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5.1.2 Connecting the Domestic Hot Water (DHW) thermistor T1
Direct cylinder with plate heat exchanger
[Fig 5.1.2.1]
The thermistor can be attached to different parts of the system depending on the set up and the availability of connection points.
Note
1
: Thermistor (T1) attached to terminals 1 & 2 on ACH1 unit [Fig 5.1].
Note
2
: If the water heated from the HPB at 45°C is in a separate tank to the immersion heater taking the water temperature up to 60°C, the 45°C
water must be kept circulating to maintain legionella control.
•
Type (a) – T1 attached to cylinder
o
Set temperature to no more than 45°C (0101).
o
Immersion function available – set temperature to 45°C (0000 – all OFF).
o
When 44°C is achieved on T1, the immersion signal comes on and heats to 60°C. For more information see Unit Logic
[section 6]*
.
•
Type (b) - T1 attached to inlet to the plate heat exchanger (cylinder water outlet)
o
Set temperature to no more than 45°C (0101).
o
No immersion heater function available.
Indirect Cylinder
[Fig 5.1.2.2]
The thermistor can be attached to different parts of the system depending on the set up and the availability of connection points.
Note: Thermistor (T1) attached to terminals 1 & 2 on ACH1 unit [Fig 5.1].
•
Type (a) – T1 attached to cylinder
o
Set temperature to no more than 45°C (0101).
o
Immersion function available – set temperature to 45°C (0000 – all OFF).
o
*See as above.
•
Type (b) - T1 attached to inlet to cylinder pipe (PQFY water outlet)
o
Set temperature to 53°C (1101) on ACH1.
In order to increase the output temperature of the water it is necessary to increase the condensing temperature of the
Heat Pump. This is achieved by setting a Dip Switch as follows.
•
PUMY-P100/125/140YMH, PUMY-P100/125/140VMH, SW 6-6 to the ON position.
•
All City Multi P200 and above, SW3-7 to the ON position.
o
ONLY USE WHEN TANK SURFACE IS INACCESSABLE
.
o
No immersion heater function available.
5.3.3 Connecting the Under Floor Heating (UFH) thermistor T2
[Fig 5.1.3]
Note: thermistor (T2) attached to terminals 3 and 4 on ACH1 unit [Fig 5.1].
•
T2 attached to water inlet to PQFY (return from under floor system)
o
Set temperature to desired return temperature from under floor system.
o
i.e. 35°C (0101) return temperature would typically mean an outlet temperature to under floor system of 45°C, giving at temperature
difference of 10°C.
5.3.4 Connecting the Under Floor Cooling (UFC) thermistor T3
[Fig 5.1.4]
Note: thermistor (T3) attached to terminals 5 and 6 on ACH1 unit [Fig 5.1].
•
T3 attached to water outlet from PQFY (outlet to under floor system)
o
Set temperature to desired outlet temperature from under floor system, typically minimum allowable to avoid condensation on the
floor surface.
o
i.e. no less than 18°C (1000) for laminate flooring.
