Melfort Hospital

Lighting
The following table provides descriptions of the existing and proposed lighting conditions for different areas of the facility.

DDC Control & Related Upgrades
The DDC controls will be upgraded and sequences revised to improve the management of ventilation to the facility. Several fan systems having separate hot deck / cold deck coils have the reset temperatures set too high for hot deck and too cold for cold deck. An improved reset schedule will be implemented. Space temperature sensors will be installed in key location to provide space temperature feedback from which the temperature reset schedule will be adjusted as well as in relation to outside air temperature and/or return air temperature.

Zone control dampers will also be installed in key areas so that ventilation can be shut off to these areas when not occupied, while the fan system continues to serve other areas that remain occupied. Override control will be installed in key locations to allow staff to resume ventilation to an area if necessary for work than may occur during periods outside the normal schedule.

Prior attempts to schedule fans off in certain areas had not been successful since the present system does not have override control that the staff can use to resume ventilation. Schedules will be implemented on a few fan systems and with new override control installed the staff can resume ventilation when required. Existing schedules will remain or be slightly adjusted to suit the occupancy schedules.
Detail for individual fan systems is given below.

F-1 & F-3 Fan Schedule and Temperature Reset
Fans F-1 and F-3 respectively serving the 1984 ground floor and basement areas will be placed on a schedule so that both fans will operate from 05:30 to 22:00 all 7 days per week. Override control will be installed on each floor for staff to resume operation of the fan if required. The temperature reset control will be revised to better manage space temperature and outside air volume.

For the single duct unit F-3 the mixed air temperature will be reset with the day / night supply air temperature to maintain 18% outside air. Mixed air temperature for fan F-1 will track the CD temperature but will also be reset to maintain at least a minimum of 18% outside air. Also for fan F-1 the HD / CD reset will be changed as shown in the following:

Cold deck temperature set lower than 12.C causes cold draft discomfort, excessive reheating, and poor air mixing within the zones. In winter, cold deck temperature set lower than 18C also results in excessive outside air and reheating. This 18C setpoint will be tuned as may be required to properly serve areas with higher internal heat gains. It is most efficient to maintain HD and CD temperatures as close as possible to being equal to each.

Basement Heat Reclaim Re-commissioning
The basement heat reclaim system is not being properly controlled and the outside air preheating coil is being continuously bypassed.
As part of the DDC control upgrade, a new 2-way flow control (normally open) will be installed at the pump outlet to improve management of heat reclaim performance. A loop temperature sensor will be installed to monitor temperature of glycol exiting from the outside air preheat coil, prior to entering the existing 3-way valve. New control sequences will be programmed to regulate the fluid flow rate via the new 2-way flow control as well as the existing 3-way bypass valve, in response to various new and existing temperature sensors. Existing exhaust coils will be cleaned and drain pans flushed to ensure no blockages. Filters will be installed where necessary.

The penthouse heat reclaim system will be further investigated during measure implementation. Blocked coils will need to be cleaned or removed. The coil associated with the kitchen hood exhaust likely requires removal. Without reclaim from the kitchen exhaust it is unlikely feasible for this system to be re-commissioned due to limited heat reclaim potential in remaining coils.

SF-25 (Labs) Schedule + Pushbutton Override
A schedule will be implemented to operate this fan from 07:00 to 19:00 weekdays only. A push button control will be installed within the Lab space to provide override control for 3 hour resumed fan operation. Additionally one or more space temperature sensors will be installed to cycle the fan on for space cooling if the space temperature limit is exceeded. Interlocks to EF.26, EF.27, and EF-A will be retained.

SF-6 (72-wing System 19) Schedule & Zone Isolation
A schedule will be implemented to operate this fan from 06:00 to 22:00 weekdays and 08:00 to 18:00 weekends. A push button control will be installed at a suitable location within the diagnostics area for staff to resume fan operation if required for weekend or night call situations. Interlocks to the kitchen exhaust fans will be retained. Push button control will be installed also in the kitchen area that will start the kitchen exhaust fan, and also SF-6 if it is not already operating.

An existing bypass damper that allows additional outside air to enter the return fan when the kitchen exhaust fan is running, will remain closed at all times. As an alternate method of control, variable speed drives will be installed to control the System 19 fans along with zone control dampers to control airflow in certain zones as described below.

A VSD (variable speed drive control) will be installed for each of the supply and return fans for this system. Zone dampers will be installed in the following locations:

• outlet of mixing box B15 to kitchen
• outlet of mixing box B16 to kitchen (no damper for cafeteria B17)
• outlet of mixing box B18 to boardroom
• return air 34 x 14 from kitchen
• return air 24 x 20 from boardroom / cafeteria / IT

The new dampers listed above will be scheduled to close at 6:00pm. Space temperature sensors will be installed in key IT areas, and an override pushbutton control will be installed in the basement corridor as well as in diagnostics area noted above. Dampers will reopen for a 2-hour period when their associated override button is used. The fan system will resume ventilation in response to the pushbutton override or if temperature limit is exceeded in the key spaces monitored.

At the start of each occupied period, the fans will start at 85% speed. When the kitchen fan is started, the supply fan will increase to 100% and the kitchen return damper will close. Minimum outside air will be increased from 20% to 30%. At 6:00.pm the kitchen exhaust fan will be shut off, the kitchen supply and return dampers will close, outside air will be reduced to 20%, and the fans will reduce to 60% speed for the remainder of the schedule unless the kitchen override is used.

SF-30 ( 60'wing ) CO2 control
The existing schedule for this fan as controlled by the DCC will be retained: 06:00 to 20:00 weekdays and 08:00 to 12:00 Saturday. Additionally new CO2 control will be installed to regulate the outside air volume in relation to the space occupancy. The OA damper will maintain 18% OA minimum, and will otherwise open more as required. The CO2 sensor will be installed in the AHU after the fan so that the blended mixed air is supplied with CO2 not higher than 750.ppm.

The hot deck / cold deck temperature reset schedule will also be revised as shown below:

RTU - 60'wing Top Floor
These fans are presently operating 24/7. A new schedule will be implemented to have the fans operated from 06:00 to 20:00.hrs weekdays. Outside the scheduled period the outside air dampers will remain closed however the fans will operate intermittently in response to existing space temperature control to ensure space heating or cooling is maintained. A push button override will be installed to initiate a 3.hour period of continuous fan operation with fresh air damper economizers enabled during this period.

RTU - ambulatory
Control for the rooftop unit serving the ambulatory area will remain generally unchanged except a minor change to the cold deck reset is proposed for better energy management.
Existing Reset Schedule:

• cooling demand 100% HD = 20C CD = 12C
• cooling demand 50% HD = 20C CD = 15C
• cooling demand 0% HD = 30C CD = 15C ( revised to HD=28C CD=18C )
• SF11 (1st floor) zone isolation & VSD

Presently this fan runs 24/7 serves areas on the first floor including surgery recovery beds, offices, corridors, and scrub area. Almost 50% of the area served is a former acute care area that has been vacant for many years.

Zone isolation dampers will be installed to shut off supply and return airflow to the vacant areas. Variable speed drives will be installed on the fans. The fans will operate at 50% speed with the vacant areas shut down. Temperature sensors installed a couple areas within the space will ensure the temperature does not range to far extreme high or low and an air purge will be scheduled for 30 minutes per day.

The fan will otherwise be scheduled to operate only between 05:00 and 22:00.hrs on weekdays only. A pushbutton override will be installed in the nursing area to allow extended operation if required. The hot deck and cold deck temperature reset schedule will be configured similar to what is proposed for other fans.

SF-13 CO2 Control (Second Floor)
This multi-zone fan operates continuously serving all of second floor ward areas. A CO2 control will be installed on the return air to ensure sufficient outside air is being supplied to the floor. The outside air will be otherwise maintained at a minimum of 20%. Existing cold deck setpoints presently cause outside air to be in excess at 35% or more. The hot deck & cold deck reset schedule will be revised for better space temperature and ventilation management. Much energy is otherwise wasted for reheating.

SF-15 ( O.R. ) standby mode control
Ventilation mode control will be re-commissioned for this fan system. During implementation it will be determined whether scavenger exhaust is used within the operating rooms. If scavenger exhaust is used, the outside air damper will be set to supply 6 ACH of outside air when the operating room is "in-use", and will reduce to 10% outside air to maintain space pressurization when the room is in "Standby". If no scavenger exhaust is in place, the fan will supply 100% outside air when the operating room is "in-use". The fan will continue to run 24/7 as is recommended by CSA.317.2 Healthcare Ventilation Standard.

Pushbutton control will be installed at the nursing station with occupancy control in each operating room. Training will be provided to the staff for using the mode control. When it is intended to use the operating room, the pushbutton will initiate "in-use" mode, or otherwise if occupancy is detected in excess of 3 minutes, the "in-use" mode will be initiated. The system will change to "standby mode" after 30 minutes of no occupancy being detected.

SF-17 (day surgery) schedule + pushbutton override
A new day / night schedule will operate this fan continuously during the day schedule and cycle the fan on/off at night & weekends to maintain unoccupied space temperature since the surgery area relies on the fan for heating. A pushbutton override will skip 1 day/night schedule and extend continuous operation of the fan to the next day/night cycle. A DDC temperature sensor will be installed within the day surgery room. This is a single duct fan system. The supply air temperature will be set to reset appropriately with outside air temperature and feedback from the new space temperature sensor. The fan will cycle to maintain temperature set back to 18C at night if the override is not used while outside air dampers remain fully closed. The outside air damper will be set to 20% minimum outside air for the daytime schedule, 6:00 to 18:00 weekdays.

MUA-1 Changes
The boiler room make-up air unit supplies both the boiler room and a former incinerator room now used for storage. Combustion air to the boiler room is supplied by this fan and by via the boiler room relief opening. Excess air supplied by this fan to the boiler room escapes through the relief opening. It is the objective of this measure to minimize this excess.

The make-up air fan will be reshived to match the supply air volume with the needs of the combustion equipment existing within the boiler room and also for any new equipment that may be installed. The supply air to the incinerator room will be reduced if appropriate or will otherwise continue to transfer to the boiler room and be counted within the total supplied to the boiler room.

The return air damper for this fan will be controlled by boiler room temperature and a sensor will be installed if none existing. The return damper will normally remain full open and will begin to close proportionally if the boiler room temperature exceeds the upper limit setpoint. The heating coil will be controlled to maintain supply air at least 55F, and otherwise maintain the room temperature above the low limit setpoint. Outside air will also remain full open as there is no existing outside air damper.

Higher boiler room temperature increases the efficiency of the combustion appliances, however it must be kept in check to allow ambient cooling of motors on fans and pumps. The boiler room upper a lower temperature limit setpoints will be reset as follows:

Boiler Retrofit (steam to hot water)
Much of the building heating is distributed by hot water or glycol to perimeter heating and to fan coils respectively. These loops are heated via steam exchangers. This load can be more efficiently supplied by hot water boilers rather than steam since hot water boilers operate at lower temperatures and have much lower flue gas temperatures and stack losses.

The existing fire tube steam heating boiler is near the end of its life and will be replaced with a set of hot water heating boilers, improving both efficiency and reliability. The new boilers will be forced draft modulating hot water heating boilers operating at low pressure. The flue gas stack will be modified to suit the new boilers. Each will be supplied with an independent boiler circulation pump configured to circulate hot water within a primary loop.
The existing hot water perimeter heating loop will be supplied with hot water from the new primary loop with the returning water controlled with a new 3-way control valve.

The HX-7A glycol loop feeding AHU coils will also be heated via the new hot water loop with a suitable heat exchanger and controls.
Steam supplied to existing perimeter radiation as well as the 1960 wing glycol exchanger will remain in place served by existing smaller two steam boilers. Heating system redundancy is detailed in the measure regarding Boiler Replacement for System Redundancy.

Boiler Replacement for System Redundancy
The smaller of the 3 existing low pressure steam boilers has gone down with cracks in the cast sections. Without this boiler in service the hospital does not have sufficient redundant capacity to maintain heating if the largest boiler experiences problems. This issue is addressed in part by implementing the steam to hot water retrofit measure. However the remaining steam system now requires repair to maintain redundancy to the steam supply.
A new HPS steam boiler will be installed to replace the failed LPS boiler. This will provide redundancy to the high pressure steam system for sterilization which presently has no redundancy. Additionally a pressure reducing valve will be installed for the new boiler to be connected as backup to the existing low pressure steam header for redundancy to the building heating system.

During implementation, this measure will go through final design where it will be determined how best to install redundancy for both the steam heating and hot water heating systems. Boiler sizing will be determined depending on the method of system redundancy. The hot water & glycol system redundancy will be either established within the new hot water boiler capacity, or be provided within the capacity of the new HPS boiler feeding the existing LPS header and steam heat exchangers.

Water Fixture Retrofits
Overview
Treated water is a carefully manufactured product, which appears in the facilities only after traveling through many miles of pipeline and lengthy treatment process. It’s a vulnerable resource that shouldn’t be wasted. Water savings can be realized through a variety of methods including low flow toilets as well as sink faucet moderators.

Scope
Water Matrix recommends that 71 toilets be upgraded to low flow models, 1 urinal be upgraded to a low flow model and 71 sink faucets be fitted with low flow aerators.

Vending Machine Control
Overview
Cold beverages are available for purchase at this site from a pair of refrigerated beverage dispensing machine. It has self contained refrigeration and illumination that are currently running constantly, regardless of whether people are in the area to purchase beverages.

Scope
Vending Miser controls will be implemented on refrigerated vending machines within the facility. They will be wall mounted and plugged into the receptacle providing power to the existing vending machines, and the vending machines will then be plugged into the Vending Miser receptacle. It can be relocated with the vending machines.

A passive infra-red sensor detects occupants and allows the machine to power down when the surrounding area is vacant. The device also monitors room temperature and vending machine compressor operation to automatically re-power the cooling system at one to three hour intervals to ensure that drinks remain cool.

Savings result because the machine lighting is only on when the area is occupied, and the compressor does not short cycle, which increases the efficiency and life span of the compressor.

Building Envelope Sealing
Overview
An investigation to upgrade the current conditions of the building envelope was conducted by CANAM Building Envelope Specialist. The results of this investigation have uncovered several areas where the building envelope can be upgraded in order to reduce heating costs. Most of the areas where improvements may be made within the confines of the performance contract involve low cost sealing of identified cracks around doorways.

Scope
The scope of work detailed by CANAM is as follows:

Doors

• · Weather-strip 15 exterior doors.
• · Roof access door included.
• · W/S 1 interior door to isolate ambulance bay.
• · W/S 4 interior mechanical room doors.

Overhead doors

• · Replace existing worn and damaged weather-stripping with new.
• · 2 – 12’ x 10’ (bottoms are okay)
• · 2 – 10’ x 8’

Roof/wall

• · Seal 120’ of roof/wall in ambulance bay.

Penthouse

• · Seal 3 penetrations into elevator shaft.

Roof

• · W/S roof access hatch onto original section roof.
• · Inspect and seal as needed 5 roof top exhaust fans.

Backflow Prevention
Overview
Backflow occurs when the water flows in the opposite direction from its normal flow. The cause of a backflow is a change in pressures. This reversed direction of water flow may allow contaminants to enter the drinking water system through cross-connections. Backflow Prevention is a strategy whereby a valve is placed in the domestic water supply line of a given facility in order to prevent contamination by pollutants due to ‘backflow’ in the system. Examples of testable backflow preventers used for medium to high hazard processes include: reduced-pressure principle assemblies, double-check valve assemblies and pressure vacuum breaker assemblies.

Scope
Backflow Prevention double-check valve assemblies will be installed in both the domestic and fire pump water supply pipes in order to comply with the 1995 National Building Code part 7.6.2.3 and CSA.Z317.1 Canadian Standards Association Special Requirements for Plumbing Installations in Health Care Facilities, Section 6.3.3.5.