A.O. Smith Upsilon Installation And Service Manual page 5

T1
T1a
P1
T2
15
G C A
description components
1 heat exchanger 1 (All UB-types)
2 heat exchanger 2 (UB 110 and UB 140)
3 ignition unit
4 fan unit
5 damper
6 gas valve
7 automatic air vent
8 main switch 230V
9 boiler contol unit
10 control unit MMI
11 connection terminal
12 connection terminal cascade bus communication
13 syphon
14 circulation pump
15 gas isolation valve (in optional boiler connections set)
4
6
3
5
1
4
6
3
5
2
9
10
11
18
17
16
R
20 19
8
12
16 service valves flow/return (in optional boiler connections set)
17 fill and drain valve (in optional boiler connections set)
18 safety valve (in optional boiler connections set)
19 flue connection
20 air supply
21 collective flue pipe
22 information plate
T1 flow sensor
T1a secondary flow sensor (only HEX4)
T2 return sensor
P1 water pressure sensor
G gas pipe
A flow pipe CH
R return pipe CH
C condensate drain pipe
7
21
7
14
22
13
figure 1.a
5