INSTALLATION INSTRUCTIONS
95-6999-08
V404, V504, V524, V804, and VS824
Automatic Valve Operators
APPLICATION
These valve operators provide automatic main valve
operation in the VB00, VRB00, and VR8440 families of
combination gas controls. The operators are
interchangeable and can be used either for replacement
or to add automatic operation to a C580/CS580 series
manual valve. They cannot be used on VR850 series
two-stage valves.
The V404, V804, and VSB24 are magnetic operators.
They contain an electromagnet that is energized to open
the main valve when the thermostat contacts close on a
call for heat. The V404/V804/VS824 replacement
operator package includes:
• Operator
• Operator Gasket
• Two Round Regulator Gaskets
• 388589BA Mounting Screws for Standard Capacity
Valves
The V504 and V524 are mechanical operators. They use
a bulb ·and bellows assembly filled with a temperature-
sensitive liquid to open and close the main valve. The
liquid expands and contracts with temperature changes,
expanding and contracting the bellows and operating
the valve. V504 provides modulating control; V524
provides on-off control. The V504/V524 replacement
operator package includes:
• Operator
• Operator Gasket
• 394018 Red Knob and Setscrew
• 394138 Red Knob and Setscrew
• 394075 Black Knob and Setscrew
• 388589BF Mounting Screws for Standard Capacity
Valves
The bulb and bellows assembly must be ordered
separately; see Table 2.
Longer screws are required to mount the operators on
nigh capacity valves. Obtain four screws locally as
follows:
V404, V804, VS824-No. 8-32 UNG, 1-13/16 in. V504,
V524-No. 8-32 UNG, 2-3/8 in.
Ambient temperature ratings are as follows:
V404A, V804A, VSB24A-plus 32 F to 175 F [0 C to
80 C]
V404B, V804B, VS824B-minus 40 F to plus 175 F
[minus 40 C to plus 80 C].
V504, V524-plus 32 F to 125 F [0 C to 52 C].
The V504 and V524 operators include a pressure reg-
ulator; see Table 1 for settings. A separate pres-
sure regulator is used with the V404, V804, VS824
operators.
Table 1. Automatic Valve Operator Application.
Operator
Model
Number
Pressure Regulator Setting
Control
Add-on or Replacement
Operator on:
Min. Rate
Full Rate
Adjustment
in. wc
kPa
in. wc
kPa
V504A 1.2
0.3
3.5
0.87
Limited
Mechanical
—
temperature-sensitive
bulb
C580,C581, V500, V501,
V510, V511
V504B
4.0
1.0
11.0
2.7
For LP gas
