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Bypass Weathermaster® Air Terminals
INTRODUCTION
The 36TE unit (see Fig. 1) is a nonchangeover version of the 36RV Bypass WEATHERMASTER Air Terminal with an electriciresistance heater. It consists of an air inlet, sound absorbing plenum, balancing damper, primary air nozzles, bypass damp er assembly, secondary coil, and condensate pan.
Controls for this unit are either self-contained or wall mounted: the thermostat can be mounted on the right-hand side of the unit or on the wall; the electrical controls are mounted on the lefthand side of the unit. Electrical controls include an On-Off toggle switch, fuse holder, fuse, micro switch, terminal block, automatic high-temperature Umit switch, and a manual reset temperature limit switch.
When the unit thermostat senses a cold room temperature, it causes the bypass damper to close. Induced room air is then directed around the secondary coil. When the damper reaches its full bypass position, it contacts the microswitch which activates the heater.
This publication is designed as a supplement to the 36R Installation Instructions. Since the 36RV and 36TE units are similar, installation of the 36TE unit is the same as that described for the 36RV unit with the changes noted in this pubhcation. Refer also to the 36R literature for unit and enclosure dimensional data.
When unpacking unit, should any in-transit damage be observed, file claim with transportation agency.
INSTALLATION
Unit Installation
1. Follow procedures outlined for installation of the 36RV air terminals. Refer to 36R Installa tion Instructions for details.
2. Do not remove protective cover from unit discharge unless discharge grille is being in stalled. If construction debris is still present in area, keep discharge covered to prevent debris from getting into unit heater.
Wiring
1.Observe national and local codes.
2.Check to ensure that unit nameplate voltage corresponds with the line voltage available at the job site. Do not exceed the allowable voltage variation of ± 10 percent.
3.Make line voltage connections to terminal block in control box on unit. Make ground connec tion to green screw above terminal block. (See
Fig. 1 and Fig. 2.)
THERMOSTAT
ELECTRIC RESISTANCE
HEATER
DAMPER ADJUSTMENT
SCREW (SEE FIG 3)
MANUAL RESET
TEMPERATURE
LIMIT SWITCH
ELECTRICAL
CONTROL BOX
{COVER FUSE REMOVED
MICROSWITCH
ON-OFF
TOGGLE SWITCH
GROUND (CONNECTION)
TERMINAL BLOCK
CONDENSATE PAN
Fig. 1 -36TE Bypass WEATHERMASTER
Air Terminal
4. Refer to Table 1 for electrical data and usage.
NOTE: Whenever the fan in the central station air handling apparatus is shut down, make sure that the electric resistance heater located in the 36TE unit discharge is inoperative To ensure this, the heater circuit should be interlocked with the apparatus fan.
Unit Balancing
1. Remove construction debris from unit and make sure that protective plastic has been removed from thermostat cover.
2. Units are shipped with plenum damper wide open. Turn damper adjustment screw, which is located in the front of the unit (see Fig. 1 and Fig. 3), clockwise to close damper and decrease nozzle pressure to design value. (Minimum allowable nozzle pressure is 1.0 in. wg.) Two or three runs may be necessary to obtain proper balance. (See Fig. 3.)
NOTE: 36TE unit requires minimum 1.5 in. wg plenum pressure for control operation; maxi mum allowable plenum pressure is 5 in. wg.
©Carrier Corporation 1972 |
Form 36TE-1SI |
Fig. 2 — 36TE Bypass Weathermaster® Air Terminal Wiring Schematics
Table 1 - Electrical Data and Usage
VOLTAGE/HZ |
WATTS |
FLA |
FUSE |
WIRE |
ALLOWABLE |
|
SIZE |
||||||
AMPS |
AMP-FT* |
|||||
|
|
|
(AWG) |
|||
|
1000 |
4.81 |
|
14 |
332 |
|
208-1-60 |
1500 |
7 22 |
|
12 |
527 |
|
2000 |
9.63 : |
15 0 |
10 |
834 |
||
|
2500 |
12.10 |
|
8 |
1328 |
|
|
3000 |
14.41 |
|
p. 6 |
2061 |
|
|
1000 |
4.17 |
|
|
383 |
|
240-1-60 |
1500 |
6.25 |
|
12 |
609 |
|
2000 |
8.33 |
15.0 |
10 |
962 |
||
|
2500 |
10.40 |
|
8 |
1533 |
|
|
3000 |
12.50 |
|
6 |
2378 |
|
|
1000 |
3.62 |
|
14 |
442 |
|
277-1-60 |
1500 |
5.42 |
|
12 |
702 |
|
2000 |
7 23 |
15 0 |
10 |
nil |
||
|
2500 |
9.03 |
|
8 |
1769 |
|
|
3000 |
10.85 |
|
6 |
2745 |
FLA — Full Load Amps
MEASURING NOZZLE PRESSURE
*Copper |
wire |
sizes |
based upon |
60 C |
Use |
latest |
National Electric |
|
Code |
(NEC) |
for |
wire |
lengths |
(allow 3% voltage drop) and fuse |
|||
sizes |
Follow |
all |
local |
codes |
required. |
To |
obtain |
maximum wire |
length, divide allowable amp—feet by FLA
MEASURING PLENUM PRESSURE
NOTE Unit must not be operated below a 1-in. wg nozzle pres.- sure and a 1 5-in. wg plenum pressure
Fig. 3 — Measuring Nozzle and Plenum Pressures
3. Total primary air flow to a series of units fed by a common runout should not exceed 220 cfm.
iMK>RTANTt Unit ttoi be operated
With iese ptxxm^y thsm sbowjr below:
_ _
|
ja |
IbCC |
fif |
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6; |
2&X! |
33 |
JOOO |
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Enclosure Selection
Standard 36RV enclosures with stamped steel discharge grilles can be used with the 36TE units. Plastic grilles must never be used. The steel grille should be locked in place after installation. On furred-in units, a discharge grille frame may be used with the discharge grille.
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