Installation / Operation Instruction Manual

40
Installation instructions
RTG-L-199/160N/X1 – 6 721 827 274 (2022/06)
• Cross Over Mode
Cross over mode requires two (2) Grundfos thermal by-pass
valves or one (1) AquaMotion AMK-ODR valve.
Fig. 31 Recirculation application
[1] Cold inlet supply
[2] Check valve field supplied
[3] Expansion tank field supplied
[4] Shutoff valves field supplied
[5] Cold water inlet
[6] Gas supply
[7] Shutoff gas valve
[8] Hot water outlet
[9] Pressure relief valve
[10] SS flexible hoses
[11] Grundfos cross-over valve (X2)
[12] AquaMotion AMK-ODR valve
Tank loading
This recirculation option gives the option of using one of three
temperature sensors to control the recirculation option. The
scheduling option is not available for tank loading.
• External NTC - 7 736 505 665
– Only compatible with BW cable/sensor accessory
(7736504583). Sensor must be inserted into the tank
pocket and plug in at the tank connector in bottom of
the appliance.
• Aquastat - 7 736 505 666
– Compatible with thermostat type solution (example
Aquastat). Thermostat/Aquastat must be connected to
the appliance using the tank connector in bottom of the
appliance.
• Internal NTC
– Allows tank loading without using any external sensor/
cable. Temperature readings will be made at the
appliance.
For more information how to program each menu, see
chapter 6.5.4, page 50.
The RTGL unit’s built in pump is design to work optimally with
applications that require modest flow rates and head
pressures, like residential recirculation.
4.11.3 Recirculation internal pump
Fig. 32 Hydraulic curve
Pump performance curve, shown in Fig. 32, is extra
information for technical installer.
0123 87654
0
2
4
6
8
10
12
H [ft]
Q [GPM]
6720813635-27.1V