Manual 2100-537
I
Page 43 of 54
FIGURE 20
COIL SPACER
GENERAL – GTADP COIL SECTIONS
GENERAL (GTADP Add-On Coils)
These instructions are intended as a general guide and do not
supersede the coil manufacturer’s installation instructions
or local codes in any way. Read the manufacturer’s
installation manual and all “WARNING” statements
prior to installing the evaporator coil.
The following is needed, in addition to the evaporator coil.
1. Line Set Stub Kit with Single Pair Ends – Bard Part
No. GTLS-SK2-1
2. Line Set consisting of 7/8" and 3/8" soft rolled copper
with insulation.
3. Coil Spacer (Oil Furnaces Only)
Coils are shipped with a 10 PSIG dry air holding charge.
Puncture rubber plug on suction line to release charge
before removing plugs. The absence of pressure does not
verify a leak. Check the coil for leaks prior to installing if a
leak is suspected.
Position the coil/box directly on top of a gas furnace and
secure using sheet metal screws. The drain pans are made
of a polymer that can withstand temperatures up to 450˚F.
If installed on an oil or drum type heat exchanger (a coil
spacer is recommended to) maintain a 6 inch clearance
to protect the pan and to provide optimum air ow over
the coil. Coil should be level, or pitched slightly toward the
drain connections. See Figure 20.
LINE SET INSTALLATION (GTADP Add-On Coils)
Braze up one end of the line set to the GTLS-SK2-1 stub kit
and the other end to the evaporator coil. Ports are provided
in the GTLS-SK2-1 kit. Pull a vacuum (100 microns) on
the line set and coil. Pre-charge the line set and coil with
refrigerant before screwing the refrigerant ttings onto the
pre-charged condenser section.
REFRIGERANT CHARGE QUANTITY – Line Set
and Evaporator Coil (GTADP Add-On Coils)
The refrigerant charge shown on the GTC condenser section
is based on being matched with a GTA coil section and
not the ADP “A” coil. Charge adjustments are required
for proper system operation when using an ADP coil. Use
the following formulas to determine the amount of charge
required.
• GTC36 Line Set Charge = Line Set Length (FT) X 1.4
oz. R-410A/FT – 3.0 oz.
• GTC48 Line Set Charge = Line Set Length (FT) X 1.4
oz. R-410A/FT – 9.0 oz.
• GTC60 Line Set Charge = Line Set Length (FT) X 1.4
oz. R-410A/FT + 20.0 oz.
Example:
A GTC48 condenser section is being installed with a
GTADP-4860-C evaporator coil and a 25 foot line set.
GTC48 Line Set Charge = Line Set Length 25 (FT) X
1.4 oz. R-410A/FT – 9.0 oz.
GTC48 Line Set Charge = 26.0 oz.
DO NOT CONNECT THE LINE SET TO THE
CONDENSER SECTION
Pre-charge the line set and evaporator coil with the amount
of R-410A calculated earlier.
REFRIGERANT FITTING ATTACHMENT (After
pre-charging line set & coil) (GTADP Add-On Coils)
1. Coat all mating surfaces, including o-rings, with
R-410A refrigerant oil (Polyol Ester).
2. Attach female ttings to condensing unit portion by
hand-threading initially. Be careful not to cross-
thread assembly.
3. Final torque should be achieved. Use the appropriate
size wrench in conjunction with a second (backing)
wrench to ensure that the ttings do not spin or twist
on the copper refrigerant lines. Use the following
torque rates:
3/8" Line Set: 22-25 ft. lbs. (30-35 Nm)
7/8" Line Set: 44-47 ft. lbs. (60-65 Nm)
REFRIGERANT CHARGE
COIL SPACER
(IF REQUIRED)
ATTACH WITH
SCREWS TO
FLANGE
MIS-3127
