Balancing Procedure (Control Sequences 1102 And 1103); Direct Acting Thermostat; Reverse Acting Thermostat, Normally; Balancing Procedure (Control Sequences 1104-1110) - Carrier 35E Installation And Start-Up Instructions Manual

Balancing Procedure (Control Sequences
1102 and 1103)
DIRECT ACTING THERMOSTAT, NORMALLY OPEN
DAMPER (CONTROL SEQUENCE 1102) — Refer to Fig.
8.
1. Minimum volume setting:
a. Disconnect the thermostat line from the volume
controller.
b. Adjust the minimum volume control knob
(marked "LO" and located in the center of the
controller) to achieve the required minimum flow.
To determine the required pressure differential,
refer to Tables 2 and 5 and the Linear Averaging
Probe Chart provided on the side of the VAV unit
and in Fig. 6.
c. Reconnect the thermostat line.
2. Maximum volume setting:
a. Disconnect the thermostat line from the volume
controller.
b. Apply 15 + psi to the thermostat port on the vol-
ume controller (marked "T") by tapping into the
main air pressure line.
c. Adjust the maximum volume control knob
(marked "HI" and located at the side of the con-
troller) until the desired pressure differential is
registered on the manometer. To determine the
required pressure differential, refer to Table 5 and
the Linear Probe CFM vs Pressure Signal Graph
provided on the side of the VAV unit and in Fig. 6.
d. Reconnect the thermostat line.
REVERSE ACTING THERMOSTAT, NORMALLY CLOSED
DAMPER (CONTROL SEQUENCE 1103) — Refer to Fig. 9.
1. Maximum volume setting:
a. Disconnect the thermostat line from the velocity
controller.
b. Adjust the maximum volume control knob
(marked "HI" and located in the center of the con-
troller) to achieve the required minimum flow.
c. To determine the required pressure differential,
refer to Tables 2 and 5 and the Linear Averaging
Probe Chart provided on the side of the VAV unit
and in Fig. 6.
d. Reconnect the thermostat line.
2. Minimum volume setting:
a. Disconnect the thermostat line from the velocity
controller.
b. Apply 15 + psi to the thermostat port on the vol-
ume controller (marked "T") by tapping into the
main air pressure line.
c. Adjust the minimum volume control knob
(marked "LO" and located at the side of the con-
troller) until the desired pressure differential is
registered on the manometer. To determine the
required pressure differential, refer to Table 5 and
the Linear Averaging Probe Chart provided on the
side of the VAV unit and in Fig. 6.
d. Reconnect the thermostat line.
Balancing Procedure (Control Sequences
1104-1110)
1. Damper action is factory set at N.O. (normally open), or
N.C. (normally closed). To change, perform the following
steps:
a. Loosen the damper selection screw.
b. Turn the selection dial clockwise until the "NC" or
"NO" arrow aligns with the "DAMPER" arrow.
NOTE: Accuracy in the alignment of the arrows is very im-
portant. Make this adjustment as exact as possible. (See Fig.
11.)
2. Pipe the controller: Connect port "B" to the damper actu-
ator. Connect port "M" to the clean, dry main air. Connect
port "T" to the thermostat output. Connect port "H" to the
total pressure tap on the airflow sensor. Connect port "L"
to the static pressure tap on the airflow sensor.
The controller can be set up for cooling or heating applications
using either a Direct Acting (DA) or Reverse Acting (RA) ther-
mostat signal. The two flow adjustments are labeled "LO STAT
P" and "HI STAT P."
TO THERMOSTAT BRANCH SIGNAL
(RESET SIGNAL)
RESET START POINT ADJUSTMENT
(FACTORY SET AT 8 PSI)
* TO STATIC PRESSURE
TO TOTAL PRESSURE
*(DIFFERENCE IS: DIFFERENTIAL
PRESSURE, OR DEVICE
VELOCITY PRESSURE)
PUSH ON NIPPLES
FOR 3/16" (5) I.D.
H
FR TUBING (5)
B
TO DAMPER
ACTUATOR
TO MAIN AIR
NO
SUPPLY
M
D A M P E R
LOOSEN SCREW TO
CHANGE DAMPER ACTION
G
(SUPPLIED IN N.O. POSITION)
GAGE TAP. LEAVE CAP ON UNLESS
CONNECTING GAGE FOR RESET
START OR RESET SPAN ADJUSTMENT
DAMPER ACTION SELECTION
(FACTORY SET AT NORMALLY OPEN)
NOTE: SCREW MUST BE TIGHT AND ARROWS
IN PERFECT ALIGNMENT FOR DEVICE TO FUNCTION PROPERLY.
Fig. 11 — 3011 CSC Controller
LO STAT P setting is the desired airflow limit when the ther-
mostat pressure is less than, or equal to, the reset start point.
• For DA Cooling or RA Heating:
Adjust LO STAT P to the desired minimum airflow
with 0 psig (or a pressure less than the reset start point)
at port "T." The LO STAT P must be set first. The LO
STAT P will affect the HI STAT P setting.
• For RA Cooling or DA Heating:
Adjust LO STAT P to the desired maximum airflow
with 0 psig (or a pressure less than the reset start point)
at port "T." The LO STAT P must be set first. The LO
STAT P will affect the HI STAT P setting.
HI STAT P setting is the desired airflow limit when the ther-
mostat pressure is greater than, or equal to, the reset stop-point.
The reset stop-point is the reset span pressure added to the reset
start-point pressure.
• For DA Cooling or RA Heating (see Fig. 12):
Adjust HI STAT P to the desired maximum airflow with
20 psig (or a pressure greater than the reset stop point) at
port "T." The HI STAT P must be set last. The HI STAT
P setting will be affected by the LO STAT P setting.
• For RA Cooling or DA Heating (see Fig. 12):
Adjust HI STAT P to the desired minimum airflow
with 20 psig (or a pressure greater than the reset stop
point) at port "T." The HI STAT P must be set last. The
HI STAT P setting will be affected by the LO STAT P
setting.
11
T
DIFFERENTIAL PRESSURE (FLOW)
L
LIMIT ADJUSTMENT WHEN T'STAT
RESET START
PRESSURE IS HIGH (HI STAT)
LO STAT ΔP
(FACTORY SET AT 0.65 IN.WG.)**
**- FIELD ADJUSTMENT REQUIRED
HI STAT ΔP
DIFFERENTIAL PRESSURE (FLOW)
RESET SPAN
LIMIT ADJUSTMENT WHEN T'STAT
PRESSURE IS LOW (LO STAT)
(FACTORY SET AT 0 IN.WG.)**
ALL ADJUSTMENTS CCW TO INCREASE
(1/8"-5/32" FLATBLADE SCREWDRIVER)
RESET SPAN ADJUSTMENT
(FACTORY SET AT 5 PSI)