Worcester 27i System Compact Installation, Commissioning And Servicing Instructions page 8

APPLIANCE INFORMATION
1 Wall mounting frame
2 Expansion vessel
3 CH return isolator
4 Gas inlet isolator
5 CH flow isolator
6 Condensate connection
7 Flue connector
8 Flue overheat thermostat
9 Main superstructure
10 Case
11 Case retaining screws
12 Bottom panel
13 Case retaining clips
14 Control, top panel
15 Menu buttons
16 Blank for optional programmer
17 Diagnostic port (for Worcester service engineers)
18 Pressure gauge
19 DHW temperature control*
20 Boiler identification label
21 Operation/fault diagnostic light (blue)
22 Control panel flap
23 Boiler fascia guide location
24 CH temperature control
25 Boiler display
Table 4 Boiler components
* DHW temperature control.
The optional Integral Diverter Valve kit with cylinder sensor is required to enable the hot water temperature control to be used.
The table below lists:
▶ the accessories that can be fitted when the integral diverter valve is fitted.
▶ with which accessory the DHW control is operational
Accessory
DT10RF Digital programmable room thermostat
DT10RF Optimiser Digital programmable room thermostat
DT20 Twin channel digital programmer
DT20RF Digital RF thermostat with twin channel programmer
FR110 Programmable room thermostat
FW100 weather compensation controller
The FR110 and FW100 assume control over the DHW set point temperature control, making the manual DHW temperature control
inoperative.
Worcester fascia mounted mechanical timers cannot be used with this appliance.
8
26 Fan
27 Flow temperature sensor (NTC)
28 Electrode assembly
29 Maximum safety sensor NTC
30 Auto air vent
31 Aluminium Silicon Heat exchanger
32 Flueway
33 Sump assembly
34 Pressure gauge connection point
35 Diverter valve actuator blank
36 Diverter valve body
37 Modulating pump
38 Drain point
39 CH return connection to service valve
40 PRV
41 Gas connection to service valve
42 CH flow connection to service valve
43 Condensate discharge pipe
44 Siphon
45 Expansion vessel connection point
46 Return temperature sensor (NTC)
47 Gas valve
48 Combustion air inlet
49 Ignition transformer
DHW control operational
Integral diverter valve External diverter valve
YES
YES
YES
YES
NO
NO
N/A
N/A
N/A
N/A
N/A
N/A
Greenstar i System Compact - 6 720 807 726 (2013/05)