Hoval STU Series, Installation, Operation And Maintenance Instructions, Page: 8 / 54

8
Hoval STU Wood Pellet Boiler
Dimensions and Technical Information
Key:
1
Flow
2 Returns - One either side, both to
be connected to a common inlet header
3 Safety valve connection
4 Drain connections (plugged)
5 Stat pockets
6 Pressure switch connection
7 Smoke box condensate drain
8 Delivery auger
9 Damper assembly
10
ID fan
11 FD fan
12 Transfer box
13 Temperature gauge
14
Sight glass assembly
15 Oxygen sensor
16 Smokebox cleaning door
17 Burn back thermostat
18 Burn back water dump device
19 Temp sensor for water dump device
20 Electric ignition gun (optional)
21 Thermal Safety Overload
22 Combustion Chamber pressure switch
STU Boiler 150 200 250 300 350 425 500 600
Dimensions:
A (mm) 2441 2428 2523 2523 3038 3078 3078 3539
B (mm) 1657 1644 1644 1644 2159 2159 2159 2619
C (mm) 900 1180 1180 1180 1180 1180 1180 1180
D (mm) 1740 1940 1940 1940 1940 1940 1940 2210
E (mm) 1499 1485 1485 1485 2000 2000 2000 2460
F (mm) 572 755 755 755 755 755 755 730
G (mm) 680 908 908 908 908 908 908 855
H (mm) 640 840 840 840 840 840 840 840
J (mm) 285 285 285 285 285 285 285 285
K (mm) 240 235 235 235 235 235 235 275
Connections:
1 Flow (PN6) DN50 DN80 DN80 DN80 DN80 DN80 DN80 DN100
2 Return (PN6) 2xDN50 2xDN80 2xDN80 2xDN80 2xDN80 2xDN80 2xDN80 2xDN100
3 Safety valve (BSP) G1.1/2 ײ G2 ײ G2 ײ G2 ײ G2 ײ G2 ײ G2 ײ G2 ײ
4 Drain (BSP) 2xG1.1/2 2xG1.1/2 2xG1.1/2 2xG1.1/2 2xG1.1/2 2xG1.1/2 2xG1.1/2 2xG1.1/2
5 Stat pockets (BSP) G1/2" G1/2" G1/2" G1/2" G1/2" G1/2" G1/2" G1/2
ײ
6 Pressure switch (BSP) R3/4" R3/4" R3/4" R3/4" R3/4" R3/4" R3/4
ײ
R3/4
ײ
7 Smoke box drain (mm) G3/4" G3/4" G3/4" G3/4" G3/4" G3/4" G3/4" G3/4 ײ
8 Delivery auger (mm) 100 100 100 100 100 125 125 125
9 Damper assembly (mm) 150 150 200 200 200 200 255 255
10 ID inlet fan (mm) 150 150 200 200 200 200 255 255
Halifax fan No 9 9 12 12 12 12 15 15
ID fan outlet (mm) 146x127 146x127 172x191 172x191 172x191 172x191 216x241 216x241
A 3ph+N 32A 400V supply is required
for the control panel operation.
Notes:
• Thermal safety heat exchanger connections c/w thermostatic control valve
connection (3/4") to be connected to a cold water mains supply. Drain pipework
(by others) to be run via tundish to drain. See Appendix B for further details.
• Boiler mounted control panel not shown, but typical sizes are:
Models 150 to 425: 600mm W x 800mm H x 260mm D
Models 500 and 600: 800mm W x 1200mm H x 300mm D
This may change and should be checked for each project.