Rheem 64DV - Page 58

S V C 8 2 0 ( P ) P o c k e t M a n u a l P a g e 57
57
Calculate Temperature Rise & Gallons per Minute:
1. Enter maintenance mode & select table 3Y. Turn on
water flow to determine inlet water temperature.
2. Using the formula below, determine temperature rise.
Remote control temp - Incoming water temp = Temperature Rise
3. Select table 1Y. Using the incoming water shut off valve
Turn OFF incoming water at the unit. Turn ON ALL hot
water fixtures in the home/business to full flow. Using the
incoming water shut-off valve, turn ON incoming water at
unit. Determine MAX GPM flowing through unit.
*BEFORE continuing - Refer to pages 12 & 13 to obtain
MAX GPM possible for appropriate model number.
Maintenance Mode
Instructions on Page 21
With ALL hot water fixtures
turned ON full flow, will the
unit EXCEED MAX GPM it
can produce?
YES
Remove & reinsert C.
Operate unit again.
IF Code 29 appears:
Replace control board.
NO
Turn water & remote control
OFF. Turn remote control
ON. Open ALL hot water
fixtures. Measure DC Volts
across Black & White wires
on connector C:
8 – 16 DC Volts
YES
NO
Measure DC Volts across
black & red wires on
connector C:
8 – 16 DC Volts
YES
NO
Replace water volume
control valve.
Remove & reinsert C.
Operate unit again.
IF Code 29 appears:
Replace control board.
Remove & reinsert C.
Operate unit again.
IF Code 29 appears:
Replace control board.