Comfort-Aire HTS Series Split System,Two Stage, 2-5 Tons - Manual (Page 6)

6
Installation, Operation & Maintenance HTS SERIES SPLIT SYSTEM Heat Controller, LLC
Equipment Selection
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
Rows
Dimensions
N
2
14 x 17
N
2
24 x 17
N
2
24 x 17
N
3
24 x 17
Cabinet Confi guration Upfl ow/Downfl ow/Horizontal (Multipoise)
WDG Series Fan Motor Type - HP ECM - 1/2 ECM - 1/2 ECM - 1 ECM - 1
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 effi ciency.
Using an older-model coil can affect effi ciency and may not
provide the customer with rated or advertised EER and COP.
Coil design and technology have dramatically improved
operating effi ciency and capacity in the past 20 years.
Homeowners using an older coil are not reaping these cost
savings and comfort benefi ts. NEVER MATCH AN R-22
INDOOR COIL WITH AN R-410A COMPRESSOR SECTION.
Newer indoor coils have a larger surface area, enhanced fi n
design, and grooved tubing. These features provide a larger
area for heat transfer, improving effi ciency 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 specifi c 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 specifi cations 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 fi xed orifi ces 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
airfl ow, supply air temperatures may not be acceptable if the
compressor is allowed to change stages when used with a
PSC fan motor.
Table 1b: WDG Air Handler Characteristics for Brands other than Above Models
Model* Nominal Tons*
Evaporator
Temp (ºF)
CFM
Capacity
(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.