Setting The Btc Controller - Grant Aerona HPAW65 Installation & User's Instructions

11.6 Setting the BTC Controller

To set the BTC controller parameters:
1. Remove outer cover.
2. Remove screw and inner cover.
3. Set the lower DIP switch (1) to ON
(move it to the left). Refer to Figure
11-5.
4. Replace both inner and outer
covers.
5. Press all 3 buttons for 1 second to
enter the 'ADJUST' display mode.
Refer to Figure 11-4.
6. OUTDR START setting should be
displayed. If so, go to step 9 below.
7. If MODE is displayed, press either
the or buttons until 'MODE 3'
is displayed.
8. Then, press 'Item' button – OUTDR
START setting will be displayed.
9. To adjust the OUTDR START setting
– use the or buttons.
10. Press 'Item' button to move on to
next parameter – adjust as
necessary.
11. Repeat this process to check and
adjust all settings, as necessary.
!
NOTE
If no buttons are pressed for a
period of 20 seconds the BTC will
automatically return to the 'VIEW'
display.
IMPORTANT
In order for the BTC and Heat
Pump to function correctly the
BTC parameters must be set as
shown in the table above.
BTC Parameters
Note: The actual parameter displayed on the BTC ADJUST view will depend on the
version of the BTC control fitted to the Heat Pump, as follows:
BTC Version 1 BTC Version 2
OUTDR START OUTDR START
OUTDR DSGN OUTDR DSGN
BOIL START BOIL START
BOIL DSGN BOIL DSGN
BOIL MAX BOIL TARGET MAX
BOIL MIN (not displayed)
MASS (not displayed)
DIFF DIFF
(not displayed) MIN ON
(not displayed) MIN OFF
BOIL TARGET DHW TARGET TANK
MODE DHW (not displayed)
DLY (Pump) DLY (Pump)
WWSD WWSD
°C/°F °C/°F
Notes:
a) Depending on the version of the
control fitted to the heat pump,
some parameters may be displayed
with the prefix 'BOIL' – e.g. BOIL
START, BOIL DSGN, etc. In this
application of the control this is
referring to the heat pump (and not
any external boiler).
b) The OUTDR Start, OUTDR DSGN
and START settings shown above
are suitable for a system design of -
3°C to 21°C. If any other design
criteria are used, alter these settings
to match the design criteria.
c) The BOIL DSGN (or DSGN)
parameter can be adjusted to suite
the heating system eg. 50˚C for a
radiator system.
d) Depending on the version of the
control fitted to the heat pump, the
MASS parameter may not be displayed
on the control. In this case it will be
automatically set to a value of 2. If it
is displayed, manually set it to 2.
e) Depending on the version of the
control fitted to the heat pump, the
DIFF parameter may not be displayed
Take a note of these settings and write them in the table on page 34.
IMPORTANT - Only set parameters as shown above unless
instructed otherwise by Grant UK
BTC Version 3 Setting
OUTDR START 21°C
OUTDR DSGN -3°C
START 30°C
DSGN 40°C
TARGET MAX 55°C
(not displayed) OFF
(not displayed) 2
DIFF 10°C
MIN ON 3 mins
MIN OFF 3 mins
DHW TARGET 46°C
(not displayed) 1
DLY (Pump) 8 mins
WWSD 24°C
(not displayed) °C
on the control. In this case it will be
automatically set to 10°C. If it is
displayed, manually set it to 10°C.
f) Depending on the version of the
control fitted to the heat pump, Min
ON and Min OFF parameters may
not be displayed. In this case the
values will be automatically set to 3
mins. If they are displayed these
parameters must be set to 3 mins –
resulting in a maximum of 10 on/off
cycles per hour.
g) DHW TARGET setting of 46°C
assumes the cylinder thermostat
setting of 45°C and thereafter,
heated by an auxiliary source – e.g.
immersion element, boiler etc. refer
to Section 9.3.
h) Pump Delay should be set to 8
minutes. Pump delay should be set
to 2 minutes for bivalent system
(Refer to Section 4.3 and 4.4).
i) WWSD should always be set 3°C
higher that the OUTDR Start setting.
Note: WWSD does not operate
when there is a hot water demand.
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