1
68-0150
G.S. • 7-94 • ©Honeywell Inc. 1994 • Form Number 68-0150
VR8405
High Capacity Direct Ignition
Dual Automatic Valve
Combination Gas Controls
These high capacity direct ignition combina-
tion gas controls are used in gas-fired appliances.
This gas control consists of two valves assembled
in parallel on a die-cast manifold to provide high
capacity. Each valve includes a manual valve and
two automatic operators. A non-removable elec-
trical harness connects both valves. Do not alter
or remove this harness. Two pigtail leads (with
1/4-inch quick connects) provide for field con-
nection. Valves have fixed pressure regulation
and are not adjustable.
■
It is recommended that an appliance shutoff valve
be installed upstream of the VR8405.
■
Gas controls are available for natural gas and LP;
they are not convertible from one gas to another.
■
Used with S89C,E,F and S87 series 5 and later.
■
Used with 24 Vac heating appliances that burn
natural or liquefied petroleum (LP) gas.
■
Capacity rated up to 500 feet
3
/hour at 1 inch wc pres-
sure drop [14.2 meters
3
/hour at 0.25 kPa]. Maximum
capacity rated up to 720 feet
3
/hour [20.3 meters
3
/
hour]. Minimum capacity rated 200 feet
3
/hour
[5.7 meters
3
/hour].
■
Solenoid operated dual first automatic valves open
on thermostat call for heat and close when call for
heat ends.
■
Diaphragm-operated second automatic valves open
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 connections accessible
from top of the control.
■
Straight-through body pattern.
■
Available in 3/4 x 3/4 in., 3/4 x 1 in., and 1 x 1 in.
inlet and outlet.
■
Non-adjustable servo regulator effectively maintains
almost constant gas output pressure under wide fluc-
tuations in gas supply pressure.
■
Inlet screen included.
■
May be installed at any angle between 0 and 90 de-
grees from the upright position, including vertically.
■
1/4 in. male quick-connect for electrical connections.
■
-40
°
F to 175
°
F [-40
°
C to 79
°
C] temperature
range. (VR8405H 0
°
F to 175
°
F [-18
°
C to 79
°
C]).
■
Inlet and outlet pressure taps included; both taps
accessible from top of control.
■
Standard, slow and step-opening models available.
■
3/4 in. x 1 in. bushings are available to reduce the
inlet and outlet of the entire gas control.
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 4
Startup and Checkout ..................................... 7
Maintenance ................................................... 9
Operation ....................................................... 9
Service .......................................................... 11