acutherm STR-HC/ STR-C Therma Fuser Specification
- June 8, 2024
- acutherm
Table of Contents
Models: STR-HC Separate set points for VAV heating and VAV cooling
STR-C Separate set point for VAV cooling only
GUIDE SPECIFICATION
(Suitable for Section 23 36 16 Variable-Air-Volume Units of the CSI Master
Format) Material in italics applies only to model STR-HC. Delete the italics
for model STR-C.
2.2 Thermally Powered VAV Diffusers
A. Thermally powered variable air volume diffusers shall be Therma-Fuser™
model STR manufactured by Acutherm, Hayward CA.
B. Thermally powered VAV diffusers shall be a complete VAV terminal and
thermostat self-contained in nominal 24″/600mm diameter round diffuser. They
shall be thermally powered with one room thermostat/actuator and one
changeover thermostat/actuator. External wiring or pneumatics shall not be
allowed.
C. The VAV diffusers shall have a thumbwheel and temperature scale to
adjust the cooling set point and a separate thumbwheel and temperature scale
for the heating set point. The adjustment shall be right above the hinged
appearance panel and shall not require tools. Each set point shall be
separately adjustable between 70°F/21°C and 78°F/26°C. The initial set point
shall be factory set at 74°F/23°C..
D. In the cooling mode the VAV diffusers shall open on a rise in room
temperature and in the heating mode they shall close on a rise in room
temperature. The changeover thermostat shall be factory installed and adjusted
to engage the heating mode when the supply air temperature rises above
80°F/27°C and return to the cooling mode when the supply air temperature falls
below 68°F/20°C. During changeover the diffuser shall close or, if a minimum
flow is set, go to the minimum. Nothing including the changeover mechanism
shall extend above the inlet of the diffuser.
E. All VAV diffusers shall have a dial and scale to adjust minimum flow
between 5 cfm/2.4 l/s and 50% of maximum flow without tools. Minimum flow
shall be factory set at 10%. A fixed maximum flow stop shall be factory set
for the full open air flow of the specified inlet size.
F. All VAV diffusers shall have a lever which will open the damper for
balancing without tools. The balancing lever shall be accessible from the
outside of the diffuser without folding down the appearance panel or removing
any part of the diffuser.
G. All VAV diffusers shall have a solid (no holes or slots), hinged
appearance panel that can be unlatched and folded down to hang allowing hands
to be free for adjusting temperature set points. Instructions for the VAV
diffuser shall be on the inside of the appearance panel.
H. The VAV diffusers shall have positive induction of secondary room air
over the room thermostat/actuator at all flows from fully closed to fully
open.
I. The manufacturer shall warrant that all VAV diffusers shall be free
from defects in materials and workmanship for a period of ten years from date
of shipment.
J. Supply air to the VAV diffuser shall be constant temperature (may be
reset to another constant temperature). Supply air shall be limited to no
lower than 50°F/10°C on cooling and no higher than 120°F/49°C on heating. The
heating high limit shall be as low as possible but no lower than 80°F/27°C.
Acutherm ● 1766 Sabre Street ● Hayward CA 94545 ● +1 510 785 0510 ● Fax +1 510 785 2517 Website: http//www.acutherm.com ● email: info@acutherm.com
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