23 81 28.10 22.pdf

Building 1 Renovation Work Order #19-0037 Camp Lejeune, Jacksonville, NC

SECTION 23 81 28.10 22

VARIABLE REFRIGERANT FLOW (VRF) AIR CONDITIONING AND HEAT PUMP EQUIPMENT

02/17

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ANSI/ASHRAE 15 & 34 (2016) ANSI/ASHRAE Standard 15-Safety Standard for Refrigeration Systems and ANSI/ASHRAE Standard 34-Designation and Safety Classification of Refrigerants

ASHRAE 90.1 - IP (2016) Energy Standard for Buildings Except Low-Rise Residential Buildings

ETL TESTING LABORATORIES (ETL)

ETL DLP (updated continuously) ETL Listed Mark Directory

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 9001 (2008; Corr 1 2009) Quality Management Systems- Requirements

ISO 14001 (2015) Environmental Management Systems — Requirements with Guidance for Use

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

17-14; TIA 17-15; TIA 17-16; TIA 17-17 )

National Electrical Code

U.S. DEPARTMENT OF ENERGY (DOE)

Energy Star (1992; R 2006) Energy Star Energy Efficiency Labeling System (FEMP)

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance to Section 01 33 29.05 20 SUSTAINABILITY

SECTION 23 81 28.10 22 Page 3

REPORTING FOR DESIGN-BUILD. Submit the following in accordance with Section 01 33 00.05 20 CONSTRUCTION SUBMITTAL PROCEDURES::

SD-02 Shop Drawings

Refrigerant Piping System Layout ; G

Submit Shop Drawings, at least 5 weeks prior to beginning construction, provided in adequate detail to demonstrate compliance with contract requirements.

SD-03 Product Data

Indoor Units ; G

Outdoor Units ; G

Branch Selector Box ; G

Refrigerant Valves ; G

Laptop Computer ; G

SD-06 Test Reports

Performance Tests ; G

SD-08 Manufacturer's Instructions

Manufacturers Installation Instructions

Operation and Maintenance Training

SD-10 Operation and Maintenance Data

Submit in accordance with Section 01 78 23 OPERATION AND

MAINTENANCE DATA.

Operation and Maintenance Manuals ; G

Indoor Units , Data Package 3

Outdoor Units , Data Package 3

1.3 GENERAL REQUIREMENTS

Section 23 73 33 HEATING, VENTILATING, AND COOLING SYSTEM applies to work specified in this section.

Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS applies to work specified in this section.

1.4 SYSTEM DESCRIPTION

a. Provide a complete air cooled, multiple evaporator, direct expansion heating and cooling system. The system shall consist of multiple evaporators using PID control The outdoor unit shall be a direct expansion (DX), air-cooled heat recovery air-conditioning system, variable speed driven compressor multi zone split system, using R410A

SECTION 23 81 28.10 22 Page 4 refrigerant. The outdoor unit may connect an indoor evaporator capacity up to 130 percent to that of the outdoor condensing unit capacity. All indoor units shall each be capable of operating separately with individual temperature control.

b. The outdoor units shall be interconnected to the indoor units in accordance with the manufacturer's engineering data detailing each available indoor unit. The indoor units shall be connected to the outdoor utilizing the manufacturer's specified piping joints and headers.

1.5 QUALITY ASSURANCE

a. The units shall be listed by ETL DLP and bear the ETL label.

b. All wiring shall be in accordance with NFPA 70 , the National Electric Code.

c. The system will bear the Energy Star label.

d. The system will be produced in an ISO 9001 and ISO 14001 facility.

The system shall be factory tested for safety and function.

e. The outdoor unit shall be factory charged with R410A.

f. The installing contractor shall be Certified by equipment manufacturer.

g. VRF manufacturer must have local support with certified technicians within a 60 mile radius of the owner.

1.6 DELIVERY, STORAGE, AND HANDLING

Unit shall be stored and handled according to the manufacturer's recommendations.

1.7 WARRANTY

The units shall have a manufacturer's parts and labor warranty for a period of one (1) year from date of installation. The compressors shall have a minimum warranty of 5 years parts and labor. The units shall have a manufacturer's extended parts warranty period of ten (10) years from date of start-up.

Warranty letter must be provided on VRF manufacturer's letterhead.

PART 2 PRODUCTS

2.1 OUTDOOR UNITS

2.1.1 General

The outdoor unit shall be designed specifically for use with all other series components.

a. The outdoor unit shall be factory assembled and pre-wired with all necessary electronic and refrigerant controls. The refrigeration circuit of the condensing unit shall consist of a scroll compressor, motors, fans, condenser coil, electronic expansion valve, solenoid valves, 4 way valve, distribution headers, capillaries, filters, shut

SECTION 23 81 28.10 22 Page 5 off valves, oil separators, service parts, liquid receivers and accumulators.

b. Both liquid and suction lines must be individually insulated between the outdoor and indoor units.

c. The outdoor unit can be wired and piped with outdoor unit access from left, right or rear.

d. The connection ratio of indoor units must be individually insulated between the outdoor and indoor units.

e. The sound pressure dB(A) at rated conditions shall be a value of 58 decibels at 3 feet from the front of the unit. The outdoor unit shall be capable of operating at further reduced noise during the night time.

f. The system will automatically restart operation after a power failure and will not cause any settings to be lost, thus eliminating the need for re-programming.

g. The outdoor unit shall be modular in design and should allow for a side-by-side installation with minimum spacing.

h. The following safety devices shall be included on the condensing unit: high pressure switch, control circuit fuses, crankcase heaters, fusible plug, high pressure switch, overload relay, inverter overload protector, thermal protectors for compressor and fan motors, overcurrent protection for the inverter and anti-recycling timers. To ensure the liquid refrigerant does not flash when supplying to the various fan coil units, the circuit shall be provided with a sub-cooling feature. Oil recovery cycle shall be automatic occurring 2 hours after start of operation and then every 8 hours of operation.

i. The outdoor unit shall be capable of heating operation at 0 degrees F dry bulb ambient temperature without additional low ambient controls.

2.1.2 Condenser Coil

a. The condenser coil shall be manufactured from copper tubes expanded into aluminum fins to form a mechanical bond.

b. The coil shall be of a waffle louver fin and high heat exchanger, rifled bore tube design to ensure highly efficient performance.

c. The coils shall be complete with corrosion treatment passing ASTM B117 90 3000 hour salt spray resistance test as installed.

d. Coils shall be tested in accordance with ANSI/ASHRAE 15 & 34 at the factory and be suitable for the working pressure of the installed system.

2.1.3 Compressor

a. The scroll compressor shall be variable speed controlled which is capable of changing the speed to follow the variations in total cooling load as determined by the suction gas pressure as measured in the condensing unit.

b. The inverter driven compressor in each condensing unit shall be of

SECTION 23 81 28.10 22 Page 6 highly efficient reluctance DC, hermetically sealed scroll.

c. The capacity control range shall be 6 to 100 percent, with 29 individual capacity steps. Each non-inverter compressor shall also be of the hermetically sealed scroll type.

d. Each compressor shall be equipped with a crankcase heater, high pressure safety switch, and internal thermal overload protector.

e. Oil separator shall be standard with equipment together with an oil balancing circuit.

f. The compressor shall be mounted to avoid the transmission of vibration.

g. The control wiring shall be a two-wire multiplex transmission system, making it possible to connect multiple indoor units to one outdoor unit with 2-cable wire, thus simplifying the wiring operation.

h. The VRV system must interface with the BACnet DDC system as described in Section 23 09 23.13 BACnet DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC.

i. The control wiring lengths are: outdoor to indoor unit is 6,665 ft, outdoor to central controller is 3,330 ft, outdoor unit to remote controller is 1,665 ft. Wiring type is 16 or 18 AWG, 2 wire, non-polarity, non-shielded, stranded.

2.2 BRANCH SELECTOR BOX FOR VRV HEAT RECOVERY SYSTEM

2.2.1 General

The branch selector boxes shall be provided for use with heat recovery system components.

a. These selector boxes shall be factory assembled, wired and piped.

Provide refrigeration isolation valves at selector box.

b. The sum of connected capacity of all indoor air handlers shall range up to 130 percent of rated capacity.

c. These branch controllers must be run tested at the factory.

d. These selector boxes must be mounted indoors.

e. When simultaneously heating and cooling, the units in heated mode shall energize their sub cooling solenoid valve.

2.2.2 Unit Cabinet

a. These units shall have a galvanized steel plate casing.

b. Each cabinet shall house multiple refrigeration control valves and a liquid gas separator.

c. The cabinet shall contain a tube in tube heat exchanger.

d. The unit shall have sound absorption thermal insulation material made of flame and heat resistant foamed polyethylene.

SECTION 23 81 28.10 22 Page 7

2.2.3 Refrigerant Valves

a. The unit shall be furnished with a 3-way refrigerant valve to control the direction of refrigerant flow.

b. Electronic expansion valves shall be used to control the variable refrigerant flow.

c. The refrigerant connections must be of the solder-joint type.

2.2.4 Drainage

a. Provide drain connectins as required by equipment manufacturer .

b. The control voltage between the indoor and outdoor unit shall be non-shielded 2 conductor cable.

2.3 INDOOR UNITS

2.3.1 General

The indoor unit shall be a fan coil unit, style indicated in schedules, operable with R410A refrigerant, equipped with an electronic expansion valve. The unit shall be constructed of a galvanized steel casing. It shall be available in capacities indicated in schedules and compatible with the outdoor unit heat pump and heat recovery model. Unit shall be a low height (11-7/8") construction. Computerized PID control shall be used to maintain room temperature within 1 degrees F. The unit shall be equipped with a programmed drying mechanism that dehumidifies while inhibiting changes in room temperature. Included as standard equipment, MERV B filters, a condensate drain pan and drain pump kit. The indoor units sound pressure shall range from 35 dB(A) to 43 dB(A) at low speed 5 feet below the suction grille.

2.3.2 Indoor Unit

a. The indoor unit shall be completely factory assembled and tested.

Included in the unit is factory wiring, piping, electronic proportional expansion valve, control circuit board, fan motor thermal protector, solder-joint connections, condensate drain pan, condensate drain pump, self-diagnostics, auto-restart function, 3-minute fused time delay, and test run switch. The unit shall have an adjustable external static pressure switch.

b. Indoor unit and refrigerant pipes will be charged with dehydrated air prior to shipment from the factory.

c. Both refrigerant lines shall be insulated from the outdoor unit.

d. Return air shall be through a net mold resistant filter.

e. The indoor units shall be equipped with a condensate pan and condensate pump.

f. The indoor units shall be equipped with a return air thermistor.

g. Switch box shall be reached from the side or bottom for ease of service and maintenance.

SECTION 23 81 28.10 22 Page 8

2.3.3 Unit Cabinet

The cabinet shall be constructed with sound absorbing foamed polystyrene and polyethylene insulation.

2.3.4 Fan

The fan shall be direct-drive Sirocco type fan, statically and dynamically balanced impeller with high and low fan speeds available. The air flow rate shall be available in high and low settings. The fan motor shall be thermally protected and shall be tested in accordance with ASHRAE 90.1 - IP .

2.3.5 Filter

The return air shall be filtered by means of a washable long-life filter with mildew proof resin.

2.3.6 Coil

a. Coils shall be the direct expansion type constructed from copper tubes expanded into aluminum fins to form a mechanical bond.

b. The coil shall be a waffle louver fin and high heat exchange, rifled bore tube design to ensure highly efficient performance.

c. The coil shall be a 3 row cross fin copper evaporator coil with 14 FPI design completely factory tested.

d. The refrigerant connections shall be solder-joint connections and the condensate will be 1 -1/4 inch outside diameter PVC.

e. A condensate pan shall be located under the coil.

f. A condensate pump shall be located below the coil in the condensate pan with a built in safety arm.

g. A thermistor will be located on the liquid and gas line.

2.3.7 Electrical

Transmission (control) wiring between the indoor and outdoor unit shall be a maximum of 3,280 feet (total 6,560 feet). Transmission (control) wiring between the indoor and remote controller shall be a maximum distance of 1,640 feet.

2.3.8 Control

The unit shall have controls to perform input functions necessary to operate the system. The unit shall be compatible with interfacing with connection to BACnet networks.

2.3.9 Accessories

Provide a wall mounted, hard wired remote sensor kit for ceiling-embedded type fan coils. The temperature sensor shall be located where indicated in the documents, if not indicated, contractor shall request a location from the engineer in writing.

SECTION 23 81 28.10 22 Page 9

2.4 INDIVIDUAL ZONE CONTROLLER - WIRED REMOTE CONTROLLER

2.4.1 Physical Characteristics

The control system shall be a neutral color plastic material. Each control may have a Liquid Crystal Display (LCD).

2.4.2 Electrical Characteristics

2.4.2.1 General

From each circuit board to the controls, the electrical voltage shall be 16 volts DC.

2.4.2.2 Wiring

Control wiring shall be installed in a daisy chain configuration from indoor unit to indoor unit then to the branch selector box and outdoor unit. Control wiring shall run from the indoor unit terminal block to the specific. The wire shall be a non-shielded, 2-core sheathed vinyl cord or cable, size AWG18-2 or AWG16-2 .

2.4.3 Controller Characteristics

The wired remote controller shall be able to control 1 group (maximum of 16 fan coil units) and shall be able to function as follows:

a. The controller shall have a maximum wiring length of 1,640 feet.

b. The controller shall have a self diagnosis function that constantly monitors the system for malfunctions (total of 80 components).

c. The controller shall be able to immediately display fault location and condition.

d. An LCD digital display will allow the temperature to be set in 1 degrees F units.

e. The controller shall monitor room temperature and preset temperature by microcomputer and can select cool/heat operation mode automatically.

f. The controller shall allow the user to select cool / heat / fan operation mode with indoor remote controller of choice without using the cool / heat selector.

The wired remote controller shall have the following features:

Operation Start/Stop Operation Mode Temperature Settings 60 Degrees F - 90 Degrees F Set Point Range Fan Speed Airflow Direction

Monitoring Status Malfunction Flashing Malfunction Content Filter Sign

SECTION 23 81 28.10 22 Page 10

Operation Mode Temperature Setting Permit/Prohibit Selection Fan Speed Airflow Direction

Control Management Field Setting Mode Group Setting Auto Re-Start

2.5 INTELLIGENT TOUCH CONTROLLER

2.5.1 Physical Characteristics

The control system shall be a neutral color plastic material. The controller has a 5.7" Liquid Crystal Display (LCD, QVGA 320x240, 4096 colors).

2.5.2 Electrical Characteristics

2.5.2.1 General

From each outdoor unit circuit board to the I-touch controller, the daisy chained wiring electrical voltage shall be 16 volts DC.

2.5.2.2 Wiring

For heat recovery the control wiring shall be installed in a daisy chain configuration from outdoor unit to each branch selector box then from the branch selector box to the indoor unit.

2.5.2.3 Control Wiring Size

The wire shall be a non-shielded, stranded, 2 conductor PVC or vinyl clad cable. 18-gauge copper cabling specified. Application of UV stabilized cable should be standard when exposed to outside elements. Plenum rated where applicable. Maximum wiring length between controller and indoor units: 3,280 ft.

2.5.2.4 Power Supply to Controller

24V AC (transformer to be field supplied).

2.5.3 Controller Characteristics

The intelligent controller shall be able to control, via a full color LCD touch screen, up to 10 outdoor units and 64 indoor unit groups (maximum 128 Fan Coil Units) with the following functions:

a. On/Off selection for each fan coil unit or group

b. Temperature set point adjustment for each fan coil unit or group

c. Fan speed adjustment for each fan coil unit or group

d. Heat/cool/automatic changeover mode selection

e. Forced shutdown terminals

SECTION 23 81 28.10 22 Page 11

f. Priority settings for restriction of local access for start/stop, heat/cool mode and set point adjustment (at local remote controllers if installed)

g. Temperature limitation in both heating and cooling mode

h. Weekly schedule with start up and shut off times, temperature settings and operation modes, 16 operations/ each day can be set in one schedule, and 8 different schedules are available. In addition a yearly calendar is also available for holidays or periods of non use.

i. Actual time and display setting

j. Reset ability for malfunction codes and filter maintenance warning

k. Maximum 13 months backup power supply to maintain the memory

l. Malfunction reports can be sent via e-mail to a cell phone or a PC

m. Remote monitoring via PC, network and web browser (optional).

Available web browser are: Real time status monitoring/Operation/Malfunction history display/User password setting and schedule setting

Manufacturer to provide Web based software for off-site monitoring purposes.

2.6 Maintenance Tool / Laptop Computer

Provide VRF manufacturers maintenance tool and dedicated laptop computer appropriate for operating the maintenance tool. This tool shall be designed for service, start-up, and troubleshooting of the VRF system(s) and include all necessary components necessary for operation. The owner is to be provided with compatible software and any required keys, usernames and passwords.

PART 3 EXECUTION

3.1 INSTALLATION

The system shall be installed by factory trained and authorized contractor. The contractor shall install the VRF system in accordance with the recommendations of the VRF manufacturer as outlined in the Manufacturers Installation Instructions . Provide a Refrigerant Piping System Layout for approval along with the VRF System equipment.

3.2 START-UP

Equipment start-up, performance tests , and commissioning shall be provided by a factory trained and authorized contractor. Control start-up and commissioning shall be provided by the factory.

3.3 PRODUCT SUPPORT

Installation, Operation and Maintenance Manuals are to be provided to the owner once commissioning is complete. Forty ( 40) hours of on-site Operation and Maintenance training will be provided to the owner and owner's personnel once commissioning is complete. A minimum of two (2) owner's personnel must complete "Certification" as part of on-site

SECTION 23 81 28.10 22 Page 12 training.

-- End of Section --

SECTION 23 81 28.10 22 Page 13

2.4.3 Controller Characteristics

2.5.3 Controller Characteristics

2.6 Maintenance Tool / Laptop Computer