www.enviromaster.com
9
multi-zone Heat Pump Condensing units
The system will support refrigerant runs
to the inside unit of up to 100' equivalent
feet with a 35' rise included. The units
are furnished with sweat connections and
are equipped with refrigerant valves and
MultI-zonE HEAt PuMP rEfrIgErAnt PIPIng InStAllAtIon
Schrader fittings for charging and taking
pressure readings. The following precau-
tions should be made:
• Be certain no burrs remain on the
fittings.
• Use only clean refrigeration tubing.
• Use tube benders to guard against
kinking.
• Avoid piping on wet and rainy days
and
insulate suction line
. Be certain
that plastic end caps remain in place
when inserting through wall openings.
Isolate tubing from transmitting vibra-
tion to the building or unit and avoid
contact with sharp edges.
refrigera-
tion valves should be wrapped with
a wet rag "heat sink" to protect
valves while brazing.
inTerConneCTing TuBing SPeCS
S2HB, T2HB, T3HB, & T4HB models:
Nominal
Circuit
Capacity
Maximum
Length
Maximum
Lift
Liquid
Line
OD
Suction
Line
OD
9,000
100’
35’
1/4”
1/2”
12,000
100’
35’
1/4”
1/2”
18,000
100’
35’
3/8”
5/8”*
24,000
100’
35’
3/8”
3/4”
noTe: Refrigerant Piping Installation for all of the multi-zone heat pump models.
PiSTon/oriFiCe CHange KiT inSTallaTion
Air Handler
When a WLH24 or UNH24 air handler is matched with a T2HB or T3HB contain-
ing a 24,000 Btuh nominal capacity circuit, the air handler must have it’s stock
piston changed from 0.059 to 0.063.
A 24,000 Btuh nominal circuit
can be identified by the “4” in
the model number capacity field (i.e.
T2HBx4xx). Refer to the instructions sup-
plied with kit part number; 240006777.
model #
air Handler
Condenser
Btuh
Factory installed
Piston/Orifice Size
Field Changeover
Piston/Orifice Size
WLH24
or
UNH24
T2HB2
400
T2HB8
400
T2HB
4400
T3HB99
40
T3HB92
40
T3HB22
40
.059”
.063”
Note:
T
his kit is only supplied with the above Heat Pump models.
* CAH24, UNH24, WLH24 Suction Connection size
is 3/4” O.D. and must bush down to 5/8” for 18,000
Btuh circuits at the indoor unit.
Circuit Designators: 9 = 9000 Btuh • 2 = 12000 Btuh • 8 = 18000 Btuh • 4 = 24000 Btuh
(ex. - 8400 consists of one 18000 Btuh compressor and one 24000 Btuh compressor)
