Preset Temperature Adjustment - Rheem 862 27 Series Service Instructions Manual

PRESET TEMPERATURE ADJUSTMENT

Factory pre-set and maximum hot water outlet temperature settings for each water heater
series are shown below:
Model
276, 866, 876
244, 274, 374, 864, 101, 874**
372, 862, 872**
**When used as an inline solar booster these models must be set at a minimum outlet temperature of 70ºC.
Voltages up to 240 volts will be present within the water heater, take care
not to touch wiring terminals. Use an insulated tool when adjusting settings.
To check or adjust the preset outlet temperature setting:
1. Remove the front cover from the water heater.
2. Switch dip switches 3 and 4 to the ON (up) position on the DIP1 set of dip switches on
the PCB.
3. The current preset outlet temperature setting will be displayed on the LED1 display at
bottom right hand side of water heater.
4. Press the MIN button to decrease or the MAX button to increase the preset outlet
temperature setting to the desired setting. (The MIN and MAX buttons are located below
the dip switches.)
5. Turn dip switches 3 and 4 to the OFF (down) position on the DIP1 set of dip switches on
the PCB.
6. The LED1 display will go blank. The preset outlet temperature is now set.
7. Refit the front cover to the water heater.
*Outlet Temperature Compensation Adjustment (applicable to 50
The maximum outlet temperature may be adjusted to compensate for temperature losses in
the pipe work between the water heater outlet and sanitary fixtures.
After adjustment the water temperature MUST NOT exceed 50°C from the first tap in the
hot water pipe work after the water heater used for personal hygiene purposes, such as in
a bathroom or ensuite.
If there is a tap, such as a kitchen or laundry tap, in the hot water pipe work between the
water heater and the first tap used for personal hygiene purposes, then it is possible for a
water temperature to be delivered from that tap of up to 2°C higher than the setting shown
on the controller.
It is necessary to have the electrical supply to the water heater switched on during the outlet
temperature compensation adjustment procedure.
NOTE:
 This procedure cannot be conducted with a temperature controller connected to the
water heater. Any temperature controller(s) connected to the water heater must be
disconnected prior to the commencement of this procedure.
 The preset outlet temperature setting of this water heater must be set at 48°C prior
to the commencement of this procedure.
TM049 27L Continuous Flow Service Instructions
REV AL – Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies are deemed "uncontrolled".
Factory setting Maximum Temp
48ºC
60ºC
60ºC
Solar
48ºC*
75ºC
82ºC
o
C models only)
N
Y
Y
14