ENVIROMASTER INTERNATIONAL LLC
13
IMPORTANT:
As of 12/01/04 EMI air handlers will be manu-
factured with a low Volt transformer installed. At the same
time, EMI outdoor condensers will be manufactures with-
out a low Volt transformer. When connecting an EMI evapo-
rator to a non-EMI condenser, check to ensure that there is a
24V control transformer in either in the indoor unit or outdoor
unit. Only one transformer is required. If a transformer is not
present then one should be added to the indoor unit. If both
the indoor unit and outdoor unit contain a transformer, one
must be remover from the system.
CONTROL CIRCUIT CHECKS
(Chilled Water Units)
A thorough pipe work check and pressure test should be
performed before the Cassette controls are set up.
1. Isolate the Cassette from the chilled water supply.
A system electrical check can now be carried out.
2. Switch on the indoor Cassette unit and check that
the fan cycles correctly.
NOTE: In some models there is a two minute fan run on
time to remove residual heat from the Cassette, if the unit is
switched off during the heating mode.
3. On models with microprocessor controls, check
that the High, Medium and Low fan speeds are op-
erating correctly by changing the fan speed via the
transmitter.
4. On models 15-48, check that the motorized vane
sweep functions correctly by toggling the function
on or off, either via the transmitter (micro units) or
via the toggle switch on the back of the electrical
panel lid (electro-mechanical units).
5. On micro controlled units, if required, check that
the built-in timer function is programmed and oper-
ating correctly. When the timer is activated, the
red LED on the fascia display panel should be lit.
6. Check the operation of the condensate pump by
pouring 7-8 ounces of water down the pump outlet,
switch the unit on, select cooling mode and the
lowest possible temperature setpoint then observe
the water being pumped from the Cassette.
7. Allow chilled water to enter the Cassette and vent
air from the unit by opening the 1/4" air bleed. Re-
tighten the bleed screw once all air has been re-
moved.
8. Repeat steps 1-4 above for all Cassettes in the
same systems.
The Cassettes are now ready for the system balance to be
performed.
UNIT START UP - INDOOR UNIT
CONTROL CIRCUIT CHECKS (DX Units)
NOTE:
Apply power to the Condensing Unit’s crankcase
heater for 24 hours before start up to boil off any liquid that
may be present in the compressor.
1. After 24 hours, the compressor should be isolated
by removing the connection at the “Y” terminal on
the outdoor unit. Main power can now be applied to
the indoor and outdoor units. A system electrical
check can now be carried out.
2. Switch on the indoor Cassette unit and check that
the fan cycles correctly.
NOTE: In some models there is a two minute fan
run on time to remove residual heat from the Cas-
sette, if the unit is switched off during the heating
mode.
3. On models with microprocessor controls, check
that the High, Medium and Low fan speeds are op-
erating correctly by changing the fan speed via the
transmitter.
4. On models 15-48, check that the motorized vane
sweep functions correctly by toggling the function
on or off, either via the transmitter (micro units) or
via the toggle switch on the back of the electrical
panel lid (electro-mechanical units).
5. On micro controlled units, if required, check that
the built-in timer function is programmed and oper-
ating correctly. When the timer is activated, the
red LED on the fascia display panel should be lit.
6. Check the operation of the condensate pump by
pouring 7-8 ounces of water down the pump outlet,
switch the unit on, select cooling mode and the
lowest possible temperature setpoint then observe
the water being pumped from the Cassette.
7. Where fitted, check the operation of the hot water
valve or the electric heat elements by switching
the system to the heating mode and selecting the
highest possible temperature setpoint.
8. Ensure that the Condensing Unit start up proce-
dure has been carried out as detailed in the corre-
sponding installation manual.
9. The compressor signal “Y” (disconnected from the
outdoor unit in step 1) can now be reconnected
and main power applied to the system.
