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Gas Furnace Design
If the 8th digit in the model number is a “G”, the rooftop unit
was furnished with a factory installed furnace (Example,
MPS035FG). The Maverick commercial rooftop units are
available with either the low heat input or the high heat input
). This packaged gas heat
rooftop unit is designed for outdoor non-residential installations
only.
The gas heat furnace design consists of a tubular heat
exchanger, in-shot burner manifold with gas valve, induced
combustion blower, gas heat DDC control module and all
operational safeties. The tubular heat exchanger can come
with the standard aluminized steel construction or the optional
stainless steel construction. The safety switches include a
high-limit temperature switch, an auxiliary high-limit switch,
a combustion blower proof of airflow, and the flame roll-out
switch (see
The high limit switch is an automatic reset switch and it opens
up at 160°F to shut the furnace down and closes at 130°F. The
auxiliary limit switch is a manual reset and opens up at 180°F
to shut the furnace down.
Figure 19: Gas Heat Section
Gas Heating Capacity Data
Table 15: MPS 015F – 050F Gas Heating Capacities
Data
Unit Size
015–020
026–035
040–050
Low Heat
High Heat
Low Heat
High Heat
Low Heat
High Heat
Heating Input (MBh)
240
480
300
600
400
800
Heating Output (MBh)
192
384
240
480
320
640
Steady State Efficiency
80%
80%
80%
80%
80%
80%
Number of Stages
2
4
2
4
2
4
Turndown
1
4:1
8:1
4:1
8:1
4:1
8:1
Minimum Airflow
2960
5920
3700
7400
4900
9800
Maximum Temperature Rise
60°F
100°F
60°F
85°F
60°F
85°F
Gas Main Pressure
Natural Gas (in. wc)
7-14
7-14
7-14
7-14
7-14
7-14
Liquid Propane (in. wc)
12-14
12-14
12-14
12-14
12-14
12-14
Manifold Pressure
Natural Gas (per gas valve)
Stage 1 (in. wc)
1 .2
1 .2
1 .2
1 .2
1 .2
1 .2
Stage 2 (in. wc)
3 .2
3 .2
3 .2
3 .2
3 .2
3 .2
Low fire
2
0 .4
0 .4
0 .4
0 .4
0 .4
0 .4
Propane
Stage 1 (in. wc)
2 .3
2 .3
2 .3
2 .3
2 .3
2 .3
Stage 2 (in. wc)
10 .0
10 .0
10 .0
10 .0
10 .0
10 .0
Low fire
2
N/A
Note:
1 Modulating gas heat only.
2 Modulating gas heat not available with propane.
Field Gas
Piping
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23
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
