mechanical inspection â€“ heating & ventilation

Mechanical Inspection – Heating & Ventilation

June 2005 Glacier Valley Elementary School Condition Survey Report 17 of 178

0821 Heating Equipment – Boilers, circulation pumps, etc.

Building is heated with two oil fired hot water boilers. Boiler B1 and B2 are Cleaver Brooks package fire tube type boilers installed in 1963. Capacity is 3,347,000 BTU/Hr. Chimney for boilers B1 and B2 is a single wall forced draft type and is connected directly to the boiler. Heating water is distributed through out the building through a multitude of pumps for service to exterior wall heating units, convector at entry ways, pump at each heating coils for all ventilation fan units.

Condition of boilers is fair. The boilers, over 40 years old, have reached the end of service life. Remaining life expectancy: 05 years.

Condition of the pumps are fair. Majority of the pumps are the original base mounted and inline circulation pumps installed in the original construction. Some of been replaced. It would be advantageous to replace the multitude of pumps through out the building with a duplex lead/lag pumping system with VFD motor with two way valves at the heating coils. Remaining life expectancy: 510 years.


June 2005 Glacier Valley Elementary School Condition Survey Report Page 118 of 178

Deficiency

08211 Old Boilers The original 42 year old oil fired boilers are past their service life.

Deficiency category: RR

Remedy Replace (2) boiler with two cast iron section boilers with two new burners and appurtenances, each sized to serve 6075% of full heating load of building. Control the boilers in a lead/lag system. Reconfigure heating supply, heating return, oil supply, and oil return piping as required. Install new breeching and chimney. Remove existing breeching. Breeching to be double wall positive pressure type with 1 inch thick insulation. Provide house keeping pads under boilers.

Estimated Construction Cost: $333,000. This cost includes renovation of boiler room piping and trim.



Deficiency

08212 Pumps Multiple redundant pumps through out the building. Excessive energy use of constant volume multiple pumps. Currently at least 8 circualting pumps are operating continuously whether needed or not. During warmer weather (summer and shoulder months) the pumps are typically shut off.

Deficiency category: RR, E

Remedy Remove all heating pumps (12) through out the building. Install two base mounted end suction pumps with variable frequency drives sized for full heating load of building. Remove all three way valves and replace with twoway valves. Install pressure sensors in three locations throughout the facility to control main circulation pumps. Reconfigure piping as required. The main ciculating pumps would only pump the amount of heating water actually required based upon control from the pressure sensors.

Estimated Construction Cost: $ 101,400.



0823 Ventilation Equipment – Fans, makeup units, mixing boxes, etc.

Ventilation systems VU1 and VU2 serve the bulk of the classrooms and occupied areas of the school. Both systems are full outside air and full exhaust system; there are no mixing dampers or returned air.

Both systems are designed to deliver the correct amount of outside air to the classrooms as required by IMC. A typical classroom was designed to have 600 cfm of outside air supplied to it. IMC requires 15 cfm OSA per occupant to be delivered for classrooms resulting in a maximum occupancy load for a classroom of 40. However the design of 600 cfm for a classroom results in an approximate ventilation air change every 15 minutes. Modern classrooms would be designed with an air change every 79 minutes, nearly double what is currently being supplied. Existing ductwork and wall grilles are not sized for a significant increase in ventilation volume.

VU1 is a cabinet fan unit with filters, heating coil, and fan section and supplies ventilation air to the south wing classrooms and office area. The fan unit is an 8,630 cfm unit and is located in the south wing janitor storage area. This fan unit was installed in the original 1963 construction. Outside air and exhsut air are transported through an underground utilidor under the adjacent toilet rooms from the fans to a relief hood on the roof and an outside air louver on the exterior wall. The fan has dirty filters installed. Fan is very dirty. Spot measurements of diffusers in classrooms were done and the unit appears to be delivering roughly about design air volumes.

VU2 is a cabinet fan unit with filters, heating coil, and fan section and supplies ventilation air to the east wing classrooms and office area. Fan unit is a 7,650 cfm unit and is located in the first floor east wing fan room. The fan unit was installed in the original 1963 construction. Fan casing and filters are dirty. Spot measurements of diffusers in classrooms were done and the unit appears to be delivering roughly 10% less than design air volumes.

VU3 is a cabinet fan unit with filters, heating coil, and fan section and serves the Multipurpose Area. Fan unit is located in the above the adjacent janitor office/storage area east of the multipurpose room. VU3 is a 6,400 cfm unit that supplies air to the multipurpose room. The fan unit was installed in the original 1963 construction. Fan casing and filters are dirty.

VU4 is a cabinet fan air handling unit with return fan and supply fan with filters, heating coil, and fan sections. Fan unit is located in a fan room above the stage storage area. VU4 is 1,800 cfm unit that supplies air to the Library room. Relief air exits through a roof cap. The fan unit was installed in the 1977 addition construction. Fan casing and filters are dirty.



EF1 exhausts air from south wing classrooms and office spaces the 1963 construction. Fan is an utilty type exhaust fan (5,600 cfm) located in the fan room with VU1. The fan unit was installed in the original 1963 construction. Fan casing and shaft are dirty.

EF2 is a cabinet type exhaust fan that serves the east wing clasrroms. EF2 is a 5,610 CFM fan unit. EF2 is located in the east wing fan room along with VU2. The fan unit was installed in the original 1963 construction. Fan casing and filters are dirty.

EF3 is an utility type exhaust fan located in the fan room with VU3. EF3 returns and exhausts air from the multipurpose room. EF3 is a 6,400 cfm fan. The fan unit was installed in the original 1963 construction. Fan casing and shaft are dirty.

EF4 is a utility type fan (1200 cfm) located in the South wing fan room and exhausts air from the south wing toilet rooms and administration toilet rooms. EF5 (500 cfm) is a utility type fan (1200 cfm) located in the East Wing fan room and exhausts air from the East wing toilet rooms. The fan units were installed in the original 1963 construction. Fan casings and shafts are dirty. Spot measurements indicate that air volumes are approximately 60% of design volumes.

The two toilet rooms for the Kindergarden classrooms, located at the end of the south wing, do not have exhaust fans. An exhaust grille is located in each toilet room with ductwork to a separate relief air cap on the roof above.

RALLY Room, Counselers office next to RALLY, janitor office/storage off the multipurpose room, and the teacher’s work room have no ventilation being supplied to the rooms.

1963 Ventilation Equipment remaining life expectancy: 05 years 1977 Ventilation Equipment remaining life expectancy: 510 years



Deficiency

08231 Original 1963 Ventilation Systems are past their service life VU1 through VU3 fan systems with corresponding return/exhaust fans EF1 through EF5 are all difficult to access and clean. Fans have reached the end of their service life. Equipment casings, filters, and ductwork are dirty.

Deficiency category: RR, EM, F.



Remedy Remove existing fan systems and install new ventilation equipment for these four systems including supply fans, exhaust/return fans, dampers, associated ductwork in Fan Rooms and controls. Recommend increasing the capacity of the ventilation systems for a modern level of air change (79 minutes). Note this modification will impact ventilation ductwork and grille sizes.




Deficiency

08232 1977 Ventilation System past its service life VU4 fan system with corresponding return/exhaust fans are reaching the end of their service life. Equipment casings, filters, and ductwork are very dirty.

Deficiency category: RR, EM, F.

Remedy Remove existing fan systems and install new ventilation equipment including supply fans, exhaust/return fans, dampers, associated ductwork in Fan Rooms and controls. Clean ductwork.




Deficiency

08233 Rally work room No ventilation in occupied area of building. This is a code violation.

Deficiency category: C (IMC 502.1.3)

Remedy Install supply and exhaust grilles to supply ventilation air to space. Connect to fan units for adjacent areas. Seal ductwork and provide balancing means.

Estimated Construction Cost: $4,300.



Deficiency

08234 Rally room ventilation No ventilation in occupied area of building. This is a code violation.






Deficiency

08235 Janitors Areas Lack of Exhaust Ventilation The office/storage next to multipurpose room ventilation does not have ventilation or exhaust. The two fan rooms used as Janitors Rooms do not have any exhaust ventilation. This is a code violation.


Remedy Install supply and exhaust grilles to supply ventilation and exhaust air to space. Connect to fan units for adjacent areas. Seal ductwork and provide balancing means.



June 2005 Glacier Valley Elementary School Condition Survey Report 8 of 178

Deficiency

No picture

08236 Teachers Workroom Ventilation No ventilation in occupied area of building. This is a code violation.






Deficiency

08237 Kindergarten Toilet Rooms No Mechanical Exhaust The two toilet rooms do not have mechanical exhaust but have gravity relief of air. Connect fan to control system for operation.

Deficiency category: RR, C (IMC, CBJ Title 19).

Remedy Install a roof mounted exhaust fan on one of the openings and install ductwork from both grilles to the new fan.




0824 Ventilation Distribution – Ducts, insulation, diffusers, dampers, etc.

Ductwork is observed to be rectangular galvanized steel. Diffusers are a combination of steel wall grilles and lay in type architectural diffusers. Most supply air ductwork is not insulated in the 1963 original construction and the 1977 Construction. Outside air intakes are insulated with board type duct insulation. Some of this insulation is falling off or missing.

Ductwork is in good condition. However, ductwork is dirty on the inside throughout the building and needs to be cleaned. Grilles and diffusers are in good condition. However, through out the building grilles and diffusers are dirty and need to be cleaned. Duct insulation is in good condition.

Remaining life expectancy: 10+ years



Deficiency

08241 Dirty ductwork, grilles, and diffusers Ductwork interiors, grilles, and diffusers for the entire facility are dirty and need to be cleaned.


Remedy Clean all supply air ductwork, exhaust air ductwork, return air ductwork, louvers, grilles, and diffusers.

Estimated Construction Cost: $ 58,000



Deficiency

08242 Administration Area Restricted Ventilation The adminstariton area that includes the main office the Principals office and the Nurses area do not have adequate ventilation. During spot measurements this area did not have any ventilation air being supplied which is an IMC code violation. Apparently in the past the above diffusers have been blocked and manual duct dampers have been closed due to excessive drafts and/or noise problems. Nurses area is only supplied ventilation, exhaust air is taken from adjacent areas. Diffusers have not been relocated along with room layout changes in the past and therefore have a poor distribution. Diffusers have been blocked in an attempt to lessen drafts.

Deficiency category: F, C (IMC Table 403.3)

Remedy The ventilation ductwork, diffusers and grilles needs to be revised for a better layout to the area, and exhaust grilles and ductwork need to be installed for the Nurses area.




Deficiency

08243 Outside Air Louver Too Close to Openings into the Building The outside air louver is located adjacent to an operable window allowing for interior air to be introduced into the ventilation system.


Remedy Replace window with an inoperable type.

Estimated Construction Cost: $ 2,900



0828 Controls – Heating and ventilation controls

Building automatic controls are a pneumatic/electric hybrid controls with some controls of equipment being done by direct digital controls, such as scheduling of equipment operation and immersion thermostats. Most controls for fan system dampers and thermostatic operations through out the building are still pneumatically operated. Control pneumatic air compressor and air dryer are located in the boiler room. DDC control panels are located in boiler room and fan rooms. Room thermostat, automatic valve, and damper actuators are generally pneumatic with all other controls having been changed over to DDC.

Remaining life expectancy: 510 years

Deficiency

No Photo Provided

08281 Pneumatic controls are antiquated and past their service life. DDC systems originally installed need to be upgraded to a modern DDC system currently used by school district.

Deficiency category: RR, F

Remedy Complete upgrade of heating and ventilation controls to facility wide direct digital controls compatible with district wide control system.

Estimated Construction Cost: $340,000

mechanical inspection â€“ heating & ventilation

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