Rudd M337A Service Manual

B

C

I

NDOOR

DRAFTHOOD

31-13/16"

7

-3/4"

GAS

CONNECTION

J

A

20-1/2"

26-1/2"

ELECTRICAL

CONNECTION

3

4"

STACKLESS

OUTDOOR TOP

2

8"

4-3/8"

8-7/8"

Technical Data

Digital Low NOx Gas Heaters

CAN BE INSTALLED DIRECTLY

HEATER

ON A COMBUSTIBLE

SURFACE!

Amp Draw

120 volt 240 volt

6 3

Shipping Weights (lbs)

w/ Polymer

Headers

and Stackless

Top

Heater

Model

BTUH
Input
(000)

(A)

Cabinet

Width

(B)

Flue

Diameter

(C)

Indoor

Drafthood

(J)

Minimum Gas

Conn.

Water
Conn.

M207A 199.5 20” 6” 55-5/8” 12” 3/4” 2” 174 12
M267A 266.0 23” 7” 56” 11-1/8” 3/4” 2” 197 15
M337A 332.5 26” 8” 57” 10-3/4” 3/4” 2” 219 17
M407A 399.0 29” 9” 58-1/2” 12-1/2” 3/4” 2” 237 20

Designation for a Digital heater using propane gas is “EP”; a Digital heater using natural gas is “EN”.
Prefix “P” is for plastic (polymer) headers.
Suffix “X” is for cupro-nickel tubing; “C” is for copper Tubing
Example: P-M407A-EN-X = Plastic headers, 407 model size, digital, natural gas, cupro-nickel
For elevations above 5000 feet consult the factory.

Swimming Pool and Spa

Indoor

Draft-

hood

Heating Products

Technical Data

Features

All models

• PolyTuf Textured Powder Coating

The Rheem gas heater has a polyester-coated, non-corrosive cabinet that is more
durable than solventborne- and waterborne-coated metal cabinets. Every piece of
sheet metal goes through a 7-stage wash system, making certain the powder
paint has a perfect bond. Underneath the tough, yet beautiful finish you will find
galvanized metal that offers superior rust prevention and years of durable
service.

• Wind-Resistant Design

This heater is designed to draft naturally in outdoor installations with its
exclusive low-profile design. It is so thoughtfully and carefully designed it
actually protects itself from the things that tend to stifle ordinar
heaters. It delivers uninterrupted heating performance regardless of falling
leaves, wind, airborne debris, rain, downdrafts, updrafts, sleet, snow, etc. .

• Polymer Headers

Polymer headers prevent rust stains from harming your pool’s surface, giving you
years of trouble-free swimming pleasure.

• All-Copper

The fin tubes of the heat exchanger are each made from a single piece of extruded
copper
maintained. Cupro-nickel is also available as an optional upgrade.

• Stainless Steel T

Stainless steel tube sheets are used on all Rheem gas heaters. This allows for a
completely nonferrous waterway

• CPVC 2" Water Connections

Standard with every Rheem is a set of 2" slip-fit CPVC water connections to make
your installation secure and effortless.

• Condensation Protection

The Unitherm Governor helps reduce condensation from low inlet water
temperatures. It automatically regulates the water flow to help keep the water
temperature in the heat exchanger above 105°F
water flow rate are controlled to eliminate condensation, sooting, and scale
build-up that can shorten heater life.

• High Flow Rates

The Rheem gas heater comes with an automatic bypass built into the header.
Y

ou'll find that the heater is capable of handling water flow at a rate up to 125

gpm.

• Burner T

Every burner tray is built to last, from the stainless steel burners to the
aluminized metal used in the heat sensitive areas. Innovative design allows for
the easy removal of the tray and burners for servicing.

• Fire T

A ceramic fiber combustion box keeps your heater running efficiently while
keeping the outside jacket cool. By using this space-age material the heater
won't retain residual heat after it is turned off, allowing it to be installed without
the use of costly metal heat sinks.

• Fuel-Efficient

Energy-smart Rheem heaters consistently achieve the highest efficiency ratings.
They exceed all federal and state standards.

-Fin-Tube Heat Exchanger

. This integral-fin design allows maximum heat transfer to be attained and

ube Sheet

, leaving your pool truly rust-free.

. Both water temperature and

ray

ile

y pool and spa

• Microprocessor

The Rheem Digital gas heater features a microprocessor-based control center.
This control allows you to set your pool or spa temperature precisely at your
favorite setting just by pressing the up or down temperature control buttons.

• Self-Diagnostic

On-board diagnostic controls let the user and the service professional know what
is going on with the heater at all times. In the event that you would ever have a
problem with the heater

• Remote-Compatible

Compatible with most major pool control and remote systems on the market
today

. Any two-wire or three-wire remote can connect to the heater and be

integrated into the pool control system of your choice.

• Electronic Ignition

Rheem Digital heaters come standard with intermittent spark ignition pilot safety
controls. What this means is that the pilot only comes on when there is a call for
heat. This provides an energy-efficient way to contr
eliminating the need for a continuous pilot.

• Low Emissions

The Rheem Low NOx gas heater complies with the most stringent state and county
emissions laws. NOx emissions are less than 40 nanograms per joule.

• Fan-Assisted Combustion

A fan delivers cool, controlled combustion air to the sealed burners. Other brands
use a fan to pull hot flue gases through the heater. The Rheem design allows the
heater to outperform others during cold starts and provides longer component
life.

-Controlled Thermostat

, the digital display will indicate the source.

ol your heater’s gas usage by

Quality assurance

• ISO 9001

We are proud to be an ISO 9001 registered manufacturing plant. It’s one more
reason why Rheem is number one in the heater industry today

• End-of-Line Test

Every Rheem gas pool heater is plumbed and test-fired before it is put in the
carton. This ensures that your heater will work right out of the box and continue
to give you years of trouble-free operation.

• Quality Check Points

The Rheem assembly process includes six final assembly quality check points
that help to ensure that every Rheem gas heater is built correctly
last.

• CSA-Certified

All of Rheem’s gas pool heaters are CSA-certified and are tested by CSA to the
ANSI Z21.56/CSA 4.7 standard.

.

, and built to

In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice

Swimming Pool and Spa

Heating Products

MKG-15-1506 • 04-15-10