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10.4. Thermal insulation of refrigerant
piping
Add insulation to refrigerant piping by covering high-pressure/liquid pipe and
low-pressure/gas pipe separately with enough heat resistant polyethylene, so
that there isn't a gap insulation in the joint between indoor unit and insulation,
and itself. When insulation is insufficient, there is a possibility of condensation,
etc. Pay special attention to insulation in the ceiling plenum.
[Fig. 10.4.1] (P.10)
A Steel wire
C Asphaltic oily mastic or asphalt
E Outer covering B
Heat
Glass fiber + Steel wire
insulation
Adhesive + Heat - resistant polyethylene foam + Adhesive tape
material A
Indoor
Vinyl tape
Outer
Floor exposed
Water-proof hemp cloth + Bronze asphalt
covering B
Heat source
Water-proof hemp cloth + Zinc plate + Oily paint
Note:
•
When using polyethylene as the insulation, asphalt shall not be
required.
•
Do not insulate the electric wires.
[Fig. 10.4.] (P.10)
A High-pressure/liquid pipe
D Finishing tape
[Fig. 10.4.] (P.10)
Penetrations
[Fig. 10.4.4] (P.10)
<A> Inside wall (concealed)
<C> Outside wall (exposed)
<E> Roof pipe shaft
<F> Access hole on fire and boundary walls
Sleeve
A
Lagging
C
Band
E
Sleeve with edge
G
Mortar or other incombustible caulking
I
Explosion-resistant insulation
J
When filling a gap with mortar, cover the access hole part with steel plate so that
the insulation will not caved in. Use incombustible materials for both insulation
and covering. (Vinyl covering should not be used.)
11. Wiring (For details, refer to the installation manual of each unit and controller.)
11.1. Caution
1 Follow ordinance of your governmental organization for technical standard
related to electrical equipment, wiring regulations and guidance of each
electric power company.
2 Control wiring (hereinafter referred to as transmission line) shall be 5 cm [2in]
or more apart from power source wiring so that it is not affected by electric
noise from power source wiring (Do not insert transmission line and power
source wire in the same conduit).
3 Provide designated grounding work to the heat source unit.
4 Include some allowance to wiring for the electrical control box on the indoor
and heat source units, because these boxes are sometimes removed at the
time of service work.
5 Never connect the main power source to the terminal block of the
transmission line. If connected, electrical parts will be damaged.
6 Use 2-core shield cable for the transmission line. If transmission lines of
different systems are wired with the same multiplecore cable, the resultant
poor transmitting and receiving will cause erroneous operations.
7 Only the transmission line specified should be connected to the terminal
block for heat source unit transmission.
The system will not operate with improper connection.
8 In the case of connecting a system controller or to conducting group
operation in different refrigerant systems, a transmission line is required
between the heat source units in different refrigerant systems.
Connect the transmission between the terminal blocks for centralized control
(two-wire line with no polarity).
9 Use the remote controller to set the groups.
6
B Piping
D Insulation material A
B Low-pressure/gas pipe
C Electric wire
E Insulation
<B> Outside wall
<D> Floor (waterproofing)
Insulation
B
Caulking material
D
Waterproofing layer
F
Lagging material
H
•
Insulation for the pipes to be added on site must meet the following
specifications:
Heat source unit
High-pressure pipe
-BC controller
for PQRY-P·Z(S)KMU-A
Low-pressure pipe
BC controller
Pipe size 6.35 mm to 25.4 mm [1/4'' to 1'']
-indoor unit
for PQRY-P·Z(S)KMU-A
Pipe size 28.58 mm to 38.1 mm [1-1/8'' to 1-21/32''] 15 mm [19/32''] or more
Heat source unit
Pipe size 6.35 mm to 25.4 mm [1/4'' to 1'']
-indoor unit
for PQHY-P·Z(S)KMU-A
Pipe size 28.58 mm to 38.1 mm [1-1/8'' to 1-21/32''] 15 mm [19/32''] or more
Temperature Resistance 100°C [212°F] min.
*
If pipes are located in a high-temperature high-humidity environment, such
as the top floor of a building, insulation thicker than the ones specified in the
chart above.
*
When the client presents certain specifications, ensure that those also meet
the specifications on the chart above.
10.. Installing the water stopper
Make sure to install the supplied water stopper and sealing material when
providing insulation.
*
When using PQRY-P series, install them to only the low-pressure pipe.
*
When using PQHY-P series, install them to both liquid pipe and gas pipe.
Use the water stoppers and sealing material that fit each pipe.
[Fig. 10.] (P.11)
A Position the edge of the supplied paper with mark at the edge of the pipe
cover. Then, wind the sealing material to the pipe, using the mark on the
paper to properly align it.
B Extend the field-supplied insulation all the way to the end of the sealing
material described in step A.
C Install the water stopper at the end face of the insulation.
D Mark
E Install the sealing material so that the edges of the material meet at the top.
F Inside the unit
G Pipe cover
H The seam of the insulation should be at the top.
I Sealing material for water stopper
J Install the water stopper so that the slit of the water stopper is at the top.
K Water stopper
L Sealing material for field piping
11.. Control box and connecting position
of wiring
1 Heat source unit
1. Remove the front panel of the heat source unit by unscrewing the screws,
and pushing it up, then pulling it out.
2. Connect the indoor - heat source transmission line to the terminal block
(TB3).
If multiple heat source units are connected in the same refrigerant system,
daisy-chain TB3 (M1, M2,
Terminal) on the heat source units. Connect
the indoor - heat source transmission line to TB3 (M1, M2,
only one of the heat source units.
3. Connect the transmission lines for centralized control (between the
centralized control system and the heat source unit of different refrigerant
systems) to the terminal block for centralized control (TB7). If the multiple
heat source units are connected to the same refrigerant system, daisy-chain
TB7 (M1, M2, S Terminal) on the heat source units. (*1)
*1: If TB7 on the heat source unit in the same refrigerant system is not
daisy-chained, connect the transmission line for centralized control to
TB7 on the OC (*2). If the OC is out of order, or if the centralized control
is being conducted during the power supply shut-off, daisy-chain TB7
on the OC, OS1, and OS2 (In the case that the heat source unit whose
power supply connector CN41 on the control board has been replaced
with CN40 is out of order or the power is shut-off, centralized control will
not be conducted even when TB7 is daisy-chained).
*2: OC, OS1, and OS2 of the heat source units in the same refrigerant
system are automatically identified. They are identified as OC, OS1, and
OS2 in descending order of capacity (If the capacity is the same, they
will be in ascending order of their address number).
10 mm [13/32''] or more
20 mm [13/16''] or more
10 mm [13/32''] or more
10 mm [13/32''] or more
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