Heat Pump User Manual

Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance
˚C kW ˚C kW ˚C kW ˚C kW
-20 37.4111 2 13.0055 24 5.1978 46 2.3276
-19 35.5384 3 12.4391 25 5.0000 47 2.2493
-18 33.7705 4 11.9008 26 4.8109 48 2.1740
-17 31.1009 5 11.3890 27 4.6300 49 2.1017
-16 30.5237 6 10.9023 28 4.4569 50 2.0320
-15 29.0333 7 10.4393 29 4.2912 51 1.9651
-14 27.6246 8 9.9987 30 4.1327 52 1.9007
-13 26.2927 9 9.5794 31 3.9808 53 1.8387
-12 25.0330 10 9.1801 32 3.8354 54 1.7790
-11 23.8412 11 8.7999 33 3.6961 55 1.7216
-10 22.7133 12 8.4377 34 3.5626 56 1.6663
-9 21.6456 13 8.0925 35 3.4346 57 1.6131
-8 20.6345 14 7.7635 36 3.3120 58 1.5618
-7 19.6768 15 7.4498 37 3.1943 59 1.5123
-6 18.7693 16 7.1506 38 3.0815 60 1.4647
-5 17.9092 17 6.8652 39 2.9733 61 1.4188
-4 17.0937 18 6.5928 40 2.8694 62 1.3746
-3 16.3203 19 6.3328 41 2.7697 63 1.3319
-2 15.5866 20 6.0846 42 2.6740 64 1.2908
-1 14.8903 21 5.8475 43 2.5821 65 1.2511
0 14.2293 22 5.6210 44 2.4939 66 1.2128
1 13.6017 23 5.4046 45 2.4091
ATC
38
Fault Finding
13 Fault Finding
5. When tracing a fault code, use the
table of fault codes on page 32 to
help you. As often as not, it will be
a wire that has become loose or
disconnected. Check all wires for
security before calling our helpline
for assistance. There are 6 sensors
in total. The ATC have black tails
and the BTC have blue tails. The
resistance/temperature tables for
the ATC and BTC sensors are given
in Figures 13-2 and 13-3.
6. The pressure gauge on the side of
the heat pump measures refrigerant
pressure not water pressure and is
a useful tool to help fault finding.
If the heat pump goes out on high
pressure, it will almost certainly be
as a result of an air-lock. An air-lock
that cannot be cleared by the pump
will have the same effect as that of
an ordinary boiler. It will overheat as
it cannot get rid of the heat it is
producing. This will be evident if,
when switched on from cold or
warm, the gauge rises quickly
towards the yellow or red zones. If
this happens, switch off, and purge
the system. (Remember to check
the circulating pump is working.)
In normal working conditions, the
pointer on the gauge will remain in
the green zone.
7. Capacitors store an electrical
charge. Small capacitors are found
in all domestic electronics and
cause no danger. However, the
capacitors in a heat pump are
power capacitors and will give a
large electric shock if care is not
taken. DO NOT try to test the
functionality of a capacitor using a
screwdriver or multi-meter and
NEVER try to short out the
connections – even with the mains
voltage removed. Seek the help of a
qualified electrician or a qualified
heating engineer who has been
trained by Grant Engineering.
8. This is a repeat of note 5.
If the heat pump goes out on high
pressure, it will almost certainly be
as a result of an air-lock. An air-lock
that cannot be cleared by the pump
will have the same effect as that of
an ordinary boiler. It will overheat as
it cannot get rid of the heat it is
producing. This will be evident if,
when switched on from cold or
warm, the gauge rises quickly
towards the yellow or red zones. If
this happens, switch off, and purge
the system. (Remember to check
the circulating pump is working.)
Figure 13-2: ATC sensor resistance table