Replacement Valves
Table Of Contents
- SAFETY WARNINGS AND GUIDELINES FOR A QUALIFIED SERVICE TECHNICIAN
- Instructions for Selecting a Replacement Ignition Controller and/or Valve
- Serial Number and Model Codes
- Serial No. Decoding
- Serial Number Key - Month and Year of Manufacture
- Heater Serial No. PREFIX and SUFFIX Codes
- Model No. Decoding
- Safety Pilot or Ignition System Originally Supplied, Identified by Serial No. Code -- See Serial No. Decoding on pages 3-4. (N/A = Not available; see other notes below.)
- Type of Valve Originally Supplied -- See Serial No. Decoding on pages 3-4.
- Maxitrol Components for Electronic Modulation - Indirect-Fired Equipment Model Series X, SC, RG, RP, RX, RPV, and EEDU with Options AG7, AG8, AG9, AG21, AG39, AG40, AG41, or AG42
Form P-VALVES, P/N 263995, Page 22
Optional High Gas
Pressure Switch
Optional
Low Gas
Pressure
Switch
Dual, Single-Stage
Gas Valve
Ball Valve
with Actuator
Transducer
From Gas
Supply
To
Burner
Manifold Pressure Tap
AG70 Manifold in MAPS
®
III
Models RCDB/RDDB &
MAPS
®
IV Models RCDC/RDDC
with Heat Section Sizes 400,
500, 600, 700
Optional
Low Gas
Pressure
Switch
Manual Shutoff Valve
(manifold for
single-stage burner)
Manual Shutoff Valve
(modulating burner manifold)
Dual,
Single-Stage
Gas Valve
(modulating burner)
Dual, Single-Stage Gas Valve (single-stage burner)
Optional High Gas Pressure
Switch (modulating burner)
Manifold Pressure TAP
(modulating burner)
Optional High
Gas Pressure
Switch (single-
stage burner)
To modulating burner
To burner with
single-stage
control
Gas
Supply
Ball Valve
with Actuator
(modulating burner)
Pressure Switch
(modulating
burner)
AG70 Manifold in MAPS
®
III D
Cabinet Models RCDB/RDDB with
Heat Section Sizes 500, 600, 700,
800, 1000, 1200, 1400, and 1600
NOTE: P/N 222861
is the ball valve only;
actuator is P/N 222862.
43
NOTE 43 (cont'd) Ball valve and actuator in Gas Control Option AG70, AG58, and
D12G.
NOTE: P/N 222861 is the ball valve only;
actuator is P/N 222862.
NOTE: Manifold for single-stage burner
applies only to Sizes 1000, 1200, 1400 and
1600. Sizes 500, 600, 700, and 800 have
only the manifold for the modulating burner.
Top View
Side
View
Ball Valve
Actuator
Ball Valve
Actuator
Combination
Gas Valve
Pressure
Tranducer
Ball Valve
Gas Valve
Bracket
Orifice
Manifold
Pressure
Tap
Manifold in Models RDH, SHH, and RHH
with AG58 or D12G Gas Control
RDH Size
SHH and
RHH Size
Gas
Ball
Valve
Ball Valve
Actuator
175 & 200 130 & 180
Nat 255786 222862
Pro 255786 222862
225, 250,
300, 350,
& 400
250 & 350
Nat 258321 222862
Pro 258321 222862
NOTES (cont'd) for
pages 11-18, "Type
of Valve Originally
Supplied"
44
NOTE 44: When installing this valve as a replacement for a valve with a different
Serial No. Valve Code on a Model PDH, SDH, RDH, SHH, or RHH, a new valve
bracket is required.
• For PDH, SDH, and RDH Sizes 75, 100, 125, and 150, order bracket P/N
261650.
• For PDH, SDH, and RDH Sizes 175 and 200, order bracket P/N 261249
• For SHH and RHH Size 130, order bracket P/N 261650.
• For SHH and RHH Size 180, order bracket P/N 261249.
45
NOTE 45: As a result of continued product improvement, the valve that is factory
installed on these Model RDCB/RDDB heat section sizes was changed from slow
opening to standard opening effective 8/09. When replacing, the valve listed here is
the appropriate functional replacement.