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Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
05/2023 Rev.21
can be used for remote signalling in the event of a/c cutoff on low or high pressure limit.
Continuous fan operation:
For continuous indoor fan operation on single units, install a jumper between
terminals 8 and 3. For continuous indoor fan operation on dual units using the older LL357D4, install
jumper between 8 and 3 and remove jumper between 1 and 3.
CommStat 4 Lead /Lag Controller
Please refer to the Product Data sheet for the Commstat 4 controller for complete instructions
on installing and programming this controller.
CommStat 3 Controller
(See Figure 13c)
The CommStat 3 Controller is a solid state control package designed to operate a fully or
partially redundant air conditioning system for a telecommunication cabinet or shelter. The
CommStat 3 Controller is factory programmed with standard industry set points to facilitate installation.
If desired, each of the set points can be quickly and easily changed in the field by the installer. It can
be used with Marvair's unique vertical packaged wall mount air conditioners or other environmental
control units. See CommStat 3 Product Data Sheet for installation and programming instructions.
V
E
C
F
2
W
M
U
H
G
O
1
Y
M
O
C
C
N
T
U
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K
C
O
L
C
N
O
N
M
R
A
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A
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C
.
O
N
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C
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S
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A
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C R
2
Y
S
N
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I
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N
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A
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4
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3
7
1
5
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N
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C
T
A
T
S
I
D
I
M
U
H
-
E
D
Figure 6a. Humidistat Wiring to a Marvair Air Conditioner with Reheat.
R C
1
Y
B
/
O
1
W
2
W
2
Y G
1
S
2
S
N
O
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Q
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H
3
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-
7
0
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0
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D
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C
C
A
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H
C
A
V
4
2
V
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2
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C
C
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.
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C R
2
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N
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R
A
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A
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N
A
T
A
T
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R
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H
T
Figure 6b. Thermostat Connection Diagram