Installation Manual

52 Rinnai Tankless Rack System (TRS) Installation Manual
Refer to the Parameter Seng secon of the “Rinnai Tankless Water Heater Installaon and Operaon Manual” for
instrucons on accessing and changing parameter sengs.
SETTING
#
SETTING
DESCRIPTION
SELECTION
A c
04
Recirculaon
Sengs
No
Recirculaon
Recirculaon
Dedicated Mode
Crossover Mode
Long Loop Short Loop
05
Recirculaon
Modes
Economy Comfort
04 Recirculaon Sengs
Crossover Mode (Long Loop): Adjust parameter seng to 04C for loop length of 201  (60 m) to 400  (122 m)
with 3/4 in. pipe or for 51  (15 m) to 100  (30 m) with 1/2 in. pipe.
Crossover Mode (Short Loop): Adjust parameter seng to 04d for loop length of less than 200  (60 m) with 3/4
in. pipe or for less than 50  (15 m) with 1/2 in. pipe.
*Take equivalent
elbow lengths into
consideraon when
calculang pipe length.
Maximum Pipe Length*
Pipe Diameter 3/4 in. 1/2 in.
Short Loop
～200  (60 m) ～50  (15 m)
Long Loop 201  (60 m)～400  (122 m) 51  (15 m)～100  (30 m)
05 Recirculaon Modes
Economy (Factory Default): Adjust parameter seng to 05A for Economy mode. This mode cycles the pump less
oen, using less energy to maintain the circulaon loop temperature.
Comfort: Adjust parameter seng to 05 for Comfort mode. This mode cycles the pump more frequently,
ensuring the loop temperature remains higher (but also uses more energy).
Parameter Sengs (Crossover Mode)
Configure TRW02ST and TRW03ST Racks for Crossover Mode (Thermal Bypass Valve) (Continued)