Mitsubishi Electric PAC-IF021B-E Manual page 17

3
Electrical work (FTC2)
3.4. Connecting thermistor cable
Connect the thermistor 2 for the FTC2 controller.
3.4.1. Connecting the actual fl ow water temp. thermistor (TH1)
Connect the thermistor for the actual fl ow water temp. to 1 and 2 on
the terminal block (TB61) on the FTC2 controller.
When the thermistor cables are too long, cut them at the
appropriate length.
Do not bind them in the FTC2 unit.
<Thermistor position>
Put TH1 on water piping (water outlet side) after booster heater.
Note: Be sure to attach the TH1 where it detects Flow
temp.(Water oulet side) correctly.
3.4.2. Connecting the pipe temp. thermistor (TH2)
Connect the thermistor for the refrigerant pipe temp. to 3 and 4 on
the terminal block (TB61) on the FTC2 controller.
For packaged Outdoor unit : It is NOT necessary to connect TH2.
For split Outdoor unit : Connect TH2.
When the thermistor cables supplied with FTC2 are too long, cut
them to the appropriate length.
Do not bind them in the FTC2 unit.
<Thermistor position>
Put the TH2 on refrigerant piping (Liquid side).
It is better to protect the thermistor with heat insulating materials not to be affected by the ambient temperature.
Note: Be sure to attach the TH2 where it detects Refrigerant piping temp. (Liquid side) correctly.
3.4.3. Connecting the actual DHW tank thermistor (TH5)
Connect the thermistor for the actual DHW tank temp. to 5 and 6 on the terminal block (TB61) on the FTC2 controller.
When the thermistor cables supplied with the FTC2 are too long, cut them to the appropriate length.
Do not bind them in the FTC2 unit.
<Thermistor position>
Put the TH5 on the DHW tank. It should be positioned directly onto the lower half of the external surface of the tank.
Caution:
Do not route the thermistor cables together with power cables.
The sensor part of the thermistor should be installed where user must not touch.
(It is separated by the supplementary insulation from where user may touch.)
3.4.4. Thermistor position and necessity
For packaged type Outdoor unit: It is NOT necessary to connect TH2.
For split type Outdoor unit: Connect TH2
<Thermistor position and necessity>
Outdoor Type DHW tank
Present
PACKAGED type
Absent
Present
SPLIT type
Absent
Ο: Necessary. Connect the thermistor. Х: Not necessary. The thermistor is not required, do not connect.
SPLIT type outdoor unit with DHW tank
Refrigerant LIQUID side
FTC2
Outdoor unit
TH2
*1
Refrigerant piping
SPLIT type
(without a refrigerant-water HEX inside)
SPLIT type outdoor unit without DHW tank
Refrigerant LIQUID side
FTC2
Outdoor unit
TH2
*1
Refrigerant piping
SPLIT type
(without a refrigerant-water HEX inside)
TH1 TH2
Ο Х
Ο Х
O O
Ο Ο
DHW tank
temperature
TH5
Water OUTLET
side
TH1
Booster heater
Water piping
*1 Refrigerant-water HEX
Water OUTLET
side
TH1
Booster heater
TH5:
not necessary
TH5
Water piping
*1 Refrigerant-water HEX
TB61
TH1
TH2
TH5
TB62
Wired remote controller cable
TH5
Ο
Х
O
Х
PACKAGED type outdoor unit with DHW tank
Water OUTLET side
after Booster heater
Outdoor unit
Booster heater
*1
Water piping
PACKAGED type
(with a refrigerant-water HEX inside)
PACKAGED type outdoor unit without DHW tank
Water OUTLET side
after Booster heater
Outdoor unit
Booster heater
*1
Water piping
PACKAGED type
(with a refrigerant-water HEX inside)
Flow temp. controller
Photo.3-3
DHW tank
temperature
TH5
FTC2
TH1
TH2:
not necessary
TH2
*1 Refrigerant-water HEX
FTC2
TH1
TH2: TH5:
not necessary not necessary
TH2 TH5
*1 Refrigerant-water HEX
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