75
TEMPMASTER
FORM TPM3-EG1 (518)
5. Hot Water Heating Coil: A hot water coil shall be installed in the single package
unit discharge plenum.
a. Construction: The hot water coil shall have 8 [10, 12, 14] fins per inch, 2 tubes
per circuit, and an 2-inch inlet and outlet connection. Primary surface shall be
1/2-inch OD copper tube, staggered in direction of airflow. Connections have
1/4-inch FPT drain plug on each connection. A structural galvanized steel cas-
ing shall protect the coil. An intermediate coil support shall be provided. The
coil shall be circuited to provide free draining and venting through one vent and
drain. Freezestat shall be provided to prevent coil freeze-up.
b. Testing: Completed coil, including headers, connections, and return bends
shall be tested with 325 pounds compressed air underwater. Coils shall be de-
signed for operation at 250 psig design working pressure.
6. Steam Heating Coil: A steam heating coil shall be installed in the single package
unit discharge plenum.
a. Construction: The steam coil shall be constructed in the non-freeze style. The
steam coil shall have 6 fins per inch, a 2-inch inlet connection, and 1-1/2-inch
outlet connection. Tubes shall be 1-inch OD seamless copper tubing with a
minimum wall thickness of 0.035-inch and expanded into the fin collars for maxi-
mum fin-tube bond. Inner distributing tubes shall be 5/8-inch OD seamless cop-
per tubing with a minimum wall thickness of 1/4-inch. All header connections
shall be of red brass or steel with male pipe threads (MPTs) and silver braze
to headers. Casing shall be galvanized steel. The core shall be pitched in the
direction of the condensate connection for proper drainage. Freezestat shall be
provided to prevent coil freeze-up.
b. Testing: The completed coil, including headers and connections, shall be test-
ed underwater with 325 pounds compressed air to ensure a leak-free coil.
7. Diffuser Section: For applications with an extended discharge plenum with down-
stream ltration or heating, a diffuser section is provided. A diffuser shall be included
to distribute the airow from the fan evenly across the heating coil or lter bank to
optimize coil/lter life and effectiveness. The diffuser shall be sized for 50% free
area and provide adequate upstream and downstream clearance to minimize air-
side pressure drop.
[FOR EXTENDED DISCHARGE PLENUMS, SELECT ONE OF THE FOLLOWING]
1. Downstream Final Filter Rack: A 12-inch rigid lter rack and lters shall be provid-
ed downstream of the supply fan and diffuser segment for hospital applications. The
lter shall be 90–95% efcient MERV 14. A magnahelic pressure gauge shall be
included and visible from the outside of the unit for servicing and code compliance.
2. Blank Section: A blank section shall be provided downstream of the supply fan and
diffuser section.
Condenser Section
1. Condenser Fans: Condenser fans shall be matched up with compressors to op-
timize system control. Condenser fans shall be propeller type, directly driven by
permanently lubricated totally enclosed air over (TEAO) motor.
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