TEMPMASTER
74
FORM TPM3-EG1 (518)
e. Flue: The furnace flue shall be shipped loose to protect it from damage during
transit. The flue shall be field-mounted by the installing contractor. The flue out-
let shall be located above the unit to help prevent recycling of combustion gases
back through the heat exchanger.
f. Agency Certification: Gas heating sections are both ETL listed to both U.S.
and Canadian safety standards.
3. Modulating Gas Heat: The heating section shall include an induced draft furnace
in 24:1 modulation of heating capacity.
a. Heat Exchanger(s): The heat exchanger(s) shall be constructed of tubular alu-
minized steel [stainless steel] with stainless steel flue baffles and flue assembly.
b. Burner(s) and Ignition Control: The burner(s) shall include a direct-driven in-
duced-draft combustion fan with energy efficient intermittent pilot spark ignition,
redundant main gas valves with pressure regulator.
c. Combustion Air Fan(s): The inducer fan(s) shall maintain a positive flow of
air through each tube to expel the flue gas and to maintain a negative pressure
within the heat exchanger relative to the conditioned space.
d. Safety Devices: A high limit controller with automatic reset to prevent the heat
exchanger from operating at an excessive temperature shall be included. A cen-
trifugal switch on the induced draft fan motor shaft shall prevent ignition until
sufficient airflow is established through the heat exchanger. A rollout switch shall
provide secondary airflow safety protection. The rollout switch shall discontinue
furnace operation if the flue becomes restricted.
e. Flue: The furnace flue shall be shipped loose to protect it from damage during
transit. The flue shall be field-mounted by the installing contractor. The flue out-
let shall be located above the unit to help prevent recycling of combustion gases
back through the heat exchanger.
f. Agency Certification: Gas heating sections are both ETL listed to both U.S.
and Canadian safety standards.
4. Electric Heat: An electric slip-in heater is installed within the single package unit
discharge plenum to provide the heating requirements per the schedule shown on
the plans. The electric heater is wired in such a manner as to provide a minimum of
two steps of capacity.
a. Heat Exchanger: The furnace is an industrial grade design using an open coil
made of the highest grade resistance wire containing 80% nickel and 20% chro-
mium. The resistance coils are adequately supported in the air stream using ce-
ramic bushings in the supporting framework. Terminals of the coil are stainless
steel with high temperature ceramic bushings.
b. Safety Devices: The primary high temperature protection is an automatic reset
type thermal cut out. Secondary protection is an automatic reset type thermal
cut out. Secondary protection is a replaceable thermal link.
c. Agency Certification: The operation of the electric heater is an integral part
of the single package units control system. Power connection to the heater is
through the power panel for the unit. Electric heat is ETL listed to both U.S. and
Canadian safety standards.
Guide Specifications (Cont'd)
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