WAC 51-11-1132   Alterations and repairs.  Alterations and repairs to buildings or portions thereof originally constructed subject to the requirements of this Code shall conform to the provisions of this Code without the use of the exception in Section 1130. Other alterations and repairs may be made to existing buildings and moved buildings without making the entire building comply with all of the requirements of this Code for new buildings, provided the following requirements are met:


1132.1 Building Envelope: Alterations or repairs shall comply with nominal R-values and glazing requirements in Table 13-1 or 13-2.


EXCEPTIONS: 1. Storm windows installed over existing glazing.
2. Glass replaced in existing sash and frame provided that glazing is of equal or lower U-factor.
3. For solar heat gain coefficient compliance, glazing with a solar heat gain coefficient equal to or lower than that of the other existing glazing.
4. Existing roof/ceiling, wall or floor cavities exposed during construction provided that these cavities are insulated to full depth with insulation having a minimum nominal value of R-3.0 per inch installed per Sections 1311 and 1313.
5. Existing walls and floors without framing cavities, provided that any new cavities added to existing walls and floors comply with Exception 4.
6. Existing roofs where the roof membrane is being replaced and
a. The roof sheathing or roof insulation is not exposed; or
b.     If there is existing roof insulation below the deck.
In no case shall the energy efficiency of the building be decreased.

1132.2 Building Mechanical Systems: Those parts of systems which are altered or replaced shall comply with Chapter 14 of this Code.

     All new systems in existing buildings, including packaged unitary equipment and packaged split systems, shall comply with Chapter 14.

     Where mechanical cooling is added to a space that was not previously cooled, the mechanical cooling system shall comply with Sections 1413 and either 1423 or 1433.


EXCEPTIONS: These exceptions only apply to situations where mechanical cooling is added to a space that was not previously cooled.
1. Water-cooled refrigeration equipment provided with a water economizer meeting the requirements of Section 1413 need not comply with 1423 or 1433. This exception shall not be used for RS-29 analysis.
2. Alternate designs that are not in full compliance with this Code may be approved when the building official determines that existing building or occupancy constraints make full compliance impractical or where full compliance would be economically impractical.

     Alterations to existing mechanical cooling systems shall not decrease economizer capacity unless the system complies with Sections 1413 and either 1423 or 1433. In addition, for existing mechanical cooling systems that do not comply with Sections 1413 and either 1423 or 1433, including both the individual unit size limits and the total building capacity limits on units without economizer, other alterations shall comply with Table 11-1.

     Existing equipment currently in use may be relocated within the same floor or same tenant space if removed and reinstalled within the same permit.


TABLE 11-1: ECONOMIZER COMPLIANCE OPTIONS FOR MECHANICAL ALTERATIONS
  Option A Option B

     (alternate to A)		 Option C

     (alternate to A)		 Option D

     (alternate to A)
Unit Type Any alteration with new or replacement equipment Replacement unit of the same type with the same or smaller output capacity Replacement unit of the same type with a larger output capacity New equipment added to existing system or replacement unit of a different type
1. Packaged Units Efficiency: min.1

Economizer: 14332		 Efficiency: min.1

Economizer: 14332,3		 Efficiency: min.1

Economizer: 14332,3		 Efficiency: min.1

Economizer: 14332,4
2. Split Systems Efficiency: min.1

Economizer: 14332		 Efficiency: + 10/5%5

Economizer: shall not decrease existing economizer capability		 Only for new units < 54,000 Btu/h replacing unit installed prior to 1991 (one of two):

Efficiency: + 10/5%5

Economizer: 50%6		 Efficiency: min.1

Economizer: 14332,4
For units > 54,000 Btu/h or any units installed after 1991: Option A
3. Water Source Heat Pump Efficiency: min.1

Economizer: 14332		 (two of three):

Efficiency: + 10/5%5

Flow control valve7

Economizer: 50%6		 (three of three):

Efficiency: + 10/5%5

Flow control valve7 Economizer: 50%6 (except for certain pre-1991 systems8)		 Efficiency: min.1

Economizer: 14332,4

(except for certain pre-1991 systems8)
4. Hydronic Economizer using Air-Cooled Heat Rejection Equipment (Dry Cooler) Efficiency: min.1

Economizer: 14332		 Efficiency: + 10/5%5

Economizer: shall not decrease existing economizer capacity		 Option A Efficiency: min.1

Economizer: 14332,4
5. Air-Handling Unit (including fan coil units) where the system has an air-cooled chiller Efficiency: min.1

Economizer: 14332		 Economizer: shall not decrease existing economizer capacity Option A

(except for certain pre-1991 systems8)		 Option A

(except for certain pre-1991 systems8)
6. Air-Handling Unit (including fan coil units) and Water-cooled Process Equipment, where the system has a water-cooled chiller10 Efficiency: min.1

Economizer: 14332		 Economizer: shall not decrease existing economizer capacity Option A

(except for certain pre-1991 systems8 and certain 1991-2004 systems9)		 Efficiency: min.1

Economizer: 14332,4 (except for certain pre-1991 systems8 and certain 1991-2004 systems9)
7. Cooling Tower Efficiency: min.1

Economizer: 14332		 No requirements Option A Option A
8. Air-Cooled Chiller Efficiency: min.1

Economizer: 14332		 Efficiency: + 5%11

Economizer: shall not decrease existing economizer capacity		 Efficiency (two of two): (1) + 10%12 and (2) multistage

Economizer: shall not decrease existing economizer capacity		 Efficiency: min.1

Economizer: 14332,4
9. Water-Cooled Chiller Efficiency: min.1

Economizer: 14332		 Efficiency (one of two): (1) + 10%13 or (2) plate frame heat exchanger15

Economizer: shall not decrease existing economizer capacity		 Efficiency (two of two): (1) + 15%14 and (2) plate frame heat exchanger15

Economizer: shall not decrease existing economizer capacity		 Efficiency: min.1

Economizer: 14332,4
10. Boiler Efficiency: min.1

Economizer: 14332		 Efficiency: + 8%16

Economizer: shall not decrease existing economizer capacity		 Efficiency: + 8%16

Economizer: shall not decrease existing economizer capacity		 Efficiency: min.1

Economizer: 14332,4

1. Minimum equipment efficiency shall comply with Section 1411.1 and Tables 14-1A through M.
2. System and building shall comply with Section 1433 (including both the individual unit size limits and the total building capacity limits on units without economizer). It is acceptable to comply using one of the exceptions to Section 1433.
3. All equipment replaced in an existing building shall have air economizer complying with Sections 1413 and 1433 unless both the individual unit size and the total capacity of units without air economizer in the building is less than that allowed in Exception 1 to Section 1433.
4. All separate new equipment added to an existing building shall have air economizer complying with Sections 1413 and 1433 unless both the individual unit size and the total capacity of units without air economizer in the building is less than that allowed in Exception 1 to Section 1433.
5. Equipment shall have a capacity-weighted average cooling system efficiency:
a. For units with a cooling capacity below 54,000 Btu/h, a minimum of 10% greater than the requirements in Tables 14-1A and 14-1B (1.10 x values in Tables 14-1A and 14-1B).
b. For units with a cooling capacity of 54,000 Btu/h and greater, a minimum of 5% greater than the requirements in Tables 14-1A and 14-1B (1.05 x values in Tables 14-1A and 14-1B).
6. Minimum of 50% air economizer that is ducted in a fully enclosed path directly to every heat pump unit in each zone, except that ducts may terminate within 12 inches of the intake to an HVAC unit provided that they are physically fastened so that the outside air duct is directed into the unit intake. If this is an increase in the amount of outside air supplied to this unit, the outside air supply system shall be capable of providing this additional outside air and equipped with economizer control.
7. Have flow control valve to eliminate flow through the heat pumps that are not in operation with variable speed pumping control complying with Section 1432.2.2 for that heat pump.
  – When total capacity of units with flow control valves exceeds 15% of total system capacity, a variable frequency drive shall be installed on the main loop pump.
  – As an alternate to this requirement, have a capacity-weighted average cooling system efficiency that is 5% greater than the requirements in note 5 (i.e., a minimum of 15%/10% greater than the requirements in Tables 14-1A and 14-1B (1.15/1.10 x values in Tables 14-1A and 14-1B).)
8. Systems installed prior to 1991 without fully utilized capacity are allowed to comply with Option B, provided that the individual unit cooling capacity does not exceed 90,000 Btu/h.
9. Economizer not required for systems installed with water economizer plate and frame heat exchanger complying with previous codes between 1991 and June 2004, provided that the total fan coil load does not exceed the existing or added capacity of the heat exchangers.
10. For water-cooled process equipment where the manufacturer's specifications require colder temperatures than available with waterside economizer, that portion of the load is exempt from the economizer requirements.
11. The air-cooled chiller shall have an IPLV efficiency that is a minimum of 5% greater than the IPLV requirements in Table 14-1C (1.05 x IPLV values in Table 14-1C).
12. The air-cooled chiller shall:
a. Have an IPLV efficiency that is a minimum of 10% greater than the IPLV requirements in Table 14-1C (1.10 x IPLV values in Table 14-1C), and
b. Be multistage with a minimum of two compressors.
13. The water-cooled chiller shall have an NPLV efficiency that is a minimum of 10% greater than the NPLV requirements in Table 14-1K, Table 14-1L, or Table 14-1M (1.10 x NPLV values in Table 14-1K, Table 14-1L, or Table 14-1M).
14. The water-cooled chiller shall have an NPLV efficiency that is a minimum of 15% greater than the NPLV requirements in Table 14-1K, Table 14-1L, or Table 14-1M (1.15 x NPLV values in Table 14-1K, Table 14-1L, or Table 14-1M).
15. Economizer cooling shall be provided by adding a plate-frame heat exchanger on the waterside with a capacity that is a minimum of 20% of the chiller capacity at standard ARI rating conditions.
16. The replacement boiler shall have an efficiency that is a minimum of 8% higher than the value in Table 14-1F (1.08 x value in Table 14-1F), except for electric boilers.

1132.3 Lighting and Motors: Where the use in a space changes from one use in Table 15-1 to another use in Table 15-1, the installed lighting wattage shall comply with Section 1521 or 1531.

     Other tenant improvements, alterations or repairs where 60 percent or more of the fixtures in a space enclosed by walls or ceiling-height partitions are new shall comply with Sections 1531 and 1532. (Where this threshold is triggered, the areas of the affected spaces may be combined for lighting code compliance calculations.) Where less than 60 percent of the fixtures in a space enclosed by walls or ceiling-height partitions are new, the installed lighting wattage shall be maintained or reduced. Where 60 percent or more of the lighting fixtures in a suspended ceiling are new, and the existing insulation is on the suspended ceiling, the roof/ceiling assembly shall be insulated according to the provisions of Chapter 13 Section 1311.2.


     Where new wiring is being installed to serve added fixtures and/or fixtures are being relocated to a new circuit, controls shall comply with Sections 1513.1 through 1513.5 and, as applicable, 1513.7. In addition, office areas less than 300 ft2 enclosed by walls or ceiling-height partitions, and all meeting and conference rooms, and all school classrooms, shall be equipped with occupancy sensors that comply with Sections 1513.6 and 1513.7. Where a new lighting panel (or a moved lighting panel) with all new raceway and conductor wiring from the panel to the fixtures is being installed, controls shall also comply with the other requirements in Sections 1513.6 and 1513.7.


     Where new walls or ceiling-height partitions are added to an existing space and create a new enclosed space, but the lighting fixtures are not being changed, other than being relocated, the new enclosed space shall have controls that comply with Sections 1513.1 through 1513.2, 1513.4, and 1513.6 through 1513.7.


     Those motors which are altered or replaced shall comply with Section 1511.



[Statutory Authority: RCW 19.27A.022, 19.27A.025, 19.27A.045, and chapters 19.27 and 34.05 RCW. 07-01-089, § 51-11-1132, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapters 19.27, 19.27A, and 34.05 RCW. 05-01-013, § 51-11-1132, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27A.025, 19.27A.045. 01-03-010, § 51-11-1132, filed 1/5/01, effective 7/1/01; 98-03-003, § 51-11-1132, filed 1/8/98, effective 7/1/98. Statutory Authority: RCW 19.27A.025. 93-21-052, § 51-11-1132, filed 10/18/93, effective 4/1/94.]