Heat Controller HTD SERIES, HTH SERIES, HTV SERIES manual Two Stage Geothermal Heat Pump Systems

Heat Controller, Inc. HTV/HTD/HTH SERIES Engineering Design Guide

Two Stage Geothermal Heat Pump Systems

Features of the Two Stage HT Series

The HT Series Geothermal Heat Pumps are some of the most efficient and innovative geothermal units on the market today. Packed with features, they offer the best value to the homeowner who is interested in quiet comfort and low operating costs as a result of extraordinary efficiencies.

Technically, the HT Series are state-of-the-art with digital electronic controls, multi-stage scroll compressors, computer controlled fan motors, zero ozone depleting refrigerant, and much more.

Design Features

•Five capacities to meet all application requirements—two, three, four and six ton models.

•Efficient operation from 20°F to 120°F entering water tempera- tures. Flow rates may be as low as 1.6 gpm/ton.

•Top supply air discharge accommodates upflow applications.

•Select left or right hand return air positions for all models; cabinets include a deluxe filter rack/duct collar.

•Variable speed ECM blower motor adjusts to multiple duct system applications and provides soft start for added comfort and quiet operation.

•Narrow cabinet design can be easily moved through doorways.

•Internally trapped condensate piping (on all vertical units) allows easy, compact installation.

•Internal electric heat unit (optional) is designed for easy field installation.

•Electric box is positioned for easy field wiring from two sides.

•Loop pump power block is built with circuit breaker.

•Coaxial low temperature protection can be selected in the field for well or closed loop installations.

•Air coil low temp. protection utilizes high accuracy thermistors.

•Coaxial heat exchanger, refrigerant suction lines, hot water generator coil, and all water pipes are fully insulated to reduce condensation in low temperature conditions.

•Isolation mounted compressors and low RPM blowers are used to reduce noise; compressor compartment and interior cabinet are insulated with 1/2" coated glass fiber insulation.

•Double isolated compressor delivers extra quiet operation.

•Safety features include: high pressure and loss of charge pro- tection for the compressor; condensate overflow protection; low temperature protection sensors to safeguard the coaxial heat exchanger and air coil; hot water high-limit hot water genera- tor pump shutdown; fault lockout that enables emergency heat and prevents compressor operation until thermostat or circuit breaker has been reset.

Operating Efficiencies

•AHRI/ASHRAE/ISO 13256-1 ratings for heating COPs and cooling EERs are industry leaders.

•Hot water generator (HWG) with internal pump generates hot water at dramatic savings while improving system performance.

•Efficient scroll compressors provide quiet, reliable operation.

•Oversized coaxial tube water-to-refrigerant heat exchanger delivers high efficiency and extra heating capacity; convoluted water tube functions efficiently at low flow rates and provides resistance to freeze damage.

•Oversized rifled copper tube/lanced aluminum fin air-to-refriger- ant heat exchanger offers high efficiencies at low air velocity.

•Large, low RPM blower is both quiet and efficient, and provides high static capability.

Service Advantages

•Three removable access panels for the compressor compartment and one or two (depends on model) for the air handler compart- ment offer quick access to all internal components even with ductwork in place, making the unit service-friendly.

•Built with bi-directional thermal expansion valve.

•Brass, swivel water connections make it easy to connect loop and hot water piping.

•Insulated divider and separate air handling/compressor access panels allow service testing without air bypass.

•Design allows in-place service in tight installation spaces.

•CXM control features LED status light with memory feature for easy diagnostics.

•Control box and fan motors have quick-attach wiring connections for fast removal/reconnection.

•Biflow liquid line filter drier is factory-installed.

•75 VA control transformer comes with circuit breaker.

•Internal drop-out blower assemblymakes servicing simple.

•Refrigerant circuit includes high and low pressure service ports.

•E-coated refrigerant-to-air coil helps protect the coil from corrosion and extends life expectancy.

Factory Quality

•All units are built using our state-of-the-art manufacturing system that is designed to assure quality of the highest standards. This system:

-Verifies that the correct components are being assembled; -Automatically performs special leak tests on all joints; -Conducts pressure tests;

-Performs a highly detailed run test;

-Automatically prevents a "failed" unit from being packaged for   shipment;

-Creates a computer database of run tests for future service   analysis and diagnostics;

-Includes painting heavy gauge steel cabinets with durable epoxy   for  a long-lasting finish;

-Performs all refrigerant brazing in a nitrogen-rich environment;

-Evacuates units to a deep vacuum of less than 50 microns     prior  to  refrigerant charging

-Halogen leak tests all joints to ensure a leak rate of less

 than 1/4 ounce per year.

Options & Accessories

•Optional internal auxiliary electric heat.

•Electronic auto-changeover thermostats with indicator LEDs.

•Closed loop flow controller and hose kits.

See Geo Accessories brochure for complete list of accessories.

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