Specifications

Page 68 of 76 SmartSource 2-Stage Water Source Heat Pumps Catalog 1114-1
Engineering Guide Specications
Units shall have a factory-installed, 4-sided, 1" duct ange on the discharge of the blower to allow connection of eld duct-
work and must have a minimum of two access panels, one for the compressor compartment and one for the blower compart-
ment. Unit shall have an insulated panel separating the blower compartment from the compressor compartment. Units are to
ship with heavy metal brackets, rubber isolators, fasteners and washers to suspend and isolate the unit from the building.
Cabinets shall have separate openings and knockouts for entrance of line voltage and low voltage control wiring. Supply and
return water connections shall be FPT ttings and shall be securely mounted ush to the cabinet corner post allowing for con-
nection to a exible hose without the use of a back-up wrench.
It is the installing contractor’s responsibility to provide sufcient clearance so that units can be easily removed for servicing.
Drain pan
Unit shall utilize corrosion resistant closed-cell insulated stainless steel drain pans. A stub out connection shall be provided.
The drain pan shall be designed to ensure no pooling of condensate water per ASHRAE 62.2. The unit will be supplied with
solid-state electronic condensate overow protection as standard. Mechanical oat switches will not be accepted.
Filter Rack and Filters
Unit shall come standard with a 2-inch disposable lter and a 2-inch, 4-sided factory-installed combination lter rack/return
air duct collar. The lters shall be removable from either side of the unit.
As selectable options, unit shall have a 2-inch thick MERV 8 OR 4 inch MERV 13 lter, factory-installed with a 2-inch or 4-
inch factory-installed combination lter rack/return air duct collar.
All lter racks shall be gasketed between the lter rack and the unit cabinet along with a gasket on the tool-less removable
door to achieve a leakage rate of less than 4 CFM per square foot of lter area at .5" ESP. The rack shall be 4-sided with door
and duct collar.
Refrigerant Circuit
Units shall have a sealed refrigerant circuit, which includes a non-CFC depleting R-410A refrigerant [rotary (sizes 007-019),
and scroll compressor (sizes 024 to 070)]. In addition, each unit will have a thermostatic expansion valve, an aluminum n
and ried copper tube refrigerant-to-air heat exchanger, a reversing valve and a water-to-refrigerant coaxial heat exchanger.
The coaxial coils shall be made of [copper] [or optional cupronickel] and shall be deeply uted to enhance heat transfer and
minimize fouling and scaling. The coaxial coil shall have a working pressure of 400 psig on the waterside of the unit and 500
psig on the refrigerant side for all R-410A units.
The compressor shall have a dual level vibration isolation system. The compressor will be mounted on vibration isolation
grommets to a heavy gauge compressor mounting plate, which is then isolated from the cabinet base with rubber grommets to
minimize vibration transfer. Compressor shall have thermal overload protection. Compressor shall be located in an insulated
compartment away from air stream to minimize sound transmission.
Refrigerant metering shall be regulated by a thermostatic expansion valve (TXV) only. Reversing valve shall be four-way
solenoid activated refrigerant valve, which fails in the cooling “dominant” operation. Safety controls include a high-pressure
switch, a low-pressure switch (sizes 019 to 070 only) and a low refrigerant temperature sensor. Refrigerant gauge access
ttings shall be factory-installed on high and low pressure refrigerant lines to facilitate eld service. Activation of any safety
switch shall prevent the compressor from operating.
Evaporator coils shall be supplied with an optional corrosion resistant e-coated epoxy coating that must pass a ASTM B-117
1000-hour salt spray test to provide protection against corrosion due to acids, solvents, and salt found in the environment.
Electric Heat Coils
The optional 5, 10, 15, or 20 kW electric heat coil shall be factory-installed inside the unit cabinet, be integral to the supply
fan housing and be used as boilerless, supplemental, primary, or emergency heat. 15 and 20 kW heaters shall be 2-stage.
Desuperheater
The optional desuperheater shall be factory-installed in the compressor compartment and used to add supplemental heating,
using superheated refrigerant gas through a tube-in-tube heat exchanger to the domestic hot water supply. Water lines shall be
fastened to the exterior panel with ush mounted brass NPT ttings.
• Factory-Installed Option: The desuperheater pump shall be factory-installed inside the unit. (Voltage 208-230/60/1 and
208-230/60/3 only)