NMUSD Mechanical Report_Abridged

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5200 E. La Palma, Anaheim, CA 92807 Tel: 714‐693‐2277 P a g e | 0

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Newport Mesa USD Site Survey Report for:

California Elementary

TeWinkle Intermediate

Killybrook Elementary

Paularino Elementary

Early College High

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California Elementary School Buildings / Current HVAC systems

Building 1: Administration / packaged rooftop unit & mini split

Building 2: MPR & Kitchen / NOT IN SCOPE

Building 3: Library & Computer Lab / upflow split systems

Building 4: Classrooms / upflow split systems

Building 5: Classrooms / upflow furnaces – no cooling




Building 9: Kindergarten / upflow furnaces – no cooling

Summary of Areas of Concern / Recommended Course of Action

Building 1 has old and leaky rooftop duct for the existing rooftop AC unit / demolish duct, reuse the roof openings

& reuse the rooftop unit for a new VRF system.

The MDF room mini split system at building 1 is old / replace with new mini split.

The computer lab and library at building 3 share the same conditioned air / separate the library from the

computer lab, and provide additional cooling if needed at the computer lab.

Buildings 5 through 9 are heat only upflow systems with no cooling / provide cooling coil to match existing closet

furnace in buildings 5 through 9.

Building 9 has the supply duct exposed on the roof / replace rooftop supply duct.

All classrooms and the administration rooms have relief louvers / seal all louvers within conditioned spaces.

All existing split systems and closet furnaces are about 10 years old / replace existing systems like for like with new

units.

The return plenums at buildings 3 through 8 are plywood without sheet metal lining / provide new sheet metal

return air plenums.

Overall Campus Site Assessment:

Building 1 is the administration building and has two types of systems, a packaged rooftop AC unit (see figure 1) and a

mini split system for the MDF room (see figures 2 & 3). The rooftop unit is ducted to each supply grille with the supply

duct exposed on the roof (see figures 4 & 5). The return air grille for the rooftop unit that is located in the admin lunch

room is adequately sized, but the return duct in the wall is not, so there is not adequate return air for the system. The

thermostat that is controlling the rooftop unit is not located at the back of the lunch room by the return air grille as

specified on the mechanical plans, but near the front entrance where it is exposed to sunlight, and outside air every

time the door opens (see figure 6); recommend relocating the tstat. The Mitsubishi mini split for the MDF room is old

and needs to be replaced with a new mini split. The existing rooftop unit and roof penetrations should be reused to

accommodate a new VRF system.

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The remaining buildings on the campus are all conditioned by upflow furnaces in a closet with the supply duct exposed

within the classroom (see figures 7 & 8) or exposed on the roof (building 9, see figure 9). The condensate drains to a

drywell (see figure 10) and each system is bringing in some outside air. All classrooms have an existing relief louver that

needs to be sealed (see figure 11). There are also obstructions at all the return air grilles‐these obstructions need to be

moved to provide adequate return.

Buildings 3 & 4 are conditioned using upflow split systems, and are the only buildings that have cooling coils and

condensers (see figures 12 & 13). The supply duct is exposed within the classrooms, and the return grille is at the

bottom of the unit. The library and computer lab at building 3 share the same conditioned space, and need to be

separated so that one room or the other do not get too hot or too cold (see figure 14). The condenser refrigerant lines

need to be properly supported as well (see figure 15).

Buildings 5 through 8 have the same upflow furnace in a closet, the only difference being different number of

classrooms. These buildings do not have a cooling coil connected to the upflow furnace, and so should have one put in.

Building 9 has the Kindergarten classrooms and is the only classroom building with the supply duct exposed on the

roof. This supply duct is old and needs to be replaced. This building also needs a cooling coil at each upflow furnace.

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List of equipment to consider replacing

Building 1 Administration rooms

Equipment Tag/Description

Mfg. & Model # Building Location

Rooms Serviced Total

quantity Approximate age

& condition

packaged AC unit Carrier,

48HJD007‐551 roof admin rooms 1 2005, good

split system wall unit

Mitsubishi, PK12FK3

MDF rm MDF rm 1 old, replace

split system outdoor unit

Mitsubishi, PU12EK

roof MDF rm 1 old, replace

Buildings 5 ‐ 8 Classrooms





& condition

upflow furnace in closet

Carrier, 58MXA080‐16

closet classrooms 3 2004, good

Buildings 6 & 8 only have (2) furnaces

Building 9 Kindergarten Classrooms





& condition

upflow furnace in closet


closet classrooms 2 2004, good

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Figures

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3

4

5 6

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9 10

11

12

13 14

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15

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TeWinkle Intermediate School Buildings / Current HVAC systems

A: Classrooms / closet furnace system – no cooling.

B: Classrooms / closet furnace system – no cooling.

C: teen center & classrooms / rooftop heat pumps – no AC at teen center.

D: Library, library admin rooms & computer lab / rooftop heat pumps, upflow split systems for computer lab.

E: Classrooms / rooftop heat pumps F: Classrooms / rooftop heat pumps K: Music rooms, admin rooms / packaged rooftop AC, upflow furnaces, & mini split for MDF room.


The upflow furnaces at buildings A, B, & K (band room system) do not have a cooling coil / provide cooling coil to

match existing furnace & replace rooftop supply duct.

The mechanical rooms for buildings A, B, & K need an appropriate condensate drain / provide adequate floor sink

at mechanical rooms.

The teen center (previously wood shop) at building C does not have an AC system / demolish existing Reznor unit

heaters and provide new AC system.

The upflow furnaces at building the D admin rooms (east side of building) do not have a cooling coil / demolish

furnaces and associated ductwork & grilles, and replace with new VRF system.

The existing rooftop heat pumps at the building D library (center of building) are in poor condition / replace

rooftop heat pumps like‐for‐like.

The rooftop supply duct above the computer lab (building D, west side) is old / replace rooftop supply duct for

computer lab split systems.

Building E & F have old rooftop heat pumps / replace all heat pumps like‐for‐like.

Building E has two new rooftop heat pumps (recently installed by the district) that need an economizer.

The band room at building K does not have cooling / provide cooling coil to match existing upflow furnaces or a

new packaged rooftop AC unit.

The choral room has an old Lennox rooftop unit / replace Lennox rooftop unit with York equivalent.

The dual upflow furnaces for the band room share the same outside air plenum as the MPR and kitchen system /

provide backdraft damper at the outside air takeoff for the dual upflow systems.

The administration offices at building K have upflow furnaces without cooling / demolish furnaces & rooftop

supply duct, and reuse roof penetrations for new VRF system.

Mitsubishi mini split for MDR room is old / replace mini split.

All relief louvers need to be sealed.

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This campus has many types of systems: packaged rooftop heat pump, packaged rooftop AC units, upflow furnaces,

upflow split systems, and a mini split for the MDF room in the administration offices. The only upflow systems that

have cooling are at building D for the computer lab. The remaining upflow systems need a cooling coil. The upflow

systems at the mechanical rooms also need to have an adequate condensate floor sink put in. Each classroom and also

the administration rooms have relief louvers that need to be sealed.

The music rooms are located at the north end of building K (see figures 1 & 2). These rooms have existing packaged

rooftop AC units (see figures 3 & 4). The choral room, shown in figure 2, has an old Lennox unit that needs to be

replaced. The band room is located at the north end of building K as well (see figures 5 & 6), but it is conditioned using

dual upflow furnaces (see figure 7). The supply air ductwork for this room is not per the mechanical plans, and there is

an exhaust fan installed which is not shown on the mechanical plans. The dual furnaces draw their outside air from a

plenum which is also connected to the kitchen & MPR system. There needs to be a backdraft damper installed at the

takeoff for the band room system (see figure 8). The dual furnace system for the band room needs to have cooling

coils added or replaced with a new packaged rooftop AC unit.

The south end of building K has the main administration rooms (see figures 9 & 10). These are conditioned with three

upflow furnaces without a cooling coil (see figure 11). The supply duct is on the roof and penetrates the roof to

connect to the supply grilles (see figure 12). This portion of building K is a great candidate for a new VRF system. OED

recommends demolishing the existing furnaces, supply duct & grilles, and reusing the roof penetrations for the new

VRF system. The MDF room in this portion of building K has a mini split that needs to be replaced (see figure 13).

Buildings A & B have similar floor plans and the same types of furnaces. There is a total of six upflow furnaces in

mechanical rooms with the condensate draining into a floor drain (see figure 14). The supply duct is exposed on the

roof and is old and leaky (see figure 15). The upflow furnaces need a cooling coil, and the rooftop supply duct needs to

be replaced.

Building C contains the teen center (see figure 16) and two classrooms. The classrooms are conditioned using packaged

rooftop heat pumps which are in good condition (see figure 17). The teen center currently has two old Reznor unit

heaters (see figure 18) that need to be demolished and replaced with a new AC system.

Building D has three systems; a dual split system for the computer lab, rooftop heat pumps for the library, and upflow

furnaces for the library admin rooms (no cooling). The split systems at the computer lab are in good condition and can

remain (see figure 19), but the rooftop supply duct should be replaced. The rooftop heat pumps are in poor condition

and should be swapped out like‐for‐like (see figure 20). The admin rooms on the east side of building D are a great

candidate for a new VRF system. OED recommends demolishing the existing furnaces, supply duct & grilles, and

reusing roof penetrations for new VRF system.

Buildings E & F are both the same floor plan, and are conditioned using old rooftop heat pumps (see figure 21). All

rooftop heat pumps (except two new units at building E) should be replaced like‐for‐like. The two new rooftop heat

pumps at building E need to have an economizer (see figure 22).

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Building C Classrooms & Teen Center





& condition

Unit Heater Reznor suspended

unit heater Teen Center

Teen Center 2 Old, replace

Building D

Classrooms, computer lab, library, & library admin rms





& condition

packaged heat pump

Carrier, 50HJQ005‐531

roof library 2 2005, poor

upflow furnace in mech rm


library admin area

library admin rms 1 2005, good

upflow furnace in mech rm


library admin area

library admin rms 1 2005, good

Building E Classrooms





& condition

packaged heat pump

York, B1HH036A25B

roof classrooms 6 old 1998, replace

packaged heat pump

York, B1HH048A25B


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Building F Classrooms





& condition

packaged heat pump

York, B1HH036A25B


Building K Music rooms, band room, admin rooms





& condition

upflow furnace Carrier

58MXA100‐20 mech rm

Band room 2 2005, good

Packaged rooftop AC

Lennox, GCS16‐090‐200‐1Y

roof Choral rm 1 1999, old‐replace

heat pump quietside, QSCC241

roof MDF room 1 2007, poor ‐ replace

indoor unit quietside, QSCE241

wall MDF room 1 2007, poor ‐ replace

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Figures

1 2

3

4

5 6

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8

9 10

11

12

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13 14

15 16

17 18

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19 20

21

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Killybrook Elementary School (Killybrook ES has similar floor plans & mechanical systems as California ES) Buildings / Current HVAC systems


Building 2: MPR & Kitchen / NOT IN SCOPE



Building 5: Classroom, computer lab & library / upflow furnace & mini splits









The computer lab at building 5 is being cooled with old mini split / replace with new, larger mini split.






units.


return air plenums.


Building 1 is the administration building and has two types of systems; a packaged rooftop AC unit and a mini split

system for the MDF room. The rooftop unit is ducted to each supply grille with the supply duct exposed on the roof.

The return air grille for the rooftop unit that is located in the admin lunch room is adequately sized, but the return duct

in the wall is not, so there is not adequate return air for the system. The thermostat that is controlling the rooftop unit

is not located at the back of the lunch room by the return air grille as specified on the mechanical plans, but near the

front entrance where it is exposed to sunlight, and outside air every time the door opens; recommend relocating the

tstat. The Mitsubishi mini split for the MDF room is old and needs to be replaced with a new mini split. The existing

rooftop unit and roof penetrations should be reused to accommodate a new VRF system.

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within the classroom or exposed on the roof (building 9). The condensate drains to a drywell and each system is

bringing in some outside air. All classrooms have an existing relief louver that needs to be sealed. There are also

obstructions at all the return air grilles‐these obstructions need to be moved to provide adequate return.

Building 5 contains the computer lab & library. Both rooms are cooled using old 2 ton mini splits (see figures 1 ‐ 5). The

computer lab will need additional cooling.











& condition




Mitsubishi, PK12FK3


heat pump Mitsubishi, PU12EK1


Building 5 classroom, computer lab & Library





& condition

heat pump Fujitsu AOU30C1 roof computer lab &

library 2 old, replace

indoor wall unit Fujitsu ASU30C1 wall computer lab &

library 2 old, replace

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Figures

1 2

3 4

5

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Paularino Elementary School (Paularino ES has similar floor plans & mechanical systems as California ES) Buildings / Current HVAC systems


Building 3: Classrooms & library / upflow furnaces – no cooling



Building 6: Classroom & computer lab / upflow furnaces, & mini split










The mini split cooling the computer lab at building 6 is old & undersized / replace with new, bigger mini split.




units.


return air plenums.


Building 1 is the administration building and has two types of systems; a packaged rooftop AC unit and a mini split

system for the MDF room. The rooftop unit is ducted to each supply grille with the supply duct exposed on the roof.

The return air grille for the rooftop unit that is located in the admin lunch room is adequately sized, but the return duct

in the wall is not, so there is not adequate return air for the system. The thermostat that is controlling the rooftop unit

is not located at the back of the lunch room by the return air grille as specified on the mechanical plans, but near the

front entrance where it is exposed to sunlight, and outside air every time the door opens; recommend relocating the

tstat. The Mitsubishi mini split for the MDF room is old and needs to be replaced with a new mini split. The existing

rooftop unit and roof penetrations should be reused to accommodate a new VRF system.

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within the classroom or exposed on the roof (building 9). The condensate drains to a drywell and each system is

bringing in some outside air. All classrooms have an existing relief louver that needs to be sealed. There are also

obstructions at all the return air grilles‐these obstructions need to be moved to provide adequate return.

Buildings 6 has a computer lab with about 40 PCs and is only being cooled with a 2.5 ton mini split (see figures 1 & 2);

OED recommends upsizing existing unit.











& condition




Mitsubishi, PK12FK3


heat pump Mitsubishi, PU12EK


Building 6 classroom & computer lab





& condition

heat pump Mitsubishi,

PUH‐30G6.US closet computer lab 1 old, replace

mini Mitsubishi, PCH‐3AG

ceiling hung

computer lab 1 old, replace

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Figures

1 2

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Early College High School Buildings / Current HVAC systems

Building A: Administration / packaged rooftop unit & mini split

Building B: MPR & Kitchen / NOT IN SCOPE

Building C: Classrooms / old down‐shot furnaces, and one packaged rooftop unit

Building D: Classrooms / old down‐shot furnaces – no cooling

Building E: Classrooms / old down‐shot furnaces – no cooling

Building F: Classrooms / packaged rooftop units

Building G: Classrooms / old down‐shot furnaces – no cooling

Rooms 1‐5: Classrooms / NOT IN SCOPE, brand new systems


The admin building rooftop unit is old / replace with new VRF system & replace MDF room mini split.

Classroom buildings C through E, and also building G have old, down‐shot furnaces / demo furnaces and replace

with new YORK packaged rooftop units similar to those installed at rooms 1‐5 or upflow split systems.

The rooftop units installed at building F are old / replace with new YORK rooftop units.

The computer lab at portable building room 10 needs additional cooling; current system is a 2.5 ton Bard wall

mount unit, and there are 30 PCs.

The Conference room at portable building room 13 does not have CO2 sensor, is sharing a zone with another

space and the tstat is not inside the conference room / provide demand control ventilation and dedicated zone.

Classrooms and administration rooms have relief louvers / seal all relief louvers.


This campus has a similar floor plan as California Elementary, but many of the classrooms have very old systems. The

administration building needs to have a new VRF system put in to replace the current rooftop unit (see figure 1). The

classrooms at buildings C, D, and E are currently being heated by old downshot furnaces (see figures 2 & 3). These

furnaces need to be demolished and replaced with packaged rooftop AC units or upflow split systems like at California

Elementary, building 3.

Building F has rooftop units (see figure 4), but these are old, and should be replaced with newer models. Building G

contains the kindergarten classrooms and has old downshot furnaces that are not operational (see figures 5). These

rooms should be conditioned using upflow split systems or new rooftop units.

The computer lab at portable building room 10 only has one Bard wall mount unit conditioning the space with 30 PCs,

and needs additional cooling (see figure 6). The conference room at portable building room 13 has the thermostat

outside the conference room, and only one supply grille within the conference room space. There is also no CO2

sensor in place & only one zone for the conference room, and an adjacent room. This area needs to be split into two

separate zones with demand control ventilation for the conference room. The classrooms labeled 1 through 5 have

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brand new YORK rooftop units (see figure 7). These rooms are not within the scope of work, but the current systems

can be used as a template for other classrooms at this campus.


Building A Administration





& condition

heat pump Carrier,

38AN012320 roof MDF room 1 old, replace

indoor unit to match heat pump

Carrier model MDF room

MDF room 1 old, replace

packaged rooftop AC

Trane, 2YCC3048A1075AA

roof admin rooms 1 2007, poor

Building C classrooms





& condition

roodtop packaged AC

Trane, YCC036F1M0BJ

roof classroom 1 2002, poor‐replace

downshot furnace York diamond 80 mech room

classrooms 2 old, replace

Building D classrooms





& condition



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Building E classrooms





& condition



Building F classrooms





& condition

packaged rooftop AC

Rheem, RRKA‐A036JK06X

roof classrooms 3 1999, old‐replace

Building G Kindergarten classrooms





& condition



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Figures

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2

3 4

5 6

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NMUSD Mechanical Report_Abridged

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