VA
Existing Conditions
*
* Heating, Cooling, and Ventilation Systems
The areas of the building excluding the apparatus bay are served by air handling units HVAC-1 and
HVAC-2. HVAC-1 has a capacity of 5,545 CFM with a hydronic heating coil rated for 162 MBH at 8.1
GPM flow rate with a AT of 40°F and a DX coil rated for 154.5 MBH Total Cooling Capacity and 94.4
MBH Sensible Cooling Capacity served by the exterior condensing unit CU-1. HVAC-2 has a capacity
of 4,805 CFM with a hydronic heating coil rated for 333.5 MBH at 16.6 GPM flow rate with a AT of
40°F and a DX coil rated for 125.9 MBH Total Cooling Capacity and 113.2 MBH Sensible Cooling
Capacity served by the exterior condensing unit CU-2. Both units are 208 Volt, 3 Phase, and 60 Hz.
The existing condensing units CU-1 and CU-2 are located on grade at the rear of the building. Both
units are 208V, 3 Phase, 60 Hz. The piping is run within a PVC pipe down below prade and extends
into the mechanical room to connect to the DX coil in the air handling units.
The system is reaching end of life and while functional its cooling capacity has been declining and is
currently not sufficient for cooling the building.
* Automatic Temperature Controi (ATC) System
The existing ATC system is a 1998 vintage jCl Metasys controi system and is currently functional.
The existing system utilizes MCM controllers which are no longer supported and the user interface
and control points are not able to be revised or upgraded. The existing front-end coniroller will
require replacement but the existing field controllers should be reusable with an upgraded front
end.
* Domestic Hot Water Plant
The existing domestic hot water plant currently consists of a Lochinvar CFNOSOOPM gas fired
instantaneous water heater (500 MBH input, 515 GPH at 100°F rise} serving four 119-gallon hot
water storage tanks of which only two are currently operational. The system at its current age is
reaching its end of life and sourcing parts are becoming difficult.
2
66 Jackson St, Littleton, NH 03561 | 40 So. River Rd #35, Bedford, NH 03110 ; Ph: 603.444 6578 | www yeatonasseciates com
