7
1.800.627.4499
Integral Indirect Gas-Fired Heat Module
OPTION
1.0 OVERVIEW
1.1 DESCRIPTION
The gas heater found in the RenewAIre DN unit is an indirect gas fired heat module, classified
as either Category I or Category III. Flue gas venting is either horizontal (through the wall)
or vertical (through the roof). Modules can be ordered in several different BTU inputs. All
modules produce a low pressure drop and are enclosed within a galvanized steel cabinet. The
temperature rise across the module is 20–60˚F [11.2–33.3˚C].
THESE HEAT MODULES COMPLY WITH ANSI Z83.8 AND CSA 2.6M GAS-FIRED HEAT MODULE
1.2 GAS SUPPLY
RenewAire gas-fired heat modules can be ordered with either natural gas or LP gas as a fuel
source, not to exceed pressure of 13.5 inches water Column (InWC) [3,359 Pa]. For all modules:
u
Natural gas supply
pressure must be a
minimum
of 5 InWC [1,244 Pa] and a
maximum
of
13.5 InWC [3,359 Pa].
u
Propane gas supply pressure
must be a
minimum
of 12 InWC [2,986 Pa] and a
maximum
of 13.5 InWC [3,359 Pa].
u
If gas pressure exceeds 13.5 InWC [3,359 Pa], an additional regulating valve must be field-
supplied and installed.
1.3 ELECTRICAL SUPPLY
The gas heat module is factory-wired and requires no additional field wiring. Line voltage
readings between L1 and Neutral as well as L1 and Ground should be /- 3 volts of the
voltage rating on the module data label, found on the front of the heat module.
1.4 INPUT CAPACITY IN MBH [W]
Gas module sizes are based upon the INPUT MBH (thousands of BTUs per hour) [Watts]. This
is a measure of heat energy available and is not to be confused with heat output, which is
affected by the efficiency of the module. Modules are available in the following input capacities:
u
50 MBH [14,653 W]
u
75 MBH [21,980 W]
u
100 MBH [29,307 W]
u
125 MBH [36,633 W]
u
150 MBH [43,960 W]
u
200 MBH [58,614 W]
u
250 MBH [73,267 W]
u
300 MBH [87,921 W]
u
350 MBH [102,574 W]
IMPORTANT
The gas module sizes shown above are rated for installation at altitudes up to 2,000 feet
[610 m]. Starting at altitudes above 2,000 feet [610 m], appliances should be de-rated 4
percent and another 4% for each 1,000 feet [305 m] of elevation above 2,000 feet. Example:
2000–2999 Ft = 4% de-rate
3000–3999 Ft = 8% de-rate
4000–4999 Ft = 12% de-rate
5000–5999 Ft = 16% de-rate
6000–6999 Ft = 20% de-rate
7000 Ft and above, consult factory
NOTE: This unit is
an integral indirect
gas-fired heat mod-
ule that will be referred
to in this manual as a
module.
NOTE: Within this
manual, U.S. units
of measure are
given first and then the
SI version is provided in
brackets [ ] immediately
after.
NOTE: All indirect
gas-fired heat
modules are 80%
efficient.
OVERVIEW
