HTP MODCON1000 User Manual

37
LP- 428 REV. 9.2.14
Under no circumstances should the mechanical room ever be under negative pressure. Particular care should be taken where exhaust
fans, attic fans, clothes dryers, compressors, air handling units, etc., may take away air from the unit. Failure to follow these instructions
could result in property damage or personal injury.
Combustion air supply must be completely free of any flammable vapors that may ignite, or chemical fumes which may be corrosive to
the boiler. See Table 1 for a list of combustion air contaminants. These chemicals, when burned, form acids which quickly attack the
stainless steel heat exchanger, headers, flue connectors, and the vent system. The result is improper combustion and premature boiler
failure. Such failure IS NOT covered under warranty.
EXHAUST FANS: Any fan or appliance which exhausts air from the mechanical room may deplete the combustion air supply and/or
cause a downdraft in the venting system. Spillage of flue products from the venting system into an occupied living space can cause a
very hazardous condition that must be corrected immediately.
MINIMUM RECOMMENDED COMBUSTION AIR SUPPLY TO MECHANICAL ROOM
MODEL
FIGURE 17
FIGURE 18
FIGURE 19
FIGURE 20
*Outside Air from 2 Openings
Directly from Outdoors
1
*Outside Air from 2 Ducts
Delivered from Outdoors
1
Inside Air from 2 Ducts Delivered from Interior
Space
2
*Outside Air
from 1
Opening
Directly from
Outdoors, in
2
1
Same Story
Different
Stories
Top Opening,
in
2
Bottom
Opening, in
2
Top Opening,
in
2
Bottom
Opening, in
2
Top Opening,
in
2
Bottom
Opening, in
2
Total
Opening, in
2
MODCON1000
250
250
500
500
1000
1000
2000
335
MODCON1700
425
425
850
850
1700
1700
3400
570
Table 9 – Indoor Combustion Air Sizing
The above requirements are for the boiler only; additional gas fired appliances in the mechanical room will require an increase in the net free area and/or
volume to supply adequate combustion air for all appliances.
No combustion air openings are needed when the boiler is installed in a space with
a volume NO LESS than 50 cubic feet per 1,000 BTU/hr of all installed gas fired
appliances. Buildings MUST NOT be of *”Tight Construction”.
1
Outside air openings shall communicate with the outdoors.
2
Combined interior space must be 50 cubic feet per 1,000 BTU/hr input. Buildings
MUST NOT be of *”Tight Construction”.
PART 6 – GAS PIPING
A. GAS CONNECTION
The gas supply shall have a maximum inlet pressure of less than 14" w.c.
(3.5 kPa), and a minimum of 3.5" w.c. (.87 kPa). The entire piping system,
gas meter and regulator must be sized properly to prevent pressure drop
greater than 0.5" (.12 kPa) as stated in the National Fuel Gas Code. This
information is listed on the rating label.
FAILURE TO FOLLOW ALL PRECAUTIONS IN THIS SECTION
COULD RESULT IN FIRE, EXPLOSION, OR DEATH!
It is very important that you are connected to the type of gas noted on
the rating plate. “LP” for liquefied petroleum, propane gas, or “NAT”
for natural or city gas. Prior to turning the gas on, all gas connections
must be approved by the local gas supplier or utility, in addition to the
governing authority.
A gas conversion kit comes with Mod Con 1000 boilers ONLY. Field
conversions ARE NOT ALLOWED on the Mod Con 1700. A properly
calibrated combustion analyzer must be used to verify proper
combustion. Failure to follow all above information could result in
property damage, serious injury, or death.
Figure 21 – Gas Connection Detail

HTP MODCON1000 Specifications

General

Brand	HTP
Model	MODCON1000
Category	Boiler
Language	English