Questions and Answers.docx

Questions and Answers

1. Is there going to be a scheduled site visit for this project? Yes, See Amendment 0001

2. Do you know what the engineer's estimate is for this project? Not applicable to the solicitation.

3. Can you please confirm if this is for an air-cooled or water-cooled chiller? Air Cooled

4. Will the EMS control contractor work for integration of the new chiller need to be included in the contractor’s price?

The VA will have our contractor who services our BAS integrate the unit into our system

5. Will additional glycol need to be included in the bid and if so what quantity should be added in gallons and concentration?

There is no glycol. This is a back up chiller that switches over from the chiller plant which doesn’t run glycol.

6. Is there an estimated time of completion that you are looking at? The reason that I am asking is that manufactures have extensive build times for ordered equipment but it is sometimes possible to secure a machine that is scheduled for production but not yet sold.(Will an earlier lead time help to secure the bid) I cannot say whether that will help secure the bid. We would like to have the unit replaced as soon as possible.

7. Is there a target efficiency minimum required?

The same as the one being removed.

8. Is it required to drain the existing unit on site or can it be done off site?

Draining the residual chilled water can be done on site. Because it is a self-contained unit the refrigerant can be removed IAW regulations off site if that is easier.

9. Water conditions – Entering and Leaving water temperature requirements (54F / 44F?)

Our chiller plant provides 42F water so the Leaving water temp must be 42F or lower.

10. This is an air-cooled chiller that I assume will be required to run year-round (In the winter) and therefore will/probably requires Glycol in the water to prevent freezing during ambient conditions below 32F, What type (I would assume Propylene Glycol) and what concentration ( I would suggest 35-40% PG) is currently being used or will be used. I would not recommend using fresh water as it will freeze if you experience loss of power for an extended amount of time during freezing ambient conditions (Murphy’s Law).

Because this is a back up chiller that cross connects with our Chiller Plant there is no glycol. We will use a heat trace and sensor connected to our BAS in order to prevent freezing, as well as draining the unit in the winter when it will not be needed.

11. Is the chiller being replaced a Nominal 250-ton machine or are you looking for 250 actual tons of capacity based on the design operating conditions? High percentage Glycol solution will derate the chiller performance.

There is no glycol in the system. The unit being replaced is a back up to the chiller plant and is cross connected making the use of glycol impossible. Manufacturers calculate the nominal tonnage differently. 250 tons of capacity is what we are looking for.