6
Marvair GAA A/C w/Gas Heat I&O Manual
06/2023 Rev.5
1.2 Model Identification
Example G
A
A
1
0
3
6
A
A
0
9
0
C
G
+
+
+
1
D
A
+
A
1
1
+
+
+
+
+
+
Position
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
1
Unit Designation/Family
G
= Marvair Wall Mount w/Gas Heat
2
Energy Efficiency Ratio (EER)
A
= 11
3
Refrigerant Type
A
= R-410a
4
Compressor Type/Quantity
1
= Single
5
Unit Capacity/Nominal
Cooling (BTUH)
024 = 24,000
042 = 42,000
030 = 30,000
048 = 48,000
036 = 36,000
060 = 60,000
6
7
8
System Type
A
= Air Conditioner
9
Power Supply
(Volts-Hz-Phase)
A
= 208/230-60-1
C
= 208/230-60-3
D
= 460-60-3
10
Heat Designation
@ Rated Voltage
KW
= Kilowatt
045
= 45,000 BTUH
090
= 90,000 BTUH
067
= 67,500 BTUH
100
= 100,000 BTUH
075
= 75,000 BTUH
125
= 125,000 BTUH
11
12
13
Ventilation
Configuration
C
= Economizer
D
= Motorized Damper w/Pressure Relief
E
= Motorized Damper w/Pressure Relief &
Independent Motorized Damper Control
F
= No Free Cooling, 100% Emergency
Ventilation Only w/Independent Control
H
= GreenWheel
N
= Barometric Damper
w/15% OSA
N
= Barometric Damper w/15% OSA
14
Dehumidification
G
= Hot Gas Reheat
H
= Hot Gas Reheat w/Humidity Control
J
= Hot Gas Reheat w/Return Air Limit
K
= Hot Gas Reheat w/Humidity Control &
Return Air Limit
M
= Modulating Hot Gas Reheat
N
= Modulating Hot Gas Reheat w/Humidity
Control
+
= None
15
Controls
A
= Power Fail Alarm w/Additional Lockouts
C
= 24V EMS Relay Kit
D
= 24V EMS Relay Kit
w/Factory Installed T-Stat
E
= Factory Installed T-Stat
+
= None
16
Operating Condition
A
= Evaporator Freeze Sensor (EFS)
N
= Hard Start
P
= Hard Start w/Low Ambient & CCH
Q
= Hard Start w/Low Ambient &
Fan Cycle Control (FCC)
R
= Crank Case Heater (CCH)
T
= Hard Start w/EFS
V
= Hard Start w/Low Ambient &
CCH & EFS
W
= Low Ambient w/CCH
Y
= Low Ambient w/CCH & FCC
Z
= Low Ambient w/CCH & EFS
1
= Low Ambient w/FCC
2
= Low Ambient w/FCC & EFS
+
= None
17
Indoor Air Quality
Features
D
= Dry Bulb Sensor
E
= Dry Bulb Sensor w/Dirty Filter
G
= Dirty Filter Sensor
+
= None
18
Air Flow
1
= Top Supply/Bottom Return
19
Compressor
Location
D
= Left Hand
E
= Right Hand
20
Filter Option
A
= 2” Pleated (MERV 8, AC/HP-C)
C
= 2” Charcoal
D
= MERV 11 High Filtration Package
E
= MERV 13 High Filtration Package
F
= Filter Access Through Return Air Grille
W
= Aluminum Washable
+
= None
21
Corrosion
Protection
A
= Condenser Coil Only
C
= Evaporator Coil Only
D
= Both Coils Condenser & Evaporator
E
= All Coils Cond/Evap/Reheat
F
= Coat All
K
= Coastal Package
+
= None
$
= Special
22
Engineering
Revision Level
A1
23
24
Cabinet Color
1
= Marvair Beige
2
= Gray
3
= Carlsbad Canyon
4
= White
5
= Stainless Steel Exterior
6
= Dark Bronze
8
= Mesa Tan
9
= Pebble Gray
A
= Stainless Steel - Unit
$
= Custom Color (Powder Coat)
25
Sound Attenuation
2
= Compressor Blanket
+
= None
26
Security Option
A
= Lockable Access Plate/Tamper Proof
+
= None
27
Fastener/Drain Pan
Option
A
= Stainless Steel Fasteners
C
= Stainless Steel Drain Pan
D
= Stainless Steel Fasteners & Drain Pan
+
= None
28
Unused
+
= None
$
= Special
29
Unused
+
= None
$
= Special
30
Special Variation
+
= None
$
= Special Configuration Not Covered by
Model Nomenclature
Note:
Not all options are available with all configurations. Contact
your Marvair sales representative for configuration details and
feature compatibility.
1.3 Serial Number Date Code
20 = 2020
01 = January
05 = May
09 = September
21 = 2021
02 = February
06 = June
10= October
22 = 2022
03= March
07 = July
11 = November
23 = 2023
04 = April
08 = August
12 = December
1.4 Cooling Mode
Marvair GAA air conditioners with gas heat use R410A refrigerant in a conventional vapor-compression
refrigeration cycle to transfer heat from air in an enclosed space to the outside. A double blower assembly
blows indoor air across the evaporator. Cold liquid refrigerant passing through the evaporator is boiled
into gas by heat removed from the air. The warmed refrigerant gas enters the compressor where its
temperature and pressure are increased. The hot refrigerant gas condenses to liquid as heat is transferred
to outdoor air drawn across the condenser by the condenser fan. Liquid refrigerant is metered into the
evaporator through capillary tubes to repeat the cycle.
