VERTICAL STACK INNKEEPER GUIDE SPECIFICATION CGC Hybrid Heat Pump System

Transcription

1 VERTICAL STACK INNKEEPER GUIDE SPECIFICATION CGC Hybrid Heat Pump System PART 1 SYSTEM DESCRIPTION 1.1 The HVAC system is based on the CGC HYBRID Hydronic Heat Pump System. 1.2 The system will automatically provide the availability of heating or cooling functions 24 hours a day, 365 days a year without need for a changeover. The system is designed to function with 85 F supply hydronic fluid temperature when ambient conditions is 55 F and above, and be elevated at a rate of approximately 1 F for each 2 F drop in ambient. The units/chassis shall be designed to provide heating without the use of the compressor. The fluid temperature rate of change will be adjusted during commissioning to best follow the building heating requirements. 1.3 Designer shall select system type as either a) Constant Flow System, or b) Variable Flow System. a) Each unit shall be equipped with valve arrangement to allow for a constant flow system. OR b) Each unit shall be equipped with valve arrangement capable of shutting off fluid flow during periods of no call. Units shall also include an automatic flow limiting device so as to maintain the specified fluid flow during operating periods. 1.4 Model selections and performance shall be in accordance with the schedule on the drawings. 1.5 Each unit/chassis shall be pressure tested on both the refrigerant and fluid (water) circuits followed by a helium leak detection program for both circuits. Each unit shall be run tested for a minimum of 30 minutes and all control functions shall be checked out. Individual units/chassis shall be self contained and complete when shipped from the factory. 1.6 Alternate proposals shall include consideration for equipment space requirements, pipe and equipment sizing, electrical installation impact, operating costs, sound implications and redesign fees. 1.7 Units shall be safety certified and bear a seal of approval from one of UL/ULc/ETL or ESA. 1.8 Manufacturer shall warrant the parts of each unit for a period of 1 year. 1.9 Commissioning of the CGC unit(s) shall be performed by a CGC trained technician. A commissioning report shall be provided by the commissioning technician for review and approval by the owner s representative. PART 2 MECHANICAL PARTS 2.1 Cabinet The Cabinet shall be fabricated with 16 gauge base and 18 gauge galvanized steel with all Interior of cabinet lined with 1/2 neoprene backed acoustic insulation shipped as one complete enclosure The supply air openings shall be pre punched to allow easy field selection of available discharge arrangements The front panel shall provide acoustic dampening, front return air and access to facilitate normal unit maintenance and service.

2 2.1.4 The front panel shall be constructed of 18 gauge galvanized steel with factory powder coat baked enamel finish The bottom return air boot accessory shall allow open return air to enter at floor level, shall cover flooring material, and lock chassis in place. Boot shall be constructed of galvanized steel with factory powder coat baked enamel finish The Surface mounted front panel shall be designed to cover opening of unit cabinet and fastened with 4 point slip lock connection allowing easy access and installation of chassis All refrigeration components shall be accessible through the front access panel The Cabinet shall be designed for direct application of dry wall and shall include dry wall stops and cabinet flanges to avoid penetration of dry wall screws into cabinet interior The Cabinet shall include leveling legs and contractor shall ensure unit cabinet is plumb prior to application of dry wall An OPTIONAL baffle shall be installed behind each grille mounted at the unit to attenuate fan noise and provide blocking of sight and sound between adjacent rooms The Cabinet shall ship in enclosed truck to avoid insulation getting wet in transit, tarps not recommended. 2.2 Chassis The chassis fabrication shall be of properly sized and framed galvanized steel construction The chassis shall be complete with refrigeration circuit, hydronic circuit, blower assembly and controls with internal stainless steel condensate drain pan with P trap condensate drain The chassis control access panel shall be easily removable to provide access to controls and shall include a window to view standard control board LED status lights without requiring removal of the access panel The Chassis shall be fabricated with an insulated partition between blower and compressor compartments to minimize compressor sound transmission The Service panel shall be easily removable and sufficiently large to allow access to all components. Contractor shall verify location of service panels and assure access The chassis shall be completely removable by disconnecting steel braided supply and return hoses, condensate hose, thermostat terminal block and line voltage plug in power connection The chassis shall be complete with braided stainless steel covered flexible hoses rated at 300psi. A clear reinforced condensate hose/trap shall be provided with the chassis The Plug connection shall provide positive disconnect of main power to chassis. The junction box with receptacle shall be factory supplied within cabinet The contractor shall ensure chassis including complete operating system, blower and controls are removable with adequate service and access clearance.

3 2.3 Risers (Optional) The supply and return risers shall be type L copper. Condensate riser only type M copper Risers to be each supplied with factory swaged expanded top end to accept risers from unit above and to minimize field brazing The supply and return risers shall be factory supplied with service isolation ball valve The risers shall be pre bundled with a metal channel for slip fit connection to left or right side of cabinet as indicated on the construction drawings The copper risers shall not make contact and be isolated from metal channel and cabinet with neoprene isolation The riser diameter shall be as shown on plans. Riser length and schedule shall be coordinated with mechanical contractor It is the responsibility of the supplier of the risers to provide a Riser Schedule indicating riser diameters, riser lengths, options, unit size, and location. 2.4 Blower and Motor The Blower shall be direct drive forward curved, external rotor motor at a speed below rpm to deliver CFM (m3/h) of air at 0.25 in WG (75 Pa) external static pressure The blower shall be statically and dynamically balanced The complete blower section including motor shall be easily accessible and removable for service The Blower motor shall be direct drive, single phase with integral thermal overload protection. 2.5 Filter The filter chamber shall be an integral part of the system, located on return air path and should be serviceable from the front of the unit The filter shall be standard capacity, one (1in) think polyester washable type shipped with the chassis. 2.6 Heating Loop The refrigerant circuit shall not operate in heating mode Heating coil shall be aluminum fin and copper tube construction rated to withstand 300 PSI working pressure. PART 3 REFRIGERATION PARTS

4 3.1 Refrigeration System The refrigeration circuit shall be available for operation on non ozone depleting R410a refrigerant The refrigeration circuit shall have the following components: Thermal Expansion Valve with external equalizer Refrigerant sight glass Filter dryer High pressure cut out High pressure service port Low pressure cut out Low pressure service port The service ports shall be located to facilitate field service with unit in place All refrigerant piping shall be of type ACR copper pipe The refrigerant circuit and components shall be factory assembled in a sealed, leak and performance tested, and properly charged system The sealed refrigerant circuit shall be certified for 600 PSIG working pressure. 3.2 Compressor The compressor shall be high efficiency sealed hermetic rotary compressor The compressor shall be externally isolated on rubber mounts and connected to refrigerant circuit with floating piping to minimize sound transmission The Compressor motor shall have integral thermal overload protection The compressor shall not operate in heating mode The Compressor shall be provided with a 5 minute restart delay to avoid compressor short cycling and low pressure lockout. 3.3 Direct Expansion Evaporator Coil The Refrigerant to air heat exchanger shall be aluminum fin and copper tube construction rated to withstand 600 PSI refrigerant working pressure The coil shall have a maximum face velocity of FPM (m/s) A stainless steel corrosion free condensate drain pan shall be provided under the coil. 3.4 Water Cooled Condenser Module

5 3.4.1 The condenser shall be high efficiency refrigerant to water heat exchanger of copper inner water tube, minimum ½ diameter and steel refrigerant outer shell design, rated to withstand 600 PSI refrigerant working pressure and 300 PSI water pressure The condenser shall be completed with the following item: Three way pressure actuated water valve (Two 2 way valves optional) Receiver The unit shall require USgpm (l/s) of condensing water at F (C) and have a maximum pressure drop of PSI (Pa). 3.5 Valves The unit shall come standard with 3 way water valves. OPTIONALLY Two 2 way valves. OPTIONALLY flow limiting valve. PART 4 CONTROL SYSTEM 4.1 System The unit shall be complete standard with microprocessor controlled electronic circuit board The Control panel shall be supplied with individual 24 VAC control transformer The control board shall have LED indicators displaying thermostat call, unit operation and Alarms The control board shall operate with: A 24 volt thermostat Onboard fuse protection The unit shall be supplied with 24VAC digital thermostat as follows: Standard Suite Thermostat: Electronic digital wall mounted 24V manual changeover type (MCO) with Heat, Cool, Off system selector switch and fan "On, Auto" selector switch. Optional Common / Commercial Area Thermostat: Electronic digital wall mounted 24V automatic changeover type (ACO) programmable with Auto, Heat, Cool, Off system selector switch and fan "On, Auto" selector switch. 4.2 Alarms The standard Control Panel shall have the following standard alarms: Low Coil Temperature High Leaving Water Temperature Low Discharge Air temperature Low Refrigerant Pressure High Refrigerant Pressure High Condensate Level