Heat Controller HTS SERIES manual Equipment Selection, General, Indoor Coil Selection HTS GeoLogix

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A

R e v. : 0 3 A u g u s t , 2 0 1 2

Equipment Selection

NOTICE! AHRI matched systems are required for warranty and applicable federal tax credits.

The installation of geothermal heat pump units and all associated components, parts, and accessories which make up the installation shall be in accordance with the regulations of ALL authorities having jurisdiction and MUST conform to all applicable codes. It is the responsibility of the installing contractor to determine and comply with ALL applicable codes and regulations.

General

Proper indoor coil selection is critical to system efficiency. Using an older-model coil can affect efficiency and may not provide the customer with rated or advertised EER and COP. Coil design and technology have dramatically improved operating efficiency and capacity in the past 20 years. Homeowners using an older coil are not reaping these cost savings and comfort benefits. NEVER MATCH AN R-22

INDOOR COIL WITH AN R-410A COMPRESSOR SECTION.

Newer indoor coils have a larger surface area, enhanced fin design, and grooved tubing. These features provide a larger area for heat transfer, improving efficiency and expanding capacity. Typical older coils may only have one-third to one- half the face area of these redesigned coils.

Indoor Coil Selection - HTS GeoLogix®

HCI split system heat pumps are rated in the AHRI directory with a specific indoor coil match. GeoLogix® (HTS) models are rated with Heat Controller WDG Series air handlers and MWG Series coils as shown in Table 1a. Other brands of air handlers may attain the same AHRI ratings providing that the specifications meet or exceed those listed in Table 1a AND Table 1b. However, for warranty and federal tax credits, an AHRI matched system is required. An ECM motor and TXV is required. Cap tubes and fixed orifices are not acceptable. PSC fans may be used if matched to Table 1b, but will not meet AHRI ratings. If using PSC fan, compressor section must be operated as a single stage unit (i.e. wired for either 1st stage or 2nd stage). Without the ability to vary the airflow, supply air temperatures may not be acceptable if the compressor is allowed to change stages when used with a PSC fan motor.

Table 1a: WDG/MWG Indoor Section Matches for AHRI Ratings

Compressor Section Model	024	036		048	060
Indoor Section Model	024	036		048	060
Refrigerant			HFC-410A
Metering Device		TXV (required)
Air Coil
Type	N	N		N	N
Rows	2	2		2	3
Dimensions	14 x 17	24 x 17		24 x 17	24 x 17
Cabinet Configuration		Upflow/Downflow/Horizontal (Multipoise)
WDG Series Fan Motor Type - HP	ECM - 1/2	ECM - 1/2		ECM - 1	ECM - 1

Table 1b: Tranquility® 27 Air Handler Characteristics for Brands other than Above Models

	Model*	Nominal Tons*	Evaporator	CFM	Capacity
			Temp (ºF)		(MBtuh)**
024	- Part Load	1.5	50	530	19.2 - 22.4
024	- Full Load	2.0	52	880	24.2 - 28.2
036	- Part Load	2.5	51	700	25.2 - 29.2
036	- Full Load	3.0	50	1200	34.5 - 40.1
048	- Part Load	3.5	47	1000	34.3 - 39.9
048	- Full Load	4.0	48	1650	46.3 - 53.8
060	- Full Load	5.0	48	1850	54.5 - 63.3

*Nominal tons are at AHRI/ISO 13256-1 GLHP conditions. Two-stage units may be operated in single-stage mode if desired, where smaller capacity is required. For example, a model 024 may be used as a 1-1/2 ton unit if “locked” into 1st stage operation only. If PSC fan is used, unit must be “locked” into either 1st or 2nd stage. An ECM fan is required for two-stage operation and for AHRI ratings. Size air handler for “Full Load” if operating in two-stage mode.

**When selecting an air handler based upon the above conditions, choose entering WB temperature of 67ºF. Use evaporator temperature, CFM and capacity requirements as listed above. The air handler capacity must be at least at the minimum capacity shown in the table in order for the AHRI rating condition to be valid. See Figure 1 for an example selection.

6 Heat Controller, Inc. Water-Source Heating and Cooling Systems