Rheem Raypak MVB 503A User manual

󰀨


Models 503A–2003A
Types H & WH
INSTALLATION AND
OPERATION MANUAL
WARNING:Improper installation, adjustment, alteration, service or maintenance can
cause property damage, personal injury, exposure to hazardous materials* or loss of
life. Review the information in this manual carefully. *This unit contains materials that
have been identified as carcinogenic, or possibly carcinogenic, to humans.
FOR YOUR SAFETY: Do not store or use gasoline or other flammable vapors and liquids
or other combustible materials in the vicinity of this or any other appliance. To do so
may result in an explosion or fire.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
 

the gas supplier.
















CONTENTS
1. WARNINGS ............................................................. 4
 
2. GENERAL SAFETY................................................ 5
 
3. BEFORE INSTALLATION...................................... 6
 
 
 
 
 
4. INSTALLATION....................................................... 8
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
5. CONTROLS........................................................... 31
 
6. WIRING DIAGRAM............................................... 40
7. START-UP.............................................................. 41
 
 
 
 
 
 
 
8. OPERATION.......................................................... 46
 
󰀨 
9. TROUBLESHOOTING ......................................... 46
 
 
 
 
10. MAINTENANCE.................................................... 49
 
 
11. ILLUSTRATED PARTS LIST............................... 52


ADANGER: Make sure the gas on which the heater will

rating plate.
AWARNING: Should overheating occur or the gas
        󰀨  
   󰀨
gas supply at a location external to the heater.
AWARNING: Do not use this heater if any part has
       
technician to inspect the heater and to replace any part
of the control system and any gas control which has
been under water.
AWARNING: To minimize the possibility of improper

heater:
• Always keep the area around the heater free
of combustible materials, gasoline, and other
flammable liquids and vapors.
• Heater should never be covered or have any
blockage to the flow of fresh air to the heater.
AWARNING: Risk of electrical shock. More than one
disconnect switch may be required to de-energize the
equipment before servicing.
ACAUTION: This heater requires forced water
circulation when the burner is operating. See minimum


ACAUTION: Operation of this heater in low
temperature systems requires special piping. Harmful
internal condensation will occur if the inlet water
temperature does not exceed 120°F (49°C). Warranty
claims will be denied when condensation occurs.
ACAUTION: If this heater is to be installed above
radiation level, it must be provided with a low water cut-
󰀨
ACAUTION: If this heater is to be installed in a negative
or positive pressure equipment room, there are special
installation requirements. Consult factory for details.
1. WARNINGS
Pay Attention to These Terms
AWARNING: UL recognized fuel gas detectors are
recommended in all enclosed propane and natural gas
applications wherein there is a potential for an explosive
mixture of fuel gas to accumulate and their installation
should be in accordance with the detector manufacturer’s
recommendations and/or local laws, rules, regulations,
or customs.
AWARNING: Both natural gas and propane have
an odorant added to aid in detecting a gas leak. Some
people may not physically be able to smell or recognize
this odorant. If you are unsure or unfamiliar with the
smell of natural gas or propane, ask your local gas
supplier. Other conditions, such as “odorant fade,”
which causes the odorant to diminish in intensity, can
       
󰀩
ADANGER              

AWARNING 

ACAUTION 

CAUTION 

NOTE 



Water temperature over 125°F can
cause instant severe burns or death
from scalds.
Children, disabled, and elderly are
at highest risk of being scalded.
See instruction manual before set-
ting temperature at water heater.
Feel water before bathing or show-
ering.
Temperature limiting valves are
available, see manual.
2. GENERAL SAFETY
NOTE: When this water heater is supplying
general purpose hot water for use by individuals, a
thermostatically-controlled mixing valve for reducing
point of use water temperature is recommended to reduce
the risk of scald injury. Contact a licensed plumber or the
local plumbing authority for further information.
ACAUTION: Hotter water increases the risk of
scalding! There is a hot water scald potential if the
thermostat is set too high.
    
󰀨

      
   
     







       
       
󰀩
   

 


 
 

󰀨
         
         

Time/Temperature
Relationships in Scalds
       
     
       
Table A

     ®   



   page 31 

Water Temp. Time to Produce Serious Burns
 
 
 
 
 
 
 
 

Table A. Time to Produce Serious Burn


3. BEFORE INSTALLATION

      
      
        




        
       




Product Receipt

         
󰀨
  


         
        




       
   

        




   




         
        
        


        
      

      


Standards:
 

        

 

 
 
   





         


AWARNING: Altering any Raypak pressure vessel
by installing replacement heat exchangers, tube bundle
headers, or any ASME parts not manufactured and/or
approved by Raypak will instantly void the ASME and
CSA ratings of the vessel and any Raypak warranty
on the vessel. Altering the ASME or CSA ratings of the
vessel also violates national, state, and local approval
codes.
Installations at Elevation
         
      
       
         




Table B. Basic Data
GAS TRAIN
BLOWER
OPERATING
CENTER
HEAT EXCHANGE
ASSEMBLY
FRONT OF
HEATER
BURNER FLAME
VIEWING PORT
F10210
BURNER
FRONT OF HEATER
IGNITER
FLAME
SENSOR
F10213
GAS SUPPLY
CONNECTION
WATER
OUTLET
COMBUSTION
AIR INLET
HIGH VOLTAGE
ELECTRICAL
CONNECTIONS
WATER INLET
FLUE OUTLET
PRESSURE
RELIEF
VALVE
F10212
Component Locations
Figure 4. Component Locations – Top
Figure 3. Component Locations – Rear
Figure 2. Component Locations – Front
LOW
VOLTAGE
SWITCH
HIGH
VOLTAGE
SWITCH
LOW VOLTAGE
ELECTRICAL
CONNECTIONS
F10211
Figure 1. Component Locations – Side
Model
No.
Input
MBTUH (Kwh) Water
Conn.
(NPT)
Gas
Conn.
(NPT)
Vent Size
in. (mm)
Max. Min. N P Flue Intake
503A       
753A       
1003A       
1253A       
1503A       
1753A       
2003A       



    Figure 5   
       

Clearances
Indoor Installations

      
     
       


  

          

       


          
       

Heater
Side
Min. Clearance
from Combustible
Surfaces**
in. (mm)
Minimum Service
Clearance
in. (mm)
  
  
  
  
  
  
  



            

Table C. Clearances – Indoor Installations
4. INSTALLATION
Installation Codes

       

        

       

       
    

 
      

Equipment Base
        

        
     


ACAUTION: This heater should be located in an area
where water leakage will not result in damage to the area
adjacent to the appliances or to the structure. When such
locations cannot be avoided, it is recommended that
a suitable catch pan, adequately drained, be installed


      

     

31.88"
(81 cm)
0.56" (14 mm)
24.50"
(62 cm)
FRONT OF UNIT F10214
0.75"
(19 mm)
1.125"
(29 mm)
REAR OF UNIT
4 x 0.56" Ø
(14 mm)
Figure 5. Anchor Hole Locations


Outdoor Installations



        

       

     MUST   

            
  MUST      

TOP VIEW
24" (610 mm)
SERVICE
CLEARANCE
REAR EXHAUST INSTALLATION
FRONT VIEW
VERTICAL CLEARANCE
(ALL INSTALLATIONS)
10" (254 mm)
SERVICE
CLEARANCE
F10215
1" (25 mm) *
* Must have 12" (305 mm) service clearance on 1 side.
1' (305 mm) *
Figure 6. Minimum Clearances from Combustible
Surfaces – Indoor and Outdoor Installations
Heater Side
Min. Clearance from
Combustible Surfaces
in. (mm)
Minimum Service
Clearance
in. (mm)
  
  
  
  
  

  
Table D. Clearances – Outdoor Installations


A
V = VENT
X = AIR INLET
F10692
V
G
H
A
B
B
V
V
B
BV
AJ
X
IM
VX
K
V
V
B
F
C
OPERABLE FIXED
CLOSED
FIXED
CLOSED
INSIDE
CORNER DETAIL
OPERABLE
D
L
B
E
V
V
Figure 7. Minimum Clearances from Vent/Air Inlet Terminations – Indoor and Outdoor Installations
Table E. Vent/Air Inlet Termination Clearances
U.S. Installations1Canadian Installations 2

  
  
 
  * *

󰀩


 *
E󰀩 * *
F * *
G  *


*



  *
J







K 
 






  *
1 
2 
t 

* 