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Central air conditioning installation specification (II) - construction and installation process
Release time：2019-08-20 | Source：HUA LI JI DIAN.
Holes in the inner and outer walls
1, the outer wall punching
1.1. The property's consent must be obtained before punching, so as to avoid damaging the structure of the outer wall.
1.2, in order to prevent rain water pour, the angle of the wall hole should ensure an outward downward tilt. Drillers should be used when opening holes to ensure that the cut holes are as smooth and neat as possible.
1.3, the inside and outside of the hole should be used tube sleeve, to prevent the refrigerant insulation material by the hole inside the bristling of the bristles, and affect the indoor beauty.
2, the inner wall punched
2.1, because the steel structure of the general beam is around it, so indoor punching through the beam, please try to open in the middle of the beam.
2.2, before punching must obtain the property's consent to carry out.
Second, lifting indoor machine
1, indoor positioning
1.1, if the use of infrared locator can ensure that indoor machine installation efficiency, more stable.
1.2, according to the original design drawings and site conditions to adjust the actual installation position. Avoid installation as follows.
2, fixed
2.1, after the completion of positioning, the indoor machine with a full-threaded boom of 10mm fixed to the ceiling, to ensure that the internal machine lifting work unfolded.
3, double nut reinforced fixed
3.1, must use a double nut in the lower end of the screw to be fixed to ensure that the indoor machine lifting is firm. The use of a nut will cause the indoor machine to run during the process of loosening, causing noise.
4, horizontal lifting
4.1, indoor machine must ensure a horizontal installation, in order to reduce the operating noise, to ensure that the operation of air conditioning effect. Do not attach to the ceiling installation, this will cause resonance, resulting in increased noise.
4.2, indoor machine installation should pay attention to the two sides to reserve enough space, easy to access.
5, indoor protection
5.1, indoor machine lifting after the use of plastic film and other materials to the indoor machine wrapped up to prevent the interior decoration dust and odor into the interior of the indoor machine, resulting in the first use of a large amount of dust and odor blowing out and affect health, while dust accumulation on the indoor machine heat exchange fins will affect the thermal effect, resulting in a decline in operating efficiency.
Third, refrigerant distribution engineering, drainage pipe engineering, signal line engineering, power line engineering
1, refrigerant pipe ding
1.1, if the use of saws or cutters to cut copper pipe will cause the incision is not neat, horn mouth dressing is quite difficult, easy to cause refrigerant leakage, while the resulting copper chips will cause the air conditioning clogging period will even damage the air conditioning. Therefore, when cutting refrigerant piping must use professional tools - copper pipe cutter.
1.2, deburring is also quite important, such as not burrs may lead to the edge of the horn mouth folding edge, so that poor air tightness, causing refrigerant leakage, the same excessive whereabout burrs, will lead to refrigerant leakage.
1.3, according to different pipe diameter size, the expansion is too large or too small are easy to be poor airtight performance, resulting in refrigerant leakage.
1.4, in order to ensure the cleanliness of the refrigerant tube internal, must be in the opening to do a timely sealing bandage, to prevent moisture and impurities into the air conditioning system, so as to avoid the expansion valve, capillary blockage, compressor wear caused by failure.
2, refrigerant pipe project
2.1. When welding copper pipe with the same diameter, the expansion tube should be carried out, not the opening. The quality of the expansion tube will directly affect the quality of welding.
3, refrigerant pipe ding
3.1, in order to avoid the production of oxides, welding must do nitrogen replacement, brazing can not be immediately with cold water for irrigation cooling, must let it cool naturally, so as not to cause cracks due to different expansion coefficients at the copper pipe connection, resulting in refrigerant leakage.
4, refrigerant pipe project
4.1, with decorative belt to the refrigerant tube wrap, pay attention to the insulation material combination can not leave gaps. In addition, in order to prevent rain infiltration, and ensure that the package in the refrigerant tube decoration is not easy to bond dust, should be wrapped from the bottom up.
5, refrigerant pipe project
5.1, the distance between the two adjacent support points of the refrigerant tube is less than 1.5 meters, such as the refrigerant pipe interval is too long, back causether refrigerant tube sagging, increase refrigerant flow resistance, so that the performance of air conditioning decreased, noise increased.
5.2, should ensure that the support part is strong, to avoid vibration in the course of operation, sagging off, and affect the effect of air conditioning.
6, drainage pipe project
6.1. Drainage pipe should maintain at least 1\/100 slope, may lead to poor drainage, condensate can not be discharged in time, and even from the indoor machine water tray overflow, damage decoration.
6.2, the distance between the two support points adjacent to the drainage pipe is less than or equal to 1 meter, and ensure that the support part is strong enough to avoid the generation of air bags, resulting in poor drainage.
6.3, horizontal drainage pipe must avoid hedging phenomenon, so as to avoid slope collapse and poor drainage.
7, drainage pipe project
7.1. A single-machine drainage connection shall be made to ensure smooth drainage.
7.2, must be drainage pipe leakage experiment, detection of drainage pipe leakage.
7.3, the connection part of the insulation material must overlap appropriately, the condensing water pipe through the locking clamp and the indoor machine firmly connected. Ensure that the insulation is tight, no condensation produced.
7.4, the highest point of the drainage pipe should be set up ventilation holes to ensure the smooth discharge of condensate, breathable holes must be facing down, to avoid dust and other debris into the blockage.
8, drainage pipe engineering
8.1, confirm the end of the drain age outlet position, pay attention not directly into the sewage pipe. Direct access to the sewage drainage pipe will cause odor in the water pipe into the indoor machine, resulting in a decrease in indoor air quality. At the same time, sewage pipe blockage will cause sewage reflux into the indoor machine, and even overflow from the indoor machine, damage decoration.
8.2. It is forbidden to be connected to the sewage pipe at the end of the condensate drainage pipe.
9, signal line engineering
9.1, signal line to use Y-type terminals and outdoor machine terminal connection, to ensure that the signal stable transmission.
9.2, signal line needs to be protected by PVC wire tube and plastic hose combination.
9.3, the signal shield ingress at both ends to ground, so as to shield the external and signal between the electronic interference.
10, power cord engineering
10.1 Power cord to use O-terminals and outdoor machine terminal connection, to ensure that the power cord connection is stable, to avoid poor contact.
Four, installation of outdoor machine, nitrogen-filled pressure, vacuum drying four, installation of outdoor machine, nitrogen-filled pressure- vacuum drying
1, outdoor machine placement
The installation of outdoor machine first to leave enough space for maintenance, and to ensure that the outdoor machine around the air flow is smooth, good cooling conditions. Avoid the device from not functioning properly due to poor cooling.
2, the fixed outdoor machine
2.1, at the bottom of the base should be laid shock-proof rubber mats to prevent vibration, reduce noise.
2.2, we must pay attention to the air-conditioning outdoor machine under the discharge of heating cream water, to avoid frost drops downstairs, resulting in neighborhood disputes.
3, nitrogen-filled pressure
3.1, in order to ensure the normal operation of the system, should be connected in the internal and external machine, nitrogen charge pressure. Nitrogen charge is used to confirm the pipe system no leakage inspection work, as well as the discovery of refrigerant pipe leakage point, timely repair.
3.2, the new refrigerant R410A product pressure than R22 product pressure.
4, vacuum drying
4.1, before filling the vacuum agent to the entire system to vacuum, in order to get out of the air and moisture, to ensure that the system is dry. Vacuum drying must use a vacuum pump and ensure sufficient time to prevent moisture and air residue from remaining in the pipe sending the system into operation.
4.2, Step 1: Drain the gas from the refrigerant tube. Bring the vacuum to -775mmHgn. Step 2: On this basis, continue to pump for 1 hour, the refrigerant tube may have water vapor extraction.
fifth. Nitrogen-filled refrigerants and refrigerant leak inspection, connecting power supply
1, fill the refrigerant
Refrigerant filling is carried out with refrigerant-filled meters to ensure reasonable refrigerant filling.
2, refrigerant leak inspection
Outdoor machine installation, must be outdoor machine, indoor machine refrigerant leakage, only to confirm that everything is normal, can continue to fill the nitrogen pressure, vacuum, filling refrigerant and other work.
3.1, in order to avoid refrigerant pipe damage in high temperature power line insulation, power cord can not be laid close to the media pipe, in order to avoid interference with the control signal, the power cord and signal line should generally maintain a distance of more than 50mm.
3.2, the power cord should be connected with the connection terminal and the connection bolt.
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