Honeywell VR8405 Скачать руководство пользователя страница 11 | Manualshive

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Honeywell VR8405 Скачать руководство пользователя страница 11

11

68-0150

VR8405

OPERATION • SERVICE

pressure to the main burner increases gradually from 0 in. wc
[0 kPa] to rated output pressure within 3 to 6 seconds (for an
80,000 Btuh furnace at 7 in. wc [1.8 kPa] inlet pressure and
3.5 in. wc [0.9 kPa] outlet pressure).

Step-Opening Pressure Regulation (VR8405P)

Step-opening gas controls actually combine two pres-

sure regulators, one for the low pressure and one for the
full-rate pressure. When the thermostat calls for heat, the
automatic operator valve disk opens. The low pressure
regulator maintains outlet pressure at the preset step rate for
several seconds. Then the regulator valve is forced fully
open by the timing diaphragm, which is operated by bleed
gas. When the low pressure regulator is fully open, the high

pressure regulator maintains the desired full-rate outlet
pressure as described for the standard regulator.

The step model requires approximately 60 seconds to re-

set once the main burner goes off. If it is re-energized within
60 seconds, it may bypass or shorten the length of the low
pressure step. The burner may relight at the full flow rate.

WHEN THE CALL FOR HEAT ENDS

When the calls for heat ends, the first automatic valve

and the second automatic valve operators close, bypassing
the regulator(s) and shutting off the main burner. As pres-
sure inside the gas controls and underneath the automatic
valve diaphragms equalize, spring pressure closes the second
automatic valves to provide a second barrier to gas flow.

Fig. 9—Position of gas control components during burner on cycle. Both valves are positioned the
same; one valve shown for simplicity (two main valves are energized).

FIRST
AUTOMATIC
VALVE
SOLENOID

CONTROL
KNOB

GAS
CONTROL
INLET

SECOND AUTOMATIC
VALVE OPERATOR

SECOND
AUTOMATIC
OPERATOR
SOLENOID

SECOND
AUTOMATIC
OPERATOR
VALVE DISC

SERVO PRESSURE
REGULATOR

GAS
CONTROL
OUTLET

SECOND AUTOMATIC
VALVE DIAPHRAGM

FIRST AUTOMATIC VALVE

NOTE: SECOND AUTOMATIC VALVE OPERATOR AND
SERVO PRESSURE REGULATOR SHOWN OUTSIDE
GAS CONTROL FOR EASE IN TRACING GAS FLOW.

SLOW-OPENING GAS CONTROL HAS A GAS FLOW RESTRICTOR IN THIS PASSAGE.

M9115

1

1

Service

WARNING

FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH.
Do not disassemble the gas control or either valve.
They contain no replaceable components. At-
tempted disassembly or repair will damage the gas
control.

CAUTION

Do not apply a jumper across or short the valve
leadwires. Doing so can burn out the heat antici-
pator in the thermostat or damage the DI module.

IMPORTANT: Allow 60 seconds after shutdown before

re-energizing step-opening model to assure lightoff
at step pressure.

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Содержание VR8405

Страница 1: ...t3 hour 20 3 meters3 hour Minimum capacity rated 200 feet3 hour 5 7 meters3 hour Solenoid operated dual first automatic valves open on thermostat call for heat and close when call for heat ends Diaphragm operatedsecondautomaticvalvesopen under control of the regulator and close if gas or power supply is interrupted Two position gas control knobs have ON and OFF positions All adjustments and wiring...

Страница 2: ...e ordering number or specify 1 Order Number 2 Natural or LP gas 3 Step pressure on VR8405P 4 Accessories is desired 5 Order separately transformer igniter sensor module limit controller and thermostat or controller as required If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Your local Honeywell Home and Building...

Страница 3: ...ravity natural gas at 0 25 kPa pressure drop PRESSURE REGULATION Not adjustable DIMENSIONS See Fig 1 TEMPERATURE RATING VR8405H 0 F to 175 F 18 C to 79 C VR8405M P 40 F to 175 F 40 C to 79 C PRESSURE TAPPING Inlet and outlet taps standard Taps accessible from top of control Tap is 1 8 in NPT with plug containing recess for 3 16 in Allen wrench PRESSURE RATING AGA rating 1 2 psi 3 5 kPa inlet press...

Страница 4: ...e appliance manufacturer instructions if avail able otherwise use the instructions provided below INSTALL BUSHINGS ON ENTIRE GAS CONTROL 1 Remove seals over gas control inlet or outlet 2 Apply moderate amount of good quality pipe com pound to bushing leaving two end threads bare On an LP gas installation use compound resistant to LP gas See Fig 3 Do not use Teflon tape 3 Insert bushing in entire g...

Страница 5: ...ENGTH IN IN Pipe Size Thread Pipe This Amount Maximum Depth Pipe Can Be Inserted Into Control 3 4 13 16 3 4 1 1 1 16 1 5 Remove seals over gas control inlet and outlet if necessary 6 Connect pipe to gas control inlet and outlet Use a wrench on the manifold rather than on the gas control Refer to Figs 4 and 5 WIRING Follow the wiring instructions furnished by the appli ance manufacturer if availabl...

Страница 6: ... VALVE GND TEMPERATURE CONTROLLER POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED ALTERNATE LIMIT CONTROLLER LOCATION MAXIMUM IGNITER SENSOR CABLE LENGTH 3 ft 9 m OR LESS 3 A REPLACEABLE FUSE ALARM TERMINAL PROVIDED ON SOME MODELS M8051 MVPV MVPV L1 HOT L2 1 2 1 2 3 VR8405 COMBINATION GAS CONTROL Q347 IGNITER SENSOR BURNER 4 4 5 IGNITER SENSOR AND BURNER GROUND 3 5 ALARM ...

Страница 7: ... leak is detected tighten the pipe connection 3 Stand clear while lighting main burner to prevent injury caused from hidden gas leaks that could cause flash back in the appliance vestibule Turn on the entire gas control and light the main burner as described below 4 With the main burner in operation paint all pipe joints and gas control inlet and outlet with a rich soap and water solution 5 Ifanot...

Страница 8: ...ustable Step Opening Pressure Regulator 1 The gas control outlet pressure should match the manifold pressure listed on the appliance nameplate 2 With the main burner operating check the gas con trol flow rate using the meter clocking method 3 If desired flow rate is not as stamped on the control check the inlet pressure using a manometer at inlet pres sure tap or upstream of the gas control Regula...

Страница 9: ...nce these environments can cause the gas control to deteriorate more rapidly the system should be checked more often If the gas controls will be exposed to high ammonia conditions e g those used in greenhouses or animal barns contact your Honeywell sales representative to request a gas control with corrosion resistant construction The entire gas control should be replaced if It does not perform pr...

Страница 10: ... repositions to change the flow rate through the regulator valve and thus through the automatic valve If outlet pressure begins to rise the pressure regulator diaphragm moves slightly higher allowing less gas flow to the gas control outlet This increases gas pressure under the automatic valve diaphragm and repositions the valve disc closer to the seat Thus flow of gas through the second automatic ...

Страница 11: ...operators close bypassing the regulator s and shutting off the main burner As pres sure inside the gas controls and underneath the automatic valvediaphragmsequalize springpressureclosesthesecond automatic valves to provide a second barrier to gas flow Fig 9 Position of gas control components during burner on cycle Both valves are positioned the same one valve shown for simplicity two main valves a...

Страница 12: ...appliance The information below will be of assistance in a typical control application but the specific controls used and the procedures outlined by the manufac turer of your appliance may differ and require special instructions TO TURN ON THE APPLIANCE STOP READ THE WARNING ABOVE The lighting sequence of this appliance is automatic Do not attempt to manually light the main burner If the appli anc...

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