Fig. 20 Check valve
4.9.10 Option H2, H12
Auxiliary heating
The auxiliary heating has the following functions:
■ Prevents condensation forming on the machine in climates of high humidity.
■ Pre-warms the machine when ambient temperatures are below 23°F.
The auxiliary heating is designed to raise the machine temperature to about 50°F.
The thermostat switching point is factory set to 41°F.
Fig. 21 Auxiliary heating
1
Radiator
2
Thermostat
3
Terminal box
4.9.11 Option H3, H12
Outdoor installation
Air inlet and outlet openings must be provided with weather protection when the machine is instal‐
led outdoors. The joints at the sound enclosure (Option H12) are sealed with silicone.
4.9.12 Option H11
Piped inlet
Air is drawn into the block through the inlet silencer.
4
Design and Function
4.9
Options
34
Installation and Operating Manual Rotary lobe blower
HBPI pr
Number: 9_9572 28 USE