SA-Series Technical Manual
17
Cambridge Air Solutions
3. Turn the burner service switch to the “LOCAL”
position. After a delay for prepurge and igniter warm-
up, the burner will light. Allow 15 seconds for the
low fire start to time out.
CAUTION:
Do not allow leak detector solution to come in
contact with electrical components.
4. With the burner operating, spray the complete gas
train with leak detector solution, checking all pipe
connections and plugs.
WARNING:
Any gas leak detected must be repaired before unit
is placed into service.
5. Turn the blower and burner service switches to the
“OFF” position.
6. Reconnect the wire to terminal #3 on the amplifier
7. When performing start-up proceed to next step,
otherwise perform Final Heater Preparation (page
17).
REMOTE CONTROL CHECK
1. If the ambient temperature is at or above the
Entering Air Thermostat (EAT) setpoint, note the
setpoint position. Pull the jumper off the temperature
setpoint (Normal Mode) and reinstall it sideways on
the terminal block (Bypass Mode) as shown below.
Refer to the Individual Component Description
section for additional information.
2. Turn the blower and burner service switches to the
“REMOTE” position.
3. On the thermostat, activate a call for heat by raising
the heat temperature set point to the highest possible
value.
4. After a short delay for damper (optional) operation,
the blower should operate, followed by burner
ignition after a delay for pre-purge and igniter warm-
up.
5. Reset the thermostat to the desired space temperature.
6. Reinstall jumper to (Normal Mode).
7. Service switches should be in "REMOTE".
FINAL HEATER PREPARATION
1. Perform visual inspection of all wiring and gas valve
plugs to ensure they have been properly replaced.
2. Remove all test instrumentation.
3. Replace and fasten all covers and panels. Close the
control enclosure and latch the door.
4. Turn on the disconnect switch (by others).
IMPORTANT
If technical assistance is needed, call the Cambridge
Customer Service Group at 1-800-473-4569 during the
hours of 8:00 a.m. to 5:00 p.m. Central Time, Monday
through Friday.
SHUTDOWN INSTRUCTIONS
1. Turn mode selector switch to “OFF” position.
CALIBRATION PROCEDURE
1. Remove the two mounting screws from the Maxitrol
A1044 Amplifier located in the Electrical Control
Enclosure. Refer to the Electrical Control Enclosure
Isometric Drawing (page 35) for additional
information.
2. Turn the amplifier over and adjust the amplifier
calibration potentiometer shown in the drawing.
To raise the discharge temperature, use a Phillips
screwdriver to adjust the potentiometer counter
clockwise. To lower the discharge temperature, adjust
the potentiometer clockwise.
3. Wait for the discharge temperature and manifold
pressure to stabilize after making adjustments. Do not
rush this step.
4. In rare cases, the amplifier calibration potentiometer
will reach its adjustment limit before the proper
discharge temperature is achieved. If this occurs, the
Discharge Temperature Sensor (DTS) will need to be
adjusted:
