
Guide Specification for RTU-1
Project: ~Untitled65 05/30/2014
Prepared By: 10:46AM
L. Special Features:
1. Coil Options:
Base unit with tin plated indoor coil hairpins available as a factory installed option.
2. Compressor Start Kit (single phase units only):
Shall provide additional starting torque for single-phase compressors.
3. Thermostat:
To provide for one-stage heating and cooling in addition manual or automatic changeover and indoor fan
control.
4. Crankcase Heater:
Shall provide anti-flood back protection for low-load cooling applications.
5. Economizer:
Economizer controls capable of providing free cooling using outside air.a.
Equipped with low leakage dampers not to exceed 3% leakage, at 1.0 IN. W.C. pressure differential. b.
Spring return motor shuts off outdoor damper on power failure.c.
6. Electric Heaters:
Electric heater shall be available as a field--installed option.a.
Heater elements shall be open wire type, adequately supported and insulated with ceramic bushings.b.
Electric heater packages must provide single point power connection capability.c.
7. Filter Rack Kit:
Shall provide filter mounting for downflow applications.
8. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for flashing and shall be installed per manufacturer’s
instructions.
9. Low Ambient Package:
Shall consist of a solid--state control and condenser coil temperature sensor for controlling condenser--
fan motor operation, which shall allow unit to operate down to 0_F (-17_C) outdoor ambient
temperature when properly installed.
10. Louvered Grille:
Wire grille shall be standard on all units. Louvered grille shall be available as a field--installed option to
provide hail guard and vandalism protection.
11. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and rainhood which can be preset to admit outdoor air for
year--round ventilation.
12. Square--To--Round Duct Transitions (24-48 size):
Shall have the ability to convert the supply and return openings from rectangular to round.
13. Time Guard II
Automatically prevents the compressor from restarting for at least 4 minutes and 45 seconds after
shutdown of the compressor. Not required when a corporate programmable thermostat is applied or with
a RTU--MP control.
Packaged Rooftop Builder 1.39i Page 8 of 8
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