Supplementary Information - Mitsubishi Electric EHGT17D-YM9ED Service Manual

Notes on replacing the parts
Replacement of the parts listed below requires the following procedure.
After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specified tighten-
ing torques below. For details about recommended loctite and loctite remover, refer to Table 10-1, and for details about the replacement parts and their tightening
torques, refer to Table 10-2.
Table 10-1
Recommended Manufacturer
Loctite Henkel
Loctite remover Henkel
Note: When using the products above, refer to the appropriate manuals that come with the individual products.
Table 10-2
Part name *1
PRESSURE RELIEF VALVE 3 bar
PRESSURE RELIEF VALVE 10 bar
*1. For more details about the listed parts refer to the parts catalog.
*2. Undertightening and overtightening the parts affect water seal life.
Tighten the parts to the appropriate tightening torques.
When installing the parts that are not listed above, observe the tightening
torques in accordance with Table 10-3.
Always use a new O-ring or gasket.
11

SUPPLEMENTARY INFORMATION

Back-up operation of boiler
Heating operation is backed up by boiler.
For more details, refer to the installation manual of PAC-TH012HT-E.
<Installation & System set up>
1. Set DIP-SW 1-1 (FTC) to ON "With boiler" and SW2-6 (FTC) to ON "With Mixing tank".
2. Install the thermistors THWB1
3. Connect the output wire (OUT10: Boiler operation) to the input (room thermostat input) on the boiler.
4. Install one of the following room temperature thermostats.
Wireless remote controller (option)
Room temp. thermostat (local supply)
Main remote controller (remote position)
*1 The boiler temperature thermistor is an optional part.
*2 OUT10 has no voltage across it.
*3 Boiler heating is controlled on/off by the Room temp. thermostat.
<Main remote controller settings>
1. Go to Service menu > Heat source setting and choose "Boiler" or "Hybrid".
2. Go to Service menu > Operation settings > Boiler settings to make detailed settings for "Hybrid" above .
*4 The "Hybrid" automatically switches heat sources between Heat pump (and Electric heater) and boiler.
Product fiche of temperature control
(a) Supplier's name: MITSUBISHI ELECTRIC CORPORATION
(b) Supplier's model identifier: PAR-WT50R-E and PAR-WR51R-E
(c) The class of the temperature control:
(d) The contribution of the temperature control to seasonal space heating energy efficiency: 4%
OCH722A
No. Applied parts
Loctite 5400 PRESSURE RELIEF VALVE (3bar
and 10bar)
Loctite 5776 TEMPERATURE AND PRESSURE
RELIEF VALVE
Loctite 7200 PRESSURE RELIEF VALVE (3bar
Gasket Remover and 10bar) and TEMPERATURE
AND PRESSURE RELIEF VALVE
Recommended tightening
torque [Nm] *2
35 ± 2
40 ± 2
*1
on the boiler circuit.
93
Note
Apply loctite all over from the end of external thread to the
second ridge. After installing the parts, fix the parts for at least
30 minutes
Spray loctite remover over sealant on the threads, let the seal-
ant sit until soft, and then eliminate it with a wire brush.
Table 10-3
Size [inch]
Gasket G1/4"
G3/8"
G3/4"
G1"
G1 3/4"
Packing Strainer cover
O-ring Flow sensor
Air vent (Automatic)
Flow switch(Brine circuit)
Drain cock (primary / brine circuit)
Attached packing
Air vent (manual)
Flare joint (for water circuit parts)
After the procedure is complete, ensure that no water leaks.
*3
*4
Recommended tightening
torque [Nm]
8 ± 1
35 ± 2
42 ± 2
42 ± 2
10 ± 1
40 ± 2
0.6 ± 0.2
35 ± 1
8 ± 1
0.25 ± 0.05
0.25 ± 0.05
35 ± 2
*2