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NOTE:
Use UL- -listed conduit and conduit connector for
connecting supply wire(s) to unit to obtain proper grounding.
Grounding may also be accomplished by using grounding lugs
provided in control box.
E. Minimum CFM and Motor Speed Selection
Units with or without electric heaters require a minimum CFM.
Refer to the unit wiring label to ensure that the fan speed selected is
not lower than the minimum fan speed indicated. Fan speed
selection for sizes 018, 024, 030, 036, 042, 048 and 060 is done at
the fan relay printed- -circuit board. To change motor speeds,
disconnect fan lead used on relay terminal (SPT) and replace with
motor speed tap desired. (See Fig. 17.) Save insulating cap and
place on motor lead removed from relay.
PCB
FAN RELAY
SINGLE SPADE
INSULATING CAP (2)
MOTOR SPEED
TAP LEADS
COMMON YELLOW
Fig. 17 - - Fan Coil Relay and Speed Tap Terminal for Sizes
018, 024, 030, 036, 042, 048 and 060
NOTE: In low static applications, lower motor speed tap should
be used to reduce possibility of water being blown off coil. Sizes
018 through 036 have 2 motor speed taps. Sizes 042, 048 and 060
have 3 motor speed taps. Low speed (red) is designed for
mismatched outdoor unit applications. Medium speed (blue) is
designed for straight matched operations. High speed (black) is
used with high external static duct systems of straight matched
systems.
The fan speed selection on the 019, 025, 031, 037, 043, 049, and
061 models is done at the motor. (See Fig. 18.) To change motor
speeds, disconnect fan lead from terminal 2 and move to desired
speed tap; low speed (one), medium (two), and high (three).
1 2 3 4 5
Fig. 18 - - Motor Speed Selection
SPEED TAP
TERMINAL
WRAPPER
FAN DECK
A97529
A09390
Step 5 — Refrigerant Tubing Connection and
Evacuation
Use accessory tubing package or field- -supplied tubing of
refrigerant grade. Suction tube must be insulated. Do not use
damaged, dirty, or contaminated tubing because it may plug
refrigerant flow- -control device. ALWAYS evacuate the coil and
field- -supplied tubing to 500 microns before opening outdoor unit
service valves.
CAUTION
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or property
damage.
A brazing shield MUST be used when tubing sets are being
brazed to the unit connections to prevent damage to the unit
surface and condensate pan fitting caps.
Units have sweat suction and liquid tube connections. Make
suction tube connection first.
1. Cut tubing to correct length.
2. Insert tube into sweat connection on unit until it bottoms.
3. Braze connection using silver bearing or non- -silver bearing
brazing materials. Do not use solder (materials which melt
below 800_F / 427_C). Consult local code requirements.
4. Evacuate coil and tubing system to 500 microns using deep
vacuum method.
CAUTION
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or property
damage.
Wrap a wet cloth around rear of fitting to prevent damage to
TXV and factory- -made joints.
Step 6 — Refrigerant Flow- -Control Device
The PF4MNA fan coil is equipped with R- -410A refrigerant TXV.
Use outdoor units designed for R- -410A refrigerant only.
CAUTION
!
PRODUCT OPERATION HAZARD
Failure to follow this caution may result in improper product
operation.
If using a TXV in conjunction with a single- -phase reciprocating
compressor, a compressor start capacitor and relay are required.
Consult outdoor unit pre- -sale literature for start assist kit part
number.
Step 7 — Condensate Drains
To connect drains, the cap openings must be removed. Use a knife
to start the opening near the tab and using pliers, pull the tab to
remove the disk. Clean the edge of the opening if necessary and
install the condensate line. Finally caulk around the lines where
they exit the fitting to retain the low leak rating of the unit.
7
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