Table of Contents
Advertisement
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] Grundfos cross-over valve (X2)
[11] SS flexible hoses
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
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 - 7 736 504 583
– Only compatible with Bosch 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 - - 7 736 504 584
– 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 6.5.2, page 47.
4.11.3 Recirculation internal pump
12
10
8
6
4
2
0
0
1
2
Fig. 32
Hydraulic curve
Pump performance curve, shown in Fig. 32, is an extra
information for technical installer.
4.12 Space heating applications
CAUTION:
▶ If the set point temperature is above 120°F (49 °C),
precautions should be taken to protect users of potable
water from scalding.
Installation instructions
3
4
5
6
Q [GPM]
6720813635-27.1V
7
8
39
Hide quick links:
Advertisement
Table of Contents
