19
FIGURE 2.27: SIDE BRANCH
Spacepak Air
Handler
7” RND w/70% of Total Outlets
A & B
F G
E
9” RND
7”
R
N
D
w
/3
0%
o
f T
ot
al
O
ut
le
ts
C & D
A: Minimum distance from the air handler outlet to first tee or elbow is 18”
B: No outlets in the first 18” of straight pipe off of the air handler
C: Minimum distance of straight pipe a!er any tee or elbow is 18”
D: Minimum distance when placing outlet a!er any tee or elbow is 18”
E: Minimum distance between outlets is 6” on center
F: Minimum distance when placing an outlet from the end cap is 12”
G: Never place an outlet in the end cap
9” Tee
DESIGN RULES FOR RETRO-
FITTING “B&C” SERIES SPACEPAK
EQUIPMENT TO NEWER
(D,E,F,G,J) SERIES EQUIPMENT
SECTION 3: START-UP & OPERATION
SEQUENCE OF OPERATION
When power is turned on and thermostat fan switch is
set to ON and the cooling indicator is set to OFF, the
indoor fan motor is energized through the normally open
contact FR-1 of the FR fan relay in about 30 seconds.
The outdoor unit is off.
When power is turned on and thermostat fan switch is
set to ON or AUTO and the cooling indicator to COOL
the indoor and outdoor units will start through the
normally open contacts FR-1 and FR-2 of the FR fan
relay.
The fan coil unit is equipped with a primary float switch,
the outdoor unit will automatically shut down if the drain
pan is full of water (condensate) and not draining. The
fan coil unit will continue to operate, when the water level in
the drain pan drops, the system will continue normal
operation.
PRIOR TO START-UP
1. Check all electrical connections for tightness.
2. Check air filter has been installed in return air box or
filter box.
3. Remove all winter supply shut-offs and store them in
a safe place.
SYSTEM START-UP & ADJUSTMENTS
1. Place thermostat fan switch in ON position and cool-
ing indicator in OFF position. In about 2 minutes,
indoor unit blower will start.
2. Check blower operation for excess noise or vibration.
3. Check entire distribution system for leakage and apply
additional tape where necessary.
4. Measure/adjust blower voltage/speeds
a. Remove the control box cover located on the side
of the unit.
b. With the unit powered and operating from a
conventional thermostat, ensure there is no conditioning
call (Thermostat is satisfied) and switch the fan
control to “Manual” or “On” to create a G call.
NOTE: IF NO AIRFLOW DURING W OR Y CALL,
POTENTIOMETER MAY BE IN “OFF” POSITION.
TURN CW TO ACHIEVE AIRFLOW
c. Place the ground/neutral probe in the lower right hole
marked “COM” and the volt probe in the hole marked
“Flo0” (for fan only, G call) and measure DC volts between
0 and 5V. Adjust the potentiometer adjacent to the “Flo0”
to achieve the desired volt reading. Repeat for remaining
adjustments marked Flo1 through Flo4 as indicated on
the label inside the cover. (Refer to Figure 3)
