Carrier Moduline 37HS Series Installation, Start-Up And Service Instructions Manual page 22

CONTROL INSTALLATION — Controls may be installed
in the unit before or after the unit is hung or placed in the
ceiling grid. However, if warm-up switches or changeover
valves are used, the controls should be installed before the
unit is placed in the ceiling structure.
Refer to Table 3 for control packages and accessory
identification.
Constant Volume Applications
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 (see Fig. 28) and install
11 ⁄ -in. piece of 1 ⁄ -in. OD pneumatic tubing onto the bel-
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lows fitting (push on full length of fitting).
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. 29.
4. To prepare the control filter for installation, be sure that
the bellows chamber filter plug is pushed tightly into the
correct connection. Figure 30 shows the connection ports
on both sides of the filter. The lower bellows port on the
unit side and the small slave bellows pressure connection
on the control side should be capped or plugged before
installation. Moisten the 2 O-rings with water, then push
the filter into the unit end block until the standoffs rest on
or close to the unit end plate. See Fig. 31.
5. Remove cap from thermostat port of volume controller.
See Fig. 32. Pull shim down until released from thermo-
stat port and then pull shim out from volume controller
body. See Fig. 33. Discard shim. Reinstall cap on the ther-
mostat port.
6. To complete installation, moisten the O-rings of the vol-
ume controller with water and push the volume control-
ler directly into the control filter. See Fig. 34 and 35.
NOTE: The thermostat port of the volume controller must
be capped.
7. If more than one unit is being controlled by a single vol-
ume controller, attach interconnecting tubing as follows
(refer to Fig. 26, page 16):
a. Use 1 ⁄ -in. OD FR tubing. Connect tubing to the unit
4
bellows connection on the end of the master unit op-
posite the control end. Do not connect tubing to filter
bellows connection.
b. Using T-tap arrangement, connect the tubing from the
master unit to the 2 slave units on each side of the
master unit.
c. Attach interconnecting tubing from these 2 slave units
to other slave units in the air series.
HIGH
LOW
Fig. 28 — Typical 37HS Air Terminal
Before Installation of Controls
HIGH-PRESSURE
PORT
FOR
DIFFUSER
THERMOSTAT
ASPIRATOR
BELLOWS
FITTING
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Fig. 29 — Diffuser Baffle Assembly
Fig. 30 — Filter/Manifold Connections
Fig. 31 — Control Filter Installed