FMC5X, FMC5Z: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
Refrigerant Charge and Room Area Limitations
In UL/CSA 60335-2-40, R-454B refrigerant is classified as class A2L,
which is mildly flammable.Therefore, R-454B refrigerant is suitable for
systems needing additional refrigerant charge and which will limit the
space of the rooms being served by the system.
Similarly, the total amount of refrigerant in the system shall be less than
or equal to the allowable maximum refrigerant charge. The allowable
maximum refrigerant charge depends on the space of the rooms being
served by the system.
NOTE: The nouns in the table are explained as follows:
– Mc: the actual refrigerant charge in the system.
– A: the actual room area where the appliance is installed.
– Amin: the required minimum room area.
– Mmax: the allowable refrigerant charge in a room.
– Qmin: the minimum circulation airflow.
– Anvmin: The minimum opening area for connected rooms.
Room Area Calculation Requirements
NOTE: The space considered shall be any space which contains
refrigerant-containing parts or into which refrigerant could be released.
The room area (A) of the smallest, enclosed, occupied space shall be
used in the determination of the refrigerant quantity limits.
For determination of room area (A) when used to calculate the
refrigerant charge limit, the following shall apply. The room area (A)
shall be defined as the room area enclosed by the projection to the base
of the walls, partitions and doors of the space in which the appliance is
installed. Spaces connected by only drop ceilings, ductwork, or similar
connections shall not be considered a single space. Units mounted higher
than 71" (1.8m) and spaces divided by partition walls that are no higher
than 63" (1.6m) shall be considered a single space. Rooms on the same
floor and connected by an open passageway between the spaces can be
considered a single room when determining compliance to Amin, if the
passageway complies with all of the following.
1. It is a permanent opening.
2. It extends to the floor.
3. It is intended for people to walk through.
The area of the connected rooms, on the same floor, connected by
permanent opening in the walls and/or doors between occupied spaces,
including gaps between the wall and the floor, can be considered a single
room when determining compliance to Amin, provided all of the
following conditions are met as Fig. 4.
1. Low level opening
a. The opening shall not be less than Anvmin in Table 4.
b. The area of any openings above 11-3/16" (300mm) from the
floor shall not be considered in determining compliance with
Anvmin.
c. At least 50% of the opening area of Anvmin shall be below
7-7/8" (200mm) from the floor.
d. The bottom of the opening is not more than 100mm from the
floor.
e. The opening is a permanent opening that cannot be closed.
f. For openings extending to the floor the height shall not be less
than 7-7/8" (200mm) above the surface of the floor covering.
2. High level opening
a. The opening shall not be less than 50% of Anvmin in Table 4.
b. The opening is a permanent opening that cannot be closed.
c. The opening shall be at least 59" (1.5m) above the floor.
d. The height of the opening is not less than 20 mm.
3. Room size requirement
a. The room into which refrigerant can leak, plus the connected
adjacent room(s) shall have a total area not less than Amin. Amin
shown in Table 7 or Table 9 under different conditions.
b. The room area in which the unit is installed shall be not less than
20% Amin. Amin is shown in Table 7 or Table 9 under different
conditions.
NOTE: The requirement for the second opening can be met by drop
ceilings, ventilation ducts, or similar arrangements that provide an
airflow path between the connected rooms.
A240025
Fig. 1 – Opening Conditions for Connected Rooms
For appliances serving one or more rooms with an air duct system, the
room area calculation shall be determined based on the total area of the
conditioned space (TA) connected by ducts taking into consideration that
the circulating airflow distributed to all the rooms by the appliance
integral indoor fan will mix and dilute the leaking refrigerant before
entering any room.
EXPLOSION HAZARD
Failure to follow this warning could result in death, serious personal
injury, and/or property damage.
Never use air or gases containing oxygen for leak testing or operating
refrigerant compressors. Pressurized mixtures of air or gases containing
oxygen can lead to an explosion.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts.
Table 1 – Minimum Opening Area for Connected Rooms
AMcMmaxAnvmin
ft
2
m
2
lb-oz kg lb-oz kg ft
2
m
2
100 11 17-3 7.8 6-10 0.3 1.3 0.14
110 12 17-3 7.8 7-5 3.3 1.2 0.13
120 13 17-3 7.8 8-0 3.6 1.1 0.12
130 14 17-3 7.8 8-10 3.9 1.0 0.11
140 16 17-3 7.8 9-5 4.2 1.0 0.11
150 17 17-3 7.8 10-0 4.5 0.9 0.10
160 18 17-3 7.8 10-10 4.8 0.8 0.09
%
RI$QYPLQ
PP
PP
P
(
PP
PP
PP
$QYPLQ
%
RI$QYPLQ
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