Technical data

5
Boiler Thermostats
Purewell VariHeat boilers are fitted with
a manual reset limit thermostat, which
has a range of 90-110°C on all models.
This will be factory set to 100°C.
Condensing boilers have an electronic control
temperature range 30-90°C, whereas the
high efficiency non condensing models
have a range from 50-90°C.
The electronic temperature control thermostat
regulates the boiler flow temperature up to
a maximum setting of 90°C.
To accommodate multiple boiler installations,
the limit thermostat is adjustable up to a
maximum of 110°C, however where the
boiler control thermostats are to be set
higher than 83°C, adequate system pressure
must be available either by gravity head
or system pressurisation.
Refer to page 20 for applications and system data.
The boiler also incorporates a return
temperature sensor, which in conjunction
with the flow temperature sensor, governs
the modulation set point of the boiler.
Pipework Kits
Designed to save time and simplify
procurement, optional pipework kits
are available from Hamworthy.
The kits enable multiple boilers to be
connected in configurations of 2, 3
and 4 boilers. The pipework kits are
factory tested and supplied part
assembled for ease of installation.
Pipework kits include:
n Isolating ball valves for water flow, return and gas inlet connection
on each boiler, flow isolation uses a three port vent valve to prevent
fully sealing the boiler when isolated
n Flow and return headers
n Pre assembled flow and return pipe sub assemblies between boilers
and headers. Connections for gauges, sensors, safety relief valve, feed and
vent pipes (gauges, instrumentation and safety relief valves not included)
n Blanking flanges for header ends
n Support legs
Purewell VariHeat-pipework assembly
Non Condensing Outputs @ 82/71°C flow/return temperatures
Boiler Model
Min
output
kW
Heat output according to number of modules installed - kW
1 2 3 4 5 6 7 8
PV 65he 21.5 65 130 195 260 325 390 455 520
PV 85he 30.1 85 170 255 340 425 510 595 680
PV 105he 33.6 105 210 315 420 525 630 735 840
PV 125he 39.8 125 250 375 500 625 750 875 1000
Condensing Outputs @ 50/30°C flow/return temperatures
Boiler Model
Min
output
kW
Heat output according to number of modules installed - kW
1 2 3 4 5 6 7 8
PV 70c 23.3 70 140 210 280 350 420 490 560
PV 95c 31.7 95 180 285 380 475 570 665 760
PV 110c 36.7 110 220 330 440 550 660 770 880
PV 140c 46.7 140 280 420 560 700 840 980 1120
PV 180c 60.0 180 360 540 720 900 1080 1260 1440