RFIs Received 2- 631-19-002 Steam Phase II - 4-14-2026.pdf

RE: Upgrade Steam Distribution Phase 2

RFI-001

We are currently reviewing the project plans and specifications to develop project costs. During this review, we identified gaps in the HVAC and DDC scope within the documents that will need to be addressed by the design team. An initial list of identified items is outlined below. These issues need to be resolved so the scope is clearly defined and we can continue developing the project costs accurately.

1. M301 detail 1, 2, 3, & 4 seem to indicate that for all pneumatic applications the units need to be upgraded to DDC electronic components. These details also show a remote thermostat for radiator valve: wired.

Example detail from M301

However the general new work notes on the MP series drawings seem to indicate the cast iron radiators and fin tube radiators shall have a thermostatic radiator valve.

Example from 01-MP103

Please identify exactly what Finned Tube Radiators, Cast Iron Radiators, Convectors, Unit Heaters, & steam heating coils shall be provided with DDC Electronic components and devices?

⚫ Page 2

VA Response:

This RFI response is to confirm IN GENERAL the intention is for DDC for all loads. The Pneumatic controls and system once in place are beyond economical use, therefore there shall be no pneumatic devices called for.

See attached scanned new work plan drawing set for highlighting loads and guidance to assist with cost estimation. The controls intention for each room or area is labeled as OEC (occupied end-user controls), OP - Occupied Public (i.e. readout only), U/TEC for utility (a stairwell unit heater) – no read out, just a probe and economical controls such as on/off.

The intention will be distribution of local PSHA500s to support the T-stats and controls selected. See page 3.

Preference for OEC/OP spaces shall be modulating controls for greater stability and comfort. These low voltage supply panels shall be mounted above ceiling or mechanical spaces identified. They shall be located within 100 feet of the low voltage device. The summary below assumes 1 PSH to every 20 devices. Field controller selection and quantification to be DDC supplier responsibility with the assistance of the new work scans of this RFI. Equipment branch line voltage is often available from abandoned loads or within 75 feet and rarely greater than 150 of PSH placements.

Requirements for selected Tstat chosen shall be Digital read out, ability for end-user to increase or decrease setpoint over a remotely settable range (OEC areas), BACnet capable. VA believes based on Primary, TEC3000 would support this but there may be more economic offerings including non-OEM.

The following is a summary of low pressure ~ 5psi loads (FTR, UH [VUH, UH, CUH], CIR, FCU, etc.). It does not include new domestic water heaters, AHU, MAU, RHC, Humidifier, HX, Condensate alarms, or other DDC loads which are identified on the attached scans. Exact low voltage and field controller layouts shall be provided by contractor in shop drawings for means and methods.

Contractor is responsible for providing a complete and functional system.

Total

OEC OP U/TEC PSH500

Thermostats 168 43 26

Control Valves 247 60 32 42 Bldg. 1 Summary

Thermostats 103 11 14

Control Valves 150 11 14 24

Bldg. 4 Summary

Thermostats 23 11 3 0

Control Valves 44 12 3 5

Bldg. 5 Summary

Thermostats 19 6 6

Control Valves 25 10 9 5

Bldg. 8 Summary

Thermostats 19 7 2

Control Valves 20 11 2 3

Bldg. 9 Summary

Thermostats 0 3 0

Control Valves 0 7 0 2

Bldg. 15/16 Summary

Thermostats 4 5 1

Control Valves 8 9 4 3

⚫ Page 3

RFI-002

2. Some pages on the MP series drawings include a “keyed new work note” describing the new work for the associated piece of equipment.

Example from 01-MP114

Some pages on the MP series drawings include a note stating “NO WORK” which would indicate no scope for the respective piece of equipment.

Example from 01-MP113

However some pages in the MP series drawings show equipment which does not include a KEYED NEW WORK NOTE or a note stating “NO WORK”.

Example from 01-MP111

⚫ Page 4

Please confirm scope on these pieces of equipment that are missing notes. Are these pieces of equipment intended to receive new control valves etc? The following list is not an exhaustive review and there may be additional equipment that require review.

• Page: 01-MP104, Equipment: UH ETR

• Page: 01-MP111, Equipment: H ETR, & HX ETR

• Page: 01-MP117 detail 2, Equipment: CP ETR

• Page: 04-MP104, Equipment: CIR ETR, & AHU ETR and condensate pump in BS4

• Page: 04-MP102, Equipment: CIR ETR, & FTR ETR

• Page: 04-MP103, Equipment: CIR ETR, & FTR ETR

• Page: 05-MP101, Equipment: CIR ETR, & FTR ETR

• Page: 05-MP102, Equipment: CIR ETR, & FTR ETR

• Page: 08-MP101 detail 4, Equipment: FTR ETR -

• Page: 08-MP101 detail 1, Equipment: Duct Coils

• Page: 08-MP101 detail 3, Equipment: FTR ETR

VA Response:

• Page: 01-MP104, Equipment: UH ETR – Controls to be DDC

• Page: 01-MP111, Equipment: H ETR, & HX ETR – No DDC scope

• Page: 01-MP117 detail 2, Equipment: CP ETR – Provide high level alarm

• Page: 04-MP104, Equipment: CIR ETR, & AHU ETR and condensate pump in BS4 - No DDC scope

• Page: 04-MP102, Equipment: CIR ETR, & FTR ETR – See markup

• Page: 04-MP103, Equipment: CIR ETR, & FTR ETR– See markup

• Page: 05-MP101, Equipment: CIR ETR, & FTR ETR– See markup

• Page: 05-MP102, Equipment: CIR ETR, & FTR ETR– See markup

• Page: 08-MP101 detail 4, Equipment: FTR ETR – See markup

• Page: 08-MP101 detail 1, Equipment: Duct Coils - No DDC scope

• Page: 08-MP101 detail 3, Equipment: FTR ETR – See markup

⚫ Page 5

RFI-003

1. M301 detail 4 would indicate the unit heaters are to be provided with DDC control. However M401 schedule note 1 and 15/16-MP101 keyed new work note 9 would indicate the unit heaters are to be provided with line voltage package controls (non DDC controls). Please advise level of control for unit heaters.

Example from M301

Example from M401

⚫ Page 6

Example from 15/16-MP101

VA Response: See response to RFI 1 and marked-up drawings.

⚫ Page 7

RFI-004

1. 01-MP115 keyed new work note 2 does not call for a new steam control valve. Please confirm existing steam control valve to remain.

Example from 01-MP115

VA Response: Replace existing steam control valve.

2. 08-MP101 keyed new work note 7 does not call for a new steam control valve. Please confirm duct coil existing steam control valve to remain.

Example from 08-MP1101

VA Response: Duct coil existing steam control valve to remain.

RFI-005

1. 01-MP104 and 01-MP117 does not include a keyed new work note calling for an high level float alarm on the ETR condensate pump. Please confirm if alarm is needed.

VA Response: See marked-up drawings – provide high level float alarm for all ETR CP.