Mitsubishi Electric PAC-IF031B-E Installation Manual page 10

4. Electrical work
4.4. Connecting thermistor cable
Connect the thermistor 2 for the FTC2 controller.
4.4.1. 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.
4.4.2. 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.
4.4.3. 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.)
4.4.4. 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
Outdoor unit
TH2
Refrigerant piping
SPLIT type
(without a refrigerant-water HEX inside)
SPLIT type outdoor unit without DHW tank
Refrigerant LIQUID side
Outdoor unit
TH2
Refrigerant piping
SPLIT type
(without a refrigerant-water HEX inside)
10
RG79D525H01_EN.indd 10 RG79D525H01_EN.indd 10
TH1 TH2 TH5
Ο Х Ο
Ο Х Х
O O O
Ο Ο Х
DHW tank
temperature
TH5
Water OUTLET
FTC2
side
TH1
Booster heater
*1
Water piping
*1 Refrigerant-water HEX
Water OUTLET
side
FTC2
TH1
Booster heater
TH5:
not necessary
*1
TH5
Water piping
*1 Refrigerant-water HEX
TB61
TH1
TH2
TH5
Photo.4-3
TB62
Wired remote controller cable
PACKAGED type outdoor unit with DHW tank
Water OUTLET side
after Booster heater
TH1
Outdoor unit
Booster heater
TH2:
not necessary
*1
Water piping
PACKAGED type
(with a refrigerant-water HEX inside)
*1 Refrigerant-water HEX
PACKAGED type outdoor unit without DHW tank
Water OUTLET side
after Booster heater
TH1
Outdoor unit
Booster heater
TH2:
not necessary
*1
Water piping
PACKAGED type
(with a refrigerant-water HEX inside) *1 Refrigerant-water HEX
DHW tank
temperature
TH5
FTC2
TH2
FTC2
TH5:
not necessary
TH2 TH5
2009/04/10 9:24:35 2009/04/10 9:24:35