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10.4. Thermal insulation of refrigerant
piping
Add insulation to refrigerant piping by covering high-pressure pipe and low-
pressure 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 insuf¿ cient, there is a possibility of condensation, etc. Pay
special attention to insulation in the ceiling plenum.
[Fig. 10.4.1] (P.9)
A Steel wire
C Asphaltic oily mastic or asphalt
E Outer covering B
Heat
Glass ¿ ber + 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. 10.4.2] (P.9)
A High-pressure pipe
B Low-pressure pipe C Electric wire
D Finishing tape
E Insulation
[Fig. 10.4.3] (P.9)
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
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 burn out.
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 speci¿ ed should be connected to the terminal
block for.
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.
11.2. Control box and connecting position
of wiring
1 Heat source unit
1. Remove the front panel of the control box by unscrewing the 4 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.
24
B Piping
D Insulation material A
Terminal) of
Penetrations
[Fig. 10.4.4] (P.9)
<A> Inside wall (concealed)
<C> Outside wall (exposed)
<E> Roof pipe shaft
<F> Access hole on ¿ re and boundary walls
A
Sleeve
C
Lagging
E
Band
G
Sleeve with edge
I
Mortar or other incombustible caulking
J
Explosion-resistant insulation
When ¿ lling 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.)
•
Insulation for the pipes to be added on site must meet the following
speci¿ cations:
Heat source unit
High-pressure pipe
-BC controller
for PQRY-P·T(S)HMU-A/Y(S)HMU-A
Low-pressure pipe
BC controller
Pipe size 6.35 mm to 25.4 mm [1/4'' to 1'']
-indoor unit
for PQRY-P·T(S)HMU-A/Y(S)HMU-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 PQRY-P·T(S)HMU-A/Y(S)HMU-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 À oor of a building, insulation thicker than the ones speci¿ ed in the
chart above.
*
When the client presents certain speci¿ cations, ensure that those also meet
the speci¿ cations on the chart above.
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 and OS (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 and OS of the heat source units in the same refrigerant system are
automatically identi¿ ed. They are identi¿ ed as OC and OS in descending
order of capacity (If the capacity is the same, they will be in ascending
order of their address number).
4. The indoor-heat source transmission line, connect the shield ground to the
grounding terminal (
). For the centralized transmission lines, connect to
the shield terminal (S) on the terminal block (TB7). If the heat source units
whose power supply connector CN41 is replaced with CN40, short circuit the
shield terminal (S) and the ground terminal (
5. Attach the connected wires securely with the cable strap at the bottom of the
terminal block. External force applied to the terminal block may damage it,
resulting in a short circuit, ground fault, or a ¿ re.
[Fig. 11.2.1] (P.10)
A Power source
C Ground terminal
[Fig. 11.2.2] (P.10)
A Cable strap
C Ground terminal for ¿ eld wiring connection
2 Conduit tube installation
•
Hammer the knockout holes for the conduit tube located on the base and the
bottom part of the front panel.
•
When installing the conduit tube directly through the knockout holes, remove
burrs and protect the tube with masking tape.
•
Use the conduit tube to narrow the opening if there is a possibility of small
animals entering the unit.
<B> Outside wall
<D> Floor (waterproo¿ ng)
B
Insulation
D
Caulking material
F
Waterproo¿ ng layer
H
Lagging material
10 mm [13/32''] or more
20 mm [13/16''] or more
10 mm [13/32''] or more
10 mm [13/32''] or more
) in addition to the above.
B Transmission line
B Power source cable
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