Product data

21
UNIT MOUNTING (INDOOR)
Mounting Bracket – The fan coil units are furnished with
mounting brackets or dedicated mounting holes to hang the unit.
Support – Adequate support must be provided to handle the
weight of all fan coils. Refer to the Physical Data section for
weights, and the base unit dimensional drawings.
Unit Leveling – For reliable operation, units should be level in all
planes.
Clearances – Minimum clearance as shown in Fig. 14--15.
Unit location – Select a location which provides the best air
circulation for the room. These units should be positioned as high
as possible to provide adequate air circulation. The unit return and
discharge should not be obstructed by furniture, curtains, or
anything which may cause the unit to short cycle or air to recycle.
UNIT MOUNTING (OUTDOOR)
Support – A location which can bear the weight of outdoor unit.
Refer to the Physical Data section for weights, and base
dimensional drawings.
Unit Leveling – For reliable operation, units should be level in all
planes.
Clearances – Minimum clearances, as shown in Fig. 15, must be
provided for airflow. The outdoor units are designed for free--blow
applications. Air inlets and outlets should not be restricted.
Unit location – A location which is convenient to installation and
not exposed to strong wind.
SYSTEM OPERATING CONDITIONS
Cooling operating range:
OPERATING RANGE (Min / Max ° F (° C))
Cooling Heating
Outdoor DB ---4 / 122 ( ---20 / 50) ---4 / 86 (---20 / 30)
Indoor DB 63 / 90 (17 / 32) 32 / 86 (0 / 30)
Indoor WB 59 / 84 (15 / 29)
Heating operating range:
NON --- OPERATING TEMPERATURE RANGE (Min / Max ° F (° C))
Indoor/Outdoor DB 32 / 86 (0 / 30)
METERING DEVICES
The outdoor unit has multiple electronic expansion valves to
manage the refrigerant flow to the different indoor fan coils
connected to that unit.
REFRIGERANT LINES
General Guidelines:
1. The outdoor units are shipped with a full charge of R --410A
refrigerant. All charges, line sizing, and capacities are based
on runs of 25 ft. (7.6 m). For runs over 25 ft. (7.6m),
consult long--line section on this page for proper charge
adjustments.
2. Refrige rant li ne s should not be buri ed in the ground. If it is
neces sar y to bury the line s, do not bury more than 36 inches
(914 mm). Provi de a mi nimum of 6 inc h ( 152 mm) ver tic al
rise t o the se rvic e valves to pre vent re fri gera nt migr ation.
3. Both lines must be insulated. Use a minimum of ½-- i n c h
(12.7 mm) thick insulation. Closed--cell insulation is
recommended in all long-- line applications.
4. Special consideration should be given to isolating the
interconnecting tubing from the building structure. Isolate
the tubing so vibration or noise does not transmit into the
structure.
Long Line Applications:
S No change in line sizing is required.
UNIT
SIZE
ZONES
CHARGE
oz. (kg.)
ADDITIONAL
CHARGE
REQUIRED
AFTER FT. (m)
ADDITIONAL
CHARGE
oz./ft. (g/m)
TOTAL
MAX.
PIPING
LENGTH
FT. (m.)
18 2
67.02
(1.9)
49 (15) 0.16 (15) 98 (30)
27 3
98.76
(2.8)
74 (22.5) 0.16 (15) 147 (45)
36 4
126.98
(3.6)
98 (30) 0.16 (15) 196 (60)
48 5
162.26
(4.6)
123 (37.5) 0.16 (15) 245 (75)
NOTE: Additional Refrigerant Calculation Sum Total Liquid Pipe
ft. (m) Additional Charge Required After ft. (m.) x Additional
Charge oz./ft. (g/m) 0.16 (15).
NOTE: If the calculation results in a negative number , no
additional refrigerant is required.
DRAIN CONNECTIONS
Install drains that meet the local sanitation codes. If adequate
gravity drainage cannot be provided, a field installed condensate
pump accessory should be used. Refer to the condensate pump
Installation Instructions for detailed specifications.
NOTE: Condensate Pump is built-- in on Ducted and Cassette
indoor units.
NOTE: The high wall fan coils have an internal condensate
trap therefore an external trap is not required.
WIRING
The main power is supplied to the outdoor unit. Four field supplied
connecting cables from the outdoor unit to each of the indoor units
are: L1, L2, Ground, and S for communication between the
outdoor unit and each indoor unit.
CONTROL SYSTEM
The 38MGQ/40MAQ/ 40M B unit is e qui pped wi th a mi croproces sor
control t o operat e the s ys tem and give opti mum levels of c om f ort
and operat ing efficie ncy . Ther e ar e mic roproc ess or boards and
thermi stor s locate d in both the indoor and outdoor unit s. The
thermi stor s monit or the s ystem operation a nd control the oper ati ng
mode . To cha nge the s ettings or the modes of operation, use the
fact ory supplie d wirel ess r emote control.
The 38MGQ/40MAQ/40MB unit has the following operating
modes:
S Fan Only
S Auto
S Heating (on Heat Pumps only)
S Cooling
S Dehumidification (Dry)
FAN ONLY -- In Fan Only mode, the system filters and circulates
the room air without changing the room air temperature.
AUTO -- In Auto mode, the system automatically selects one of the
following operating modes: COOLING, HEATING or FAN
ONLY based on the difference between the room temperature and
the set point temperature.
HEATING -- I n t h e HEATING mode, the system heats and filters
room air.
COOLING -- W h e n i n COOLING mode, the fan runs all the time
and the system cools, dries and filters room air .
DEHUMIDIFICATION (DRY) -- In Dehumidification (Dry)
mode, the system dries, filters and slightly cools room temperature.
This mode does not take place of a dehumidifier.
In addition to the above modes that are selected by using the
remote control, the unit can run in emergency mode by using the
manual button. This mode is used when the remote is misplaced or
the batteries in the remote have died. In this mode, the unit runs in
AUTO mode with a predetermined set point (76_F/24.4_C).