Balancing Procedure (Control Sequences 1102 And 1103); Direct Acting Thermostat, Normally Open Damper (Control Sequence 1102); Reverse Acting Thermostat, Normally Closed Damper (Control Sequence 1103); 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. 9.
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 pro-
vided on the side of the VAV unit and in Fig. 7.
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 volume
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 controller) until
the desired pressure differential is registered on the
manometer. To determine the required pressure dif-
ferential, refer to Table 5 and the Linear Probe CFM
vs Pressure Signal Graph provided on the side of the
VAV unit and in Fig. 7.
d. Reconnect the thermostat line.
REVERSE ACTING THERMOSTAT,
CLOSED DAMPER (CONTROL SEQUENCE 1103)
Refer to Fig. 10.
1. Maximum volume setting:
a. Disconnect the thermostat line from the volume
controller.
b. Adjust the maximum volume control knob (marked
"HI" and located in the center of the controller) 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. 7.
d. Reconnect the thermostat line.
2. Minimum volume setting:
a. Disconnect the thermostat line from the volume
controller.
b. Apply 15 + psi to the thermostat port on the volume
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 controller) until
the desired pressure differential is registered on the
manometer. To determine the required pressure dif-
ferential, refer to Table 5 and the Linear Averaging
Probe Chart provided on the side of the VAV unit
and in Fig. 7.
d. Reconnect the thermostat line.
Balancing
1104-1110)
1.
NOTE: Accuracy in the alignment of the arrows is very import-
ant. Make this adjustment as exact as possible. (See Fig. 12.)
2.
The controller can be set up for cooling or heating applica-
tions using either a Direct Acting (DA) or Reverse Acting
(RA) thermostat signal. The two flow adjustments are labeled
"LO STAT P" and "HI STAT P."
* TO STATIC PRESSURE
TO TOTAL PRESSURE
*(DIFFERENCE IS: DIFFERENTIAL
PRESSURE, OR DEVICE
VELOCITY PRESSURE)
PUSH ON NIPPLES
FOR 3/16" (5) I.D.
FR TUBING (5)
TO DAMPER
ACTUATOR
TO MAIN AIR
SUPPLY
LOOSEN SCREW TO
CHANGE DAMPER ACTION
(SUPPLIED IN N.O. POSITION)
GAGE TAP. LEAVE CAP ON UNLESS
NORMALLY
CONNECTING GAGE FOR RESET
START OR RESET SPAN ADJUSTMENT
LO STAT P setting is the desired airflow limit when the
thermostat pressure is less than, or equal to, the reset start
point.
•
•
HI STAT P setting is the desired airflow limit when the
thermostat 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.
•
•
12
Procedure
Damper action is factory set at N.O. (normally open), or
N.C. (normally closed). To change, perform the follow-
ing steps:
a. Loosen the damper selection screw.
b. Turn the selection dial clockwise until the "NC" or
"NO" arrow aligns with the "DAMPER" arrow.
Pipe the controller: Connect port "B" to the damper actu-
ator. Connect port "M" to the clean, dry main air. Con-
nect 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.
TO THERMOSTAT BRANCH SIGNAL
(RESET SIGNAL)
RESET START POINT ADJUSTMENT
(FACTORY SET AT 8 PSI)
T
H L
RESET START
B
LO STAT ΔP
HI STAT ΔP
NO
M
RESET SPAN
D A M P E R
G
DAMPER ACTION SELECTION
(FACTORY SET AT NORMALLY OPEN)
NOTE: SCREW MUST BE TIGHT AND ARROWS
IN PERFECT ALIGNMENT FOR DEVICE TO FUNCTION PROPERLY.
Fig. 12 — 3011 CSC Controller
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.
For DA Cooling or RA Heating (see Fig. 13):
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. 13):
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.
(Control Sequences
DIFFERENTIAL PRESSURE (FLOW)
LIMIT ADJUSTMENT WHEN T'STAT
PRESSURE IS HIGH (HI STAT)
(FACTORY SET AT 0.65 IN.WG.)**
**- FIELD ADJUSTMENT REQUIRED
DIFFERENTIAL PRESSURE (FLOW)
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)