Installation; General; Variable Air Volume Controls - 37Hs1 Unit With 23-In. Diffuser; Variable Air Volume Controls - Carrier 37HS Series Installation Instructions Manual

INSTALLATION

General —
Controls may be installed in the unit before
or after the unit is hung or placed in the ceiling grid. How-
ever, if warm-up switches or changeover valves are used,
the controls should be installed before the unit is placed in
the ceiling structure.
VARIABLE AIR VOLUME CONTROLS — 37HS1 UNIT
WITH 23-in. DIFFUSER
From the universal control package, select the following com-
ponents (See Fig.2):
• filter assembly
• pneumatic tubing, 11 ⁄ in. long
16
• volume controller
• diffuser baffle, narrow, 2
• thermostat/aspirator assembly
• rubber thermostat supply tube, with spring installed,
5 3 ⁄ in. long
8
• 3 elbow connectors
• clear plastic tube, 4 ⁄ in. long
3
8
• brass tee
• thermostat mount spring clip
Fig. 2 — Components Selected From
Universal Control Package for
Installation on 37HS1 with
23-in. Diffuser
Control Installation, 37HS1 Unit with 23-in. Diffuser
1. Remove the plugs from the high-pressure and low-
pressure ports located at the control block of the unit.
2. Remove cap from bellows fitting and install
piece of 1 ⁄ -in. OD pneumatic adapter tubing onto the
4
bellows fitting (push on full length of fitting). See Fig. 3.
3. Push the diffuser baffle into the space between side dif-
fusers and down onto the center diffuser at the end away
from the unit. Then push down the end close to the unit.
The baffle will form around the legs of the diffuser spacer
and lock onto the center diffuser. See Fig. 4. Baffle should
fill space between side diffusers between unit end and
thermostat.
4. To prepare the control filter for installation, be sure that
the bellows chamber filter plug is pushed tightly into
the correct connection. Figure 5 shows the connection
ports on both sides of the filter. The lower bellows port
on the unit side and the small bellows pressure connec-
tion on the control side should be capped or plugged
before installation.
5. Install the 3 elbow connectors to the filter. Figure 6 shows
the correct orientation of the elbows.
⁄ in. long
3
8
11 ⁄ -in. long
16
HIGH
LOW
Fig. 3 — Typical 37HS Air Terminal
Before Installation of Controls
Fig. 4 — Diffuser Baffle Assembly
Fig. 5 — Filter/Manifold Connections
Fig. 6 — Elbow Connections Installed on Filter
2
FOR
DIFFUSER
THERMOSTAT
ASPIRATOR
BELLOWS
FITTING