gas to flow to pilot burner
only (when gas cock knob is held depressed or when
generator is heated sufficiently to hold valve open).
ON, which permits gas to flow to both main and
pilot burners when the system is calling for heat.
PILOT LIGHTING PROCEDURE
1. Slightly depress Lite-Rite knob if at PILOT
position and turn clockwise m to OFF. Wait 5
minutes for all unburned gas to vent. REMEMBER
that LP gas does not vent upward naturally.
2. Turn the Lite-Rite knob to PILOT, depress it
completely, and light the pilot burner. The knob must
be held down about one minute before the pilot
burner will stay lit after releasing the knob.
3. Turn the knob to ON, and set the thermostat
above room temperature to turn on main burner.
TEST FOR GAS LEAKS
WARNING - DO NOT OMIT THIS TEST
With main burner in operation, paint pipe joints,
pilot gas tubing connections, and valve gasket lines
with rich soap and water solution. Bubbles indicate
gas leakage. To stop leak, tighten joints and screws
or replace the gasket.
ADJUST PILOT FLAME
The pilot flame should envelop 3/8 to l/2
inch of the tip of the thermocouple. Remove
pilot adjustment cover screw (refer to Fig. 1).
Turn inner adjustment screw clockwise mto
decrease or counterclockwise n to increase
pilot flame. Be sure to replace cover after
adjustment to prevent possible gas leakage.
PROPER
3/S TO 112 INCH
CHECK GAS INPUT TO APPLIANCE
IMPORTANT
Do not exceed input rating stamped on
nameplate of appliance, or manufacturer’s
recommended burner orifice pressure for size
orifice(s) used. Make certain primary air supply
to main burner is properly adjusted for complete
combustion. Follow instructions of appliance
manufacturer if provided.
‘A” MODEL PROCEDURE (with pressure regulator)
1. Check input to main burner by clocking gas
meter or by using a pressure gauge (manometer)
connected to downstream tapping (Fig. 1). The
standard natural gas model is factory set at 3.5
inches WC outlet pressure, and the standard LP gas
model is set at 11 inches. If adjustment is required,
proceed with step 2.
2. Remove cover screw (see Fig. 1). Using
screwdriver, turn adjusting screw clockwise m to
increase or counterclockwise n to decrease gas
pressure to burner. (Note: Adjustment fitting is
plastic and may require slightly greater turning force
than metal thread.) Replace cover screw.
“B” MODEL PROCEDURE (no pressure regulator)
1. With main burner off, connect pressure gauge
(manometer) to downstream pressure tapping (Fig. 1).
2. With main burner operating, check burner
manifold pressure.
3. If pressure is not as specified by the appliance
manufacturer, readjust regulator on LP gas storage
tank.
STEP-OPENING PRESSURE REGULATOR
1°C” MODELS)
1. With main burner operating, check input by
clocking gas meter, or check burner manifold
pressure using pressure gauge (manometer)
connected to downstream pressure tapping (Fig. 1).
2. If adjustment is required, remove cover screw.
Using a small screwdriver, turn adjusting screw
clockwise m to increase or counterclockwise
n to decrease gas pressure to burner. Replace
cover screw.
3. Check burner performance at step pressure,
observing burner ignition and flame characteristics.
Burner should ignite properly and without flashback
to orifice, and all ports should remain lit. Cycle
burner several times (wait 30 seconds between
cycles to allow servo regulator to resume step
action.) Repeat after allowing appliance to cool.
NOTE: IF METER CLOCKING METHOD IS USED
Make certain there is no gas flow through the
meter other than to the appliance being checked.
Other appliances must remain off, and the pilot
extinguished (or their consumption deducted from
the meter reading).
CHECKOUT
Put the system into operation and observe through
complete cycle to be sure all controls function
properly. Make certain the Pilotstat unit shuts off gas
flow to main burner within 2-l/2 minutes after pilot
flame is extinguished.
3
PILOT GOES OUT WHEN LITE-RITE KNOB IS
RELEASED
1. Check pilot flame adjustment. See page 3.
2. Check the Powerpile generator connection to
Pilotstat power unit (Fig. 1). This is an electrical connection and must be clean and secure. Also check the
Powerpile generator connections to the valve operator.
3. If power unit still does not hold in, use the W720
Systems Tester to obtain the exact open and closed
circuit output voltages of the generator. Compare with
the Acceptable Range Charts in W720 manual or Gas
Controls Service Handbook. Next check resistance of
Pilotstat power unit.
OPERATING INSTRUCTIONS FOR THE
HOMEOWNER
‘MPORTANT
Follow the operating instructions provided by the
manufacturer of your heating appliance. The infor-
mation below will be of assistance in a typical control application, but the specific controls used and
the procedures outlined by the manufacturer of
your appliance may differ, requiring special
instructions.
LITE-RITE KNOB SETTINGS
Refer to GAS COCK SETTINGS, page 2.
If W720 or other meter is not available, first replace
generator. If this does not correct the condition
replace power unit (adjacent to gas cock knob - see
Fig. 1). Turn off gas supply to appliance (at service
cock or meter) and remove power unit with wrench.
Install and tighten new power unit. Turn on gas supply
and check for gas leakage.
COMPONENT AND PARTS REPLACEMENT
The automatic valve operators and servo regulators
may be added in the field, or replaced in service
maintenance. (Model number is stamped on side of
component.) Complete instructions are furnished with
the component.
REPLACEMENT VALVE OPERATOR: VS824A.
REPLACEMENT SERVO PRESSURE REGULATOR:
V5306 standard and V5307 step opening type.
Either models are field addable to “B” models.
VS820 “A” or “C” models can be converted to
“B” models by removing the pressure regulator and
applying a blank plate and gasket, Pt. No. 392782.
REPLACEMENT PARTS:
Pilotstat power unit (750 mv) - 392395.
Compression fitting for pilot tubing connection-
386449.
Pilot gas filter - 391158.
TO LIGHT PILOT AND TURN ON MAIN BURNER
Follow PILOT LIGHTING PROCEDURE, page 3.
TO SHUT OFF
1. For TEMPORARY situations: Main burner can be
shut off by turning clockwise m from ON to
PILOT. Pilot will remain lit - ready for return to normal service without relighting. (This is the recommended summer shutdown position.)
2. For COMPLETE SHUTDOWN: Slightly depress
Lite-Rite knob when at PILOT position and turn
clockwise m to OFF Both pilot and main burner
now are shut off.
AUTOMATIC SAFETY SHUTOFF
The automatic safety shutoff valve blocks gas flow
to the main burner and pilot burner if the pilot flame
goes out or becomes too small for adequate ignition.
If safety shutoff occurs, check pilot flame after
relighting and adjust if necessary. See ADJUST
PILOT FLAME, page 3. If shutoff reoccurs, contact
your local dealer or gas utility to correct condition
causing shutdown.
ELECTRICAL DATA:
Pilotstat Power Unit - Hold-in 15 ma maximum;
dropout 10.5 to 4.5 ma; resistance 11 ohms.
Valve Operator - Pull-in 65 ma maximum; coil
resistance 2 ohms.
This material is proprietary to Honeywell Limited and shall not be reproduced, copied or used in any manner without prior written consent of
Honeywell Limited.
HONEYWELL l 740 Ellesmere Road l Scarborough l Ontario MlP 2V9
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